电位滴定法测定土壤中水溶性氯离子
Potentiometric Titration Method for the Determination of Water-Soluble Chloride Ions in Soil
赖波 1王福林1
作者信息
- 1. 四川省冶金地质勘查局六0五大队,四川眉山 620860
- 折叠
摘要
建立了电位滴定法测定土壤中水溶性氯离子含量的方法.通过对浸提温度、pH值、干扰消除等条件进行详细试验,确定最佳的测定条件:土样于 25℃下加水振荡后,加入适量硝酸消除碳酸根、硫离子的影响,使pH在 3.0～5.0.此方法土壤水溶性氯离子的检出限为 0.002 g/kg,精密度(RSD,n=7)为 1.7%～4.8%,准确度(RE)为-0.3%～1.5%.方法准确可靠,满足《第三次全国土壤普查全程质量控制技术规范》要求.本方法克服了传统滴定法对于色度严重的样品终点难以判断的缺点,具有普遍适用性,易于推广使用.
Abstract
A potentiometric titration method is established to determine the content of water-soluble chloride ions in soil.Through detailed experiments on extraction temperature,pH value,interference elimination,etc.,the optimal determination conditions are determined:the soil sample is shaken with water at 25℃,and an appropriate amount of nitric acid is added to eliminate the influence of carbonate and sulfate ions,maintaining the pH at 3.0 to 5.0.The detection limit of water-soluble chloride ions in soil by this method is 0.002 g/kg,the precision(RSD,n=7)is 1.7%to 4.8%,and the accuracy(RE)is-0.3%to 1.5%.The method is accurate and reliable,meeting the requirements of the Technical Specifications for Quality Control of the Third National Soil Survey.This method overcomes the drawback of traditional titration methods in which it is difficult to determine the endpoint of samples with severe coloration,and it is generally applicable and easy to promote.
关键词
电位滴定/土壤/水溶性氯离子Key words
potentiometric titration/soil/water-soluble chloride ions引用本文复制引用
出版年
2024
NETL
NSTL
万方数据