【摘要】 研究了浊点萃取-石墨炉原子吸收光谱法(GFAAS)测定痕量镉的新方法,利用表面活性剂Triton X-100和络合剂1-(2-吡啶偶氮)-2-萘酚(PAN)对镉进行浊点萃取。详细探讨了影响浊点萃取及测定灵敏度的因素。优化条件为:0.25 mL 30%NaC l,pH 8.5,0.50 mL、4.0×10-4mol/L PAN,0.2 mL 1.0%TritonX-100。在最佳条件下,镉的富集倍率为50倍,检出限为5.9 ng/L,RSD为2.1%。该方法用于环境样中痕量镉的富集和测定,结果令人满意。更多还原

【Abstract】 A new cloud point extraction（CPE） separation/preconcentration of trace level of cadmium as a（prior） step to its determination by graphite furnace atomic absorption spectrometry（GFAAS） has been developed.The CPE method was based on employing Triton（X-100） as hydrophobic ligand and nonionic surfactant and 1-（2-Pyridylazo）-2-Naphthol（PAN） as complexing reagent.The chemical variables affecting CPE were evaluated,optimized.The optimum conditions are 0.50 mL 4.0×10⁴ mol/L PAN,0.20 mL 1.0 % Triton（X-100）,0.25 mL 30 % NaCl.Under the optimum conditions,the limit of detection of 5.9 ng/L（3σ） for（cadmium） with the enhancement factor of 50 and relative standard deviation of 2.1%（n=11,c=2.0 μg/L）.The proposed method was applied to the determination of cadmium in environmental samples with satisfactory result.更多还原