ISSN:
1618-2650
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Notes:
Abstract A UV photo-oxidation device was constructed for the destruction of dissolved organic matter (DOM) in freshwater samples in order to determine traces of zinc, cadmium, lead and copper bound to DOM as inert species, by anodic stripping voltammetry in the differential pulse mode (DPASV). The photodigestor performance was optimised by means of the Taguchi experimental design. Four control factors (or design parameters) at three levels were explored: exposure-time to the UV-irradiation, pH of the sample, hydrogen peroxide concentration and mineral acid added, and assigned to the columns of a L9(34) saturated orthogonal array. A noise factor (nitrilotriacetic acid concentration) at three levels was introduced in the experiment to simulate the uncontrollable amount of DOM in water samples. The experiment was conducted with two replications of each trial and an optimum response insensitive to the variations of DOM concentration was found when samples, acidified at pH 2 with sulphuric acid, were irradiated for 30 min in the presence of 12.3 mmol/L hydrogen peroxide. The proposed procedure is more precise, accurate and fast than the wet digestion method.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00323176
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