Physicochemical, microbiological and heavy metal studies on water samples and bacteria obtained from Dandaru River in Ibadan, South-western Nigeri

Abstract

The physicochemical, microbiological and heavy metal studies of water samples and bacteria obtained from the Dandaru River were investigated. Water samples were collected from six different sampling points along the course of the river and analysed using standard procedures. The physicochemical parameters showed that the water samples at point 5 had the highest value for all the parameters except Total Dissolved Solids. The heavy metal analysis revealed that the mean concentration of zinc, lead, chromium and iron were highest at point 5; 2.11, 0.02, 0.04 and 0.54 mg/l respectively, while that of copper and manganese concentration was highest at point 4 (0.59 and 0.41 mg/l respectively). The total heterotrophic bacteria count was between 3.6 -64.0 ×10 1 cfu/ml, with point 3 having the least value (3.6×10 1 cfu/ml); while the coliform count using Most Probable Number (MPN) tube method ranged from 350 -≥1600 MPN index/100 ml. The bacteria obtained belonged to the genera Bacillus, Enterobacter, Escherichia, Pseudomonas and Staphylococcus. On exposure to increasing concentration of six heavy metals, 47.62% of the total bacteria obtained were observed to be growing at 500 µg/ml for all the six metals employed in this study, while the others showed varying degree of tolerance to the metals.

Heavy Metals and Antibiotics Susceptibility Profiles of <i>Staphylococcus aureus</i> Isolated from Several Points Receiving Daily Input from the Bodija Abattoir in Ibadan, Oyo State, Nigeria

“…However, the value of the heterotrophic count in this study (0.9 × 10 7 ) is higher than the 1.2 × 10 6 as it was reported by Ogbonna [32]. However, a lower total bacterial count (3.6 -6.4 × 10 1 ) compared to the one observed in this study was reported by Adekanmbi and Falodun [28], in a study carried out on water samples collected from a river that is close to a tertiary hospital with human activities such as car washing, laundry, bathing, swimming and fishing influencing its quality, but the present study was carried out on abattoir wastewater, however, similar activities were observed in both instances.…”

Physicochemical and heavy metals analysis of Udo Awankwo River in Ikot Ekpene, South-South, Nigeria

“…Except at sampling point 1 with 0.38mg/l, the lead content of the river is within the SON and WHO permissible limits of 0.1mg/l. this is in agreement with the report of other researchers during similar studies [10] [24] [25] reported a higher level of 3.59mg/l.…”

“…The results of the physicochemical analysis of the water samples as presented in Table 1 showed that the pH values recorded are within the World Health Organization, WHO permissible limit of 6.5 -8.5 and Federal Environmental Protection Agency (FEPA) permissible limit of 6.0 -9.0. This observation is also similar to the pH value range of 7.8-8.2 reported in Turkey [9] and Ibadan, Nigeria [10] but lower compared to the range of 7.4 -10.0 reported from another study in Turkey [11]. The pH of water is very important in that changes in pH values may affect the toxicity of microbial poisons in the water [12].…”

Metal-resistance encoding gene-fingerprints in some bacteria isolated from wastewaters of selected printeries in Ibadan, South-western Nigeria

“…Various genera of metal-resistant bacteria have been isolated from different sources notably wastewater. Several authors have reported the isolation of metalresistant bacteria from various sources [7,[16][17][18]. Bacteria adapt to metal stress in their environment and respond to it by developing several resistances or coping mechanisms to its toxicity [19].…”