氟离子选择电极法测定土壤中水溶性氟化物和总氟化物含量
Determination of Water Soluble Fluoride and Total Fluoride Content in Soil Using Fluoride Ion Selective Electrode Method
陆美环 1熊曾恒 1王霞 1王晟 1李春芳 1黄丹 1周女琬1
作者信息
- 1. 海南省生态环境监测中心,海南海口 570228
- 折叠
摘要
采用氟离子选择电极法测定土壤中水溶性氟化物和总氟化物.结果表明,氟化物含量在5～500 µg范围内具有良好的线性关系(＞0.999),水溶性氟化物方法检出限为0.5 mg/kg,相对标准偏差(RSD,n=6)为3.8％～6.7％,总氟化物方法检出限为43 mg/kg,相对标准偏差(RSD,n=6)为4.0％～4.2％,满足标准方法的测定要求.有证标准物质RMU044和RMU045测定结果均在标准范围内,水溶性氟化物相对误差为-3.3％～-2.4％,相对标准偏差为4.0％～4.7％,总氟化物相对误差为0.9％～1.3％,相对标准偏差为1.0％～2.2％.实际样品加标回收率试验时,水溶性氟化物平均加标回收率为100％,总氟化物的平均加标回收率为94％,该实验方法重现性好,准确度高,操作简单.
Abstract
This paper uses the fluoride ion selective electrode method to determine water soluble fluoride and total fluoride in soil.The results showed that there was a good linear relationship(＞0.999)between the fluoride content in the range of 5～500 μg.The detection limit of water soluble fluoride method was 0.5 mg/kg,the relative standard deviation(RSD,n=6)was 3.8％～6.7％,the detection limit of total fluoride method was 43 mg/kg,and the relative standard deviation(RSD,n=6)was 4.0％～4.2％,meeting the determination requirements of the standard method.The determination results of certified reference materials RMU044 and RMU045 are both within the standard range.The relative error of water soluble fluoride is-3.3％～-2.4％,the relative standard deviation is 4.0％～4.7％,the relative error of total fluoride is 0.9％～1.3％,and the relative standard deviation is 1.0％～2.2％.In the actual sample spiking recovery test,the average spiking recovery rate of water soluble fluoride was 100％,and the average spiking recovery rate of total fluoride was 94％.This experimental method has good reproducibility,high accuracy,and simple operation.
关键词
氟离子选择电极法/土壤/水溶性氟化物/总氟化物Key words
fluoride ion selective electrode method/soil/water soluble fluoride/total fluoride引用本文复制引用
出版年
2024
NETL
NSTL
万方数据