Photocatalytic oxidation technique using TiO2 for detoxification of fenitrothion and diazinon residues in water | ||
| Journal of Pest Control and Environmental Sciences | ||
| Volume 20, Issue 1, 2012, Pages 19-29 PDF (3.15 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpces.2012.462314 | ||
| Authors | ||
| T. A. Adam* ; M. A. Abd-elbaki; E. A. El-Banna; T. A. Madeeh | ||
| Pesticide Department, Faculty of agriculture, Kafr Elsheikh University | ||
| Abstract | ||
| An oxidation photo catalytic technique in the presence and absence of titanium dioxide (TiO2 as photo catalysts was used for the detoxification of diazinon and fenitrothion in water. Both insecticides were used at 5 ppm where TiO2 at 50 ppm under artificial light source. The results showed that photodegradation rate of diazinon and fenitrothion was increased in the presence of TiO2. Disappearance of these insecticides was achieved within 4.5 and 3.5 hr, respectively. While in the absence of TiO2 the disappearance was not achieved and photodegradation percentages of diazinon and fenitrothion were 27.4 and 23 %, respectively. Complete mineralization of diazinon and fenitrothion residues was attained in the presence of TiO2 after 22 and 18 hr, respectively. While in the absence of TiO2 complete mineralization was not achieved and the percentages of released phosphate ions were 20.5 and 18.3 only, respectively. Bioassay of the treated water on the 4th larval instar of Culex pipens was conducted in order to evaluate the toxicity of the intermediate photodegradation products. Data revealed that percentages of Culex pipens larvae mortality for diazinon and fenitrothion residues after 26 and 22 hr of starting irradiation were 45 and 40 % respectively. While in the presence of TiO2 the critical solution of diazinon and fenitrothion residues were not toxic for Culex pipens larvae at the same periods. Some Bolti fish enzymes activities were determined after rearing for 30 days in water treated with 1/10 LC50 of both insecticides and exposed to the previous techniques of insecticide detoxification. Data revealed generally that there were no significant differences recorded in the activities of tested enzymes as affected by the photocatalytic oxidation process. | ||
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