Characteristics and role of groundwater dissolved organic matter on arsenic mobilization and poisoning in Bangladesh

Arsenic and Fluorescent Humic Substances in the Ground Water of Bangladesh

“…Similar results have already been observed in other As-contaminated areas [49]. Similar results have already been observed in other As-contaminated areas [49].…”

“…The fluorescence spectral patterns of groundwater samples from both As-contaminated and -uncontaminated areas are very similar (Figure 3-6A and B). The decrease in DOC concentration during transport has been previously found in other groundwater sites in Bangladesh [49]. In contrary, ground water from uncontaminated areas has only a humic-like peak with relatively low fluorescence intensity (Figure 3-6B).…”

“…HPSEC separated groundwater humic substances into three completely resolved peaks of different molecular weights with particular retention times. On the other hand, surface water in the study areas had 1.24 kDa and 0.65 kDa molecules [49]. In most of the groundwater samples, 1.24 and 0.65 kDa molecules were predominant, with the presence of 1.81 kDa molecules.…”

Association between arsenic and different-sized dissolved organic matter in the groundwater of black-foot disease area, Taiwan

“…The small molecular weight DOM and arsenic complexes could enhance the inhibition of plasmin activity as compared with either DOM or arsenic alone (Hseu et al, 2001). Both arsenic and small molecular weight DOM occurred in high concentrations in the Bangladesh groundwater, and thus their combined effects may enhance arsenic poisoning (Tareq et al, 2013).…”

“…Significant differences observed in arsenic concentrations among various molecular weight DOM fractions have indicated that molecular weight is a fundamental DOM property and potentially affects the binding behavior between DOM fractions and arsenic (Tareq et al, 2013). However, only a few studies have documented the formation of As-DOM complexes in groundwater, although this complexation may critically affect the mobility and toxicity of arsenic species Cai, 2010, 2013).…”