摘要
氟是一种与健康密切相关的必需微量元素,人体对氟的摄入不足或过量都可能会引发健康问题。查明土壤中氟的赋存形态,对了解氟的生物有效性、迁移转化规律及预防氟缺乏或过剩可能导致的生态环境和健康问题具有重要意义。通过将氟的形态划分为水溶态、吸附态、氧化结合态和固定态,重点研究了固液比、超声时间、超声温度对水溶态氟的提取影响,确定了固液比1∶10、超声时间30 min以及超声温度(25±5)℃为最佳提取条件,并在此条件下,开展了弱酸(H_(2)C_(2)O_(4))、弱碱(NaHCO_(3))提取剂的先后顺序和不同浓度NH_(3)OHCl-C_(2)H_(4)O_(2)提取液对吸附态氟及氧化结合态氟提取效果的影响。结果表明,土壤的pH值对提取吸附态的氟有一定影响,确定了酸性土壤使用先碱后酸、碱性土壤使用先酸后碱的吸附态氟提取顺序;得出了使用0.25 mol/L浓度的NH_(3) OHCl-C_(2)H_(4)O_(2)提取液会使氧化结合态氟的提取率更高的结论。所使用的方法精密度RSD在3.6%~22.8%,准确度RD在0.42%~10.5%,回收率在81.0%~99.2%,均优于区域生态地球化学评价(DZ/T 0289—2015)规范的要求。方法简单有效,并易于控制,可为研究氟在土壤中的迁移转化提供科学依据。
Fluorine is an essential trace element closely related to human health,and insufficient or excessive intake of fluoride by the human body may lead to health problems.Identifying the occurrence forms of fluoride in soil is of great significance for understanding the bioavailability,migration and transformation patterns of fluoride,and preventing potential ecological and health problems caused by fluoride deficiency or excess.After discussion,the morphology of fluorine was divided into water-soluble,adsorbed,oxidized bound,and fixed states.The effects of solid-liquid ratio,ultrasound time,and ultrasound temperature on the extraction of water-soluble fluoride was focused on studied.The optimal extraction conditions were determined to be a solid-liquid ratio of 1∶10,ultrasound time of 30 minutes,and ultrasound temperature of(25±5)℃.Under these conditions,the order of weakly acidic(H_(2)C_(2)O_(4))and weakly alkaline(NaHCO_(3))extractants and the effects of different concentrations of NH_(3)OHCl-C_(2)H_(4)O_(2) extractants on the extraction of adsorbed and oxidized bound fluoride were studied.The results showed that the pH of the soil had a certain impact on the extraction of adsorbed fluoride,and the extraction sequence of adsorbed fluoride was determined based on the use of alkaline followed by acidic extractants in acidic soil and acidic followed by alkaline extractants in alkaline soil.The conclusion was drawn that using NH_(3)OHCl-C_(2)H_(4) O_(2) extraction solution with a concentration of 0.25 mol/L resulted in a higher extraction rate of oxidized bound fluorine.The RSD of the method used was ranged from 3.6%to 22.8%,the RD was ranged from 0.42% to 10.5%,and the recovery rate was ranged from 81.0%to 99.2%,all of which were better than the requirements of the regional ecological geochemical evaluation(DZ/T 0289—2015)specifications.This method is simple,effective,and easy to control.It can provide scientific basis for studying the migration and transformation of fluoride in soil.
作者
门倩妮
冯博鑫
甘黎明
黄鑫
邓攀直
何涛
MEN Qianni;FENG Boxin;GAN Liming;HUANG Xin;DENG Panzhi;HE Tao(Xi'an Center of Mineral Resource Survey,China Geological Survey,Xi'an,Shaanxi 710100,China)
出处
《中国无机分析化学》
CAS
北大核心
2024年第7期945-953,共9页
Chinese Journal of Inorganic Analytical Chemistry
基金
自然资源综合调查指挥中心科技创新基金资助项目(KC20220023)
国土空间生态环境地质调查及修复联合资助项目(DD20208079)。
关键词
土壤
氟
化学形态分析
soil
fluorine
chemical speciation analysis
