Effluents from the textile industry and artisanal dyeing contaminate water resources. The objective of this work is to eliminate the dye safranin from the aqueous medium by adsorption on natural materials. The clay used comes from Daloa in the center-west of Côte d’Ivoire. It is ground and then dry sieved on a column of sieves with a diameter of between 45 μm and 2 mm. The balls are made with the diameter fraction between 45 and 125 μm. Thus, 40 mL of distilled water is added to 100 g of clay powder. The balls obtained (approximately 0.5 cm in diameter) are dried in an oven at 60°C for 24 hours, then calcined in the oven at 500°C for 2 hours. The experimental device is a glass column 64.4 cm high and 2.9 cm inside diameter surmounted by a separating funnel containing the solution to be treated. The samples from the adsorption tests are analyzed using an AQUALYTIC 800 brand UV-visible spectrophotometer. Mathematical models are applied to model the breakthrough curves. The results showed that breakthrough time and adsorption capacity increase with bed height (60, 240 and 420 min respectively for 8, 16 and 24 cm) and decrease with flow rate (240, 90 and 30 min respectively). for 2, 3 and 4 mL/min). The modeling of the different breakthrough curves shows that the models applied are able to describe the entire dynamic behavior of the column.

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).