DETERMINATION OF HEAVY METALS IN CHOAPA RIVER SEDIMENTS USING BCR SEQUENTIAL EXTRACTION PROCEDURE

In recent years Chile has experienced a significant increase in mining activities, which has resulted in an increase in waste generation. The dispersion of these residues in the air, water and soil has led to negative changes in the environment. This main objective of this study is to identify the i...

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Autores principales:	COPAJA,SYLVIA V, MOLINA,XIMENA, TESSADA,ROXANA
Lenguaje:	English
Publicado:	Sociedad Chilena de Química 2014
Materias:	Heavy metals sequential extraction (BCR) river sediments Choapa Basin
Acceso en línea:	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072014000100023
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spelling	oai:scielo:S0717-970720140001000232015-11-12DETERMINATION OF HEAVY METALS IN CHOAPA RIVER SEDIMENTS USING BCR SEQUENTIAL EXTRACTION PROCEDURECOPAJA,SYLVIA VMOLINA,XIMENATESSADA,ROXANA Heavy metals sequential extraction (BCR) river sediments Choapa Basin In recent years Chile has experienced a significant increase in mining activities, which has resulted in an increase in waste generation. The dispersion of these residues in the air, water and soil has led to negative changes in the environment. This main objective of this study is to identify the influence of the copper mine Los Pelambres (station E2) located in the Choapa River Basin (IV Region Coquimbo). To achieve this goal we performed an analysis of the physical and chemical composition of sediment samples in the summer season taken from the rithron to potamon areas of the watershed. River sediments can provide information and influence the degree of pollution in a given area due to mining discharges. The analysis was based on two types of determinations: total metal content, which provides an assessment of the level of contamination, and studies of different chemicals in which the metal is associated with the sediment. The results of this study showed that station E2 (Cuncumen River) has a particular behavior in the basin, showing higher content of metallic trace elements; for example, the concentration of Cu (total fraction) was 4814.1 μgg-1. In the rest of the stations the metal content was less than in E2 (total Cu from 42.4 μgg-1 in E1 to 136.2 μgg-1 in E5), therefore it is concluded that there is no direct influence of the mining activity of Los Pelambres station (E2) in the rest of the basin. BCR sequential extraction of sediments, developed under the auspices of the Community Bureau of Reference, indicated metal mobility. Metal mobility is closely associated with the chemical conditions of the system. In general, metals that could have greatest mobility in the basin are: Cu, Cd, Zn and Mn, found in the soluble acid fraction, together with oxidant (organic matter) and reducing (Fe and Mn oxides) conditions. The cluster analysis of the total fraction of metal content in sediments indicates that the mine discharge site (E2), has a unique behavior in the basin. Station E2 showed a similarity below 50%, while the rest of the basin showed a similarity above 70%. Overall the results indicate that the Los Pelambres Mine is not a direct source of heavy metals in the Choapa River Basin, which does not imply that station E2 (Cuncumen River) has no influence on the metal content of sediments. To determine the area of this season, the study area should be narrowed to Cuncumen River (E2) section of the Choapa River Basin, since the physical conditions of the system, hydrographic conditions and climatic do not allow a high rate of discharge and mobility of heavy metals from the mining area with high discharge to the last station (Huentelauquen).info:eu-repo/semantics/openAccessSociedad Chilena de QuímicaJournal of the Chilean Chemical Society v.59 n.1 20142014-03-01text/htmlhttp://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072014000100023en10.4067/S0717-97072014000100023
institution	Scielo Chile
collection	Scielo Chile
language	English
topic	Heavy metals sequential extraction (BCR) river sediments Choapa Basin
spellingShingle	Heavy metals sequential extraction (BCR) river sediments Choapa Basin COPAJA,SYLVIA V MOLINA,XIMENA TESSADA,ROXANA DETERMINATION OF HEAVY METALS IN CHOAPA RIVER SEDIMENTS USING BCR SEQUENTIAL EXTRACTION PROCEDURE
