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Score: 35.00 |
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| Title: The Mt .
Diwata study on the Philippines 1999--assessing mercury intoxication of the population by small scale gold mining .
| | Author: Drasch G Bse-OReilly S Beinhoff C Roider G Maydl S | | Journal: Sci .
Total Environ .
Citation: V : 267 ( 1-3 ) P : 151-68 Year: 2001 Type: ARTICLE | | Literature: oryza Field: abstract Doc ID: pub11286210 Accession (PMID): 11286210 | | Abstract: The region of Diwalwal , dominated by Mt .
Diwata , is a gold rush area on Mindanao ( Philippines ) where approximately 15000 people live .
The fertile plain of Monkayo is situated downstream , where people grow crops such as rice and bananas ; locally caught fish is eaten frequently .
The ore is dug in small-scale mines and ground to a powder by ball-mills while still in Diwalwal The gold is then extracted by adding liquid mercury ( Hg ) , forming gold-amalgam .
To separate the gold from the Hg , in most cases the amalgam is simply heated in the open by blow-torches .
A high external Hg burden of the local population must be assumed .
To evaluate the internal Hg burden of the population and the extent of possible negative health effects , 323 volunteers from Mt .
Diwalwal , Monkayo and a control group from Davao were examined by a questionnaire , neurological examination and neuro-psychological testing .
Blood , urine and hair samples were taken from each participant and analyzed for total Hg .
A statistical evaluation was possible for 102 workers ( occupationally Hg burdened ball-millers and amalgam-smelters ) , 63 other inhabitants from Mt .
Diwata ( only exposed from the environment ) , 100 persons , living downstream in Monkayo , and 42 inhabitants of Davao ( serving as controls ) .
The large volume of data was reduced to yes/no decisions .
Alcohol as a possible bias factor was excluded ( level of alcohol consumption and type , see Section 4 . 4 ) .
Each factor with a statistically significant difference of at least one exposed group to the control group was included in a medical score ( 0-21 points ) .
In each of the exposed groups this score was significantly worse than in the control group ( median control , 3 ; downstream , 9 ; Mt .
Diwata , non-occupational exposed , 6 ; Hg workers , 10 ) .
In comparison to the surprisingly high Hg concentration in blood ( median , 9 . 0 microg/l ; max , 31 . 3 ) and in hair ( 2 . 65 microg/g ; max , 34 . 7 ) of the control group , only the workers show elevated levels : Hg-blood median 11 . 4 , max 107 . 6 ; Hg-hair median 3 . 62 , max 37 . 8 .
The Hg urine concentrations of the occupational exposed and non-exposed population on Mt .
Diwata was significantly higher than in the control group : control median 1 . 7 microg/l , max 7 . 6 ; non-occupational burdened median 4 . 1 , max 76 . 4 ; and workers median 11 . 0 , max 294 . 2 .
The participants , living downstream on the plain of Monkayo show no statistically significant difference in Hg-blood , Hg-urine or Hg-hair in comparison with the control group .
The German Human-Biological-Monitoring value II ( HBM II ) was exceeded in 19 . 5% ( control ) , 26 . 0% ( downstream ) , 19 . 4% ( Mt .
Diwata , non-occupational ) and 55 . 4% ( workers ) of the cases , the German occupational threshold limit in 19 . 6% of the workers .
Only some of the clinical data , characteristic for Hg intoxication ( eg tremor , loss of memory , bluish discoloration of the gingiva , etc ) , correlate with Hg in blood or urine , but not with Hg in hair .
The medical score sum correlates only with Hg in urine .
The poor correlation between the Hg concentration in the biomonitors to classic clinical signs of chronic Hg intoxication may be explained by several factors : Hg in blood , urine and hair do not adequately monitor the Hg burden of the target it issues , especially the brain .
Inter-individual differences in the sensitiveness to Hg are extremely large .
In this area a mixed burden of Hg species must be assumed ( Hg vapor , inorganic Hg , methyl-Hg ) .
Chronic Hg burden may have established damage months or even years before the actual determination of the Hg concentrations in the bio-monitors under quite different burden was performed ( Drasch G Mercury .
