Handling the contaminated Beans purchased from market:
The statement was released by the Director-General of Nigeria Consumer Protection Council (Page 44 of Saturday Punch 10/11/2018) advising consumers to properly wash their beans before consumption and to also make sufficient enquiries before engaging in new purchases. Credible information had revealed that retailers in some open markets use 2,2-dichlorovinyl dimethyl phosphate compound (Sniper, Nuvan, Otah Pia-pia), to preserve beans by eliminating weevils during storage. The chemical is highly injurious to mammals, specifically humans.
The laboratory detection method is High Performance Liquid Chromatography (HPLC) screening.
Other methods such as putting a quantity of grains in a bowl, adding water and stirring for about thirty seconds and observing oily film on the water surface may NOT BE FOOLPROOF. To properly wash grains (dried shelled/unshelled maize, beans, etc.) before consumption is a relatively safe measure.