分光光度法测定化肥残渣中的硫

Determination of Residues of Sulfur Fertilizer

研究化肥残渣中的有机硫和无机硫含量的测定,通过进行消化使其转化为硫酸盐,加入过量的沉淀剂使溶液中硫酸根以BaSO4沉淀析出,过量的钡离子用标准的铬酸钾溶液沉淀,用邻联甲苯胺显色,分光光度法测定过量的CrO42-,结果表明,SO42-质量在0~250μg之间服从比耳定律,平均实验测得相对标准偏差为1.73%,平均回收率为99.9%。

To study the residues of chemical fertilizers in the organic sulfur and inorganic sulfur content determination, through its digestion into sulfate by adding an excessive amount of precipitating agent so that the solution to BaSO4 sulfate precipitation, excessive levels of barium ions using a standard chromium precipitation of potassium solution, with o -tolidine color, excessive Determination CrO4^2- , results show that, SO4^2- quality between 0 - 250μg＇ s law is obeyed, the average experimentally measured relative standard deviation is 1.73% ,The average recovery was 99.9%.