High performance ion chromatography of haloacetic acids on macrocyclic cryptand anion exchanger.
A new high performance ion chromatographic method has been developed for the separation of the nine chlorinated-brominated haloacetic acids (HAAs) that are the disinfection by-products of chlorination of drinking water, using a macrocycle-based adjustable-capacity anion-exchange separator column (IonPac Cryptand A1). A gradient method based on theoretical and experimental considerations has been optimized in which 10 mM NaOH-LiOH step gradient was performed at the third minute of the analysis. The optimized method allowed us to separate the nine HAAs and seven possibly interfering inorganic anions in less than 25 min with acceptable resolution. The minimum concentrations detectable for HAAs were between 8.0 (MBA) and 210 (TBA) microg L(-1), with linearity included between 0.9947 (TBA) and 0.9998 (MBA). To increase sensitivity, a 25-fold preconcentration step on a reversed phase substrate (LiChrolut EN) has been coupled. Application of this method to the analysis of haloacetic acids in real tap water samples is illustrated.
Bruzzoniti
Maria Concetta
MC
Department of Analytical Chemistry, University of Torino, Via P. Giuria 5, 10125 Torino, Italy. mariaconcetta.bruzzoniti@unito.it
De Carlo
Rosa Maria
RM
Horvath
Krisztian
K
Perrachon
Daniela
D
Prelle
Ambra
A
Tófalvi
Renáta
R
Sarzanini
Corrado
C
Hajós
Péter
P
D000085:Acetates / Q000302:isolation & purification*; D002852:Chromatography, Ion Exchange / Q000379:methods*; D006878:Hydroxides; D018020:Lithium Compounds; D047028:Macrocyclic Compounds / Q000737:chemistry; D017680:Potassium Compounds; D012972:Sodium Hydroxide
D000085:Acetates; D006878:Hydroxides; D018020:Lithium Compounds; D047028:Macrocyclic Compounds; D017680:Potassium Compounds; D012972:Sodium Hydroxide; C006972:chloroacetic acid; C016274:bromoacetate; C028467:lithium hydroxide; C029943:potassium hydroxide