Y Hamzeh, S Izadyar, E Azadeh, A Abyaz, Y Asadollahi,
Volume 4, Issue 1 (24 2011)
Abstract
Background and Objectives: The dyestuff manufacturing and textile industries consume a high volume of water and produce a great amount of wastewater containing various toxic substances. Different methods are used to remove dye compounds from wastewaters. Removal of dyes from water by adsorption processes received considerable attention and a number of studies focused on the adsorption of some dyes by non-conventional low cost and effective adsorbents. In this study, the suitability of the canola stalks for Acide orange 7 adsorption was assessed.
Materials and Methods: The dry canola stalks obtained from the research farm were milled and screened and the particles size ranged between 0.4-0.7mmwere used in all experiments. Acid orange 7 supplied by Alvan Sabet. Initially, the effects of initial dye concentration, pH and temperature on adsorption were examined. The kinetic and equilibrium data obtained for various concentrations of evaluated on the basis of Langmuir and Freundlich isotherms.
Results: The results showed that the absorption efficiency depended strongly on pH and slightly on the temperature. Absorption of acid orange 7 on the canola stalks was fairly rapid and more than 95% of adsorption occurred within the initial 5 minutes of the treatment. Both Langmuir and Freundlich models were applicable for the description of acid orange 7 dye adsorption by canola stalks.
Conclusion: According to the Langmuir model, the highest capacity of canola stalks for acid orange 7 adsorption was found 24.8 mg/g which was higher than the capacity of beech wood sawdust and soil mixture with fly ash.
Akbar Eslami, Hamzehali Jamali, Shirin Naderi,
Volume 6, Issue 2 (9-2013)
Abstract
Background and Objectives: Water is essential for sustaining life & adequate safe supplies must be accessible to the public. Nowadays, people prefer to purchase bottled water for reasons including taste, convenience, following fashion, and its safety and sanitary conditions. According to the WHO guideline, it is of great importance to control the bottled water because of keeping it for longer period of time and at higher temperature in comparison with the water of distribution networks, reusing containers and bottles without adequate washing and disinfecting, and more growth of microorganisms having less important in the terms of health. The aim of this study was to investigate the microbial and physicochemical quality of bottled water in the stores of Qazvin City and to compare the aforesaid features with national standards and to check the quality with the bottles label.
Materials and Methods: In this cross-sectional study, 51 samples of 11 bottled water brands with different production date were obtained. The features were studied in accordance with Standard Methods. Then, the data were analyzed by T-Test and one way ANOVA analysis using SPSS software. Eventually, the results were compared with the national standards, the WHO guidelines, and the product labels.
Results: Results showed lack of microbial contamination of the samples. Physically and chemically, all the parameters measured were below the national standards level. Study of conformity of the variables to the label indicated that mostly there was a significant difference between the values measured and the values listed on the product labels.
Conclusion: Although the concentration of microbial, physical and chemical features of samples were in the extent of national standards, there was a meaningful difference between labels and measured values so that the average concentration of TDS, TH, SO4-2, Ca2+, Mg2+ and Na+ would be more than the label values and the average of the other parameters was lower than the label values.
S Hamzeh Pour, S Vaziri, E Molaee Aghaee,
Volume 11, Issue 4 (3-2019)
Abstract
Background and Objective: Traditional cheese has desirable organoleptic characteristics for Iranian consumers. Escherichia coli, Staphylococcus aureus and Salmonella are some of the most important microbial agents in food poisoning and gastrointestinal infections, which can contaminate this product and endanger the health of consumers. The aim of this study was to survey the contamination rate and determination of antibiotic resistance of Staphylococcus aureus, Escherichia coli and Salmonella strains isolated from traditional cheeses distributed in Mahabad, Iran.
Materials and Methods: In a cross-sectional study, 100 samples of traditional cheese from the production and distribution centers in Mahabad city were randomly selected in 2016 to determine the bacterial contamination in accordance to national standard guidelines for the presence of Staphylococcus aureus, E.coli and Salmonella spp. Anti-biograms test was conducted using a standard disc diffusion method through the measurement of the inhibitory zone diameter on the Muller Hinton agar.
Results: Among the 100 samples, 54, 45 and 0 samples were positive for Escherichia coli, Staphylococcus aureus and Salmonella, respectively. All E.coli (100%) were found to be resistant to Amoxicillin, while Staphylococcus aureus isolates (100%) were resistant to Amoxicillin-Clavulanic acid and Amoxicillin. However, 66.6% isolates of E.coli were susceptible to Ceftriaxone and 97.7% isolates of Staphylococcus aureus were susceptible to Trimethoprim – Sulfamethoxazole.
Conclusion: The microbial quality of traditional cheeses distributed in Mahabad city was not evaluated as appropriate and the values did not meet the national standards. Thus, further monitoring and control are needed.
Ali Amoozadeh, Hamzeh Saghafi,
Volume 17, Issue 3 (12-2024)
Abstract
Background and Objective: In recent decades, the issue of crop product safety has led to develop methods for analyzing pollutants in crops. In the present study, ultra-trace amounts of lead (II) ions were measured in lettuce and water samples collected from Shahmirzad, located in Semnan province, an area known for its lead-containing mineral mines.
Materials and Methods: After sampling and pre-preparation, the lead content in each sample was extracted using solid phase extraction with modified silica gel. The recovery percentage of lead was then determined using atomic absorption spectroscopy.
Results: Optimization of key parameters such as pH, adsorbent amount, analyte flow rate, and volume resulted in a recovery rate of 104%. The experiments also demonstrated a very low limit of detection (LOD) of 1.14 ng/mL, a concentration factor of 250, high analyte selectivity of the adsorbent in the presence of interfering ions, and a high adsorbent capacity of 2.93 μg/g.
Conclusion: The evaluation of experimental data indicates that the current study provides a highly selective method that can be applied to the extraction and recovery of various analytes from different sample types.
