汞观测中干扰因素的研究

本文通过实验及机理的分析研究表明：１．测汞仪气路中硅胶管对汞的的吸附水平受其本身温度的影响。温度升高，吸附汞的能力下降，释放其吸附汞的速度加快。在一定的温度下，硅胶管存在一个管内吸附汞与通过其中的气体中汞的释放和吸附的平衡；２．观测室温度的变化，除通过影响仪器气路（如硅胶管等）的温度百而影响观测结果外，主要是影响观测测室内壁汞进入空气的量，而影响空气汞本底，严重时可引起本底值值发生数十位的变化；３

STUDY ON INTERFERENCE FACTORS IN Hg OBSERVATION

Based on the experiments and analysis of mechanism, some main points are presented as follows:1. In the flow path of the Hg measuring instrument, the level of its absorbed Hg affect by the temperature of silica-gel pipe. The temperature increase, the capacity to absorb Hg decreased while the release rate of its desorbed Hg was accelerated. At a certain temperature, a dynamic balance of absorption-desorption of the absorbed gaseous Hg would lie in silica-gel pipe.2. The change of temperature in the laboratory not only affected the experimental results indrectly through such a flow path(such as silica-gel pipe)but also had serious interference with the background value of Hg in-air.3. The temperature in laboratory affect Hg observation, there might be positive correlation with variation of temperature and degree of Hg pollution in laboratory.4. The rate of Hg absorption of silica-gel pipe was in positive proportion to its length.5. The effect of humidity on observed Hg value was below 20%. Finally, the optimized observational conditions were given.