石油裂解气中总汞采样方法的改进

石油裂解气中汞的形态主要有气态汞和颗粒态汞。《空气和废气监测分析方法》（第四版）,废气中汞有高锰酸钾溶液吸收法和玻璃纤维滤膜（滤筒）两种采样方法。溶液吸收法适合气态汞采样,滤膜（滤筒）采样法适合颗粒态汞采样。本文将两种采样方法串联对某石化企业的石油裂解气总汞进行监测分析,结果表明：石油裂解气中颗粒态汞与气态汞比例约为1：9;气态汞样品平行性较好,两个点位6次RSD值分别为17.2%和17.0%;颗粒态汞两个点位6次RSD值分别为25.3%和23.1%。建议对石油裂解气总汞监测采用玻璃纤维滤膜和高锰酸钾溶液吸收法串联采样。

IMPROVEMENT OF SAMPLING METHOD FOR DETERMINING TOTAL MERCURY IN OIL GAS

The mercury in the oil gas was mainly in gaseous and particle state.As there are two kinds of sampling methods for determining total mercury in pollutant monitoring in "Air and gas monitoring analysis method"(forth edition).And potassium permanganate absorption method was suit for determining particle state,while glass fiber filter canister sampling method was suit for determining gaseous state.The connection of the two sampling methods was applied in determination of total mercury in oil gas in one petrochemical enterprise.Results indicate that the ratio of particle state and gaseous state in oil gas were 1:9,and the sampling efficiency and consistency in gaseous state was better,which two separate six replicate RSD were 17.2% and 17.0%,compared with the RSD 25.3% and 23.1% in particle state.And it is better to use potassium permanganate absorption method and glass fiber filter canister sampling method connection for determining total mercury in oil gas emission monitoring.