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一、前言三盐基性硫酸铅(3PbO·PbSO_4·H_2O)中三氧化硫含量一般是采用重量法进行测定,需要时间较长,往往不能满足生产上的需要。为此,我们曾试验探索了多种方法以冀多、快、好、省地解决这一问题。现在我们初步找出了一个用EDTA同时测定铅、硫的方法,既可较快地测定三氧化硫含量,又由于只称一个试样就可以同时测出铅、硫,就更省事了,比用重量法约可提高工效十倍左右(视过滤情况而定,用重量法需一天以上,现只需2～4小时即可得出结果)。比起用重铬酸钾容量法测定也要简捷一些。其准确性与重量法比较,同样能满足生产上的要求,下面列出几个平行试验的结果,以资比较:
I. INTRODUCTION The sulfur trioxide content of 3PbO · PbSO_4 · H_2O is generally determined by gravimetric method. It takes a long time and often can not meet the production needs. To this end, we have explored various methods to solve this problem in an expeditious manner. Now we have initially identified a method for the simultaneous determination of lead and sulfur by EDTA, which can not only determine the content of sulfur trioxide faster, but also measure the lead and sulfur at the same time by only one sample, With the weight of about 10 times the work efficiency can be increased (depending on the filtering conditions, using the weight method for more than one day, now only 2 to 4 hours to draw the result). Compared with the determination of potassium dichromate volume method should also be simpler. Its accuracy and gravimetric method, the same can meet the production requirements, the following is a list of several parallel test results to compare: