Reductive degradation of carbaryl in water by zero-valent iron.
Reduction of carbaryl solution by zero-valent iron powder (ZVIP) was studied in a rotator batch system (70 rpm) in order to evaluate the utility of this reaction in remediation of carbamate contaminated water. Degradation with different amount of ZVIP: 0.01, 0.02, 0.03, 0.04 g/ml at pH 6.6 and at ambient temperature was investigated. The results show that the process exhibits a degradation rate appearing to be directly proportional to the surface contact area of ZVIP (325-mesh) with the carbaryl molecules. Three analytical techniques were used to monitor carbaryl degradation: (1) A UV-Vis diode array spectrophotometer was used to record all spectra. (2) A high performance liquid chromatography was used to separate by-products and examine the evolution of breakdown products. (3) A home-built spectrophosphorimeter that uses the solid surface room temperature phosphorescence (SSRTP) was employed to observe selectively the decline of the carbaryl concentration at different amount of ZVIP on Whatman no. 1 filter paper. Results show that the reducing degradation of carbaryl with ZVIP as the source of electrons is effective with a half-life close to several minutes.
Ghauch
A
A
ESIGEC-Laboratory of Chemistry and Environmental Engineering LCIE, University of Savoie, Savoie Technolac, le Bourget du Lac, France. antoine.ghauch@univ-savoie.fr
Gallet
C
C
Charef
A
A
Rima
J
J
Martin-Bouyer
M
M
D000042:Absorption; D012721:Carbaryl / Q000737:chemistry / Q000302:isolation & purification*; D002851:Chromatography, High Pressure Liquid / Q000379:methods; D002853:Chromatography, Liquid; D007306:Insecticides / Q000737:chemistry / Q000302:isolation & purification*; D007501:Iron / Q000737:chemistry; D013053:Spectrophotometry / Q000379:methods; D014874:Water Pollutants, Chemical / Q000302:isolation & purification
D007306:Insecticides; D014874:Water Pollutants, Chemical; D007501:Iron; D012721:Carbaryl