In : Seiler HG , Sigel A , Sigel H , editors .
Handbook on metals in clinical and analytical chemistry .
New York : Marcel Dekker , 1994 : 479-494 ) .
Therefore , a Hg intoxication , that should be treated , was not diagnosed by the Hg concentration in the bio-monitors alone , but by a balanced combination of these Hg values and the medical score sum .
In principle , this means the higher the Hg concentration in the bio-monitors , the lower the number of characteristic adverse effects are required for a positive diagnosis .
By this method , 0% of the controls , 38% downstream , 27% from Mt .
Diwata , non-occupational exposed and 71 . 6% of the workers were classified as Hg intoxicated .
A reduction of the external Hg burden on Mt .
Diwata is urgently recommended .
An attempt to treat the intoxicated participants with the chelating agent dimercaptopropanesulfonic acid ( DMPS ) is planned .
| Matching Sentences:
[ Sen. 25, subscore: 4.00 ]: The poor correlation between the Hg concentration in the biomonitors to classic clinical signs of chronic Hg intoxication may be explained by several factors : Hg in blood , urine and hair do not adequately monitor the Hg burden of the target it issues , especially the brain .
[ Sen. 17, subscore: 3.00 ]: In comparison to the surprisingly high Hg concentration in blood ( median , 9 . 0 microg/l ; max , 31 . 3 ) and in hair ( 2 . 65 microg/g ; max , 34 . 7 ) of the control group , only the workers show elevated levels : Hg-blood median 11 . 4 , max 107 . 6 ; Hg-hair median 3 . 62 , max 37 . 8 .
[ Sen. 20, subscore: 3.00 ]: The participants , living downstream on the plain of Monkayo show no statistically significant difference in Hg-blood , Hg-urine or Hg-hair in comparison with the control group .
[ Sen. 23, subscore: 3.00 ]: Only some of the clinical data , characteristic for Hg intoxication ( eg tremor , loss of memory , bluish discoloration of the gingiva , etc ) , correlate with Hg in blood or urine , but not with Hg in hair .
[ Sen. 27, subscore: 3.00 ]: In this area a mixed burden of Hg species must be assumed ( Hg vapor , inorganic Hg , methyl-Hg ) .
[ Sen. 32, subscore: 3.00 ]: Therefore , a Hg intoxication , that should be treated , was not diagnosed by the Hg concentration in the bio-monitors alone , but by a balanced combination of these Hg values and the medical score sum .
[ Sen. 28, subscore: 2.00 ]: Chronic Hg burden may have established damage months or even years before the actual determination of the Hg concentrations in the bio-monitors under quite different burden was performed ( Drasch G Mercury .
[ Sen. 4, subscore: 1.00 ]: The ore is dug in small-scale mines and ground to a powder by ball-mills while still in Diwalwal The gold is then extracted by adding liquid mercury ( Hg ) , forming gold-amalgam .
[ Sen. 5, subscore: 1.00 ]: To separate the gold from the Hg , in most cases the amalgam is simply heated in the open by blow-torches .
[ Sen. 6, subscore: 1.00 ]: A high external Hg burden of the local population must be assumed .
[ Sen. 7, subscore: 1.00 ]: To evaluate the internal Hg burden of the population and the extent of possible negative health effects , 323 volunteers from Mt .
[ Sen. 9, subscore: 1.00 ]: Blood , urine and hair samples were taken from each participant and analyzed for total Hg .
[ Sen. 10, subscore: 1.00 ]: A statistical evaluation was possible for 102 workers ( occupationally Hg burdened ball-millers and amalgam-smelters ) , 63 other inhabitants from Mt .
[ Sen. 16, subscore: 1.00 ]: Diwata , non-occupational exposed , 6 ; Hg workers , 10 ) .
[ Sen. 18, subscore: 1.00 ]: The Hg urine concentrations of the occupational exposed and non-exposed population on Mt .
[ Sen. 24, subscore: 1.00 ]: The medical score sum correlates only with Hg in urine .
[ Sen. 26, subscore: 1.00 ]: Inter-individual differences in the sensitiveness to Hg are extremely large .
