Department of Chemistry, Imo State University, P.M.B. 2000, Owerri, Imo State, Nigeria.
Department of Geology, Federal University of Technology, P.M.B.1526, Owerri, Imo State, Nigeria.
Environ Monit Assess. 2018 Nov 3;190(12):696. doi: 10.1007/s10661-018-7023-6.
Assessment of trace metal concentrations in street-deposited sediments around some selected electronic repair workshops in Owerri, Imo State, Nigeria, was carried out. The objective of the study was to determine the concentrations of trace metals, namely nickel (Ni), chromium (Cr), lead (Pb), copper (Cu), cadmium (Cd), and zinc (Zn), in surface dusts from streets within some electronic repair workshops in Owerri, Imo State, Nigeria. Dust samples were collected from seven locations within the month of January 2014 during the dry season when the onset of dust was high in the area. The samples were air-dried, sieved, and digested in aqua regia, with the concentrations of trace metals determined with atomic absorption spectroscopy, Agilant FS 240AA model (USA). Results of the study revealed all the trace metals assessed except Cr in dust sample from Aladinma (ALA). Though elevated concentrations of Zn and Cu were observed in all the sampled locations, the concentrations did not exceed the Dutch intervention values. Risk assessment of the heavy metals showed high average daily dose (ADD) of the heavy metals for children and adults at New Market 2 (NMK2), New Market 1 (NMK1), and Tetlow (TEL), which could be attributed to the presence of electronic repair workshops and activities of electronic scrap dealers within these areas. It was observed that the values of hazard quotient (HQ) were less than 1, while that of hazard index (HI) were all below 1-5, indicating that the heavy metals pose no health risk to adults and children in the environment. However, there may be potential danger if the waste generated from the electronic repair workshops and electronic scrap dealers are not properly disposed and managed.
对尼日利亚伊莫州奥韦里（Owerri）一些选定的电子维修车间周围街道沉积沉积物中的痕量金属浓度进行了评估。该研究的目的是确定尼日利亚伊莫州奥韦里（Owerri）一些电子维修车间街道表面灰尘中痕量金属（镍（Ni）、铬（Cr）、铅（Pb）、铜（Cu）、镉（Cd）和锌（Zn））的浓度。在该地区扬尘高发的旱季，于 2014 年 1 月从七个地点采集了灰尘样本。将样本风干、过筛，然后在王水中消解，用原子吸收光谱法（Agilant FS 240AA 型，美国）测定痕量金属的浓度。研究结果表明，除了在 Aladinma（ALA）的灰尘样本中未检测到 Cr 之外，所有评估的痕量金属均存在。尽管在所有采样点都观察到 Zn 和 Cu 的浓度升高，但这些浓度并未超过荷兰干预值。重金属的风险评估显示，在 New Market 2（NMK2）、New Market 1（NMK1）和 Tetlow（TEL），儿童和成人的重金属平均日剂量（ADD）很高，这可能归因于电子维修车间和电子废料经销商在这些地区的活动。结果表明，危害系数（HQ）值均小于 1，而危害指数（HI）值均低于 1-5，表明重金属对环境中的成人和儿童没有健康风险。然而，如果电子维修车间和电子废料经销商产生的废物没有得到妥善处理和管理，可能会存在潜在的危险。