description	In recent years Chile has experienced a significant increase in mining activities, which has resulted in an increase in waste generation. The dispersion of these residues in the air, water and soil has led to negative changes in the environment. This main objective of this study is to identify the influence of the copper mine Los Pelambres (station E2) located in the Choapa River Basin (IV Region Coquimbo). To achieve this goal we performed an analysis of the physical and chemical composition of sediment samples in the summer season taken from the rithron to potamon areas of the watershed. River sediments can provide information and influence the degree of pollution in a given area due to mining discharges. The analysis was based on two types of determinations: total metal content, which provides an assessment of the level of contamination, and studies of different chemicals in which the metal is associated with the sediment. The results of this study showed that station E2 (Cuncumen River) has a particular behavior in the basin, showing higher content of metallic trace elements; for example, the concentration of Cu (total fraction) was 4814.1 μgg-1. In the rest of the stations the metal content was less than in E2 (total Cu from 42.4 μgg-1 in E1 to 136.2 μgg-1 in E5), therefore it is concluded that there is no direct influence of the mining activity of Los Pelambres station (E2) in the rest of the basin. BCR sequential extraction of sediments, developed under the auspices of the Community Bureau of Reference, indicated metal mobility. Metal mobility is closely associated with the chemical conditions of the system. In general, metals that could have greatest mobility in the basin are: Cu, Cd, Zn and Mn, found in the soluble acid fraction, together with oxidant (organic matter) and reducing (Fe and Mn oxides) conditions. The cluster analysis of the total fraction of metal content in sediments indicates that the mine discharge site (E2), has a unique behavior in the basin. Station E2 showed a similarity below 50%, while the rest of the basin showed a similarity above 70%. Overall the results indicate that the Los Pelambres Mine is not a direct source of heavy metals in the Choapa River Basin, which does not imply that station E2 (Cuncumen River) has no influence on the metal content of sediments. To determine the area of this season, the study area should be narrowed to Cuncumen River (E2) section of the Choapa River Basin, since the physical conditions of the system, hydrographic conditions and climatic do not allow a high rate of discharge and mobility of heavy metals from the mining area with high discharge to the last station (Huentelauquen).
author	COPAJA,SYLVIA V MOLINA,XIMENA TESSADA,ROXANA
author_facet	COPAJA,SYLVIA V MOLINA,XIMENA TESSADA,ROXANA
author_sort	COPAJA,SYLVIA V
title	DETERMINATION OF HEAVY METALS IN CHOAPA RIVER SEDIMENTS USING BCR SEQUENTIAL EXTRACTION PROCEDURE
title_short	DETERMINATION OF HEAVY METALS IN CHOAPA RIVER SEDIMENTS USING BCR SEQUENTIAL EXTRACTION PROCEDURE
title_full	DETERMINATION OF HEAVY METALS IN CHOAPA RIVER SEDIMENTS USING BCR SEQUENTIAL EXTRACTION PROCEDURE
title_fullStr	DETERMINATION OF HEAVY METALS IN CHOAPA RIVER SEDIMENTS USING BCR SEQUENTIAL EXTRACTION PROCEDURE
title_full_unstemmed	DETERMINATION OF HEAVY METALS IN CHOAPA RIVER SEDIMENTS USING BCR SEQUENTIAL EXTRACTION PROCEDURE
title_sort	determination of heavy metals in choapa river sediments using bcr sequential extraction procedure
publisher	Sociedad Chilena de Química
publishDate	2014
url	http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0717-97072014000100023
work_keys_str_mv	AT copajasylviav determinationofheavymetalsinchoapariversedimentsusingbcrsequentialextractionprocedure AT molinaximena determinationofheavymetalsinchoapariversedimentsusingbcrsequentialextractionprocedure AT tessadaroxana determinationofheavymetalsinchoapariversedimentsusingbcrsequentialextractionprocedure
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DETERMINATION OF HEAVY METALS IN CHOAPA RIVER SEDIMENTS USING BCR SEQUENTIAL EXTRACTION PROCEDURE

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