首页|离子色谱-安培法检测地下水中的溴离子及碘离子

离子色谱-安培法检测地下水中的溴离子及碘离子

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建立了在 ICS5000+型离子色谱仪上同时测定地下水中溴离子与碘离子的方法,选择参数:AS19 色谱柱,45 mmol/L NaOH淋洗液,进样量 25 μL,流速 1.5 mL/min,电化学检测器,工作电极配置银电极,参比电极为氯化银电极,积分-安培检测法模式,波形选择器中施加的循环电位波形选择"Silver,Ag-AgCl RE,S2-,CN,I-,S2 O32-,Alkaline".在此条件下测定有证标准物质 GSB 07-1380-2001 205406(水质溴化物)相对误差 3.9%,GBW09113h(水中碘)相对误差5.8%.测定溴离子定量限 6.0 μg/L,碘离子定量限 1.0 μg/L;溴离子加标回收率为 104.0%,碘离子加标回收率为95.0%;测定溴离子精密度 3.0%,碘离子精密度 2.1%;可以在 10 min内完成检测.探讨了电化学检测器检测效果的影响因素,这些结论在实验中较实用却少见报道.建立的方法不受水样中其他主要阴离子(如氯离子)的干扰,方法选择性高;检出限可以达到 μg/L级别,且分析时间短.该方法能满足地下水及其他环境水样品中溴和碘离子测定要求,弥补了现有标准方法的不足.
Determination of Bromide and Iodide Ions in Underground Water by Amperometric Detection on Ion Chromatography
A method for simultaneous determination of Br-and I-was established by ion chromatography-ICS5000+.The separation of anions was achieved on an IonPac AS19 Column.45 mmol/L NaOH was used as eluent.Injection volume was 25 μL and flow rate was 1.5 mL/min.And Ag-AgCl was electrode on electrochemical detector."Silver,Ag-AgCl RE,S2-,CN,I-,S2 O32-,Alkaline"waveform was applied on integrated amperometric detector.Determination of national standard substance GSB 07-1380-2001 205406 and GBW09113h showed that the relative error was Br-3.9%,I-5.8%.This method's detection limit was Br-6.0μg/L,I-1.0μg/L;Standard recovery rate was Br-104.0%,I-95.0%;Relative standard deviation was Br-3.0%,I-2.1%.This method could be completed in 10 min.Some influence factors on amperometric detection were also discussed,which is helpful in experiment but rarely reported.This method is more selective,and will not interfered by other main anions such as chloridion.Detection limit is as low as micrograms per liter,and analysis time is short.This method is suitable for the requirements of determination of bromide and iodide ions in underground water and other environmental water.It makes up for the shortcomings of the existing standard methods.

ion chromatographyunderground waterbromide ioniodide ionelectrochemical detector

于汀汀、孙红宾、赵怀颖、朱云

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国家地质实验测试中心,北京 100037

离子色谱 地下水 溴离子 碘离子 电化学检测器

中国地质调查局地质调查项目中国地质科学院基本科研业务费项目

DD20230546CSJ-2022-09

2024

中国环境监测
中国环境监测总站

中国环境监测

CSTPCD北大核心
影响因子:1.761
ISSN:1002-6002
年,卷(期):2024.40(5)