【摘要】 提出了石墨炉原子吸收光谱法同时测定小鼠肝中痕量Pb和Cd的方法。以8-羟基喹啉为络合剂,在pH 9.0时,用Triton X-100浊点萃取富集样品中的Pb和Cd。用NH4H2PO4作为基体改进剂测定Pb和Cd,Pb和Cd的检出限(3s/k)分别为0.103μg/L和0.0136μg/L,相对标准差(n=6)分别为1.4%,0.73%。对于10 mL样品溶液的富集倍数分别为7.1,9.3。利用该法分别测定了小鼠肝中的Pb和Cd的含量,加标回收率分别为96.4%～97.1%和101.3%～103.2%。更多还原

【Abstract】 A new method for simultaneous determination of trace amounts of lead and cadmium in mouse liver by GFAAS was proposed in this paper.Trace of Pb2+and Cd2+was extracted from the sample solution in the form of coordination complex with dithizone at pH 9.0 by cloud point extraction with Triton X-100 as a non-ionic surfactant.NH4H2PO4 was used as a matrix modifier.Detection limits for Pb and Cd were 0.103 and 0.0136 μg/L,respectively.The relative standard deviations(RSD) for six replicate determinations of Pb and Cd were 1.4% and 0.73%,with enhancement factors of 7.1(Pb) and 9.3(Cd) in 10 mL sample solution.The proposed method was successfully applied to the determination of lead and cadmium in the mouse live with the recoveries of 96.4%-97.1%,and 101.3%-103.2%,respectively.更多还原