离子色谱法测定化肥中六种阴离子  

IC Determination of 6 Anions in Chemical Fertilizers

作　　者：吴勣[1] 孙明星[2] 高运川[1] 闵红[2] 屠虹[2] 李宁[2] 

机构地区：[1]上海师范大学环境科学系,上海200234 [2]上海出入境检验检疫局,上海200135

出　　处：《理化检验（化学分册）》2011年第1期23-26,共4页Physical Testing and Chemical Analysis(Part B:Chemical Analysis)

基　　金：国家标准制定计划部分(20091851-T-606)

摘　　要：提出了离子色谱法同时测定化肥中6种无机阴离子的方法。化肥试样经水超声浸取,采用C18固相萃取柱和Ba固相萃取柱净化,萃取液中氟离子、氯离子、亚硝酸根、溴离子、碘离子、硫氰酸根以IonPac AS18（250 mm×4 mm）为分析柱、IonPac AG18（50 mm×4 mm）为保护柱,氢氧化钾溶液梯度洗脱分离并用电导检测器同时测定了6种阴离子的含量。6种阴离子的检出限（3S/N）在0.001 2-0.013 5 mg·L^-1之间。方法的加标回收率在78.9%-103.0%之间,相对标准偏差（n=6）在0.61%-6.5%之间。Contents of 6 anions including F^-,Cl^-,NO2^-,Br^-,I^-and SCN^-,in chemical fertilizers were simultaneously determined by ion chromatography（IC）.The sample of chemical fertilizers was extracted ultrasonically with water and purified by passing through C18 and Ba solid phase extraction columns.The 6 anions in the extract were separated on IonPac AS18（250 mm×4 mm） column with IonPac AG18（50 mm×4 mm） as guard column,by gradient elution with KOH solutions of different concentrations as mobile phase and detected by conductivity detector.Values of D.L.（3S/N） found were in the range of 0.001 2-0.013 5 mg·L^-1.Tests for recovery and precision were made,giving values of recovery ranged from 78.9%-103.0%,and of RSD′s（n=6） ranged from 0.61% to 6.5%.

关 键 词：离子色谱法 化肥 阴离子 

分 类 号：O652.63[理学—分析化学]