离子色谱法同时快速测土壤中的F^-,Cl^-,NO_2^-,Br^-,NO_3^-,HPO_4^(2-),SO_4^(2-)

Simultaneous Fast Determination of F^-,Cl^-,NO_2^-,Br^-,NO_3^-,HPO_4^(2-) and SO_4^(2-) in Soil Samples by Ion Chromatography

建立了离子色谱-抑制型电导检测方法同时快速测定风干土壤中的F-,Cl-,NO2-,Br-,NO3-,HPO24-,SO24-.分离柱选用Metrohm Asupp4(4×250mm),淋洗液浓度选择2.5mmol/LNa2CO3+1.7mmol/LNaHCO3,在最佳流速0.8ml/L条件下洗脱.在优化条件下该方法各种离子检测限对应为0.0016,0.0032,0.0047,0.0074,0.0076,0.0115,0.0086mg/L,土壤样品各离子测定相对标准偏差为1.24%～4.08%(n=6),加标回收率为88.9%～102.8%.该方法快速,样品前处理简单,检出限低,精密度高,测定结果可靠.

A novel method was developed for the simultaneous determination of F^-,Cl^-,NO^-2,Br^-,NO^-3,HPO^2-4 and SO^2-4 in dry soil samples by ion chromatography with a suppressed conductivity detector. The chromatographic separation was established on Metrohm A supp 4 （4×250 mm）anion exchange column,using 2.5 mmol/L Na2CO3＋1.7mmol/L NaHCO3 at 0.8 mL/min in flow rate. The corresponding detection limits for the above anions were 0.001 6 mg/L,0.003 2 mg/L,0.004 7 mg/L,0.007 4 mg/L,0.007 6 mg/L,0.011 5 mg/L and 0.008 6 mg/L,respectively,under the optimal conditions,the RSDs for the six consecutive determinations were 1.24%-4.08%（n=6）and the average recovery percentage of the sample detection ranged from 91.% to 103.1%. The method proved to be fast and effective,with simple preprocessing of soil samples,low detection limit,good precision and reliable determination results.