[ Sen. 29, subscore: 1.00 ]: In : Seiler HG , Sigel A , Sigel H , editors .
[ Sen. 33, subscore: 1.00 ]: In principle , this means the higher the Hg concentration in the bio-monitors , the lower the number of characteristic adverse effects are required for a positive diagnosis .
[ Sen. 35, subscore: 1.00 ]: Diwata , non-occupational exposed and 71 . 6% of the workers were classified as Hg intoxicated .
[ Sen. 36, subscore: 1.00 ]: A reduction of the external Hg burden on Mt .
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Score: 26.00 |
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| Title: Total mercury , methylmercury and selenium in mercury polluted areas in the province Guizhou , China .
| | Author: Horvat M Nolde N Fajon V Jereb V Logar M Lojen S Jacimovic R Falnoga I Liya Q Faganeli J Drobne D | | Journal: Sci .
Total Environ .
Citation: V : 304 ( 1-3 ) P : 231-56 Year: 2003 Type: ARTICLE | | Literature: oryza Field: abstract Doc ID: pub12663187 Accession (PMID): 12663187 | | Abstract: The province of Guizhou in Southwestern China is currently one of the worlds most important mercury production areas .
Emissions of mercury from the province to the global atmosphere have been estimated to be approximately 12% of the world total anthropogenic emissions .
The main objective of this study was to assess the level of contamination with Hg in two geographical areas of Guizhou province .
Mercury pollution in the areas concerned originates from mercury mining and ore processing in the area of Wanshan , while in the area of Quingzhen mercury pollution originates from the chemical industry discharging Hg through wastewaters and emissions to the atmosphere due to coal burning for electricity production .
The results of this study confirmed high contamination with Hg in soil , sediments and rice in the Hg mining area in Wanshan .
High levels of Hg in soil and rice were also found in the vicinity of the chemical plant in Quingzhen .
The concentrations of Hg decreased with distance from the main sources of pollution considerably .
The general conclusion is that Hg contamination in Wanshan is geographically more widespread , due to deposition and scavenging of Hg from contaminated air and deposition on land .
In Quingzhen Hg contamination of soil is very high close to the chemical plant but the levels reach background concentrations at a distance of several km .
Even though the major source of Hg in both areas is inorganic Hg , it was observed that active transformation of inorganic Hg to organic Hg species ( MeHg ) takes place in water , sediments and soils .
The concentration of Hg in rice grains can reach up to 569 microg/kg of total Hg of which 145 microg/kg was in MeHg form .
The percentage of Hg as MeHg varied from 5 to 83% .
The concentrations of selenium can reach up to 16 mg/kg in soil and up to 1 mg/g in rice .
A correlation exists between the concentration of Se in soil and rice , indicating that a portion of Se is bioavailable to plants .
No correlation between Hg and Se in rice was found .
Exposure of the local population to Hg may occur due to inhalation of Hg present in air ( in particular in Hg mining area ) and consumption of Hg contaminated food ( in particular rice and fish ) and water .
Comparison of intake through these different routes showed that the values of Hg considerably exceed the USA EPA Reference Concentration ( RfC ) for chronic Hg exposure ( RfC is 0 . 0004 mg/m ( 3 ) ) close to the emission sources .
Intake of Hg through food consumption , particularly rice and fish , is also an important route of Hg exposure in study area .
In general , it can be concluded that the population mostly at risk is located in the vicinity of smelting facilities , mining activities and close to the waste disposal sites in the wider area of Wanshan .
In order to assess the real level of contamination in the local population , it is recommended that biomonitoring should be performed , including Hg and MeHg measurements in hair , blood and urine samples . | Matching Sentences:
[ Sen. 10, subscore: 4.00 ]: Even though the major source of Hg in both areas is inorganic Hg , it was observed that active transformation of inorganic Hg to organic Hg species ( MeHg ) takes place in water , sediments and soils .
[ Sen. 16, subscore: 4.00 ]: Exposure of the local population to Hg may occur due to inhalation of Hg present in air ( in particular in Hg mining area ) and consumption of Hg contaminated food ( in particular rice and fish ) and water .
