电感耦合等离子体质谱法测定卷烟用纸中铜、砷、钼、镉、铊和铅

摘要

Six metal elements, i.e, Cu, As, Mo, Cd, T1 and Pb present as impurities in cigarette paper were determined by ICP-MS.The sample was digested with HNO3, H2O2 and HF in Multiwave 3000 Microwave Digestor.Boric acid solution was added to the digested sample solution to complex with excess of HF.Mixed standard solution containing 20 μg · L-1 each of the isotopes of 115 In and 209 Bi was added as internal standard.Linear relationships in definite ranges were obtained and the detection limits (3S/N) found for the 6 elements were in the range from 0.002 to 0.16μg · L-1.Recovery was tested by standard addition method, results obtained were in the range of 95.3％ to 113.0％.Repeatability of the method was tested, giving values of RSD's (n=5) ranged from 0.9％ to 4.6％.%采用电感耦合等离子体质谱法测定了卷烟纸中铜、砷、钼、镉、铊和铅等6种杂质金属元素.试样用硝酸、过氧化氢及氢氟酸在Multiwave 3000型微波消解仪中消解处理,在所得消解后的溶液中加入硼酸溶液络合过量的氢氟酸.加入含115In及209Bi各20 μg·L-1的混合溶液作为内标.上述6种元素在一定浓度范围内与各相应的分析信号值之间呈线性关系,其检出限(3S/N)在0.002～0.16 μg·L-1之间.按标准加入法测得方法的回收率在95.3%～113.0 %之间.试验了方法的重复性,其相对标准偏差(n=5)在0.9%～4.6%之间.