Peldszus S, Huck P M, Andrews S A
NSERC Chair in Water Treatment, Department of Civil Engineering, University of Waterloo, Ontario, Canada.
J Chromatogr A. 1998 Jan 9;793(1):198-203. doi: 10.1016/s0021-9673(97)00854-6.
In this research, a recently developed ion chromatography method for organic acids was expanded to include oxalate. A major challenge was that oxalate elutes between inorganic anions such as sulfate, phosphate, bromide and nitrate, which are often present in much higher concentrations than oxalate. Optimization of the previously reported method made it possible to determine oxalate in these matrices. However, for those samples in which higher inorganic anion concentrations caused the oxalate peak to be obscured, a "heart-cut" column switching technique was used as an alternative. The method detection limit for oxalate was 9 micrograms/l with the direct approach and 6 micrograms/l for the "heat-cut" technique. These modifications represent a valuable supplement to a recently developed method for monitoring ozonation by-products in drinking water.
在本研究中，一种最近开发的用于分析有机酸的离子色谱方法得到扩展，以纳入草酸盐。一个主要挑战是草酸盐在诸如硫酸盐、磷酸盐、溴化物和硝酸盐等无机阴离子之间洗脱，而这些无机阴离子的浓度通常比草酸盐高得多。对先前报道方法的优化使得在这些基质中测定草酸盐成为可能。然而，对于那些无机阴离子浓度较高导致草酸盐峰被掩盖的样品，采用了“中心切割”柱切换技术作为替代方法。直接法测定草酸盐的方法检测限为9微克/升，“中心切割”技术为6微克/升。这些改进是对最近开发的用于监测饮用水中臭氧化副产物方法的宝贵补充。
