固相萃取-离子色谱法同时测定土壤中7种有效阴离子
Applied Chemical Industry(2013)
Abstract
采用固相萃取-离子色谱法同时快速检测土壤中F-、Cl-、NO2-、Br-、SO42-、NO3-、PO43-7种有效阴离子的含量。将样品溶解后,超声振荡30 min,离心。上清液过0.22μm滤膜,用DIONEX OnGuardⅡP和RP固相萃取柱净化。用15~50 mmol/L的KOH溶液梯度淋洗,流速为1.0 mL/min,采用AS11-HC型阴离子色谱柱进行分析。在此条件下,7种阴离子检出限(3 s/k)分别为0.20,0.40,0.60,0.80,0.80,1.60,0.10μg/g,相对标准偏差(n=7)为1.3%~4.3%。加标回收率为90.0%~106.0%,该方法简单、快速、结果可靠。
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Key words
solid phase extraction,seven kinds of effective anions,IC,soil
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