对两种阴离子分离柱(AS 17-C和AS 19)在大体积进样(500 μL)离子色谱法测定发电机组蒸汽中8种痕量阴离子中的分离效果做了试验和比较。现场取得的水样经滤膜过滤后直接进样,分别经上述两柱分离,并用不同浓度的氢氧化钾溶液作为流动相进行梯度淋洗,用抑制电导检测器检测。8种阴离子的质量浓度均在5~50 μg·L-1范围内呈线性,检出限(3S/N)分别在0.07~0.73 μg·L-1,0.08~1.9 μg·L-1之间。用标准加入法做回收试验,测得回收率在99.6%~104%(AS 17-C柱)和98.0%~103%(AS 19柱)之间。

The efficiency of 2 different anion separation columns (i.e., AS 17-C and AS 19) used in the IC determination of 8 trace anions with large volume sample introduction (500 μL) was studied comparatively. The water sample taken from worksite was filtered on membrane and introduced directly into the instrument. Separation of the 8 anions was performed separately on the 2 columns. KOH solutions with various concentrations were used as mobile phase in the gradient elution, and inhibitory conductivity detection was adopted in IC-analysis. Linearity for the 8 anions was found same in the range of 5-50 μg·L-1, while the detection limits (3S/N) found were in the ranges of 0.07-0.73 μg·L-1 and 0.08-1.90 μg·L-1 for the 2 columns respectively. Values of recovery found by standard addition method were in the ranges of 99.6%-104% (for AS 17-C) and 98.0%-103% (for AS 19).