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建立了同时测定一次性纸杯中Pb、Cr、Ni、As、Sb、Cd和Ba7种重金属元素的微波消解仪-电感耦合等离子体质谱仪法。样品以硝酸和双氧水为消解液,通过微波消解仪消解样品,采用动能歧视消除模式(kinetic energy discrimination,KED)和在线引入内标溶液进行检测。检测信号(CPS)与7种重金属元素含量之间呈现良好的线性关系,相关系数R~2均>0.9997,样品回收率在85.0%~112.2%之间,相对标准偏差(RSD)小于6.46%。利用该方法分析了国家标准物质GBW10045中的7种重金属元素,所得结果与标准值基本一致。该方法具有灵敏快速和定量准确的特点,适用于一次性纸杯中7种痕量重金属元素的检测分析。
A microwave digestion instrument-inductively coupled plasma mass spectrometer (ICP-MS) was developed for simultaneous determination of seven heavy metal elements, Pb, Cr, Ni, As, Sb, Cd and Ba in paper cups. Samples were digested with nitric acid and hydrogen peroxide as digestion solutions, digested with a microwave digestion device, and kinetic energy discrimination (KED) and online introduction of internal standard solution were used for detection. There was a good linear relationship between the detection signal (CPS) and the contents of seven heavy metal elements. The correlation coefficients R ~ 2 were both> 0.9997. The recoveries were between 85.0% and 112.2%. The relative standard deviations (RSDs) were less than 6.46%. The method was used to analyze seven kinds of heavy metal elements in GBW10045. The obtained results were in good agreement with the standard values. The method has the characteristics of being sensitive, rapid and quantitatively accurate, and is suitable for the detection and analysis of seven trace heavy metal elements in disposable paper cups.