电感耦合等离子体质谱法同时测定口含烟中7种重金属元素

摘要

目的：建立电感耦合等离子体质谱法同时测定口含烟中铬、镍、砷、硒、镉、汞、铅7种重金属元素的含量。方法对口含烟中7种元素的测定前处理条件如消解体系、赶酸条件进行优化,并利用该方法测定58种国外市售口含烟中7种重金属的含量。结果最佳消解体系为硝酸5 mL和过氧化氢2 mL,赶酸温度为130℃。7种重金属元素在各自的线性范围内线性关系良好,相关系数均为0.9999,检出限为0.013~0.026μg/g,加标回收率为98.0%~101.8%,日内精密度 RSD<2%,日间精密度 RSD＜8%。58个样品中7个样品超出砷的限量标准1 mg/ kg,2个样品超出铅的限量标准5 mg/ kg,铬、镍、硒、镉、汞的含量均低于其限量标准。结论该方法检测限低、准确度高,可适用于口含烟中重金属元素的同时测定。%Objective To establish a method for the simultaneous determination of chromium, nickel, arsenic, selenium, cadmium, mercury and lead in oral tobacco products by inductively coupled plasma mass spectrometry (ICP-MS).MethodsThe pretreatment conditions such as digestion condition and acid removing condition were optimized, and then the content of heavy metals in 58 kinds of foreign commercial oral tobacco products was detected. ResultsTheoptimal digestion condition and acid removing condition were as follows: 5 mL nitric acid and 2 mL hydrogen peroxide, acid removing temperature at 130℃. Seven kinds of heavy metal elements had good linear relationship in respective linear ranges, the linear correlative coefficients for all elements were 0.9999. The limits of detection was in the range of 0.013~0.026μg/g and the recoveries were 98.0%~101.8%. The overall intra-day and inter-day RSD were less than 2% and 8%, respectively. Among 58 kinds of oral tobacco products, 7 samples exceeded the limit of arsenic standard 1 mg/kg, 2 samples exceeded the limit of lead standard of 5 mg/kg, and chromium, nickel, selenium, cadmium, mercury levels were lower than the limits.ConclusionThis proposed method shows higher sensitivity and accuracy, which can meet the demand for simultaneous determination of heavy metal elements in oral tobacco products.