Journal Of Tropical Biosciences
Volume No: 11|
Page No: 84
| FullText PDF
Title: HEAVY METAL CONCENTRATION IN SURFACE WATER AND MACROBENTHIC INVERTEBRATES OF MAKWAYE RESERVOIR ZARIA, NIGERIA
*ALHASSAN, A. B., BALARABE, M.L. AND GADZAMA, I.M.K.
DEPARTMENT OF BIOLOGICAL SCIENCES, AHMADU BELLO UNIVERSITY ZARIA, NIGERIA
The concentrations of Fe, Mn, Zn, Cd, Ni and Pb in surface water and macrobenthic invertebrate samples from Makwaye reservoir were investigated monthly between January and December, 2014 to determine the seasonal variation in heavy metal composition of the reservoir. Water samples were collected in triplicates from 10cm depth from three selected sites into transparent ambered coloured 1litre reagent bottles. Macrobenthic invertebrates were collected using an Ekman Grab. Heavy metal concentrations in water samples and macrobenthic invertebrates were analysed using Air/Acetylene Flame Atomic Absorption Spectrophotometer (UNICAM 696 AA Spectrometer). One way analysis of variance (P≤0.05) and Student’s t – test were used to determine heavy metal variations in macrobenthic invertebrates and between seasons. Principal Component Analysis (PCA) was used to establish the interrelationship between the heavy metals and macrobenthics. Significant variations (P≤0.05) were observed in heavy metal concentrations in macrobenthic invertebrates with high concentration of Fe (29.07 mg/L), while Cd and Pb were Below Detectable Limit (BDL). For water samples, Fe (150.91 mg/L) also recorded the highest concentration and Pb (1.38 mg/L) concentration was the lowest while Cd concentration was Below Detectable Limit (BDL). Repetitive limnological measurements should be carried out on the reservoir to monitor and track the trend of changes of its water quality and biodiversity.