"Determination Of Monochloroacetic Acid Using A Flow Injection System Featuring A Flow Through Ion-selective Electrode And An Ion-exchange Column For The Minimization Of Interference By Chloride."
Anal. Chim. Acta
1998 Volume 359, Issue 3 Pages 311-320
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C. Puig-Lleixà, J. Bartrolía, M. del Valle*, D. Montlló and A. Tomico
Abstract:
An automated flow injection system for online monitoring of monochloroacetic acid (I) in industrial processes for the prodn. of zwitterionic surfactants (betaines) was developed, which can treat samples with chloride ion concentration. up to 1 M. The system features an ion-exchange column for the separation of I from the interfering compounds in the complex sample. The sample is injected at low pH so that interfering anions, mainly Cl-, are retained in the ion-exchange column. Detection was carried out using specially constructed all-solid-state tubular flow-through ion-selective electrodes sensitive to monochloroacetate. Selectivity data of the constructed electrodes were given; their pH working range was 4.0-11.0, with a lifetime of >30 days at a concentration. of 10^-4 to 10^-1 M. Once applied to the treatment of real samples, the system developed can detect I at concentrations. 5 x 10^-3 - 10^-1 M, with a max. deviation of 5% when compared to standard photometric methods of anal. The short time used in each determination (30 s) in addition to its simplicity, leads to an improvement of available anal. techniques.
Monochloroacetic acid
Interferences
Selectivity
Method comparison
