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石油中所含的砷一般均以有机胂化物形态存在,且石油炼制所得石脑油中有机胂化物沸点较低,形态复杂,因此必须进行化学前处理将各种有机胂转氧为无机砷并用稀酸抽提富集。为了避免胂或砷化物挥发损失,抽提液加热之前先加入Mg(NO_3)_2。含砷的抽提液可不必如一般测砷时采用的还原为AsH_3的方法而直接用标准曲线法进行测定。本法在进样2Oμl时,灵敏度为1.3×10~(-10)g/1％。测定石脑油中含砷5ppb至130ppb时的回收率为100±6％,砷量在1ppb至5ppb时,变差系数均小于8％。
The arsenic contained in petroleum generally exists in the form of organic arsenide, and the organic arsine in petroleum refining naphtha has a lower boiling point and a complicated morphology. Therefore, it is necessary to conduct chemical pretreatment to convert various organic arsines to inorganic arsenic And dilute acid enrichment. In order to avoid volatile loss of arsine or arsenic, Mg (NO_3) _2 is added before the extraction solution is heated. The arsenic-containing extract may not necessarily be measured by the standard curve method as it is for reduction to AsH 3 which is generally used for the determination of arsenic. The law in the injection of 2Oμl, the sensitivity of 1.3 × 10 ~ (-10) g / 1%. The recovery of naphtha in arsenic from 5 ppb to 130 ppb was 100 ± 6%, and the variation coefficients were all less than 8% when the arsenic content was from 1 ppb to 5 ppb.