摘要
白酒样品加热除掉乙醇,微波消解定容,经石墨炉原子化后,在283.3 nm处测定吸光值。在一定浓度范围内的铅的吸光值与铅含量成正比。结果显示,采用标准曲线校正法测No:QC-156A-3白酒质控样品铅含量为0.262 mg/L,比质控样品中铅的指定值0.301 mg/L低12.3%;而采用标准加入校正法以消除白酒基体引入的干扰,测得铅含量为0.309 mg/L,更接近指定值。
Ethanol was removed from liquor samples by heating and microwave digestion,after atomization in graphite furnace,the absorbance value was determined at 283.3 nm. The absorbance of lead in a certain concentration range is proportional to the lead content. The results showed that the lead content of No:QC-156 A-3 liquor quality control samples was 0.262 mg/L by standard curve correction method,which was 12.3 %lower than the specified lead content of 0.301 mg/L in quality control samples;while the interference of liquor matrix was eliminated by standard addition correction method,and the lead content was 0.309 mg/L,which was closer to the specified value.
引文
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