氢化物发生-原子荧光法测定污泥中的痕量汞

针对污泥中复杂基质的特点，进行了三种样品湿法消解体系、还原剂、载流等实验条件的研究，确定了HNO₃-HClO₄湿法消解体系、5%硝酸载流和0.1%硼氢化钠还原剂、以及标准和样品中5％硝酸+0.05%重铬酸钾混合溶液的酸度介质等，用以测试污泥中痕量Hg的实验条件。该方法快速、准确，易操作，检出限为0.06 μg·L-1，连续11次测定4.0 μg·L-1Hg标准溶液相对标准偏差为2.0%，实验建立的氢化物原子荧光(HG-AFS)测定污泥中痕量Hg的测试方法具有较好的应用前景。

Determinatoin of Trace Mercury in Sludge Samples by Hydride Generation-Atomic Fluorescence Spectrometry

Due to the complex matrix characteristic of sludge samples, the research on three wet digestion systems and the conditions of reducing agent, and carrier flow was carried. The experiment conditions of HNO₃-HClO₄ wet systems, namely 5% HNO₃ carrier flow, 0.1% NaBH₄ reducing agent, and acidity medium of 5% HNO₃+0.05% K₂Cr₂O₇ mixed solution, etc. were finally determined to measure the trace mercury in sludge samples. This recommended method has many advantages, such as accurate and quick detection and simple operation. The determination limit is 0.06 μg·L-1, and the relative standard deviation for 11-time determination of the solution containing 4.0 μg·L-1 Hg is 2.0%. This method for trace mercury in sludge samples by hydride generation-fluorescence (HG-AFS) can be widely used.