Evaluation of some heavy metal contaminants in biscuits, fruit drinks, concentrates, candy, milk products and carbonated drinks sold in Ibadan, Nigeria

Abstract

There is an increasing concern about the health effect in human due to continual consumption of food contaminated with heavy metals gotten from raw materials, manufacturing and packaging processes. It is therefore crucial to know the level of heavy metals in them because of its bio-accumulative property. A total of twelve (12) different brands of sweet and milk sweets, six different brands of biscuits, eleven different brands of fruit and flavoured concentrates and five different types of liquid drinks all of popular brands were collected. All the samples were cold digested using concentrated hydrochloric acid and nitric acid in ratio 1:1. The extracts were analysed for calcium, chromium, copper, iron, lead, and cadmium with Perkin Elmer (A Analyst 200) Flame Atomic Absorption Spectrophotometer. Appropriate quality assurance procedures were followed to ensure accuracy of results. Results showed that calcium and iron were present in all the samples analysed while chromium, copper, lead and cadmium were not detected in some samples. Calcium had higher concentration than other heavy metals in all the samples. Concentrations of these metals in all the samples were found to be lower than their permissible limits, which implied non contamination hence no health threat to human, but continuous consumption may be hazardous to the health.

Keywords: Hazardous, bio-accumulative, contamination.