摘要
建立了可同时分析饮用水中铁、铜、镍、锌、钴、镉、锰等过渡金属离子的方法。优化后的离子色谱条件:选用Dionex IonPac CS5A色谱柱(4 mm×250 mm),以7.0 mmol/L吡啶-2,6-二羧酸+66 mmol/L KOH+74 mmol/L HCOOH+5.6 mmol/L K 2SO_(4)为淋洗液,流速为1.2 mL/min,柱温为30℃;以0.5 mmol/L 4-(2-吡啶偶氮)间苯二酚+1.0 mol/L 2-二甲醇胺+0.5 mol/L氨水+0.3 mol/L NaHCO_(3)为衍生液,流速为0.7 mL/min,紫外检测器波长为520 nm。结果表明,该离子色谱柱对以上过渡金属具有很好的保留和分离效果,衍生后的紫外检测手段具有优异的灵敏度和选择性。该方法稳定性良好,连续进样5针的相对标准偏差均小于0.79%;标准曲线线性关系良好,r≥0.9988;方法检出限低,Fe 3+为0.8μg/L,Fe 2+为4μg/L,Cu 2+为0.8μg/L,Ni 2+为3μg/L,Zn 2+为2μg/L,Co 2+为0.9μg/L,Cd 2+为16μg/L,Mn 2+为6μg/L;检测结果准确,低、中、高3个水平的加标回收率均大于91.5%。该方法适用于环境水体中过渡金属离子的定量分析。
In this paper,a method for simultaneous analysis of iron,copper,nickel,zinc,cobalt,cadmium,manganese and other transition metal ions in drinking water was established.Optimized ion chromatography conditions:Thermo Scientific Dionex IonPac TM CS5A(4 mm×250 mm),7.0 mmol/L PDCA+66 mmol/L KOH+74 mmol/L HCOOH+5.6 mmol/L K 2SO_(4) was the eluant,the flow rate was 1.2 mL/min,the column temperature was 30℃,0.5 mmol/L PAR+1.0 mol/L 2-dimethylamine+0.5 mol/L ammonia+0.3 mol/L NaHCO_(3) was used as the derivative solution.The flow rate of the derivative solution was 0.7 mL/min.The wavelength of the UV detector was 520 nm.The results showed that the ion chromatography had a good retention and separation effect on the above transition metals,and the derivated UV detection method had excellent sensitivity and selectivity.The method had good stability,and the relative standard deviation of 5 consecutive injections were all less than 0.79%.The relationship between the standard curve was good,r≥0.9988;Method detection limit was low,Fe 3+was 0.8μg/L,Fe 2+was 4μg/L,Cu 2+was 0.8μg/L,Ni 2+was 3μg/L,Zn 2+was 2μg/L,Co 2+was 0.9μg/L,Cd 2+was 16μg/L,Mn 2+was 6μg/L.The detection results were accurate,and the recovery of marking at low,middle and high levels were all greater than 91.5%.This method was suitable for quantitative analysis of transition metal ions in environmental water.
作者
吴国权
陈洁
郑洪国
赵建业
WU Guoquan;CHEN Jie;ZHENG Hongguo;ZHAO Jianye(Thermo Fisher Scientific(China)Co.,Ltd.,Guangzhou 510800,China;China Environmental Monitoring Technology Innovation Research Institute(Futian,Shenzhen),Shenzhen 518000,China)
出处
《中国环境监测》
CAS
CSCD
北大核心
2023年第S01期105-109,共5页
Environmental Monitoring in China
关键词
过渡金属离子
离子色谱
柱后衍生
紫外检测器
transition metal ions
ion chromatography
post column derivatization
UV detector
