Arsenic in rice agrosystems (water, soil and rice plants) in Guayas and Los Ríos provinces, Ecuador
Geogenic arsenic (As) can accumulate and reach high concentrations in rice grains, thus representing a potential threat to human health. Ecuador is one of the main consumers of rice in South America. However, there is no information available about the concentrations of As in rice agrosystems, altho...
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| Veröffentlicht in: | The Science of the total environment 2016-12, Vol.573, p.778-787 |
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| creator | Otero, X.L. Tierra, W. Atiaga, O. Guanoluisa, D. Nunes, L.M. Ferreira, T.O. Ruales, J. |
| description | Geogenic arsenic (As) can accumulate and reach high concentrations in rice grains, thus representing a potential threat to human health. Ecuador is one of the main consumers of rice in South America. However, there is no information available about the concentrations of As in rice agrosystems, although some water bodies are known to contain high levels of the element. We carried out extensive sampling of water, soil, rice plants and commercial rice (obtained from local markets). Water samples were analysed to determine physico-chemical properties and concentrations of dissolved arsenic. Soil samples were analysed to determine total organic C, texture, total Fe and amorphous Fe oxyhydroxides (FeOx), total arsenic (tAs) and the bioavailable fraction (AsMe). The different plant parts were analysed separately to determine total (tAs), inorganic (iAs) and organic arsenic (oAs). Low concentrations of arsenic were found in samples of water (generally 80%) in all parts of the rice plants.
•Arsenic concentration in rice grains differed between provinces.•Amorphous Fe oxyhydroxides limit assimilation of arsenic by rice.•Physiological processes in rice plants may limit arsenic accumulation in the grains.•Inorganic arsenic is the dominant form of the element in the rice plant.
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| doi_str_mv | 10.1016/j.scitotenv.2016.08.162 |
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•Arsenic concentration in rice grains differed between provinces.•Amorphous Fe oxyhydroxides limit assimilation of arsenic by rice.•Physiological processes in rice plants may limit arsenic accumulation in the grains.•Inorganic arsenic is the dominant form of the element in the rice plant.
[Display omitted]</description><identifier>ISSN: 0048-9697</identifier><identifier>EISSN: 1879-1026</identifier><identifier>DOI: 10.1016/j.scitotenv.2016.08.162</identifier><identifier>PMID: 27592465</identifier><language>eng</language><publisher>Netherlands: Elsevier B.V</publisher><subject>Agriculture ; Amorphous Fe oxyhydroxides ; Arsenic - analysis ; Arsenic - metabolism ; Arsenic speciation ; Arsenicals - analysis ; Arsenicals - metabolism ; Ecuador ; Environmental Monitoring ; Food Contamination - analysis ; Oryza - metabolism ; Plant tissues ; Soil Pollutants - analysis ; Soil Pollutants - metabolism ; Water Pollutants, Chemical - analysis ; Water Pollutants, Chemical - metabolism</subject><ispartof>The Science of the total environment, 2016-12, Vol.573, p.778-787</ispartof><rights>2016 Elsevier B.V.</rights><rights>Copyright © 2016 Elsevier B.V. All rights reserved.</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c480t-37962dfe9fa439ad4dca69d818b53ab98af5829decbcd0b74065f8ccb7240ede3</citedby><cites>FETCH-LOGICAL-c480t-37962dfe9fa439ad4dca69d818b53ab98af5829decbcd0b74065f8ccb7240ede3</cites><orcidid>0000-0001-5447-1842</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/j.scitotenv.2016.08.162$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,776,780,3536,27903,27904,45974</link.rule.ids><backlink>$$Uhttps://www.ncbi.nlm.nih.gov/pubmed/27592465$$D View this record in MEDLINE/PubMed$$Hfree_for_read</backlink></links><search><creatorcontrib>Otero, X.L.</creatorcontrib><creatorcontrib>Tierra, W.</creatorcontrib><creatorcontrib>Atiaga, O.</creatorcontrib><creatorcontrib>Guanoluisa, D.</creatorcontrib><creatorcontrib>Nunes, L.M.</creatorcontrib><creatorcontrib>Ferreira, T.O.</creatorcontrib><creatorcontrib>Ruales, J.</creatorcontrib><title>Arsenic in rice agrosystems (water, soil and rice plants) in Guayas and Los Ríos provinces, Ecuador</title><title>The Science of the total environment</title><addtitle>Sci Total Environ</addtitle><description>Geogenic arsenic (As) can accumulate and reach high concentrations in rice grains, thus representing a potential threat to human health. Ecuador is one of the main consumers of rice in South America. However, there is no information available about the concentrations of As in rice agrosystems, although some water bodies are known to contain high levels of the element. We carried out extensive sampling of water, soil, rice plants and commercial rice (obtained from local markets). Water samples were analysed to determine physico-chemical properties and concentrations of dissolved arsenic. Soil samples were analysed to determine total organic C, texture, total Fe and amorphous Fe oxyhydroxides (FeOx), total arsenic (tAs) and the bioavailable fraction (AsMe). The different plant parts were analysed separately to determine total (tAs), inorganic (iAs) and organic arsenic (oAs). Low concentrations of arsenic were found in samples of water (generally <10μgl−1) and soil (4.48±3mgkg−1). The tAs in the rice grains was within the usual range (0.042–0.125mgkg−1 dry weight, d.w.) and was significantly lower than in leaves (0.123–0.286mgkg−1 d.w.) and stems (0.091–0.201mgkg−1 d.w.). The FeOx and tAs and also AsMe in flood water were negatively correlated with tAs in the plants. However, the concentrations of As in stems and leaves were linearly correlated with tAs in the soil and flood water. The relationship between tAs and arsenic in the grain fitted a logarithmic function, as did that between tAs in the grain and the stem. The findings seem to indicate that high concentrations of arsenic in the environment (soil or water) or in the rice stem do not necessarily imply accumulation of the element in the grain. The iAs form was dominant (>80%) in all parts of the rice plants.
