In the aquatic environment, much of anthropogenic or natural compounds are adsorbed on particulate matter and accumulate in sediment. Sediment can affect the bioavailability of contaminants and therefore toxicity. A transect was established along the river Mulungwishi, 12 stations were selected along this transect and water and sediment samples were collected for laboratory analysis. The results indicate a high concentration of elements in the study (Cu, Co, Pb, Fe, Mn, and Mg), particularly in sediments than in the water. Cu slightly exceeds WHO standards set at 2 mg / L, the station 7. Against the stations 4, 5, 6, 7, and 8 show high concentrations in sediments to Cu, Co. This is explained by the change in physicochemical conditions of rivers. In this case, it is the pH of the water, particularly when acid which facilitates the mobility of certain hazardous components and their transport along the river especially when the speed is great. By cons when the pH of the water is basic, some other elements precipitate and accumulate in sediment, increasing their concentrations, or of the risk of exposure of aquatic fauna, creatures and aquatic plants as well as the man who would exercise any activity on an exposed river has human pressure in all its forms.

It is currently noticed for the period of festivity of Christmas and New Year, an addition of table fowl in the diet of the Lushoise, even more stripped; its marketing is widespread in the large arteries and everywhere where there is an intense circulation. This study has like general objective, that to analyze the periodic marketing of table fowls in the town of Lubumbashi. To arrive there, the following specific goals were pursued: to identify the salesmen, the sold races, the places of sources, the constraints, to release the profit and the profitability of this activity.40 % of these salesmen except markets whose 77 actors were surveyed. The data were seized in Excel and the statistical analysis was made on the basis of language R version 2.15.0. (The descriptive analysis, the test of student with the threshold of 5% and the simple regression). The results obtained show that this activity is practiced by the women (79,0 %), detailing (92, 2 %), which practice the trade of the agricultural produce like principal activity (95,0 %) and which directs their capital in the sale of table fowls for the period of festivity of Christmas and new year. The results obtained show that this activity is practiced by the women (79,0 %), detailing (92, 2 %), which practice the trade of the agricultural produce like principal activity (95,0 %) and which directs their capital in the sale of table fowls for the period of festivity of Christmas and new year. This activity generates in 2 to 3 days an average profit of 172 789

Currently, Africa in general and Katanga in particular are facing a deterioration in the physical and social environment. This was attributed to the degradation of multifaceted all-out industrialization, the population explosion (with its pressure on land) and the multiple crises that plunge into extreme poverty. In Katanga potato to a net increase in importance and whose ecological requirements fit well with the environment. So in general, this work is to analyze the economic and financial profitability of the potato by sector approach in Lubumbashi mining hinterland, and in the specific outline it is to assess the socio demographic variability potato consumer, generate profitability and profit marketing (calibration) in the interim relative to the flow market, estimating the cost of production, labor productivity, soil and the producer price of the city of Lubumbashi. For the realization of this work, investigations were conducted on a random sample of 85 players in the sector. To achieve this, documentary techniques have contributed to the literary synthesis for the preparation of this work and the analysis of variance and Tukey's test was used to compare means of different parameters observed, thanks to the Mini software tab 16.It appears to say that the big producers break monopoly over small, the production cost is low. The intermediate second level to realize substantial profits, although profitability is comparatively negligible compared to the first level intermediaries who establish direct contacts with producers. Moreover, earnings fluctuated depending on the markets, so that some markets are benefited to the absence of obstacles increase the cost, if the toll taxes and customs. Variability share attributed to the potato market holds calibration varies independently of markets. According to this study, potato large caliber is the most profitable, as for consumers, the variability of households is perceived in terms of age, level of education; size and annual consumption frequency.

The center of Lubumbashi, the most urbanized space has now become a night market of agricultural and manufactured goods. That means it has now a double impact. On the one hand it degrades the beauty of the city and on the other hand, it allows the poor to fight against poverty and food insecurity. Thus, this article aims to identify the players involved in this activity, generate profitability, constraints and perspectives of actors. To achieve 67 Sellers were surveyed at 17:30 and 22:00 local time interval. The parameters analyzed are respectively: sociodemographic data (age, gender, marital status, educational level, occupation), invested capital, income, profitability, constraints and prospects. The results revealed that this activity is dominated by women (94.03%), married (64.18%) with a secondary level of study (61%), mean age 34