[ Sen. 5, subscore: 2.00 ]: The results of this study confirmed high contamination with Hg in soil , sediments and rice in the Hg mining area in Wanshan .
[ Sen. 8, subscore: 2.00 ]: The general conclusion is that Hg contamination in Wanshan is geographically more widespread , due to deposition and scavenging of Hg from contaminated air and deposition on land .
[ Sen. 11, subscore: 2.00 ]: The concentration of Hg in rice grains can reach up to 569 microg/kg of total Hg of which 145 microg/kg was in MeHg form .
[ Sen. 17, subscore: 2.00 ]: Comparison of intake through these different routes showed that the values of Hg considerably exceed the USA EPA Reference Concentration ( RfC ) for chronic Hg exposure ( RfC is 0 . 0004 mg/m ( 3 ) ) close to the emission sources .
[ Sen. 18, subscore: 2.00 ]: Intake of Hg through food consumption , particularly rice and fish , is also an important route of Hg exposure in study area .
[ Sen. 3, subscore: 1.00 ]: The main objective of this study was to assess the level of contamination with Hg in two geographical areas of Guizhou province .
[ Sen. 4, subscore: 1.00 ]: Mercury pollution in the areas concerned originates from mercury mining and ore processing in the area of Wanshan , while in the area of Quingzhen mercury pollution originates from the chemical industry discharging Hg through wastewaters and emissions to the atmosphere due to coal burning for electricity production .
[ Sen. 6, subscore: 1.00 ]: High levels of Hg in soil and rice were also found in the vicinity of the chemical plant in Quingzhen .
[ Sen. 7, subscore: 1.00 ]: The concentrations of Hg decreased with distance from the main sources of pollution considerably .
[ Sen. 9, subscore: 1.00 ]: In Quingzhen Hg contamination of soil is very high close to the chemical plant but the levels reach background concentrations at a distance of several km .
[ Sen. 12, subscore: 1.00 ]: The percentage of Hg as MeHg varied from 5 to 83% .
[ Sen. 15, subscore: 1.00 ]: No correlation between Hg and Se in rice was found .
[ Sen. 20, subscore: 1.00 ]: In order to assess the real level of contamination in the local population , it is recommended that biomonitoring should be performed , including Hg and MeHg measurements in hair , blood and urine samples .
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Score: 20.00 |
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| Title: Mercury pollution in Guizhou , Southwestern China - An overview .
| | Author: Feng X Qiu G | | Journal: Sci Total Environ Citation: V : P : Year: 2008 Type: Publisher | | Literature: oryza Field: abstract Doc ID: pub18617222 Accession (PMID): 18617222 | | Abstract: Mercury ( Hg ) is a global pollutant and poses a worldwide concern due to its high toxicity .
Guizhou province is recognized as a heavily Hg-polluted area in China due to both the special geochemical background and human activities .
Here an integrated overview of current knowledge on the behavior of Hg in environments , as well as human health risk with respect to Hg contaminations in Guizhou was presented .
Two key anthropogenic Hg emission sources in Guizhou were coal combustion and metals smelting , which dominantly contributed to the high levels of Hg in local ecosystems and high fluxes of Hg deposition .
The annual Hg emission from anthropogenic sources ranged between 22 . 6 and 55 . 5 t , which was about 6 . 3-10 . 3% of current total Hg emissions in China .
Meanwhile , Hg Hg-enriched soil in the province serves an important natural Hg emission source to the ambient air .
The local environment of Hg mining and zinc smelting areas are seriously contaminated with Hg .
It is demonstrated that rice growing in Hg Hg-contaminated soil can accumulate methylmercury ( MeHg ) to a level to pose health threat to local inhabitants whose staple food is rice .
Local inhabitants in Hg mining areas are exposed to Hg through inhalation of Hg vapor and consumption of rice with high level of MeHg .
Rice intake is indeed the main MeHg exposure pathway to local inhabitants in Hg mining areas in Guizhou , which is contrary to the general point of view that fish and fish products are the main pathway of MeHg exposure to humans .
| Matching Sentences:
[ Sen. 4, subscore: 3.00 ]: Two key anthropogenic Hg emission sources in Guizhou were coal combustion and metals smelting , which dominantly contributed to the high levels of Hg in local ecosystems and high fluxes of Hg deposition .
