Groundwater aquifer from solid waste dumpsites is probable of discharging toxic pollutant to groundwater which is unsafe to human health and local ecosystem. This study was conducted to examine the physicochemical qualities of groundwater around solid waste dumpsite in Aba, Abia State during wet and dry seasons. The physicochemical analysis of the groundwater samples was determined in accordance with the standards of the American Public Health Association (APHA). The results obtained from the groundwater samples were compared with World Health Organization (WHO) and the Nigerian Standard for Drinking Water Quality (NSDWQ) permissible limit of those studied parameters in drinking water. The physicochemical values obtained from the groundwater around the dumpsite in both season shows that some of the tested parameters existed in values higher than both WHO and NSDWQ standards for drinking water quality. The results also showed that the concentrations of cadmium, aluminum, iron and zinc were within the WHO and NSDWQ standard, whereas, the concentrations of chromium, copper and lead exceeded the WHO and NSDWQ standards for drinking water quality in both studied seasons. Findings from this study suggest that dumpsite solid waste could impact negatively on some physicochemical qualities of groundwater sited around their vicinity. Therefore, the location of solid waste dumpsites around residential areas should be discouraged.

Mononuclear Co(II), Ni(II), Cu(II), Zn(II) and Zr(IV) complexes with new bidentate Schiff base ligand 2-hydroxy-N’-(2-oxoindolin-3-ylidene)benzohydrazide (LH2) were synthesized and the complexes were characterized by elemental analysis, IR, FAB-mass, molar conductivities, magnetic measurements, electronic spectra and thermal analysis. The Cu(II) complex was additionally characterized by ESR study. The ligand behaves as a monobasic bidentate ligand, coordinating through azomethine Nitrogen and the deprotonated Oxygen atom. Analytical data suggested 1:2 (metal: ligand) mole ratio for all the complexes. The low molar conductance values of the all metal complexes in DMSO reveal their non-electrolytic nature. The physicochemical data suggested an octahedral geometry for Zn(II) and Zr(IV) complexes, distorted octahedral geometry for Cu(II), whereas square planar geometry for Co(II) and Ni(II) complexes. The thermodynamic analysis showed that the complexes loose hydrated and/or coordinated water molecules in the first step followed by decomposition of ligand moiety in the further steps leading to formation of stable metal oxide. The antibacterial as well as antifungal activities of the ligand and its metal complexes were evaluated.