Department of Leather Engineering, Khulna University of Engineering & Technology, Khulna-9203, Bangladesh.
Department of Civil Engineering, Bangladesh University of Engineering and Technology, Dhaka-1000, Bangladesh.
Environ Monit Assess. 2021 Oct 2;193(10):688. doi: 10.1007/s10661-021-09497-x.
At various locations around the world, environments are now becoming greatly polluted by heavy metals, while damage is being done to soil and aquatic life with serious implications for humanity as well. Once heavy metals enter the ecosystem, they persist for a long time, and they are very difficult to eliminate. Discharging of industrial wastes enriched with heavy metals substantially pollutes the soil, water, and air. This study investigated the levels of heavy metals around the industrial area of Brahmanbaria, which is located in Chittagong Division, Bangladesh. Samples of soil, wastewater, vegetable, and grass were collected from the industrial area. The heavy metals were quantified using atomic absorption spectroscopy. The heavy metals found in soil were chromium (Cr) 8.2-18.8, lead (Pb) 3.5-18.3, copper (Cu) 4.6-10.8, zinc (Zn) 48.5-273.4, nickel (Ni) 10.06-26.9, and cadmium (Cd) 0.2 mg/kg, respectively. The metal contents in the wastewater were Cr 0.03-0.5, Pb 0.01-0.05, Cu 0.01-0.02, Zn 0.6-11.2, Ni 0.03-0.14, and Cd 0.003 mg/L, respectively. The metal contents in vegetable and grass were Cr 81.5-247.8, Pb 10.3-34.1, Cu 5.5-6.3, Zn 419.8-435.3, and Ni 8.7-15.5 mg/kg, respectively. The amount of metal in the soil, wastewater, and vegetables and grass followed the sequences: Zn > Cr > Ni > Pb > Cu > Cd, Zn > Cr > Ni > Pb > Cu > Cd, and Zn > Cr > Pb > Ni > Cu, respectively. Compared to the WHO guidelines, the soil in the study area was not polluted with Pb, Cu, and Cd but was moderately polluted with Cr, Zn, and Ni. Continual accumulation of metals in the soil, vegetables and grass could pose a serious risk to the environment as well as many life forms.
在世界各地的许多地方，环境正受到重金属的严重污染，土壤和水生生物也受到了严重破坏，这对人类有着严重的影响。一旦重金属进入生态系统，它们就会存在很长时间，并且很难消除。富含重金属的工业废物的排放严重污染了土壤、水和空气。本研究调查了位于孟加拉国吉大港专区的婆罗门巴里亚工业区周围地区的重金属水平。从工业区采集了土壤、废水、蔬菜和草样本。使用原子吸收光谱法对重金属进行定量分析。土壤中发现的重金属分别为铬（Cr）8.2-18.8、铅（Pb）3.5-18.3、铜（Cu）4.6-10.8、锌（Zn）48.5-273.4、镍（Ni）10.06-26.9 和镉（Cd）0.2mg/kg。废水中的金属含量分别为铬 0.03-0.5、铅 0.01-0.05、铜 0.01-0.02、锌 0.6-11.2、镍 0.03-0.14 和镉 0.003mg/L。蔬菜和草中的金属含量分别为铬 81.5-247.8、铅 10.3-34.1、铜 5.5-6.3、锌 419.8-435.3 和镍 8.7-15.5mg/kg。土壤、废水和蔬菜及草中的金属含量顺序为：锌（Zn）>铬（Cr）>镍（Ni）>铅（Pb）>铜（Cu）>镉（Cd）、锌（Zn）>铬（Cr）>镍（Ni）>铅（Pb）>铜（Cu）>镉（Cd）和锌（Zn）>铬（Cr）>铅（Pb）>镍（Ni）>铜（Cu）。与世界卫生组织的指导方针相比，研究区域的土壤中没有受到铅、铜和镉的污染，但受到铬、锌和镍的中度污染。金属在土壤、蔬菜和草中的不断积累可能会对环境和许多生命形式构成严重威胁。