[ Sen. 6, subscore: 3.00 ]: Meanwhile , Hg Hg-enriched soil in the province serves an important natural Hg emission source to the ambient air .
[ Sen. 9, subscore: 3.00 ]: Local inhabitants in Hg mining areas are exposed to Hg through inhalation of Hg vapor and consumption of rice with high level of MeHg .
[ Sen. 3, subscore: 2.00 ]: Here an integrated overview of current knowledge on the behavior of Hg in environments , as well as human health risk with respect to Hg contaminations in Guizhou was presented .
[ Sen. 5, subscore: 2.00 ]: The annual Hg emission from anthropogenic sources ranged between 22 . 6 and 55 . 5 t , which was about 6 . 3-10 . 3% of current total Hg emissions in China .
[ Sen. 7, subscore: 2.00 ]: The local environment of Hg mining and zinc smelting areas are seriously contaminated with Hg .
[ Sen. 8, subscore: 2.00 ]: It is demonstrated that rice growing in Hg Hg-contaminated soil can accumulate methylmercury ( MeHg ) to a level to pose health threat to local inhabitants whose staple food is rice .
[ Sen. 1, subscore: 1.00 ]: Mercury ( Hg ) is a global pollutant and poses a worldwide concern due to its high toxicity .
[ Sen. 2, subscore: 1.00 ]: Guizhou province is recognized as a heavily Hg-polluted area in China due to both the special geochemical background and human activities .
[ Sen. 10, subscore: 1.00 ]: Rice intake is indeed the main MeHg exposure pathway to local inhabitants in Hg mining areas in Guizhou , which is contrary to the general point of view that fish and fish products are the main pathway of MeHg exposure to humans .
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Score: 15.00 |
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| Title: Environmental assessment of mercury contamination from the Rwamagasa artisanal gold mining centre , Geita District , Tanzania .
| | Author: Taylor H Appleton JD Lister R Smith B Chitamweba D Mkumbo O Machiwa JF Tesha AL Beinhoff C | | Journal: Sci .
Total Environ .
Citation: V : 343 ( 1-3 ) P : 111-33 Year: 2005 Type: ARTICLE | | Literature: oryza Field: abstract Doc ID: pub15862840 Accession (PMID): 15862840 | | Abstract: This study presents the results of an environmental assessment of mercury ( Hg ) contamination in the Rwamagasa artisanal gold mining area , northwest Tanzania , and the potential downstream dispersion along the River Malagarasi to Lake Tanganyika .
At the time of sampling , generally low concentrations of Hg ( <0 . 05 mg/kg ) occurred in most cultivated soils although higher Hg ( 0 . 05-9 . 2 mg/kg ) was recorded in urban soils and vegetable plot soils where these are impacted by Hg-contaminated water and sediment derived from mineral processing activities .
Hg in vegetable and grain samples is mostly below the detection limit of 0 . 004 mg/kg Hg , apart from 0 . 007 and 0 . 092 mg/kg Hg in two yam samples and 0 . 011 to 0 . 013 mg/kg Hg in three rice samples .
The standardized ( ie , standardized to 10 cm length ) Hg concentrations in Clarias spp . increase from about 0 . 01 mg Hg/kg for the River Malagarasi delta to 0 . 07 , 0 . 2 , and 1 . 6 mg/kg , respectively , for the Rwamagasa background , moderately and most contaminated sites .
For piscivorous ( Lates , Brycinus , and Hydrocynus spp . ) , insectivorous ( Barbus spp . ) , and planktivorous ( Haplochromis spp . ) fish species , the 10-cm standardized Hg concentrations increase from about 0 . 006 mg/kg for the River Malagarasi-Lake Tanganyika area to 0 . 5 and 3 . 5 mg/kg , respectively , for the Rwamagasa moderately and most contaminated sites .
The low concentrations of Hg in fish from the Malagarasi River delta and Lake Tanganyika indicate that Hg contamination from the Rwamagasa area does not have a readily discernible impact on the biota of Lake Tanganyika .
