2.8. Collection of food products
Samples of mango, milk and fish were purchased from Dhaka
local markets, processed (non-edible parts removed) and ground
up using a Waring Laboratory grinder (Dynamic Corp. of America,
USA). Samples, which were not directly analyzed, were stored at
20 C until analysis. Samples of fruits (18), vegetables (21), milk
(5), fish (5) and fish feed (14) were collected from different markets
from four areas of Dhaka city, namely, Nakhalpara, Gulshan, Mohakhali
and Gazipur.