Standard solution

Determination of SeO_2 in industrial selenium dioxide by sodium hyposulfite titration;

硫代硫酸钠滴定法测定工业二氧化硒中SeO_2

Determination of Phosphorus in Soil Samples by Oscillopolarographic Titration;

示波极谱滴定法测定土壤中的磷

Rapid titration of manganese dioxide content in pyrolusite;

软锰矿中二氧化锰含量的快速滴定

Conceal disturbing elements like iron,copper,lead with hydrogen fluoride amine-EDTA,add the potassium iodide to separate iodine, and take starch as indicator,titrate with sodium hyposulfite.

试样以王水分解、泡塑富集分离金,硫脲解脱,以硝酸-硫酸破坏硫脲,用氟化氢胺-EDTA掩蔽铁、铜、铅等干扰元素,加碘化钾使之析出碘,以淀粉为指示剂,用硫代硫酸钠进行滴定。

This paper writes adout VB program of alkali titrate weakacid, draws the conclusion of mathe-matical modei of that prcgram, discusses the approaches of the modei and shows the results of applying VB program to practical cases.

用Visual BaSic程序设计语言设计编制了模拟强碱滴定弱酸的程序,推导了建立模拟强碱滴定弱酸程序的数学模型,讨论了模拟的处理思路,并给出了程序对实例的处理结果。

Due to different stability constants between barium chlorophosphonazo Ⅲ and other compound of bariate,sulfate was titrated by barium chloride standard solution using chlorophosphonazo Ⅲ as indicator when pH value was 17.

介绍了在洗衣粉中含有三聚磷酸钠、4A沸石、硅酸盐和碳酸盐等无机盐与SO42-共存的情况下,经过特殊化学处理后,基于Ba2+与偶氮氯膦Ⅲ形成络合物的稳定常数和其他钡盐的差异,在pH=1 7,以偶氮氯膦Ⅲ为指示剂,用氯化钡标准溶液直接滴定硫酸根。