离子色谱法同时测定降水中的常见阴离子

Simultaneous Determination of Anions in Rainwater by Ion Chromatography

利用离子色谱仪同时测定降水中的3种有机酸根离子和4种无机阴离子，通过对分析条件的优化，确定了最佳的色谱条件：以4．0mmol／L Na2CO3与1．0mmol／L NaHCO3为流动相，流速0．8mL／min作等度洗脱，在10min内实现基线分离并完成电导检测．7种组分的检测限在0．5～20．0nmol／L之间，线性范围跨越2个数量级以上．该方法用于雨水样品的分析，结果表明：平均加标回收率为92．1％～106．2％，相对标准偏差0．30％～4．03％.

A method for simultaneous separation and determination of 3 organic acids and 4 anions in rainfall samples by ion chromatography coupled with conductimetric detection was proposed. The 7 analytes were separated by isocratic elution with the mobile phase of 4. 0 mmol/L Na2 CO3 and 1.0 mmol/L NaHCO3 at a flow rate of 0.8 mL/min, and were detected directly by conductimetric detector. Under the optimized conditions, the detection limits for 7 analytes were 0. 5 - 20. 0 nmol/L. The linear ranges were beyond two orders of magnitude. The analytical method had been applied to the determination of 7 anions in rainfall samples. The recovery （92. 1% -106.2% ） and RSD （0. 30% - 4. 03% ）results were obtained.