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在分析中,有些沉淀的过滤分离需时很长,如某些氢氧化物的过滤等。而且某些沉淀因过滤时间太长,将影响分析结果的准确,如氯化银沉淀等。一般的抽气过滤大致有两种:一种是采用真空泵,一种是采用水流泵。前者不仅化钱多,而且不便于对几个试样平行过滤。同时稍不注意,抽气过大就会抽穿滤纸,造成损失。后者虽然化钱不多,但也存在三个缺点:1.无自来水就无法应用。2.几个试样平行过滤较为麻烦,甚至无法解决。3.抽滤速度很慢。如果加大自来水流量虽可以加快抽滤速度,但容易将抽气漏
In the analysis, some precipitation filter separation takes a long time, such as some of the hydroxide filter. And some precipitation due to the filtration time is too long, will affect the accuracy of the analysis results, such as silver chloride precipitation. There are two general suction filtration: one is the use of vacuum pumps, one is the use of water pump. The former is not only more money, but not easy to parallel filter a few samples. At the same time a little noticed, pumping too much air will filter through the filter, resulting in loss. Although the latter is less profitable, there are also three shortcomings: 1. Without tap water, it can not be applied. 2. Several samples parallel filtering is more troublesome, can not even be solved. 3. pumping speed is very slow. If you increase the flow of tap water can speed up the suction filtration speed, but easy to exhaust leak