Assessment of heavy metals in urban highway runoffudfrom Ikorodu expressway Lagos, Nigeria

摘要

The distribution of heavy metals in the urban high way run off from Ikorodu expressway of Lagos wasudstudied between March to May, 2004.The heavy metals studied include Pb, Cu, Cr, Zn and Cd. The levelsudof these selected heavy metals were determined using Atomic Absorption Spectrophotometer (Mscientificud200 Model). Trends in the heavy metal from the runoff showed significant variations betweenudthe months were values recorded in the month of April showed high values. Statistical analysesudshowed different mean levels of these heavy metals assessed at the five collecting points. Theuddistribution shows Zn > Pb > Cu > Cr > Cd. Zn recorded the highest concentration levels between (53.4ud± 35.5 - 107.5 ± 80.4 μg/l), while Cd levels (ND - 6.00 μg/L) were the lowest. However, the results obtainedudfalls within the permissible limits of FMENV effluents limits, FHWA and WHO standards of water foruddomestic use.