Determination of ultra-trace formaldehyde in air using ammonium sulfate as derivatization reagent and capillary electrophoresis coupled with on-line electrochemiluminescence detection.

摘要: Abstract The reaction between formaldehyde and ammonium ion to produce hexamethylenetetramine is well known. conditions are very easily controlled in situ the experiment operation simple. However, such derivatization for trace determination using capillary electrophoresis (CE) electrochemiluminescence (ECL) has not been reported before. In this study, application of ammoniun sulfate as reagent in-situ air was reported. Based on ECL enhancement tris(2,2′-bipyridyl)ruthenium(II) with hexamethylenetetramine, a novel approach ultra-trace CE coupled on-line developed. parameters affecting separation detection potential, concentration pH phosphate buffer, electrokinetic voltage, were investigated. Under optimal conditions, linear range from 0.48 μg/m 3 96 mg/m (linear covering 5 orders magnitude). limit (3 σ ) 0.15 μg/m . relative standard deviations peak height migration time six consecutive injection 1 ng/mL derivative 0.9% 0.8%, respectively. recoveries 99.3% 101%.