基于梯度扩散薄膜技术原位选择性测定污染水体和自然水体中的六价铬

Synthesized N-Methyl-D-glucamine (NMDG) functional resin was incorporated into the DGT binding phase for selective measurement of dissolved CrVI in a river near sewage discharge of a electroplating industrial park, 7 regions from Lake Taihu and 5 boreholes from a known abandoned chromate production factory. The contrations of CrVI determined by DGT and total Cr in Lake Taihu were 0.06-0.36 μg L-1 and 0.98-6.40 μg L-1 respectively, lower than the national standard of drinking water. In details, CrVI concentration was highest in Zhushan bay and the concentration in North Lake was higher than Sourth Lake. The variation of CrVI concentration near the drain outlet was 0.28-0.76 mg L-1, averaged concentration measured by DGT was 0.47 mg L-1, lower than the national standard of industrial wastewater emission. The groundwater was heavily polluted by chromium, CrVI constituted 72-99% of total Cr for all 5 boreholes, the concentration of CrVI was in range of 2.22-315 mg L-1, 22-3150 times of the national standard of groundwaters. Something has to be done to cut off from source of pollution and the field site needs further remediation as soon as possible. ?????