2017
DOI: 10.1016/j.chemosphere.2017.08.143
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Effects of Fe(III) and quality of humic substances on As(V) distribution in freshwater: Use of ultrafiltration and Kohonen neural network

Abstract: Humic substances (HS) are ubiquitous organic compounds able to affect mobility and availability of arsenic (As) in aquatic systems. Although it is known that associations between HS and As occur mainly via iron (Fe)-cationic bridges, the behaviour and distribution of this metalloid in HS- and Fe-rich environments is still not fully understood. In this paper, the quality of HS from different rivers in Brazil and Germany and its influence on the behaviour of As(V) under different Fe(III) concentrations were inve… Show more

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Cited by 15 publications
(3 citation statements)
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“…As a major fraction of natural organic matters (NOM) ubiquitously present in soils and water environments, humic acid (HA) contains one or more functional groups, including phenolic, carboxyl, carbonyl and hydroxyl groups connected with aromatic or aliphatic carbons. These functional groups can result in HA having a very strong chelation capacity with many heavy metals (metalloids) and organic pollutants. This makes the removal or adsorption of contaminants more difficult by reactions at mineral surfaces. Subsequently, mobilization of arsenic was enhanced, and Cd bioavailability was increased by HA, leading to a significant accumulation in aquatic biota …”
Section: Introductionmentioning
confidence: 99%
“…As a major fraction of natural organic matters (NOM) ubiquitously present in soils and water environments, humic acid (HA) contains one or more functional groups, including phenolic, carboxyl, carbonyl and hydroxyl groups connected with aromatic or aliphatic carbons. These functional groups can result in HA having a very strong chelation capacity with many heavy metals (metalloids) and organic pollutants. This makes the removal or adsorption of contaminants more difficult by reactions at mineral surfaces. Subsequently, mobilization of arsenic was enhanced, and Cd bioavailability was increased by HA, leading to a significant accumulation in aquatic biota …”
Section: Introductionmentioning
confidence: 99%
“…On the other hand, maps with a large number of neurons will have samples that are too far away from each other. With both low and high number of neurons, this would have prevented the possibility to extract information (Garcia et al, 2007;Gontijo et al, 2017). For this reason, architectures from 6 × 6 to 14 × 14 neurons were trained.…”
mentioning
confidence: 99%
“…Bodyanskiy proposed that the cognition and feeling of sports behavior are related to sports behavior, sports persistence, and sports experience and can directly affect sports behavior [5]. Watanabe proposes to use sports to make people come out of busy work, improve their physical health and find a communication partner, obtain spiritual comfort, and achieve the optimization of the social support network [6].…”
Section: Introductionmentioning
confidence: 99%