CAJ | 학술논문

提出实验室用电位滴定测定水中高锰酸盐指数的方法。在国标法的基础上研究及优化了标定方法和实验方法,用电位滴定仪测定水中高锰酸盐指数,方法的检出限约为0.15mg/L,测定下限为0.60mg/L。实验证明,标准样品测量值均在推荐值范围内,对0.6mg/L,5.0mg/L,8.0mg/L浓度的NaC2O4标准溶液进行5次测定,得到的相对标准偏差分别为1.59%,0.97%,0.73%。在做低浓度的水样时,高锰酸钾溶液的浓度可以选择0.005mol/L。
제출실험실용전위적정측정수중고맹산염지수적방법。재국표법적기출상연구급우화료표정방법화실험방법,용전위적정의측정수중고맹산염지수,방법적검출한약위0.15mg/L,측정하한위0.60mg/L。실험증명,표준양품측량치균재추천치범위내,대0.6mg/L,5.0mg/L,8.0mg/L농도적NaC2O4표준용액진행5차측정,득도적상대표준편차분별위1.59%,0.97%,0.73%。재주저농도적수양시,고맹산갑용액적농도가이선택0.005mol/L。
The potentiometric titration method for laboratory determination of permanganate index in water was developed. Based on the GB/T11892-89, the methods of calibration and experiment process were studied and optimized. The detection limit and lower limit of the potentiometric titration method were 0. 15 and 0. 60mg/L respectively. The experimental results showed that all the values of standard samples were within the permission range. The NaC2 04 standard solutions with concentrations of 0. 6, 5. 0 and 8. 0mg/L were determined for five times, obtaining relative standard deviations of 1.59%, 0. 97% and 0. 73% respectively. For water samples with low concentration, 0. 005mol/L potassium permanganate solution was suggested to prepare.