Abstract
The study aims to assess the trace metals and physicochemical properties of water in the adjacent to the Sylhet gas blowout area. Trace metals were analyzed using atomic absorption spectrophotometer, whereas physicochemical parameters were evaluated in-situ state using portable instruments and also in the laboratory. Trace metals Pb, Cd, and Ni were found in the water samples higher than the acceptable limit by WHO standards, whereas the concentration of Cu and Zn were within acceptable limit, respectively. The correlation coefficient matrix and factor loading analysis spectacle that the interrelationship among the physicochemical parameters, trace elements, as well as other ions are moderate to strongly corellated which reflecting the homogeneous source of origin. According to contamination factor, Nemerow multi-factor index, pollution load index, and also, potential ecological risk index, the water of the region is quite polluted in case of Pb, Cd, and Ni but unpolluted for Cu and Zn. The water quality index indicates that treatment of water is required before using it for domestic purposes. The health quotient and hazard index results are less than standard value 1 suggesting that there is no noncarcinogenic risk in the area. The carcinogenic analysis shows that the lifetime incremental cancer risk mean value of Cd and Ni are fairly insignificant and Pb is more significant for children to cause health problem. The ILCR value of Cd and Ni are insignificant whereas Pb is significant to pose health risk for adults. Physicochemical parameters revealed that the water was slightly acidic and soft in nature implying to avoid the water from this area for drinking purposes. At the end, it can be concluded that this study will be useful for the residence as well as the policymaker to take the protective surveillance measures around the areas.
Highlights
Water is an important component of earth which is much essential for our daily life
This study assessed (1) some physicochemical parameters and the trace metals (Ni, Cd, Cu, Zn, and Pb) that would have accumulated in the water body of the adjacent areas due to the blowout, (2) the ecological and human health risk coupled with trace elements (TMs) and the physicochemical properties of water, (3) the long-term impact of the massive gas blowout on humans and ecology, (4) the possible pollution intensity for effective management of water resources around the gas blowout areas of the Sylhet gas field
This study evaluated the ecological risk as well as the health risk from the presence of trace elements (TMs) in the water around the gas field blowout zone
Summary
Water is an important component of earth which is much essential for our daily life. Based on use, water can be typified as drinking, domestic, livestock, irrigation, industrial and so on. This study deemed that seeped methane changes the concentration level of trace elements with physicochemical properties of ground-surface water around the adjacent areas. This might have an impact on the public health and ecological system in the area. The carcinogenic risks of heavy metal were found to have higher than the standard limit in several studies in Bangladesh which might have increase the cancer risk exposure to different ages of people[20].Nadim et al.[21] and Wang et al.[22] entailed that environmental water pollution due to the operation of oil gas industries is very frequent in the developing country as well as in the Globe. The present article on ecologicalhealth risk evaluation will be encouraging to the proper authority and policy maker for understanding the highly risky areas to look after the overall ecosystem and human health professionally
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