摘要
矿石中高硫测定的经典方法是硫酸钡重量法,操作比较繁琐。本文对EDTA络合滴定,间接测定硫的含量作了试验,方法重现性、准确度都很好。方法原理:试样经氧化锌—碳酸钠半熔,使硫转化成可溶性硫酸盐,先用过量的氯化钡将溶液中的硫酸根沉淀完全,过量的钡在PH10时加埃铬黑T指示剂,用EDTA=钠盐溶液滴定。为了使终点明显,添加一定量的镁,因为钡与氨羧络合剂形成的络合物不如镁络合物稳定,镁起最后指示终点作用。从加入钡镁所耗EDTA的量(用空白方法求得),减去沉淀硫酸根后剩余钡镁所耗EDTA量,即可算出消耗于硫酸根的钡量,从而换算出硫的含量。
In this Paper,the titration condition has been made for the content of the titrated barium ion combined with EDTA and the content of sulphur obtained from the indirect determination,besides that an experimental research has also been made to remove the disturbing elements. Through the determination of the sulphur from the ore samples of antimony,lead,iron,loal and so on and through the comparative experiments, the author found that the relative deciation ranges from 0.3％ to 4.8％ and the determination ranges from 1％ to 50％. This method has many advantages such as simplicity,rapidity, correctness and good repe tition This method can be used to analyse and determine the total sulphur of nonmetallic ores,oil and some chemical indutrial Products so long as the samples are treated appropiaetely.
出处
《贵州科学》
1989年第1期86-88,共3页
Guizhou Science
