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5~500μg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。
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 5~500μg.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.
作者
陆美环
熊曾恒
王霞
王晟
李春芳
黄丹
周女琬
Lu Meihuan;Xiong Zengheng;Wang Xia;Wang Sheng;Li Chunfang;Huang Dan;Zhou Nyuwan(Hainan Ecological Environmental Monitoring Center,Haikou 570228,China)
出处
《山东化工》
CAS
2024年第6期161-163,167,共4页
Shandong Chemical Industry
关键词
氟离子选择电极法
土壤
水溶性氟化物
总氟化物
fluoride ion selective electrode method
soil
water soluble fluoride
total fluoride
