Famuyiwa Abimbola O, Davidson Christine M, Ande Sesugh, Oyeyiola Aderonke O
Department of Pure and Applied Chemistry, University of Strathclyde, 295 Cathedral Street, Glasgow G1 1XL, UK.
Department of Science Laboratory Technology, Moshood Abiola Polytechnic, Abeokuta, Ogun State, Nigeria.
Toxics. 2022 Mar 23;10(4):154. doi: 10.3390/toxics10040154.
Rapid urbanization can lead to significant environmental contamination with potentially toxic elements (PTEs). This is of concern because PTEs are accumulative, persistent, and can have detrimental effects on human health. Urban soil samples were obtained from parks, ornamental gardens, roadsides, railway terminals and locations close to industrial estates and dumpsites within the Lagos metropolis. Chromium, Cu, Fe, Mn, Ni, Pb and Zn concentrations were determined using inductively coupled plasma mass spectrometry following sample digestion with aqua regia and application of the BCR sequential extraction procedure. A wide range of analyte concentrations was found—Cr, 19−1830 mg/kg; Cu, 8−11,700 mg/kg; Fe, 7460−166,000 mg/kg; Mn, 135−6100 mg/kg; Ni, 4−1050 mg/kg; Pb, 10−4340 mg/kg; and Zn, 61−5620 mg/kg—with high levels in areas close to industrial plants and dumpsites. The proportions of analytes released in the first three steps of the sequential extraction were Fe (16%) < Cr (30%) < Ni (46%) < Mn (63%) < Cu (78%) < Zn (80%) < Pb (84%), indicating that there is considerable scope for PTE (re)mobilization. Human health risk assessment indicated non-carcinogenic risk for children and carcinogenic risk for both children and adults. Further monitoring of PTE in the Lagos urban environment is therefore recommended.
快速城市化可能导致潜在有毒元素（PTEs）对环境造成严重污染。这令人担忧，因为PTEs具有累积性、持久性，并且会对人类健康产生有害影响。从拉各斯大都市内的公园、观赏花园、路边、铁路终点站以及靠近工业区和垃圾场的地点采集了城市土壤样本。采用王水消解样品并应用BCR连续萃取程序后，使用电感耦合等离子体质谱法测定铬、铜、铁、锰、镍、铅和锌的浓度。发现分析物浓度范围很广——铬，19−1830毫克/千克；铜，8−11700毫克/千克；铁，7460−166000毫克/千克；锰，135−6100毫克/千克；镍，4−1050毫克/千克；铅，10−4340毫克/千克；锌，61−5620毫克/千克——在靠近工厂和垃圾场的区域含量较高。连续萃取前三步中释放的分析物比例为铁（16%）<铬（30%）<镍（46%）<锰（63%）<铜（78%）<锌（80%）<铅（84%），表明PTE（再）迁移的可能性很大。人类健康风险评估表明儿童存在非致癌风险，儿童和成人都存在致癌风险。因此，建议对拉各斯城市环境中的PTE进行进一步监测。
