流动注射在线螯合树脂双柱预富集火焰原子吸收法测定痕量铜、铅、镉和锰

Flow Injection On-line Double Micro column with Chelating Resin Pre-concentration System for Cu,Pb,Cd and Mn Determination by FAAS

本文采用流动注射在线阳离子螯合树脂双柱预富集 火焰原子吸收法 ,测定了痕量的铜、铅、镉和锰 ,灵敏度分别提高 33、5 0、37和 2 9倍 ,分析速度为 6 0次·h-1;对于 0 0 5 μg·mL-1Cu2 +、0 2 5 μg·mL-1Pb2 +、0 0 2 5 μg·mL-1Cd2 +和 0 0 5 μg·mL-1Mn2 +溶液 ,测定的相对标准偏差分别为 2 2 1%、3 2 4%、1 93%和3 6 6 % (n =11) ;对标准物质 (人发、小麦及猪肝 )进行了测定 ,结果与标准值相符。此法应用于饮用水和环境水样中铜、铅、镉和锰的测定 ,获得了满意的结果。

Trace amounts of copper, lead, cadmium and manganese were determinated using a flow injection on-line double chelating resin column pre-concentration FAAS system. The average measurement sensitivities for Cu2+, Pb2+, Cd2+ and Mn2+ increased by factors of 33,50,37 and 29 respectively. Sampling frequency was 60 h(-1). Relative standard deviations were 2.21%,3.24%,1.93% and 3.66% (n = 11) for Cu2+, Pb2+, Cd2+ and Mn2+ respectively. For the national standards (human hair samples, wheat sample and pork liver) the measurement results agreed with the certified values. The method was successfully applied to determinate trace amounts of Cu2+, Pb2+, Cd2+ and Mn2+ species in drinking water and environment water samples.