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用库仑法监测大气中的氮氧化物,具有测量精度较高,仪器价格及维修费用低,操作简便等优点。但库仑池本身的选择性不佳,需要选择性过滤器来排除干扰气体。通常是用氧化高银作为排除 O_3的过滤剂,但这种过滤剂制备工艺复杂,并要消耗较多的贵重金属银。为此我们试制了一种新的过滤剂——酸化铬酸钡硅胶。这种过滤剂对O_3滤除效率较高,成本较低,工艺简便,同时没有吸附 NO_2的现象。
Using Coulomb method to monitor the nitrogen oxides in the atmosphere has the advantages of high measurement accuracy, low price of instruments and maintenance, easy operation and so on. However, the Coulomb pool itself is poorly selective and requires selective filters to eliminate interfering gases. Oxidation of high silver is usually used as a filter to exclude O_3, but the preparation of this filter is complex and consumes more precious silver. To this end, we tried a new filter - acidified barium chromate silica gel. This filter on the O_3 filter efficiency, lower cost, process is simple, while not adsorbed NO_2 phenomenon.