浊点萃取预富集-火焰原子吸收光谱法测定环境水中锌

Determination of zinc in environmental water by flame atomic absorption spectrometry after cloud point extraction

锌离子和1-（2-吡啶偶氮）-2-萘酚（PAN）反应生成疏水性的络合物，被萃取到Triton X-100非离子表面活性剂胶束相中，用火焰原子吸收光谱法测定相中的锌，建立了浊点萃取预富集一火焰原子吸收光谱法测定锌的方法。影响络合反应和相分离的各种条件被优化，在选择的实验条件下，锌的质量浓度在0～3．0μg／mL范围内与吸光度呈线性关系，方法的检出限为0．86μg／L，对锌浓度为0．0132μg／mL的样品溶液进行6次平行测定，相对标准偏差为2．8％。该方法用于管网水中痕量锌的测定，回收率在96．4％～102％之间。

After zinc ion reacted with 1-（2-pyridine azo）-2-naphthol （PAN） to form a hydrophobie complex, the complex was extracted into Triton X-100 non-ionic surfactant micelle phase, and then zinc in the phase was determined by flame atomic absorption spectrometry, so that a cloud point extraction-flame atomic absorption spectrometry for the determination of zinc in environmental water was developed. Various conditions influencing complexing reaction and phase separation were optimized. Under the selected experimental conditions, there was a linear relationship between absorbanee and zinc eoneentration in the range of 0--3.0 μg/mL. The detection limit of this method was 0. 86 μg/L. The RSD was 2. 8% for six determination of 0. 013 2μg/mL zinc. This method has been applied to the determination of trace zinc in water with the recovery of 96.4%-102%.