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研究了用冷原子荧光法测定石油裂解气相产物中痕量砷的方法。将裂解气依次通过KOH和AgNO_3溶液进行吸收,然后使吸收液合并或分别处理,并发生AsH_3,再用标准汞溶液吸收。用冷原子荧光法测量吸收前后标准汞的荧光读数差,即可间接求出气相产物中的有机胂和无机砷。方法灵敏度较高,可以比较满意地测定裂解气相产物C_2或C_3中的痕量砷。
A method for the determination of trace arsenic in petroleum pyrolysis gas products by cold atomic fluorescence spectrometry was studied. The cracked gas was sequentially absorbed by KOH and AgNO 3 solution, and then the absorbers were combined or treated separately and AsH 3 was generated, which was then absorbed by a standard mercury solution. By using cold atomic fluorescence spectrometry to measure the difference of fluorescence readings of standard mercury before and after absorption, the organic arsine and inorganic arsenic in the gas phase product can be obtained indirectly. The method has high sensitivity and can be used for the determination of trace arsenic in the cracked gaseous products C_2 or C_3 satisfactorily.