氢化物发生-原子吸收光谱法测定土壤中铅  

Determination of lead in soil by hydride generation-atomic absorption spectrometry

作　　者：胡存杰[1] 

机构地区：[1]桂林理工大学化学与生物工程学院,广西桂林541004

出　　处：《冶金分析》2013年第9期61-64,共4页Metallurgical Analysis

摘　　要：土壤样品经HCl-HNO3处理后，在盐酸介质中用铁氰化钾为氧化剂将Pb抖氧化为Pb4＋，然后在盐酸浓度为5％（V／V）的载液中，以硼氢化钾为还原剂，采用氢化物发生一原子吸收光谱法测定了铅的含量。结果表明，在选定的实验条件下，铅量在0．5～60ng／mL范围内线性关系良好，方法检出限为0．24ng／mL。方法用于土壤标准物质中铅含量的测定，测定值与认定值相符，相对标准偏差（n=5）为1．8％～4．5％。对实际样品进行加标回收试验，回收率为92％～97％。After treating the soil sample with HC1-HNO3, Pb2＋ was oxidized to Pb4＋ in hydrochloric acid medium with potassium ferricyanide as oxidizing agent. Then, the content of lead was determined by hydride generation-atomic absorption spectrometry with potassium borohydride as reducing agent in 5 % （V/V） hydrochloric acid carrier liquid. Under the selected experimental conditions, the results showed that the content of lead showed good linearity in range of 0.5-60 ng/mL. The detection limit of the method was 0.24 ng/mL. The proposed method was applied to determination of lead content in soil certified reference material. The results were consistent with the certified values. The relative standard deviations （RSD, n= 5） were 1. 8%-4. 5%. The recovery test of actual sample was per- formed, and the recoveries were between 92% and 97%.

关 键 词：铅 土壤 氢化物发生 原子吸收光谱法 

分 类 号：O657.31[理学—分析化学]