论文部分内容阅读
提示: 工业氯化钡是用于氯碱工业除硫酸根的物料。以往分析氯化钡方法、采用铬酸钡沉淀法、测定时间长、手续繁琐。现在采用络合滴定法。测一只样品只要花10分钟就能完成。比铬酸钡法,可提高工效约六倍,而且节省一定量试剂。测定钡时,主要加进钡含量,三倍至四倍的钙、镁混合试剂,使之生成Ba—EDTA,Ca—EDTA,Mg—EDTA的混合成络效应,来提高钡的络合能力。调试样pH至10,用EDTA直接滴定钙镁钡总量,减去钙镁量,求其钡量。试剂①0.1M乙二胺四乙酸二钠。(简称EDTA)称37.23克EDTA加热溶解于约一立升水中。标定。
Hint: Industrial barium chloride is a material used in the chlor-alkali industry for sulfate removal. Barium chloride analysis of the past methods, the use of barium chromate precipitation method, the determination of a long time, procedures cumbersome. Now using complexometric titration. Measuring a sample takes only 10 minutes to complete. Than barium chromate method, can improve work efficiency about six times, but also save a certain amount of reagent. The determination of barium, the main addition of barium content, three times to four times the calcium and magnesium mixed reagents, so that the formation of Ba-EDTA, Ca-EDTA, Mg-EDTA mixed network effect to improve the barium complexation ability. Adjust the pH of the sample to 10, titrate the total amount of calcium magnesium barium with EDTA, subtract the amount of calcium and magnesium, and find the amount of barium. Reagents ① 0.1M disodium ethylenediaminetetraacetate. (Referred to as EDTA) said 37.23 g EDTA dissolved in about one liter of water heated to dissolve. Calibration.