Many of the fish samples from Rwamagasa exceed guidelines for human consumption ( 0 . 5 mg/kg ) as well as the WHO recommended limit for vulnerable groups ( 0 . 2 mg/kg ) .
Tissue total Hg ( THg ) of all fish collected from the River Malagarasi-Lake Tanganyika subarea is well below these guidelines .
Potential human exposure through consumption of 300 g/day of rice grown on Hg-contaminated soils is 5 . 5 microg/week .
Consumption of 250 g Nile perch ( Lates spp . ) , 500 g tilapia ( Oreochromis spp . ) , and 250 g of catfish ( Clarias spp . ) each week would result in an intake of 65 microg Hg/week for people consuming only fish from the Mara and Mwanza regions of Lake Victoria and 116 microg Hg/week for people in the Rwamagasa area consuming tilapia and Nile perch from Lake Victoria and catfish from mining-impacted streams .
This is lower than the Provisional Tolerable Weekly Intake ( PTWI ) of 300 microg for Hg in the diet set by the WHO and the FAO .
Inadvertent ingestion of soil containing 9 mg Hg/kg at a rate of 80 mg/day would give an additional estimated weekly intake of 5 microg THg , whereas the persistent and purposeful consumption of soil ( geophagia ) at a rate of 26 g soil/day would produce an additional chemical exposure of 230 microg Hg/day .
| Matching Sentences:
[ Sen. 3, subscore: 4.00 ]: Hg in vegetable and grain samples is mostly below the detection limit of 0 . 004 mg/kg Hg , apart from 0 . 007 and 0 . 092 mg/kg Hg in two yam samples and 0 . 011 to 0 . 013 mg/kg Hg in three rice samples .
[ Sen. 2, subscore: 3.00 ]: At the time of sampling , generally low concentrations of Hg ( <0 . 05 mg/kg ) occurred in most cultivated soils although higher Hg ( 0 . 05-9 . 2 mg/kg ) was recorded in urban soils and vegetable plot soils where these are impacted by Hg-contaminated water and sediment derived from mineral processing activities .
[ Sen. 6, subscore: 2.00 ]: The low concentrations of Hg in fish from the Malagarasi River delta and Lake Tanganyika indicate that Hg contamination from the Rwamagasa area does not have a readily discernible impact on the biota of Lake Tanganyika .
[ Sen. 1, subscore: 1.00 ]: This study presents the results of an environmental assessment of mercury ( Hg ) contamination in the Rwamagasa artisanal gold mining area , northwest Tanzania , and the potential downstream dispersion along the River Malagarasi to Lake Tanganyika .
[ Sen. 4, subscore: 1.00 ]: The standardized ( ie , standardized to 10 cm length ) Hg concentrations in Clarias spp . increase from about 0 . 01 mg Hg/kg for the River Malagarasi delta to 0 . 07 , 0 . 2 , and 1 . 6 mg/kg , respectively , for the Rwamagasa background , moderately and most contaminated sites .
[ Sen. 5, subscore: 1.00 ]: For piscivorous ( Lates , Brycinus , and Hydrocynus spp . ) , insectivorous ( Barbus spp . ) , and planktivorous ( Haplochromis spp . ) fish species , the 10-cm standardized Hg concentrations increase from about 0 . 006 mg/kg for the River Malagarasi-Lake Tanganyika area to 0 . 5 and 3 . 5 mg/kg , respectively , for the Rwamagasa moderately and most contaminated sites .
[ Sen. 8, subscore: 1.00 ]: Tissue total Hg ( THg ) of all fish collected from the River Malagarasi-Lake Tanganyika subarea is well below these guidelines .
[ Sen. 9, subscore: 1.00 ]: Potential human exposure through consumption of 300 g/day of rice grown on Hg-contaminated soils is 5 . 5 microg/week .
[ Sen. 11, subscore: 1.00 ]: This is lower than the Provisional Tolerable Weekly Intake ( PTWI ) of 300 microg for Hg in the diet set by the WHO and the FAO .
