微波灰化-电感耦合等离子体原子发射光谱法测定原油中的金属元素

采用微波灰化技术消化原油样品,并使用电感耦合等离子体原子发射光谱法(ICP-AES)测定其中Na、Mg、Ca、Fe、V、Ni和Cu的含量。探讨了原油样品中金属元素测定的称样量和微波灰化程序,并优化了仪器工作参数和实验条件。样品经微波灰化处理后,用盐酸溶解残渣,方法对Na、Mg、Ca、Fe、V、Ni和Cu元素的检出限分别为0.07、0.01、0.01、0.01、0.02、0.04和0.03mg/kg,回收率在84.5%～96.6%之间,相对标准偏差在2.1%～6.9%范围。方法简便、可靠,可用于原油中Na、Mg、Ca、Fe、V、Ni和Cu 7种金属元素的检测。

Determination of Metal Elements in Crude Oil by Microwave Ashing-Inductively Coupled Plasma-Atomic Emission Spectrometry

A determination method of Na,Mg,Ca,Fe,V,Ni and Cu in crude oil by inductively coupled plasma-atomic emission spectrometry(ICP-AES),using microwave ashing as samples pre-treatment means was established.The programs for microwave ashing and sample weight were studied.Meanwhile,the operative conditions of ICP-AES were optimized.The detection limits were 0.07,0.01,0.01,0.01,0.02,0.04 and 0.03 mg/kg for Na,Mg,Ca,Fe,V,Ni and Cu,respectively.The average recoveries were between 84.5% and 96.6%,and the RSD were between 2.1% and 6.9% for the determination of metal elements in crude oil.The method was also suitable and practicable for the determination of Pb,As and Hg in crude oil.