Degradation of organophosphorus pesticides in aqueous extracts of young green barley leaves (Hordeum vulgare L)
✍ Scribed by Durham, Janis J; Ogata, Joji; Nakajima, Sadatoshi; Hagiwara, Yoshihide; Shibamoto, Takayuki
- Publisher
- John Wiley and Sons
- Year
- 1999
- Tongue
- English
- Weight
- 89 KB
- Volume
- 79
- Category
- Article
- ISSN
- 0022-5142
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✦ Synopsis
The degradation of the organophosphorus pesticides malathion, chlorpyrifos, guthion, diazinon, methidathion and parathion in an aqueous extract of young green barley leaves (Hordeum vulgare L) was monitored by gas chromatography. Aqueous solutions of various amounts of freezedried young barley leaves containing 5.75 mg l À1 of malathion were incubated at 37 °C and pH 7.4 over prolonged time periods. Over 95% of the malathion degraded in 4 h in a 3% (30 g l À1 ) solution of young green barley leaves. When the barley solution was autoclaved at 120 °C for 25 min prior to the addition of malathion, no degradation of malathion was observed. When 10 mg l À1 each of the above six pesticides was incubated in a 15% (150 g l À1 ) solution of young green barley leaves for 3 h at 37 °C and pH 7.4, malathion and chlorpyrifos degraded 100%, whereas parathion (75%), diazinon (54%), guthion (41%) and methidathion (23%) showed lesser degrees of degradation.