Homa Dereje, Haile Ermias, Washe Alemayehu P
Department of Chemistry, Hawassa University, 05, Hawassa, Ethiopia.
Int J Anal Chem. 2016;2016:7214932. doi: 10.1155/2016/7214932. Epub 2016 Dec 1.
This study was conducted to determine the spatial levels of chromium contamination of water, agricultural soil, and vegetables in the leather tanning industrial areas using spectrophotometric methods. The results showed elevated accumulation of total Cr ranging from 10.85 ± 0.885 mg/L to 39.696 ± 0.326 mg/L, 16.225 ± 0.12 mg/Kg to 1581.667 ± 0.122 mg/Kg, and 1.0758 ± 0.05348 mg/Kg to 11.75 ± 0.206 mg/Kg in water, agricultural soil, and vegetable samples, respectively. The highest levels of chromium (VI) found from the speciation study were 2.23 ± 0.032 mg/Kg and 0.322 ± 0.07 mg/L in soil and water samples, respectively, which decreased with distance from the tannery. Among the vegetables, the highest load of Cr(VI) was detected in onion root (0.048 ± 0.065 mg/Kg) and the lowest (0.004 ± 0.007 mg/Kg) in fruit of green pepper. The detected levels of Cr in all of the suggested samples were above the WHO permissible limits. The variations of the levels Cr(III) and Cr(VI) contamination of the environment with distance from the tannery were statistically significant ( = 0.05). Similarly, significant difference in the levels of Cr among the tested vegetables was recorded. The levels increased with decreasing distance from the effluent channel.
本研究旨在采用分光光度法测定皮革鞣制工业区水体、农业土壤和蔬菜中铬污染的空间水平。结果表明，水体、农业土壤和蔬菜样品中总铬的积累量分别升高至10.85±0.885毫克/升至39.696±0.326毫克/升、16.225±0.12毫克/千克至1581.667±0.122毫克/千克以及1.0758±0.05348毫克/千克至11.75±0.206毫克/千克。形态研究中发现土壤和水样中铬（VI）的最高含量分别为2.23±0.032毫克/千克和0.322±0.07毫克/升，其含量随与制革厂距离的增加而降低。在蔬菜中，洋葱根中铬（VI）的含量最高（0.048±0.065毫克/千克），青椒果实中最低（0.004±0.007毫克/千克）。所有建议样品中检测到的铬含量均高于世界卫生组织的允许限值。环境中铬（III）和铬（VI）污染水平随与制革厂距离的变化具有统计学意义（P = 0.05）。同样，在测试蔬菜中铬含量也存在显著差异。含量随与污水排放渠道距离的减小而增加。
