Determination of copper and zinc levels insome cereals in the local market

The concentrations of copper (Cu) and zinc (Zn) in samples of some cereals available at local markets in Syria weredetermined, after nitric digestion, using Atomic Absorption Spectrometry. The study showed that the heavy metals were present in all samples at different levels. The concentration of heavy metals varied from trace to higher concentration. The maximum level of copper (Cu) in the cereal samples was 0.426 mg kg-1 on dry weight basis, where the maximum level of zinc (Zn) in the cereal samples was 2.325mg mg kg- 1 on dry weight basis. The analytical results obtained for the heavy metals indicate that the copper and zinc were present in all samples at concentration well below the acceptable concentration recommended by the World Health Organization.

Determination of Copper and Zinc levels in some spices in local market

The concentrations of Copper (Cu) and Zinc (Zn) in samples of some spices available at some local markets in Syria were determined, after nitric digestion, using Atomic Absorption Spectrometry. The study showed differences in metal concentrations according to the edible part. Studied heavy metals were present in all samples at different levels. The concentration of Copper (Cu) and Zinc varied from trace to higher concentration. The maximum level of Copper (Cu) in the spices samples was 0.668 mg/kg. The maximum level of Zinc (Zn) in the spices samples was 2.523mg/kg. The analytical results obtained for the heavy metals indicate that the Copper and Zinc were present in all samples at concentration well below the acceptable daily intake recommended by the World Health Organization.

Determination of residues of certain pesticides in fruits of tomatoes collected from central vegetable market in Darr´aa City

In this research, 66 samples of tomatoes were collected from vegetables central market in Darr´aa city during the period extended between 20 October/2009 - 4 October/2010) to investigate the presence of 26 pesticide residues which belong to different chemical classes using Gas Chromatography instruments equipped with μECD, FPD, MSD detectors. QuEChERS extraction method was used for residue extraction from tomato samples. The detectors linearity and pesticide detection limits were determined for every pesticide studied, and the recovery for all pesticides ranged from 90.6 for fenvalerate to 105.5% for propargite. Results showed that 56.1% of tomato samples contained detectable residues and Chlorpyrifos and cypermethrin were the most detected pesticides, while amounts of propargite, methamidofos, cypermethrin, chlorpyrifos were the largest detected and mounted to 0.99, 0.15, 0.015, 0.012 mg/kg respectively as a median values. Residues of methamidofos in only 2 samples were above the European MRLs.,

A study about the solution of the cubic congruence module a prime and application it in cryptography

In This Paper we will determine the solution of the congruence and apply the results in cryptography.