Approximately 25 g of the baby food sample was weighed on an
analytical balance and was homogenized with 200 mL of water
(100 C) in a blender and filtered through a Whatman 541 quantitative
filter paper. 80 mL of the resultant mixture was transferred
to a screw-capped bottle (120 mL capacity). Activated carbon
(100–250 mg) with 2 mL each of Carrez reagents I and II were
added and the bottle was tightly screw-capped. The mixture was
shaken on a Stuart Scientific Shaker SF1 for approximately
30 min. The mixture was filtered through HPLC syringe filters
(0.45 lm) into 50 mL polypropylene vials ready for analysis.