Arsenic Mobility in As-Containing Soils from Geogenic Origin: Fractionation and Leachability
The lithogenic arsenic in soils of the Anllóns River basin (Spain) was quantified, its chemical fractions were determined, and its leachability characteristics were compared under various experimental conditions. Fifty soil samples of C horizons, sampling an area of 50 km2 along the river course, we...
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Wiley
2018-01-01
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| Series: | Journal of Chemistry |
| Online Access: | http://dx.doi.org/10.1155/2018/7328203 |
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| author | Diego Martiñá-Prieto Javier Cancelo-González María Teresa Barral |
| author_facet | Diego Martiñá-Prieto Javier Cancelo-González María Teresa Barral |
| author_sort | Diego Martiñá-Prieto |
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| description | The lithogenic arsenic in soils of the Anllóns River basin (Spain) was quantified, its chemical fractions were determined, and its leachability characteristics were compared under various experimental conditions. Fifty soil samples of C horizons, sampling an area of 50 km2 along the river course, were submitted to an exploratory analysis. Pseudo-total arsenic ranged between 2 and 489 mg kg−1. Arsenic leachability using the standard methods DIN 38414-S4 and TCLP was less than 0.25% of pseudo-total As. Then the effect of pH (3, 6, and 9), solid : liquid (S : L) ratio (1 : 10 and 1 : 50), phosphate (10 mM), and contact time (24 and 240 h) on arsenic mobilization was studied in nine soils with the highest As concentration. Arsenic mobilization increased at alkaline pH and lower S : L ratio; the most decisive factor was the addition of phosphate, increasing arsenic leachability up to 1,000 times, and this increased even 2.3 times when the contact time was extended from 24 hours to 240 hours. The results suggest that the mobilization of arsenic may be underestimated in short-term water leaching tests and that the environmental conditions favouring arsenic mobilization should be taken into account for a sound evaluation of the transfer risk of arsenic towards aquatic ecosystems. |
| format | Article |
| id | doaj-art-479c88ce44244effa679700007b56344 |
| institution | Kabale University |
| issn | 2090-9063 2090-9071 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | Wiley |
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| series | Journal of Chemistry |
| spelling | doaj-art-479c88ce44244effa679700007b563442025-02-03T01:28:40ZengWileyJournal of Chemistry2090-90632090-90712018-01-01201810.1155/2018/73282037328203Arsenic Mobility in As-Containing Soils from Geogenic Origin: Fractionation and LeachabilityDiego Martiñá-Prieto0Javier Cancelo-González1María Teresa Barral2Departamento de Edafoloxía e Química Agrícola, Facultade de Farmacia, Campus Vida, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, SpainDepartamento de Edafoloxía e Química Agrícola, Facultade de Farmacia, Campus Vida, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, SpainDepartamento de Edafoloxía e Química Agrícola, Facultade de Farmacia, Campus Vida, Universidade de Santiago de Compostela, 15782 Santiago de Compostela, SpainThe lithogenic arsenic in soils of the Anllóns River basin (Spain) was quantified, its chemical fractions were determined, and its leachability characteristics were compared under various experimental conditions. Fifty soil samples of C horizons, sampling an area of 50 km2 along the river course, were submitted to an exploratory analysis. Pseudo-total arsenic ranged between 2 and 489 mg kg−1. Arsenic leachability using the standard methods DIN 38414-S4 and TCLP was less than 0.25% of pseudo-total As. Then the effect of pH (3, 6, and 9), solid : liquid (S : L) ratio (1 : 10 and 1 : 50), phosphate (10 mM), and contact time (24 and 240 h) on arsenic mobilization was studied in nine soils with the highest As concentration. Arsenic mobilization increased at alkaline pH and lower S : L ratio; the most decisive factor was the addition of phosphate, increasing arsenic leachability up to 1,000 times, and this increased even 2.3 times when the contact time was extended from 24 hours to 240 hours. The results suggest that the mobilization of arsenic may be underestimated in short-term water leaching tests and that the environmental conditions favouring arsenic mobilization should be taken into account for a sound evaluation of the transfer risk of arsenic towards aquatic ecosystems.http://dx.doi.org/10.1155/2018/7328203 |
| spellingShingle | Diego Martiñá-Prieto Javier Cancelo-González María Teresa Barral Arsenic Mobility in As-Containing Soils from Geogenic Origin: Fractionation and Leachability Journal of Chemistry |
| title | Arsenic Mobility in As-Containing Soils from Geogenic Origin: Fractionation and Leachability |
| title_full | Arsenic Mobility in As-Containing Soils from Geogenic Origin: Fractionation and Leachability |
| title_fullStr | Arsenic Mobility in As-Containing Soils from Geogenic Origin: Fractionation and Leachability |
| title_full_unstemmed | Arsenic Mobility in As-Containing Soils from Geogenic Origin: Fractionation and Leachability |
| title_short | Arsenic Mobility in As-Containing Soils from Geogenic Origin: Fractionation and Leachability |
| title_sort | arsenic mobility in as containing soils from geogenic origin fractionation and leachability |
| url | http://dx.doi.org/10.1155/2018/7328203 |
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