Cadmium levels in poultry meat
A survey of cadmium (Cd) levels in poultry meat from polluted area of Eastern Slovakia is presented. Samples of poultry tissue (72 samples of breast muscle, leg muscle, liver and heart) were analysed for the presence of Cd on atomic absorption spectrophotometer (Unicam Solar 939). Mean values of cadmium in breast and leg muscle, liver and heart were 0.019; 0.021; 0.061; 0.099 mg/kg, respectively. On the basis of presented results of cadmium analyses it follows that its levels in poultry meat are below the highest permissible hygienic limits for Cd (muscle 0.1mg/kg; internal organs 0.5 mg/kg - Codex Alimentarum of the Slovak Republic No. 981/1996). The presented results are higher than those in unpolluted areas. The regular monitoring and control of poultry meat guarantee that a consumer is protected against unfavourable higher values of cadmium.
PROXIMATE COMPOSITION AND LEVELS OF TRACE METALS IN CHICKEN MEAT CONSUMED IN UYO METROPOLIS , AKWA IBOM STATE
This study was conducted to determine the proximate composition as well as the concentrations of Pb,Ni,Mn, As, Zn, and Cd in the muscles,liver and gizzards of chicken consumed in Uyo,Akwa Ibom State, Nigeria. Proximate analysis was done on the different parts of chicken using standard methods and the concentrations of Pb,Ni, Mn, As, Zn, and Cd were determined using atomic absorption spectrophotometry. The mean levels of trace metals were ranged between 0.210±0.014-0.268±0.014mg/kg for Pb; 0.342±0.017-0.437±0.033mg/kg for Ni; 0.483±0.221-0.518±0.025mg/kg for Mn; 0.030±0.025-0.048±0.002mg/kg for As; 2.567±0.025-2.981±0.06mg/kg for Zn; and 0.024±0.04-0.17±0.025mg/kg for Cd.The mean moisture contents of various parts were 67.03±0.03, 66.0±0.002 and 67.23±0.004% formuscle,liver and gizzard respectively. The protein content ranged from 26.22±0.005 -28.35±0.03%; 1.32±0.05-1.23±0.121% for ash; and 0.91±0.01-1.11±0.111% for fat. The results indicated that chicken meat in this study were rich sources of nutrients. The concentrations of trace metals in this study were below tolerance limits except Pb, which was slightly higher than the WHO/FAO permissible limit. Therefore, it can be concluded that chicken meat in Uyo, Akwa Ibom State has a high nutritional value and it is safe for human consumption.
A New Vacuum Pressure Infiltration CFRP Method and Preparation Experimental Study of Composite
In order to prepare a carbon-fiber-reinforced polymer composite (CFRP) with ideal microstructure and properties, a new vacuum pressure infiltration CFRP method is proposed based on an analysis of existing CFRP preparation process methods. Research on composite material preparation systems was carried out by using this new method principle. The system mainly includes a fiber pre-forming module, a vacuum heating infiltration module, a hot-press curing molding module, and a data acquisition control module. Under the conditions of natural curing at 0 MPa + 6 h + 25 °C, vacuum heating curing at –0.05 MPa + 30 min + 80 °C, and hot-press curing at 0.7 MPa + 5 min + 50 °C, a two-dimensional (2D) CFRP with excellent microstructure and properties was successfully prepared. Observing the microstructure of the prepared composite material, it can be found that the inside of the composite material was sufficiently and uniformly infiltrated, and common preparation defects such as holes and delamination were effectively controlled. Through the performance test, the bending strength of the material reached 790 MPa.