Kagaya S, Araki Y, Hasegawa K
Department of Chemical and Biochemical Engineering, Faculty of Engineering, Toyama University, Japan.
Fresenius J Anal Chem. 2000 Apr;366(8):842-5. doi: 10.1007/s002160051582.
A determination method for lead in waste water and effluent was studied using flame atomic absorption spectrometry after preconcentration of lead by the rapid coprecipitation technique with gallium phosphate. Lead ranging from 0.5 to 50 microg was quantitatively coprecipitated with gallium phosphate from 100-150 mL sample solution (pH approximately 5). The presence of gallium phosphate did not affect the atomic absorbance of lead. Since the concentration of gallium in the final sample solution is also measurable by flame atomic absorption spectrometry at 250.0 nm without further dilution, the rapid coprecipitation technique, which does not require complete collection of the precipitate, becomes possible using a known amount of gallium and measuring the concentrations of both lead and gallium in the final sample solution by flame atomic absorption spectrometry. The 32 diverse ions tested gave no significant interferences in the lead determination. The method proposed here is rapid and has good reproducibility.
研究了一种采用火焰原子吸收光谱法测定废水和流出物中铅的方法，该方法通过磷酸镓快速共沉淀技术对铅进行预富集。在pH约为5的100 - 150 mL样品溶液中，0.5至50微克的铅与磷酸镓定量共沉淀。磷酸镓的存在不影响铅的原子吸光度。由于最终样品溶液中镓的浓度也可通过火焰原子吸收光谱法在250.0 nm处进行测量而无需进一步稀释,因此，使用已知量的镓并通过火焰原子吸收光谱法测量最终样品溶液中铅和镓的浓度，就可以实现无需完全收集沉淀的快速共沉淀技术。所测试的32种不同离子在铅的测定中没有产生明显干扰。本文提出的方法快速且具有良好的重现性。
