接装纸中As含量测定微波消解条件的选择

Selection of Microwave Digestion Conditions for Determination of Arsenic Content in Tipping Paper

为了采用微波消解和氢化-原子荧光光谱法(HG-AFS)法准确测定卷烟接装纸中As含量,研究了消解体系、消解程序和赶酸程度,以及微波仪的类型等对接装纸中As测定量的影响。结果表明:①在微波条件下,HNO3∶HF∶HCl∶H2O2体积比=6∶0.2∶1∶1的体系可将接装纸样品消解完全;②As的检出限为1.38 ng/L,回收率98%～110%,RSD为6%～10%;③Berghof和CEM两种消解仪的消解效果基本一致。

In order to accurately determine As in tipping paper samples by HG-AFS with microwave digestion,the effects of digestion system,digestion procedure,acid removal and type of microwave instrument on As determination were investigated.The results showed that： 1） tipping paper samples were completely digested in HNO3∶HF∶HCl∶H2O2=6∶0.2∶1∶1（v/v） system in a microwave field;2） the recoveries of As was from 98% to 110% with RSD of 6% to 10% and detection limit of 1.38 ng/L;3） the performance of microwave instrument Berghof was virtually the same as that of CEM.