•Arsenic concentration in rice grains differed between provinces.•Amorphous Fe oxyhydroxides limit assimilation of arsenic by rice.•Physiological processes in rice plants may limit arsenic accumulation in the grains.•Inorganic arsenic is the dominant form of the element in the rice plant.
[Display omitted]</description><subject>Agriculture</subject><subject>Amorphous Fe oxyhydroxides</subject><subject>Arsenic - analysis</subject><subject>Arsenic - metabolism</subject><subject>Arsenic speciation</subject><subject>Arsenicals - analysis</subject><subject>Arsenicals - metabolism</subject><subject>Ecuador</subject><subject>Environmental Monitoring</subject><subject>Food Contamination - analysis</subject><subject>Oryza - metabolism</subject><subject>Plant tissues</subject><subject>Soil Pollutants - analysis</subject><subject>Soil Pollutants - metabolism</subject><subject>Water Pollutants, Chemical - analysis</subject><subject>Water Pollutants, Chemical - metabolism</subject><issn>0048-9697</issn><issn>1879-1026</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2016</creationdate><recordtype>article</recordtype><sourceid>EIF</sourceid><recordid>eNqNkd9q2zAUxsVYabO0r7D5MoXYlWRbfy5DSbtBoFDaayFLx0MhsTMdOyMPtafoi1VZut6uupDg6Pedc_g-Qr4xWjDKxM26QBeGfoBuX_BUKKgqmOCfyIQpqXNGufhMJpRWKtdCywvyBXFN05GKnZMLLmvNK1FPiF9EhC64LHRZDA4y-zP2eMABtpjNftsB4jzDPmwy2_kTsdvYbsDro-J-tAeLf79WPWaPL3_SvYv9PnQOcJ4t3Wh9Hy_JWWs3CFdv75Q83y2fbr_nq4f7H7eLVe4qRYe8lFpw34JubVVq6yvvrNBeMdXUpW20sm2tuPbgGudpIysq6lY510heUfBQTsns1Det8GsEHMw2oINNWhj6EQ1TQpWlTO58AK1qVXJBRULlCXXJGYzQml0MWxsPhlFzTMOszXsa5piGocqkNJLy69uQsdmCf9f9sz8BixMAyZV9gHhsBMk7HyK4wfg-_HfIK0FgoTw</recordid><startdate>20161215</startdate><enddate>20161215</enddate><creator>Otero, X.L.</creator><creator>Tierra, W.</creator><creator>Atiaga, O.</creator><creator>Guanoluisa, D.</creator><creator>Nunes, L.M.</creator><creator>Ferreira, T.O.</creator><creator>Ruales, J.</creator><general>Elsevier B.V</general><scope>CGR</scope><scope>CUY</scope><scope>CVF</scope><scope>ECM</scope><scope>EIF</scope><scope>NPM</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7X8</scope><scope>7ST</scope><scope>C1K</scope><scope>SOI</scope><orcidid>https://orcid.org/0000-0001-5447-1842</orcidid></search><sort><creationdate>20161215</creationdate><title>Arsenic in rice agrosystems (water, soil and rice plants) in Guayas and Los Ríos provinces, Ecuador</title><author>Otero, X.L. ; Tierra, W. ; Atiaga, O. ; Guanoluisa, D. ; Nunes, L.M. ; Ferreira, T.O. ; Ruales, J.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c480t-37962dfe9fa439ad4dca69d818b53ab98af5829decbcd0b74065f8ccb7240ede3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2016</creationdate><topic>Agriculture</topic><topic>Amorphous Fe oxyhydroxides</topic><topic>Arsenic - analysis</topic><topic>Arsenic - metabolism</topic><topic>Arsenic speciation</topic><topic>Arsenicals - analysis</topic><topic>Arsenicals - metabolism</topic><topic>Ecuador</topic><topic>Environmental Monitoring</topic><topic>Food Contamination - analysis</topic><topic>Oryza - metabolism</topic><topic>Plant tissues</topic><topic>Soil Pollutants - analysis</topic><topic>Soil Pollutants - metabolism</topic><topic>Water Pollutants, Chemical - analysis</topic><topic>Water Pollutants, Chemical - metabolism</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Otero, X.L.</creatorcontrib><creatorcontrib>Tierra, W.</creatorcontrib><creatorcontrib>Atiaga, O.</creatorcontrib><creatorcontrib>Guanoluisa, D.</creatorcontrib><creatorcontrib>Nunes, L.M.</creatorcontrib><creatorcontrib>Ferreira, T.O.</creatorcontrib><creatorcontrib>Ruales, J.