薄膜扩散梯度技术测量砷的影响因素及其应用

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Abstract

Influences of environmental factors on the measurement of dissolved arsenic (As) using Zr-oxide diffusive gradient in thin films technique (Zr-oxide DGT) were systematically investigated in the laboratory, and this technique was applied for in situ determination of dissolved As in natural water. After 16-d exposure of numerous inorganic anions, the presence of SO₄²^- had no influence on the measurement of As using Zr-oxide DGT, while HCO₃^-, Cl^-, SiO₃²^- and humic acid had negative effects, with the largest tolerant concentrations of 360mg/L, 45g/L, 100mg/L and 36mg/L, respectively. The dynamical uptake showed that there were no influences of HCO₃^-(37~148mg/L), SO₄²^-(1.44~2.88g/L), Cl^-(12~24g/L), SiO₃²^-(8~24mg/L) and humic acid (3~9mg/L) with the exposure time span from 1 to 4d, while the uptake of As to Zr-oxide DGT, particularly As (III), were inhibited by high concentrations of HCO₃^-(370mg/L), SO₄²^-(8.64g/L), Cl^-(72g/L) and humic acid (27mg/L) at the exposure time of 3~4d, and SiO₃²^-(72mg/L) at the exposure time of 2~4d. The Zr-oxide DGT sampling technique was applied to water in Nanjing City in comparison with the conventional monitoring technique. The DGT-measured concentrations of dissolved As were in line with those by the conventional monitoring technique.

Key words： diffusive gradient in thin films (DGT) technique Zr-oxide arsenic (As) inorganic anions humic acid water body

Received: 30 September 2015

PACS:

X703

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http://manu36.magtech.com.cn/Jweb_zghjkx/EN/ OR http://manu36.magtech.com.cn/Jweb_zghjkx/EN/Y2016/V36/I5/1482

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