【摘要】 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4.0 mmol/L Na2CO3与1.0 mmol/L NaHCO3为流动相,流速0.8 mL/m in作等度洗脱,在10 m in内实现基线分离并完成电导检测.7种组分的检测限在0.5~20.0 nmol/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%.更多还原

【Abstract】 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 Na₂CO₃ 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.更多还原