用3种不同的样品前处理方法,即①常规湿法酸消解法、②微波加热酸消解法及③干灰化法分别对川芎样作前处理溶解,用石墨炉原子吸收光谱法(GF-AAS)测定试液中铅、铜和镉的含量,用氢化物发生-原子荧光光谱法(HG-AFS)测定试液中砷和汞的含量.结果表明:用方法①及方法③处理样品所得溶液中,铅、铜和镉的回收率在83.0%~121.0%之间,而汞和砷的回收率很低.在方法②处理样品所得溶液中,测得砷、铜、镉及汞的回收率达97.0%~127.0%之间,而铅的回收率较低,仅为51.8%.总之,方法①适合用于GF-AAS测定铅时的样品前处理,方法②宜用于HG-AFS测定汞和砷时的样品前处理,而方法③宜应用于GF-AAS测定铜及镉时的样品前处理.

The methods of ① conventional wet acid-digestion,② acid-digestion assisted by microwave heating and ③ dryashing digestion were used individually for pretreatment of chuanxiong rhizome samples.The contents of Pb,Cu and Cd in each of the sample solutions were determined by GF-AAS,and contents by Hg and As by HG-AFS.As shown by the experimental results,values of recovery of Pb,Cu and Cd found in sample solution obtained by mtthods ① and ③ were in the range of 83.0% to 121.0%,while the values of recovery of Hg and As found in the same solution were much lower.In analyzing sample solution,obtained by method ②,higher recovery values ranged from 97.0%-127.0% were found for As,Cu,Cd and Mg,but low recovery value of 51.8% was found for Pb.On the whole,the digestion method ① was suitable to be used for determination of Pb by GF-AAS,the method ② was suitable for determination of Hg and As by HG-AFS,and the method ③ was preferred for determination of Cu and Cd by GF-AAS.