Studies regarding the influence of pedoclimatic conditions of 2009 year on various quality index for some corn populations

Agricultural sectors can cause environmental contamination, and various pollutants are involved including organic compounds and heavy metals, which need to be studied closely, since they are generally toxic to animals and plants. The main risk is contamination of the water supply or food chain via crops. Impact on agriculture is also arising from unintended adverse effects of herbicide, pesticides and even fertilizers uses on plant life. This paper studied the influence of pedo-climatic conditions of 2009 year on some quality index of various corn populations. Also, it was studied the influence of various chemical compounds use (e.g. fertilizers) on the some corn populations from EzareniIasi, and the followings quality index were analyzed for 30 corn populations: nitrogen, phosphorus and maw protein. The chemical analyses were done considering the harvested grains from 2009 on which after the flouring, the followings were analyzed: nitrogen was analyzed by Kjendal method, and phosphorus by spectrophotometer method. The results showed that there are some variations of nitrogen and crude protein from one population to another, thus for nitrogen it was measured concentrations within 0.56% and 2.2% N, while for phosphorous within 0.27% and 0.75% P. It was observed that for corn populations with a law concentration of nitrogen, the phosphorous concentration is within usual limits, and this conclude that the agro-fond has a deficit in azoth concentration

Thermodynamic study of Cd (II) sorption on soil

Sorption is a major process responsible for the fate of heavy metals in soils, since the mobility of heavy metals is directly related to their partitioning between the soil solid phase and soil solution. Among the heavy metals cadmium is one of the most toxic with adverse health effects. The objective of this study is to analyze the sorption of Cd(II) from aqueous solution on soil from the industrial area of the city of Iasi (Romania) as a function of temperature at natural pH of the solution using a batch technique. A maximum uptake of about 9.7 mg of cadmium per g of soil and aprox. 95 % removal of metal was observed at 20 g/L soil amount, 200 mg/L cadmium solution and 41 °C, with an equilibrium time of 24 hours. Sorption isotherm of Cd(II) on soil were represented by Freundlich and Dubinin-Radushkevich models and the parameters indicated that the sorption of Cd(II) increased with increasing temperature of the system. Enthalpy (ΔH0 ), entropy (ΔS0 ) and Gibbs free energy (ΔG0 ) were calculated from the temperature dependent sorption data, and the results indicated that the sorption of Cd(II) on soil is a spontaneous, feasible and endothermic process