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Score: 13.00 |
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| Title: Adsorption-desorption characteristics of mercury in paddy soils of china .
| | Author: Jing YD He ZL Yang XE | | Journal: J Environ Qual Citation: V : 37 P : 680-8 Year: 2008 Type: In-Data-Review | | Literature: oryza Field: abstract Doc ID: pub18299603 Accession (PMID): 18299603 | | Abstract: Mercury ( Hg ) has received considerable attention because of its association with various human health problems .
Adsorption-desorption behavior of Hg at contaminated levels in two paddy soils was investigated .
The two representative soils for rice production in China , locally referred to as a yellowish red soil ( YRS ) and silty loam soil ( SLS ) and classified as Gleyi-Stagnic Anthrosols in FAO/UNESCO nomenclature , were respectively collected from Jiaxin County and Xiasha District of Hangzhou City , Zhejiang Province .
The YRS adsorbed more Hg ( 2+ ) than the SLS .
The characteristics of Hg adsorption could be described by the simple Langmuir adsorption equation ( r ( 2 ) = 0 . 999 and 0 . 999 , P < 0 . 01 , respectively , for the SLS and YRS ) .
The maximum adsorption values ( X ( m ) ) that were obtained from the simple Langmuir model were 111 and 213 mg Hg ( 2+ ) kg ( -1 ) soil , respectively , for the SLS and YRS .
Adsorption of Hg ( 2+ ) decreased soil pH by 0 . 75 unit for the SLS soil and 0 . 91 unit for the YRS soil at the highest loading .
The distribution coefficient ( kd ) of Hg in the soil decreased exponentially with increasing Hg ( 2+ ) loading .
After five successive desorptions with 0 . 01 mol L ( -1 ) KCl solution ( pH 5 . 4 ) , 0 to 24 . 4% of the total adsorbed Hg ( 2+ ) in the SLS soil was desorbed and the corresponding value of the YRS soil was 0 to 14 . 4% , indicating that the SLS soil had a lower affinity for Hg ( 2+ ) than the YRS soil at the same Hg ( 2+ ) loading .
Different mechanisms are likely involved in Hg ( 2+ ) adsorption-desorption at different levels of Hg ( 2+ ) loading and between the two soils .
| Matching Sentences:
[ Sen. 9, subscore: 3.00 ]: After five successive desorptions with 0 . 01 mol L ( -1 ) KCl solution ( pH 5 . 4 ) , 0 to 24 . 4% of the total adsorbed Hg ( 2+ ) in the SLS soil was desorbed and the corresponding value of the YRS soil was 0 to 14 . 4% , indicating that the SLS soil had a lower affinity for Hg ( 2+ ) than the YRS soil at the same Hg ( 2+ ) loading .
[ Sen. 8, subscore: 2.00 ]: The distribution coefficient ( kd ) of Hg in the soil decreased exponentially with increasing Hg ( 2+ ) loading .
[ Sen. 10, subscore: 2.00 ]: Different mechanisms are likely involved in Hg ( 2+ ) adsorption-desorption at different levels of Hg ( 2+ ) loading and between the two soils .
[ Sen. 1, subscore: 1.00 ]: Mercury ( Hg ) has received considerable attention because of its association with various human health problems .
[ Sen. 2, subscore: 1.00 ]: Adsorption-desorption behavior of Hg at contaminated levels in two paddy soils was investigated .
[ Sen. 4, subscore: 1.00 ]: The YRS adsorbed more Hg ( 2+ ) than the SLS .
[ Sen. 5, subscore: 1.00 ]: The characteristics of Hg adsorption could be described by the simple Langmuir adsorption equation ( r ( 2 ) = 0 . 999 and 0 . 999 , P < 0 . 01 , respectively , for the SLS and YRS ) .
[ Sen. 6, subscore: 1.00 ]: The maximum adsorption values ( X ( m ) ) that were obtained from the simple Langmuir model were 111 and 213 mg Hg ( 2+ ) kg ( -1 ) soil , respectively , for the SLS and YRS .
[ Sen. 7, subscore: 1.00 ]: Adsorption of Hg ( 2+ ) decreased soil pH by 0 . 75 unit for the SLS soil and 0 . 91 unit for the YRS soil at the highest loading .
| | Supplemental links/files: reference in endnote online text related articles pubmed citation | |
