农田灌溉水中阴离子的色谱分析

Chromatographic Analysis of Anions in Agricultural Irrigation Water

为了高效、快速检测农田灌溉水中阴离子，建立利用离子色谱并结合固相萃取技术测定 F-、Cl-、3NO-、24SO -4种离子的方法．讨论淋洗液浓度和流量对离子保留时间和分离度的影响，并优化出最佳色谱条件．结果表明：针对此类样品，选择淋洗液浓度4.5,mmol/L Na2,CO3/0.8,mmol/L NaHCO3，流量为1,mL/min作为最优分离条件．4种离子的检出限为0.002～0.048,mg/L，精密度小于2%，回收率为93.79%～104.30%．该方法简单、可靠，适用于农田灌溉水中多种阴离子的同时测定．

For efficient and rapid detection of anions in irrigation water,a method for the determination of four anions, namely F^-,Cl^-,NO^- 3、SO^2- 4, by ion chromatography（IC）with the solid phase extraction（SPE）was established. Influences of eluent concentration and flow rate on ion retention time and resolution were discussed. Meanwhile,the chromatographic conditions were optimized as follows.The eluent is 4.5,mmol/L Na2,CO3/0.8,mmol/L NaHCO3,and the flow rate is 1,mL/min. The four anions’ detection limit is 0.002～0.048,mg/L,the precision is lower than 2%,and the recovery ranges from 93.79%to 104.30%. The method is simple,reliable and suitable for the simultaneous determination of several anions in agricultural irrigation water.