https://scholars.lib.ntu.edu.tw/handle/123456789/446337
標題: | Association between arsenic and different-sized dissolved organic matter in the groundwater of black-foot disease area, Taiwan | 作者: | Chen T.-C. ZENG-YEI HSEU Jean J.-S. Chou M.-L. |
關鍵字: | Arsenic; Black-foot disease; Dissolved organic matter; Fluorescence; Groundwater | 公開日期: | 2016 | 卷: | 159 | 起(迄)頁: | 214-220 | 來源出版物: | Chemosphere | 摘要: | The formation of an arsenic (As)-dissolved organic matter (DOM) complex is important in driving the release of arsenic in groundwater. This study collected groundwater samples from a 20 m deep well throughout 2014 and separated each into three subsamples by ultrafiltration: high molecular weight-DOM (HDOM, 0.45 μm-10 kDa), medium molecular weight-DOM (MDOM, 10-1 kDa), and low molecular weight-DOM (LDOM, <1 kDa) solutions. The fractional DOM was measured with a three-dimensional excitation-emission matrix (EEM) via fluorescence spectroscopy. A fluorescence quenching method was used to calculate the apparent stability constant (Ks) between arsenic and the fractional DOM. Based on the EEM records, three fluorescence indicators were further calculated to characterize the DOM sources, including the fluorescence index (FI), the biological index (BI), and the humification index (HI). The experimental results indicated that arsenic in the groundwater was mainly partitioned into the MDOM and LDOM fractions. All fractional DOMs contained humic acid-like substances and were considered as microbial sources. LDOM had the highest humification degree and aromaticity, followed by MDOM and HDOM. The As and DOM association could be formed by a Fe-bridge, which was demonstrated by the Ks values and fourier transform infrared (FTIR) spectra of the DOM. The formation of AsFe-DOM complex was only significant in the MDOM and LDOM. ? 2016 Elsevier Ltd. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/446337 | ISSN: | 00456535 | DOI: | 10.1016/j.chemosphere.2016.06.007 | SDG/關鍵字: | Biodegradation; Biogeochemistry; Dissolution; Fluorescence; Fluorescence spectroscopy; Fourier transform infrared spectroscopy; Groundwater; Molecular weight; Organic compounds; Quenching; Arsenic in groundwater; Dissolved organic matters; Excitation emission matrices; Fluorescence indicators; Fluorescence quenching method; Fourier transform infrared; High molecular weight; Humic acid-like substances; Arsenic; arsenic; dissolved organic matter; ground water; arsenic; ground water; humic substance; organic compound; water pollutant; arsenic; disease; dissolved organic matter; fluorescence; groundwater; humification; microbial activity; ultrafiltration; water chemistry; well water; Article; blackfoot disease; fluorescence spectroscopy; humic substance; infrared spectroscopy; molecular weight; oxidation reduction potential; Taiwan; analysis; chemically induced; chemistry; fluorescence; Foot Diseases; human; spectrofluorometry; toxicity; ultrafiltration; water pollutant; Taiwan; Arsenic; Fluorescence; Foot Diseases; Groundwater; Humans; Humic Substances; Organic Chemicals; Spectrometry, Fluorescence; Taiwan; Ultrafiltration; Water Pollutants, Chemical |
顯示於: | 農業化學系 |
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