Abstract
The applicability of CZE with mass spectrometric detection for the determination of four chlorine species, namely chloride and three stable chlorine oxyanions, was studied. The main aspects of the proper selection of BGE and sheath liquid for the CE-MS determinations of anions with high mobility were demonstrated, pointing out the importance of pH and the mobility of the anion in the BGE. The possibility of using uncoated fused silica capillary and common electrolytes for the separation was shown and the advantage of using extra pressure at the inlet capillary end was also presented. The linear range was found to be 1-100µg/mL for ClO3- and ClO4- , 5-500µg/mL for ClO2- , and 25-500µg/mL for Cl- , but the sensitivity can be greatly improved if larger sample volume is injected and electrostacking effect is utilized. The LOD for ClO3- in drinking water was 6ng/mL, when very large sample volume was injected (10000 mbar·s was applied).
Highlights
The importance of the separation and quantitative analysis of different chlorine containing species increased due to their extensive use, and they are more likely to be present in the environment, in food, or in the human body
Chlorite (ClO2−), and chlorate (ClO3−) ions can be formed in drinking water when chlorine dioxide is used for disinfection (in normal case, ß70% of the applied chlorine dioxide converts to chlorite, the chlorite concentration is less than 0.2 mg/L, but in some cases can exceed 1 mg/L,)
CE-MS is studied thoroughly, it is relatively rarely applied for the analysis of small anions with high electrophoretic mobility due to the difficulties arising during the electrophoresis
Summary
The importance of the separation and quantitative analysis of different chlorine containing species increased due to their extensive use (e.g., as disinfectants), and they are more likely to be present in the environment, in food, or in the human body. Chloride (Cl−) is very common in nature (ß2% in sea water) and in the human body (ß0.1 M in blood). Chlorite (ClO2−), and chlorate (ClO3−) ions can be formed in drinking water when chlorine dioxide is used for disinfection (in normal case, ß70% of the applied chlorine dioxide converts to chlorite, the chlorite concentration is less than 0.2 mg/L, but in some cases can exceed 1 mg/L, (e.g., in swimming pool water [1])). While chloride is a common component and an essential compound for metabolism, the other chlorine species have harmful effects on human health. Due to its high reactivity, no separation method has been applied for its determination
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
