CAJ | 학술논문

利用自动电位滴定仪,建立了铜合金和铜矿石中铜含量检测的一种新方法。结果表明：用二阶微商法确定滴定终点为245 mV,在预控点设置为310 mV,滴定剂硫代硫酸钠标准溶液浓度为0.01 mol/L滴定,pH在3～4之间时,加入2 mL氟化氢铵,取10 mL消解液的滴定结果较接近,且标准偏差较小,精密度高,测定结果准确。
이용자동전위적정의,건립료동합금화동광석중동함량검측적일충신방법。결과표명：용이계미상법학정적정종점위245 mV,재예공점설치위310 mV,적정제류대류산납표준용액농도위0.01 mol/L적정,pH재3～4지간시,가입2 mL불화경안,취10 mL소해액적적정결과교접근,차표준편차교소,정밀도고,측정결과준학。
Using automatic potentiometric titration instrument,a new method to examine the copper alloy and copper copper content palygorskite was established.5 kinds of titration parameters,like precontrol point setting,concentration of titrant,solution of to be tested acidity,addition amount of ammonium bifluoride and amount of testing solution were researched.Using second-order micro business method to judge titration end volume and abrupt jump potential points.At the best possible conditions,the copper alloy and copper ore content was determined by nitric acid digestion method.And make a comprehensive analysis on its precision and recovery percent.The results showed that the two order derivative method to determine the end point of titration for the 245 mV,in control point was set to 310 mV,the titration of sodium thiosulfate standard solution concentration was 0.01 mol/L titration,pH in 3~4,2 mL ammonium hydrogen fluoride,and 10 mL digestion liquid titration results were very close.The measuring result was accurate,with high precision and litter deviation.