在大批定锰时,使用较便宜和较易得到的催化剂代替硝酸银,这一问题曾屡次引起研究者的注意。最近,库茲涅佐夫(Кузнецов)和布达诺娃(Буданова)已经成功地采用了钴盐作为催化剂。为了掩蔽钴离子在滴定终点时使颜色变成难于观察的玫瑰红色,该文作者介绍同时加入铜盐或镍盐(它们的呈色与钴离子互为补色)。该文作者指出,在测定黑色金属、铜合金和铝合金中的微量锰时,钴催化剂是适用的。库里贝尔格(Кульберт)、 This problem has drawn the attention of researchers for many times due to the use of cheaper and more readily available catalysts instead of silver nitrate. Recently, Kuznetsov and Буданова have successfully used cobalt salts as catalysts. In order to mask that cobalt ions make the color a hard-to-observe rose-red at the end of the titration, the authors describe the simultaneous addition of copper salts or nickel salts whose coloring is complementary to cobalt ions. The authors point out that cobalt catalysts are suitable for the determination of trace manganese in ferrous metals, copper alloys and aluminum alloys. Кульберт,