氢化物发生-无色散原子荧光光谱法测定乳与乳制品中痕量铅

Hydride Generation-Nondisperion Atomic Fluorescence Spectrometric Determination of Trace Amounts of Lead in Milk and Dairy Products

研究了乳与乳制品中痕量铅的断续流动氢化物发生-无色散原子荧光光谱法。在优化条件下，采用酸洗活性炭处理的铁氰化钾，降低了空白荧光信号，改善了检出限，试验了共存元素的干扰，结果表明其允许量均高于试样的存在量。样品加标回收率为92．5%-105．0％，相对标准偏差（n=6）为0．5％～3．7％，检出限为0．22μg·L^-1。

Atomic fluorescence spectrometry with intermittent flow injection-hydride generation technique was applied to the determination of trace amounts of lead in milk and dairy products. Samples were pretreated by the dry ashing method and the ignited residues were taken up with dil. HCl. Blank value and detection limit of the determination were lowered and improved by treating the potassium ferricyanide used in the hydride generation with acid-washed active carbon. Amounts of co-existing ions in samples of milk and dairy products were found to be lower than the tolerance limits tested. Detection limit （3S） was found to be 0. 22 μg · L^-1. Tests for precision, expressed as RSD＇s （n=6） and recovery on 3 different concentration levels, and values obtained were in the ranges 0. 5%- 3. 7% and 92. 5%-105. 0% respectively.