In order to protect and improve market garden crops, market gardeners use large quantities of plant protection products and water in the production area. This has an impact on soil quality. The aim of this study was to determine the level of soil pollution downstream of the Daloa Regional Hospital. Twenty-four soil samples were taken from six sites in the study area. These samples were analysed by liquid/liquid chromatography coupled with mass spectrophotometry. The results of the analyses revealed the presence of seven medicinal residues, including five antibiotics (Ciprofloxacin, Erythromycin, Tetracycline, Sulfamethoxazole and Norfloxacin), a beta-blocker (Propranolol) and an anti-inflammatory (Salicylic Acid). The average concentrations of these antibiotic residues ranged from 3.41 to 50.34 µg/kg; the anti-inflammatory and the beta-blocker recorded values of 112.67 µg/kg and 17.35 µg/kg respectively. Eleven residues of active ingredients, including Chlorothalonil, Cypermethrin, Metamidophos, Endrin, Deltamethrin, Dimethomorph, Profenofos, Beta-endosulfan, Etoenprox, Furathiocarb and Carbendazim, were quantified at levels ranging from 0.04 to 39.62 µg/kg. These active ingredients belong to five families of plant protection products: organochlorines, organophosphates, carbamates, thiocarbamates and synthetic pyrethroids. The constant discharge of these medicinal and phytosanitary residues contaminates the soil and poses a threat to humans and their environment.

The dry formulations of agrochemicals reduce the difficulties related to transport and exposure of users. Nevertheless, these products do not exclude drawbacks and their use requires a deeper knowledge of their toxicological and ecotoxicological effects. The purpose of this work was to study the acute toxicity and reproductive toxicity of glyphosate-based RAPID MAX 750 WG and TAKO-KELE 757 SG on the earthworm Eudrilus eugeniae, ubiquitous in tropical area. Lethality tests were conducted according to EPS1/RM/43, MA.500-VTL1.0, and OECD guideline 207 Methods. LC50 of RAPID MAX were (1687.56±50.53 mg of glyphosate (a.e.) /kg of soil (DW) for adult earthworms and 1416,99±53,06 mg of glyphosate (a.e.) /kg of soil (DW) for juvenile earthworms. LC50 of TAKO-KELE 757 SG were 2215.66±61.83 mg of glyphosate (a.e.) /kg of soil (DW) and 1658.62±38.72 mg of glyphosate (a.e.) /kg of soil (DW), respectively for adult and juvenile earthworms. Juvenile and adult earthworms were more sensitive to RAPID MAX 750 WG compared with TAKO-KELE 757 SG, as LC50 related to RAPID MAX 750 WG were lower than those of SG TAKO-KELE 757 SG. The acute toxicity (lethality) of both herbicides was more severe on juvenile earthworms.

The preservation and consumption of food of animal origin requires pickling, smoking or cooking techniques. In Côte d'Ivoire, particularly in Abidjan, in the communes of Abobo and Port-Bouët, the stripping of beef hides with fuels such as used tires, rubber debris and rubberwood is a widespread practice. The "kplo" or treated and smoked beef skin is highly prized. The same is true for the "choukouya", beef, sheep or goat meat cooked in artisanal metal ovens fuelled mainly with rubberwood in the communes of Port-Bouët and Yopougon. These practices generate fumes containing entities that are toxic to human food, including trace metal elements (TMEs), which are carcinogenic or mutagenic. The objective of this study is to assess the risks associated with the consumption of meat and offal (skins) contaminated with TMEs. A dietary frequency-based survey was conducted. Sixty (60) skin samples and 120 meat samples were taken. Analysis was performed by atomic absorption spectrophotometry. The results show that rubber wood and used tires are the most commonly used fuels. Among the metals investigated, lead had a daily exposure (6.52 µg/kg bw/d) above its ADI (3.5 µg/kg bw/d). The hazard ratio of 1.86 greater than 1 for lead indicates the occurrence of threshold adverse effects. ERIs greater than 10-5 indicate the occurrence of carcinogenic or mutagenic effects.

The study was carried out on tomatoes (Lycopersicon esculentum P. Mill) and cabbages (Brassica oleracea L. var capitata) grown in Daloa. It covered ninety samples of vegetables including 60 tomato samples and 30 samples of cabbage collected during three field campaigns in a locality in Côte d'Ivoire (Daloa). These samples were processed using a SHIMADZU brand liquid chromatograph to determine pesticide residues. The results revealed contamination of tomatoes (Lycopersicon esculentum P. Mill) and cabbages (Brassica oleracea L. var capitata). Four pesticide residues, three of which belong to the organophosphorus family (chlorpyrifos, dimethoate, profenophos) and one from the pyrethroid family, were detected in tomatoes with detection percentages of 39%, 25%, 22% and 14%. The results of the analysis also showed the presence of four other pesticides including two from the organophosphorus family (profenophos and diazinon) and two others from the Carbamate family (carbaryl and dithiocarbamate) in cabbages with a rate of detection of 10% and 27%, 10% and 53% respectively. However, the remaining pesticide levels detected in tomatoes and Daloa cabbages are all below the Codex Alimentarius Standards (MRLs).

This study consisted in optimizing the adsorption capacity of activated carbon from the peanut shell for the removal of the yellow dye 11 (CJ 11) in solution. The active carbons are derived from the peanut shells of the subspecies hypogaea (Arachis hypogaea ssp.hypogaea) of the Virginia type derived from Mankono and subspecies fastigiata (Arachis hypogaea ssp. fastigiata) of the Spanish type from Kani. and Séguela. Peanut shells underwent pyrolysis preceded by chemical impregnation with orthophosphoric acid. The analysis of the results indicates that for the preparation of an optimal activated carbon from the Virginia sub-species hypogaea (Arachis hypogaea ssp. hypogaea) from Kani, an acid concentration of 30% are required and carbonization temperature at 600 ° C for 3 h. This active carbon, which has a predominantly acid surface (92.7% of the total surface area), has an ash content of 3.1%, a degree of activation of 24%, an iodine value of 955.04 mg / g and a surface area of 706.92 m2 / g. The adsorption tests reveal that the Spanish-derived fastigiata (Arachis hypogaea ssp. fastigiata) derived from kani adsorbs the yellow dye better than the other two. And this adsorption capacity increases with the optimal conditions of preparation.