浊点萃取-石墨炉原子吸收光谱法测定环境水样中痕量镉的研究

Determination of Cadmium in Water Samples by Graphite Furnace Atomic Absorption Spectrometry with Cloud Point Extraction

提出了1-(2-噻唑偶氮)-2-萘酚(TAN)浊点萃取石墨炉原子吸收光谱法测定痕量镉的新方法。详细探讨了溶液pH,试剂浓度等实验条件对浊点萃取及测定灵敏度的影响。在最佳条件下,富集10mL样品溶液,用石墨炉原子吸收光谱法测定,镉的检出限为0.037μg/L,镉的富集倍率为20倍。该方法用于环境水样中痕量镉的测定,获得满意结果。

A new method for the determination of trace amount of cadmium in water by graphite furnace atomic absorption spectrometry after cloud point extraction with 1-（2,thiazolylazo）-2- naphthol was proposed. The effects of experimental conditions such as pH and concentration of reagents on cloud point extraction and determination sensitivity were discussed. The chemical variables affecting the separation phase and extraction recovery were optimized. Under the optimum conditions, pre-concentration of only 10mL of sample in the presence of 0. 05% triton X-114 permitted the detection of 0. 037μg/L （3σ） for cadmium. The enhancement factor was 20 for cadmium. The proposed method was applied to the determination of cadmium in water samples with satisfactory results.