电感耦合等离子体原子发射光谱法测定不锈钢食具容器中12种重金属元素的迁移量

ICP-AES Determination of 12 Heavy Metal Elements Migrated from Stainless Steel Food Container

经清洗的不锈钢食具容器中加入乙酸(4+96)溶液至规定体积,煮沸30min,冷却,补充乙酸溶液至原体积,在室温浸泡24h,所得溶液用于原子发射光谱法测定其中的12种元素的含量。选择强度相对较高且干扰较少的谱线作为所测定元素的分析线,对3项仪器工作参数进行了优化,结果表明:发生器射频功率1 250W;载气流量0.6L·min-1;观测高度16mm。12种元素的质量浓度均在0.05~1.0mg·L-1范围内与其谱线强度之间呈线性关系,其检出限(3s)在0.001~0.013mg·L-1之间。对方法的回收率进行了试验,测得回收率在98.2%~104%之间,对浸出液平行测定10次,测定值的相对标准偏差均小于3.0%。

The cleaned stainless steel food container was filled with HOAc(4+96)to a definite volume and boiled for 30min.After cooling HOAc(4+96)was added to the original volume to replace loss by evaporation and the food container was soaked with the HOAc(4+96)for 24h.The solution obtained was used for ICP-AES determination of the 12 elements migrated from the stainless steel container.Based on the results of test for interferences of co-existing elements,12 spectral lines with relatively higher intensity and less interference were chosen as the analytical lines.Three working parameters for the instrument were optimized and given as follows:①RF power:1 250 W;②flow-rate of carrier gas:0.6L·min-1;and ③ height of observation:16mm.Linear relationships between values of spectral intensity and mass concentration of the 12 elements were found in the same range of 0.05 to 1.0mg·L-1,with detection limits(3s)range from 0.001 to 0.013mg·L-1.Values of recovery found by standard addition method were in the range of 98.2% to 104%.Values of RSD′s(n=10)found by replicate determination of the 12 elements in a same sample solution were all less than 3.0%.