浊点萃取预富集火焰原子吸收光谱法测定水样中痕量镍

FAAS Determination of Trace Amount of Nickel in Water Samples with Cloud Point Extraction

以1-(2-吡啶偶氮)-2-萘酚为络合剂,在pH 7.0,用Triton X-100非离子表面活性剂浊点萃取水样中痕量镍。表面活性剂相用硝酸-甲醇(1+9)混合液0.5 mL分散,所得溶液直接引入仪器进行火焰原子吸收测定,方法的检出限(3σ)为3.77×10-3mg.L-1,应用所提出方法测定了河水样品,测定结果的相对标准偏差(n=6)为2.98%。

Trace amount of Ni（Ⅱ） was extracted from water sample in the form of coordination complex with 1-（2-pyridylazo）-2-naphthol （PAN） at pH 7. 0 by cloud point extraction with Triton X-100. The surfactant phase was dispersed in 0. 5 mL of a mixture of conc. HNO3 and methanol in the ratio of 1 to 9 by volume, and the solution was introduced directly into the nebulizer for FAAS determination. Detection limit （3σ） of the method was found to be 3.77×10^-3mg·L^-1. The proposed method was used in the determination of nickel in a sample of river water, giving value of RSD＇s （n=6） of 2.98%.