</creatorcontrib><collection>Medline</collection><collection>MEDLINE</collection><collection>MEDLINE (Ovid)</collection><collection>MEDLINE</collection><collection>MEDLINE</collection><collection>PubMed</collection><collection>CrossRef</collection><collection>MEDLINE - Academic</collection><collection>Environment Abstracts</collection><collection>Environmental Sciences and Pollution Management</collection><collection>Environment Abstracts</collection><jtitle>The Science of the total environment</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Otero, X.L.</au><au>Tierra, W.</au><au>Atiaga, O.</au><au>Guanoluisa, D.</au><au>Nunes, L.M.</au><au>Ferreira, T.O.</au><au>Ruales, J.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Arsenic in rice agrosystems (water, soil and rice plants) in Guayas and Los Ríos provinces, Ecuador</atitle><jtitle>The Science of the total environment</jtitle><addtitle>Sci Total Environ</addtitle><date>2016-12-15</date><risdate>2016</risdate><volume>573</volume><spage>778</spage><epage>787</epage><pages>778-787</pages><issn>0048-9697</issn><eissn>1879-1026</eissn><abstract>Geogenic arsenic (As) can accumulate and reach high concentrations in rice grains, thus representing a potential threat to human health. Ecuador is one of the main consumers of rice in South America. However, there is no information available about the concentrations of As in rice agrosystems, although some water bodies are known to contain high levels of the element. We carried out extensive sampling of water, soil, rice plants and commercial rice (obtained from local markets). Water samples were analysed to determine physico-chemical properties and concentrations of dissolved arsenic. Soil samples were analysed to determine total organic C, texture, total Fe and amorphous Fe oxyhydroxides (FeOx), total arsenic (tAs) and the bioavailable fraction (AsMe). The different plant parts were analysed separately to determine total (tAs), inorganic (iAs) and organic arsenic (oAs). Low concentrations of arsenic were found in samples of water (generally <10μgl−1) and soil (4.48±3mgkg−1). The tAs in the rice grains was within the usual range (0.042–0.125mgkg−1 dry weight, d.w.) and was significantly lower than in leaves (0.123–0.286mgkg−1 d.w.) and stems (0.091–0.201mgkg−1 d.w.). The FeOx and tAs and also AsMe in flood water were negatively correlated with tAs in the plants. However, the concentrations of As in stems and leaves were linearly correlated with tAs in the soil and flood water. The relationship between tAs and arsenic in the grain fitted a logarithmic function, as did that between tAs in the grain and the stem. The findings seem to indicate that high concentrations of arsenic in the environment (soil or water) or in the rice stem do not necessarily imply accumulation of the element in the grain. The iAs form was dominant (>80%) in all parts of the rice plants.
•Arsenic concentration in rice grains differed between provinces.•Amorphous Fe oxyhydroxides limit assimilation of arsenic by rice.•Physiological processes in rice plants may limit arsenic accumulation in the grains.•Inorganic arsenic is the dominant form of the element in the rice plant.
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| subjects | Agriculture Amorphous Fe oxyhydroxides Arsenic - analysis Arsenic - metabolism Arsenic speciation Arsenicals - analysis Arsenicals - metabolism Ecuador Environmental Monitoring Food Contamination - analysis Oryza - metabolism Plant tissues Soil Pollutants - analysis Soil Pollutants - metabolism Water Pollutants, Chemical - analysis Water Pollutants, Chemical - metabolism |
| title | Arsenic in rice agrosystems (water, soil and rice plants) in Guayas and Los Ríos provinces, Ecuador |
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