Abstract
The study was organized to evaluate residue levels of chlorpyrifos on Lactuca sativa that are likely to have accumulated on crop during cultivation and also examine the effect some pre-household treatment procedure on residue levels on the crop grown in a tropical and humid environment. Chlorpyrifos residue was extracted using acetonitrile. Subsequent detection and a quantification were done using GC with PFPD. Concentrations of Chlorpyrifos applied at different stages of growth of lettuce were examined at different time intervals of 1 h, 24 h and 7 days after pesticide application. The results showed that residue levels detected at 1 h and 24 h after application were all above the MRL of 0.05 mgkg-1 and can pose health risk to consumers while that recorded 7 days after application were far below the MRL. Accumulation of chlorpyrifos on crop during cultivation was not observed since no significant differences were observed 7 days after application at all the different stages. There is therefore the need for farmers to allowed 7 days’ re-entry intervals before harvesting. The results also showed that, all the pre-household treatment procedures caused significant reduction in residues levels of chlorpyrifos on the crop. Mild detergent treatment was however more effective compared with the other treatments. Hence to reduce the risk associated with intake of chlorpyrifos through lettuce, mild detergent washing procedures should be followed before consumption.
Highlights
The study was organized to evaluate residue levels of chlorpyrifos on Lactuca sativa that are likely to have accumulated on crop during cultivation and examine the effect some pre-household treatment procedure on residue levels on the crop grown in a tropical and humid environment
Fresh lecture samples were collected at different time intervals 1 h, 12 h and 7 days after pesticide application
Physical removal of pesticide residue from a crop is a way of reducing the concentration of the pesticide below acceptable levels
Summary
The study was organized to evaluate residue levels of chlorpyrifos on Lactuca sativa that are likely to have accumulated on crop during cultivation and examine the effect some pre-household treatment procedure on residue levels on the crop grown in a tropical and humid environment. Consumption of diets high in fresh vegetables by Ghanaians is growing. This is because vegetables are universally endorsed as healthy. They supply high amount of vitamins, antioxidants and dietary fiber which is linked to lower incidence of cardiovascular disease and obesity (Slavin and Lloyd, 2012). Lettuce (Lactuca sativa) is an important vegetables cultivated and consumed by both urban and rural dwellers in Ghana. Because of this increase in consumption, lettuce is cultivated all year round in large quantities. Pesticides are use in the production of the crop (Akoto et al, 2013; Gerken et al, 2013)
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