The impacts of rock quarry activities on physicochemical and bacterial diversity of air in Akpuoha and Ishiagu communities of Ebonyi State, Nigeria
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Abstract
Abstract. Agwaranze DI, Ogodo AC, Nwaneri CB. 2024. The impacts of rock quarry activities on physicochemical and bacterial diversity of air in Akpuoha and Ishiagu communities of Ebonyi State, Nigeria. Asian J Trop Biotechnol 21: 33-40. This study aims to evaluate the impacts of rock mining (quarry) activities physicochemical and bacterial diversity of air in two communities, Akpuoha and Ishiagu of Ebonyi State, Nigeria. The physicochemical parameters of the air were determined in situ using hand-held environmental sensor meters (Roca Raton, England), while the diversity of bacteria was determined using the settle plate technique. The results showed that temperature ranged from 28.5-33.4°C, Particulate Matter (PM2.5) ranged from 3.0-9.4 µg/m3, Particulate Matter (PM10) ranged from 3.0-9.6 µg/m3 and Carbon Oxides (COX) ranged from 3.2-8.9 µ/mol, in Ishiagu during the dry season. The same parameters were assessed in Akpuoha during the dry season with values of temperature ranging from 28.8-31.3°C, PM2.5 ranged from 4.2-8.7 µg/m3, PM10 ranged from 4.4-9.3 µg/m3 while COX ranged from 3.2-7.4 µ/mol. Values were observed to be highest nearest the quarries but decreased with distances away. The same pattern was observed for the parameters during the rainy seasons in both communities; however, lower values were obtained during the rainy season, with the quarry effects being limited to 100-200 m from the quarry edge. The dry season results indicated a more gradual slope extending to 200-300 m. The bacterial diversity of the air was determined and the bacterial physiological groups determined were Total Heterotrophic Bacterial Count (THBC), Total Pathogenic Bacterial Count (TPBC), Total Coliform Count (TCC), and Total Fecal Coliform (TFC). THBC at Ishiagu and Akpuoha in both seasons had the highest counts, followed by TCC and TPBC, while TFC was the least at each sampling distance. The counts decreased with distance from the Quarry site and increased with plate exposure time. Therefore, all quarry industries should be located away from the immediate vicinity of human settlements.