应用ICP-MS直接测定原油痕量砷

Determination of Trace Arsenic in Crude Oil by Direct Sampling ICP-MS

应用ICP-MS建立了一种快速准确测定原油痕量砷的分析方法。原油样品经航空煤油稀释10~20倍后直接进入配有碰撞池的ICP-MS进行分析。优化了试验条件,考察了标准物质砷形态、内标元素等对砷结果的影响。实验结果表明,所建立的ICPMS法在0.1~50μg/kg砷浓度范围内线性良好,线性相关系数为0.9991,砷检出限为0.082μg/kg,加标回收率在98.7%~112.1%之间。与SY/T 0528相比,该方法具有操作更为简便、准确度和灵敏度更高等优点,可满足批量原油样品痕量砷的快速检测需求。

A simple and accurate analytical method for trace arsenic in crude oil by inductively coupled plasma optical emission mass sepctrometer(ICP-MS)was developed. The crude oil samples were diluted 10~20 times by kerosene, and then introduced into the ICP-MS with KED mode. The experimental conditions were optimized, and the influences of arsenic spices and internal standards were investigated. The results showed good linearity in the range of 0.1~50 μg/kg and the correlation coefficient was 0.9991.The detection limit of arsenic was 0.082 μg/kg and the sample recoveries were 98.7 %~112.1 %. Compared with SY/T 0528, the ICP-MS method has the advantages of higher sensitivity and easier to be operated, which is more suitable for the rapid demination of trace arsenic in batch crude oils.