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|Title: ||Effects of per-household processes on the levels of chlorpyrifos residues in lettuce (Lactuca sativa)|
|Authors: ||Akoto, Osei|
|Issue Date: ||2016|
|Publisher: ||International Journal of Food Contamination|
|Abstract: ||Background: 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.
Results: 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.
Conclusions: 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.|
|Description: ||This article is published in International Journal
of Food Contamination and also available at DOI 10.1186/s40550-016-0037-3|
|Appears in Collections:||College of Science|
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