Determination of Pirimiphos-Methyl and Chlorpyrifos-Ethyl Residues on Tomato and Pepper Fruits Grown in Greenhouse
Titel:
Determination of Pirimiphos-Methyl and Chlorpyrifos-Ethyl Residues on Tomato and Pepper Fruits Grown in Greenhouse
Auteur:
Mohammed A. Al-Eed
Verschenen in:
Journal of applied sciences
Paginering:
Jaargang 6 (2006) nr. 4 pagina's 979-982
Jaar:
2006
Inhoud:
The objective of this reserch is to determine the residues of pirimiphos-methyl and Chlorpyrifos-ethyl insecticides on greenhouse tomato and pepper fruits, a green house trial was carried out at the King Faisal Research Station, King Faisal University, Al-Hassa, Saudi Arabia. The experiment was designed in randomize block design. Samples of tomato and pepper fruits were randomly collected from treated and non-treated plants after a time elapse of one hour, , and 7 days post insecticide treatments. Fruit extracts were analyzed for pirimiphos-methyl and Chlorpyrifos-ethyl residues using gas chromatography. The data showed that pirimiphos-methyl was vastly degraded when compared with Chlorpyrifos-ethyl. Chlorpyrifos-ethyl degradation of 8.2, .2 and 73.2% were recorded as compared with 30.4, 89.5 and 94.8% for pirimiphos-methyl after one, three and seven days, respectively. Chlorpyrifos-ethyl residues on tomato or pepper fruits after 3 days, represented more than ten folds of the maximum residue limits on vegetables (50 μg kg<sup>-1). The data also showed that the rates of degradation were 0.14 and 0.44 day<sup>-1 and 0.28 and 0.18 day<sup>-1 and the t1/2 was 4.8 and 1.6 day for pirimiphos-methy l and .5 and .9 day for chlorpyrifos-ethyl on tomato and pepper, respectively.
Uitgever:
Asian Network for Scientific Information, Pakistan (provided by DOAJ)
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