Mfouati河(刚果布拉柴维尔以南)沉积物中部分重金属的统计方法

Ifo Grace Mazel, Kouhounina Banzouzi Merline Lady, Diamouangana Mpissi Zita Flora, Tchoumou Martin
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At the end of the sampling, the samples were analyzed by Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). \nPlace and Duration of Study: Sediments were collected in the Mfouati River near the area impacted by the mining operation, these samples were taken in September 2021. \nMethodology: X-ray diffraction was performed on the sediments of the Mfouati River, the physico-chemical parameters were measured with a Hanna type apparatus. The contents of heavy metals (Mo, Co, Cd, Ni, Sb, Bi) in the sediments were measured by optical emission spectroscopy (ICP-OES). The level of metallic contamination, the indices of evaluation of the contamination (FC, FE, Igeo) were calculated by using the expressions which exist in the literature. \nResults: The results obtained show that the physical-chemical parameters (pH, EC and TDS) measured are within the standards (WHO). Only the pH which presents a slightly acid character at the stations (S4, S5, S6). 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引用次数: 0

摘要

目的:本研究的总体目的是评估受采矿作业影响地区附近Mfouati河沉积物中的重金属[钼(Mo)、钴(Co)、镉(Cd)、镍(Ni)、锑(Sb)、铋(Bi)]。研究设计:沉积物在废弃工厂附近和附近地区收集。采样结束后,采用电感耦合等离子体发射光谱(ICP-OES)对样品进行分析。研究地点和持续时间:沉积物在受采矿作业影响的地区附近的Mfouati河收集,这些样本于2021年9月采集。方法:对Mfouati河沉积物进行x射线衍射,用汉纳式仪器测定其理化参数。采用发射光谱(ICP-OES)法测定了沉积物中重金属Mo、Co、Cd、Ni、Sb、Bi的含量。金属污染水平、污染评价指标(FC、FE、Igeo)采用文献中已有的表达式进行计算。结果:测定的理化参数(pH、EC、TDS)均在WHO标准范围内。只有站位(S4, S5, S6)的pH值呈现轻微的酸性特征。发现的重金属含量(mg/Kg)在Mo: [0,05-23];有限公司(10-39):;Cd [0, 1 - 63);倪(7-36);Bi (0164 - 0169);某人(1至29)。x射线衍射结果显示,其主要矿物为滑石和高岭石。污染因子的排列顺序为:FC(Cd)> FC(Sb) >FC(Mo) >FC(Co) >FC(Bi) >FC(Ni);富集因子的排列顺序为:FE(Cd)>FE(Sb)>FE(FE)>FE(Bi) >FE(Mo);地质聚集指数顺序为:Igeo(Ni)>Igeo(Co) >Igeo(Mo) >Igeo(Sb) >Igeo(Cd) >Igeo(Bi)。结论:姆富阿提河沉积物中Co、Cd、Ni、Sb、Mo等金属含量高于地壳中。
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Statistical Approach of Selected Heavy Metals in the Sediments of the Mfouati River (South of Congo Brazzaville)
Aims: The general objective of this study was to evaluate heavy metals [Molybdenum (Mo), Cobalt (Co), Cadmium (Cd), Nickel (Ni), Antimony (Sb), Bismuth (Bi)] in the sediments of the Mfouati River near the area impacted by the mining operation. Study Design: The sediments were collected in the area near the abandoned plant and in the vicinity. At the end of the sampling, the samples were analyzed by Inductively Coupled Plasma Optical Emission Spectroscopy (ICP-OES). Place and Duration of Study: Sediments were collected in the Mfouati River near the area impacted by the mining operation, these samples were taken in September 2021. Methodology: X-ray diffraction was performed on the sediments of the Mfouati River, the physico-chemical parameters were measured with a Hanna type apparatus. The contents of heavy metals (Mo, Co, Cd, Ni, Sb, Bi) in the sediments were measured by optical emission spectroscopy (ICP-OES). The level of metallic contamination, the indices of evaluation of the contamination (FC, FE, Igeo) were calculated by using the expressions which exist in the literature. Results: The results obtained show that the physical-chemical parameters (pH, EC and TDS) measured are within the standards (WHO). Only the pH which presents a slightly acid character at the stations (S4, S5, S6). The heavy metal contents found (mg/Kg) vary between Mo: [0,05-23] ; Co:[10-39] ; Cd[0,1-63] ; Ni[7-36] ; Bi[0,164-0,169] ; Sb[1-29]. X-ray diffraction showed the presence of the following minerals: Talc and Kaolinite. The results of contamination factor showed the following order:FC(Cd)> FC(Sb) >FC(Mo) >FC(Co) >FC(Bi) >FC(Ni);enrichment factor the order is as follows: FE(Cd)>FE(Sb)>FE(Fe) >FE(Bi) >FE(Mo); geo accumulation index the order is as follows:Igeo(Ni)>Igeo(Co) >Igeo(Mo) >Igeo(Sb) >Igeo(Cd) >Igeo(Bi). Conclusion: The levels of metals Co, Cd, Ni, Sb, Mo in the sediments of the Mfouati River are higher than the concentrations in the terrestrial crust.
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