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Development of an SPE/CE method for analyzing HAAs
Author(s) -
Zhang Li,
Capel Paul D.,
Hozalski Raymond M.
Publication year - 2007
Publication title -
journal ‐ american water works association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.466
H-Index - 74
eISSN - 1551-8833
pISSN - 0003-150X
DOI - 10.1002/j.1551-8833.2007.tb07891.x
Subject(s) - haloacetic acids , capillary electrophoresis , chemistry , chromatography , analyte , solid phase extraction , derivatization , detection limit , extraction (chemistry) , sample preparation , analytical chemistry (journal) , high performance liquid chromatography , chlorine , organic chemistry
A method to analyze haloacetic acids (HAAs) in drinking water was developed using a capillary electrophoresis (CE) ion analyzer for analyte separation and detection. The effects of background electrolyte (BGE) composition, sample injection approach, and on‐ and offcapillary preconcentration techniques on HAA peak resolution and method sensitivity were evaluated. The recommended BGE consists of 25 mM phosphate buffer at pH 5.7 with 1 mM tetradecyltrimethylammonium hydroxide as the electroosmotic flow modifier. Aqueous samples were preconcentrated using solid‐phase extraction (SPE) and then loaded onto an extended light path capillary (75‐μm inside diameter ÷ 56‐cm effective length) using pressure injection (50 mbar for 12 s). The estimated method detection limits were in the range of 1.5–3.5 μg/L. The SPE/CE method was used to analyze ambient and spiked water samples from a water distribution system, and results were in good agreement with those using US Environmental Protection Agency method 552.2. The main advantage of the SPE/CE method over the currently approved HAA analysis methods is that it does not require HAA derivatization, which involves potentially hazardous chemicals and conditions. Disadvantages of the SPE/CE method are that it does not offer a significant time savings (because of the need for off‐capillary sample preconcentration) and chlorodibromoacetic acid could not be quantified because of interference from a contaminant peak.