提出了电感耦合等离子体原子发射光谱法测定橡胶和塑料制品中高关注物质含钴、砷、铬、锡、铅量的方法。0.2 g试样置于消解罐中,加入硝酸5 mL、过氧化氢2 mL、氟硼酸1 mL,于215 ℃消解50 min。试验选择钴、砷、铬、锡、铅的分析谱线分别为230.786,193.696,267.716,189.927,220.353 nm。标准溶液选用硝酸-氟硼酸(5+2+93)混合溶液进行稀释以消除基体干扰。各元素的质量浓度在5.0 mg·L-1以内与其发射强度呈线性关系,方法检出限(3s)均低于3 mg·kg-1,测定下限(10s)均不大于10 mg·kg-1。方法用于标准物质(EC681K,EC681)分析,测定值与认定值相一致。方法的加标回收率在92.1%~97.4%之间,测定值的相对标准偏差(n=6)在1.1%~4.6%之间。

ICP-AES was applied to the determination of highly concerned substances, including Co, As, Cr, Sn and Pb, in rubber and plastic products. 0.2 g of sample was mixed with 5 mL of HNO3, 2 mL of H2O2 and 1 mL of HBF4 in a digestion vessel, and digested at a temperature of 215 ℃ for 50min. Analytical spectral lines of 230.786, 193.696, 267.716, 189.927 and 220.353 nm were chosen for the determination of the 5 elements respectively. Matrix interference was eliminated by dilution of standard solution with mixture of HNO3, HBF4 and H2O with the ratio of 5 to 2 to 93. Linear relationships between values of emission intensity and mass concentration of the elements were kept in the same range within 5.0 mg·L-1, with detection limits (3s) and lower limits of determination (10s) less than 3 mg·kg-1 and 10 mg·kg-1 respectively. The proposed method was applied to the analysis of 2 CRM′s (EC681K, EC681), giving results in consistency with the certified values. Tests for recovery were made by standard addition method, giving values of recovery in the range of 92.1%-97.4% with RSD′s (n=6) in the range of 1.1%-4.6%.