论文部分内容阅读
EDTA络合滴定法测定铅矿中的铅已广泛应用。因为铅矿中含有其他元素的情况不一,所以大都用硫酸铅沉淀法使铅与干扰元素予先分离。这种硫酸发烟的化学处理方法比较费时,且对含钡的试料不适用;在通风不良的情况下,对操作人员的身体有严重影响。为避免这种化学处理方法的缺点,我矿化验室多年来已改用硝酸——氯酸钾溶矿,并以硫酸钾使铅生成K_2SO_4·PbSO_4复盐沉淀的化学处理方法。用本法处理,矿样可以分解完全;由于硫酸铅钾沉淀的溶解度比硫酸铅小,所以铅的沉淀完全,沉淀时存在1～2毫升盐酸或硝酸不影响测定结果,但
EDTA complexometric titration of lead in lead has been widely used. Because the lead ore contains other elements in different situations, most lead sulfate and interfering elements were separated preferentially by the lead sulfate precipitation method. This method of chemical treatment of sulfuric acid fumes is time-consuming and not suitable for barium-containing samples; in the case of poor ventilation, the operator’s body is severely affected. In order to avoid the shortcomings of this chemical treatment method, I have been using chemical methods of nitrate-potassium chlorate dissolution in mine laboratories for many years and potassium sulfate to lead to K 2 SO 4 PbSO 4 complex salt precipitation. With this method of treatment, the sample can be completely decomposed; due to the solubility of lead sulfate potassium precipitation smaller than lead sulfate, lead precipitation complete precipitation of 1 to 2 ml of hydrochloric acid or nitric acid does not affect the determination of the results,