LEVELS OF LEAD, CADMIUM AND CHROMIUM IN BLOOD, URINE, NAIL AND HAIR SAMPLES OF ELECTRONIC REPAIRERS IN KADUNA METROPOLIS, NIGERIA

A THESIS SUBMITTED TO THE SCHOOL OF POST GRADUATE STUDIES AHMADU BELLO UNIVERSITY, ZARIA IN PARTIAL FULFILMENT OF THE REQUIREMENTS FOR THE AWARD OF MASTER OF SCIENCE IN ANALYTICAL CHEMISTRY