大气中二氧化硫的无汞比色法

DETERMINATION OF SULFUR DIOXIDE IN ATMOSPHERE BY COLORIMETRIC METHOD WITHOUT MERCURATE

本文通过实验,分别用缓冲甲醛水溶液(甲法)和四氯汞钾液(乙法〕作为吸收液,对测定大气中的二氧化硫含量进行了比较,无论是方法的灵敏度和准确度甲法都可与乙法媲美。而且在样品吸收液对时间的稳定性上,甲法远比乙法稳定。这对在野外采样需要保持一定时间后才能分析的情况下更突出了它的优点。由于使用无汞试剂对监测人员和环境都无害处。

For determination of sulfur dioxide in atmosphere, the buffered formaldehyde is used as an absorbent solution (Method A) in contrast with the method usually used with potassium tetrachloromecurate as adsorbent solution (Method B).Experimental results show that the sensitivity and accuracy in method A are comparable to those in method B, and the stability of the absorbent solution used in method A is better than that used in method B. Perhaps this is the super-eminent advantage of method A over method B because the sample taken from field must be retained for a time before analysis. Moreover, the reagent used in method A is non-mercurate, so it is innocent of poison for environment and monitor.