Determination of chlorite in drinking water by differential pulse voltammetry on graphite.
The chlorite ion is an unavoidable by-product of the disinfection of drinking water by means of chlorine dioxide. The maximum concentration values of chlorite accepted in many countries' regulations range from 0.2 to 1.0 mg L(-1). A simple, inexpensive and quickly set up voltammetric procedure for the on-site determination of chlorite in drinking water networks is described. This procedure is suitable for the whole range of applications in drinking water plants. A useful cell for on-field analysis has been developed. Surface morphology and behaviour of carbon-based working electrodes have been investigated by voltammetry and atomic force microscopy (AFM). Actual samples of different types of water networks have been analysed for chlorite concentration.
Dipartimento di Chimica, Università di Firenze, Via della Lastruccia 3, 50019, Sesto Fiorentino (FI), Italy. giop@unifi.it
Giovanni
G
Pezzatini
Ilaria
I
Midili
Gabriele
G
Toti
Francesca
F
Loglio
Massimo
M
Innocenti
D002712:Chlorides / Q000032:analysis* / Q000737:chemistry*; D002852:Chromatography, Ion Exchange; D004563:Electrochemistry / Q000379:methods*; D006108:Graphite / Q000737:chemistry*; D007091:Image Processing, Computer-Assisted; D018625:Microscopy, Atomic Force; D014881:Water Supply / Q000032:analysis* / Q000592:standards
D002712:Chlorides; D006108:Graphite; C001599:chlorite