Evaluation of trace metal content in soils subjected to inputs of solid urban wastes

Abstract

Large amounts of solid urban waste (SUW), sometimes containing trace metal (TM), are used to fertilize agricultural soils. The aim of this study was to assess concentrations of TM in peri-urban agricultural soils exposed to SUW inputs around Bobo-Dioulasso. Composite samples of fourteen soil profiles (0-20 cm, 20-40 cm and 40-60 cm) were collected in the classified Dindéréso forest in the outskirts of Bobo-Dioulasso. Inductively coupled plasma mass spectrometry (ICP/MS) was used to analyze TM concentrations in the samples. Concentrations of Cd, Cr, Cu, Ni, Pb and Zn varied broadly according to the sampling sites and soil horizons. The maximum concentrations of the analyzed elements in all sites were lower than the limit concentrations. Regardless soil horizons, the pollution index were less than 1, suggesting that the sampled soils were not subject to multiple contaminations of TM.
 D’importantes quantités de déchets urbains solides (DUS), renfermant parfois des éléments traces métalliques (ETM), sont utilisées pour fertiliser les sols agricoles. Le but de cette étude est d’évaluer les concentrations en ETM des sols péri-urbains de la ville de Bobo-Dioulasso soumis à l’épandage des DUS. Des échantillons composites de sols ont été prélevés, suivant les horizons 0-20 cm, 20-40 cm et 40-60 cm, sur quatorze sites dans la forêt classée de Dindérésso située à la périphérie de la ville de Bobo-Dioulasso. L’analyse des échantillons de sol a été effectuée par spectrométrie de masse avec plasma à couplage inductif (ICP/MS). Les résultats montrent que les concentrations en Cd, Cr, Cu, Ni, Pb et Zn des sols sont très variées. Elles varient en fonction de l’ETM, du site et de l’horizon du sol. Les concentrations des différents ETM dans les sols sont inférieures aux valeurs limites sur tous les sites. L’index de pollution de chaque site est inférieur à 1, quel que soit l’horizon de sol, suggérant ainsi que les sites de la zone ne font pas l’objet d’une contamination multiple de leurs sols par les ETM.

"Evaluation of Toxic Elements in the Agricultural Soils of the Mbalmayo City (Centre-Cameroon)"

“…The PI is calculated from the average of the ratios of metal concentrations in the soil samples based on the guideline limit values. These limit values correspond to the tolerable levels of metal (TMEs) concentrations in soil according to the DPR standard [29]. The PI is determined by the following formula shown by Equation 2.…”

Influence of the parent rock nature on the mineralogical and geochemical composition of ferralsols used for sedentary agriculture in the Paleoproterozoic Franceville sub-basin (Gabon)

“…About soil fertility, the geochemical and mineralogical composition of soil has significant implications. However, in several African countries, solid urban waste and chemical products are brought to fertilize the top layer of agricultural soils (Agueh et al, 2015;Ye et al, 2020). This pratice leads to the heavy metal contamination in the food chain via cultivated plant product, thus compromising the population health.…”

“…But, all heavy metals are hazardous to human health as they easily bio-accumulate via the food chain due to soil-to-plant transfer of metals (Ali et al, 2019). Given this problem, a better knowledge of the state of soil contamination remains essential for natural resource protection and for environmental protection (Ye et al, 2020;Aduayi-Akue et Grandi, 2014;Yehouenou Azehoun Pazou et al 2020;Kouakou et al, 2019). If data on heavy metal contents and their behavior in plants are available in other African countries, heavy metal contents were not investigated on the top soil layer at Franceville Gabon, despite anthropogenic and agricultural activities throughout studied region.…”