Monitoring of seasonal variation of some trace metals concentration in surface water collected from the coastal area of Bangladesh

Abstract

This study was conducted to determine the seasonal variation of Cr, Ni, Cu, Zn, As, Cd and Pb concentrations in water from four coastal sites of Bangladesh. The mean concentrations of trace metals in the water samples in the range of each elements were µg/l) in winter. The mean concentrations of the metals in water followed a decreasing order of Zn > Cu > Pb > Ni > Cr > As > Cd in the summer and Zn > Ni > Cr > Cu >Pb > As > Cd in the winter. The water of Cox's Bazar hatchery site showed the highest levels of Zn (1390), Cu (510) and Pb (109 µg/l) in summer while As (19.7 µg/l) showed highest in Cox's Bazar Bakkhali estuary in the winter samples. The elevated level of Ni (77.5 µg/L) in the summer and Cr (43.7 µg/l) in the winter water samples were also found in the Sundarbans site. The mean concentrations of all estimated trace metals were higher in the winter than in the summer season. It was both in the Chittagong port and Meghna estuary. For the Meghna estuary, the highest concentration of Zn (36.0 µg/l) was observed in the water sample of winter season. Some trace metals exceeded the international quality guidelines. Suspended solid, temperature, rainfall, anthropogenic inputs and geomorphologic setup are influenced by seasonal vagaries which alter the variation of metal distribution.

Heavy metal concentrations in water from Bakkhali River estuary, Cox’s Bazar, Bangladesh

“…The average value of salinity recorded 22.02±0.28ppt during pre-monsoon and 30.4±0.69 during post monsoon. Previous study on seasonal variation of physicalchemical parameters in Bakkhali River revealed salinity level 12 ppt in pre monsoon and 27 ppt in post monsoon (Raknuzzaman et al, 2018). The studied results higher than Masoud et al (2019) revealed the values of salinity in the Reju Khal river estuary ranged from 8.0±3.0 to 29.0±0.6 ppt, and Zinat et al (2023) recorded the values of salinity ranged between 5.35±0.10 to 18.82±0.11 in the Passur river as Bakkhali estuary comprised salt marsh sediment and.…”