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本文提出了用二氧化锰采集空气中汞并用冷原子吸收分析的方法。制备了本底含汞量低和穿透容量大的多孔活性二氧化锰颗粒采样管。200mg二氧化锰采气流量0.1—0.5L/min,汞的阻留率平均≥99.61％,穿透容量>93μgHg,采样后用双氧水溶解二氧化锰,再用高锰酸钾或加温法消除剩余的双氧水。精密度3.06％。检出限20.7ngHg。回归方程Y=0.00408+0.96577XHg(μg),r=0.9992,汞回收率平均为100.37％。与经典的酸性高锰酸钾法比较无差别。本法适用于汞作业和大气环境汞浓度的定点和个体监测。
This paper presents a method for the capture of mercury in air using manganese dioxide by cold atomic absorption spectroscopy. A porous active manganese dioxide particle sampling tube with low background mercury content and large penetration capacity was prepared. 200mg manganese dioxide gas flow 0.1-0.5L / min, mercury retention rate of ≥99.61% on average, penetration capacity> 93μgHg, sample digested with hydrogen peroxide dissolved manganese dioxide, potassium permanganate or heating method to eliminate Remaining hydrogen peroxide. Precision 3.06%. Detection limit of 20.7ngHg. The regression equation Y = 0.00408 + 0.96577XHg (μg), r = 0.9992, the average mercury recovery was 100.37%. No difference with the classic acid potassium permanganate method. This Law applies to fixed-point and individual monitoring of mercury concentrations in mercury operations and atmospheric environments.