در هنگام جستجو کلمه در قسمت عنوان میتوانید کلمات مورد جستجو را با کاراکتر (-) جدا کنید.
کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Adsorption,Kinetics,biomass,Chromium (VI)
- چکیده:
- چکیده انگلیسی: The removing of hexavalent chromium from wastewater or decreasing its chromium (VI) content up to the permitted levels is important due to its non-biodegradation, bioaccumulation, and cancer-causing and toxic effects. In the present study, biosorption of Cr (VI) from aqueous solutions using canola was investigated. The various physicochemical parameters such as pH, initial Cr (VI) ion concentration, adsorbent dose, and equilibrium contact time were optimized in batch adsorption system. The results showed that the optimum amount of each parameter was as follows: initial concentration = 10 mg/l, pH = 3, contact time = 75 minutes, and adsorbent dosage = 5 g/l. The maximum adsorption efficiency was about 99.1%. The maximum adsorption capacity was calculated and was about 10.67 mg/g of adsorbent. Moreover, the sorption data was best fitted on the Langmuir isotherm model and adsorption kinetic is adopted with the pseudo-second-order model. The results of the present study suggest that canola can be used beneficially in treating aqueous solutions containing heavy metal ions.
- انتشار مقاله: 03-08-1393
- نویسندگان: Davoud Balarak,Yousef Mahdavi,Fardin Gharibi,Shahram Sadeghi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Iran,Liver,Mercury,Gills,Carps
- چکیده:
- چکیده انگلیسی: The purpose of this study was to monitor the concentrations of mercury in the edible muscle, gill, liver, and skin of common carp (Cyprinus carpio) and silver carp (Hypophthalmichthys molitrix), in the Sanandaj Gheshlagh Reservoir, Iran. Mercury concentrations were assayed using Shimadzu AA 6600 atomic absorption spectrophotometer, and the results were given as µg/g wet weight. The level of mercury in organs of silver carp was higher than in common carp. Moreover, the highest and lowest level of mercury has been accumulated in the gill and skin organs respectively. The results showed that the maximum allowable fish consumption rate for an adult person with mean 71.5 kg body weight were 21 g/day base on g/day based on mercury levels. In conclusion, results showed that the mercury concentrations in the edible muscle of both fish species are below levels of concern for human consumption.
- انتشار مقاله: 03-06-1393
- نویسندگان: Borhan Mansouri,Farshid Majnoni,Zahed Rezaei,Fardin Gharibi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: Zeolite,Escherichia coli,Biosorption,Nickel,Chromium,Biofilm
- چکیده:
- چکیده انگلیسی: Biofilm is communities of microorganisms attached to the surface and is able to concentrate metal species within their cell structure. Therefore, the aim of this study was to produce Escherichia coli biofilm on zeolite (clinoptilolite) and evaluate its ability for nickel (Ni) and chromium (Cr) adsorption from aqueous solutions. A laboratory-scale batch model was used for biodsorption assay. The effect of initial metal concentrations and pH on the removal efficiency was studied. Two isotherm equations were used for analyzing the experimental data. The results showed that Ni uptake by biofilm were higher than Cr. The biosorption process was best described by the Langmuir model. Fourier transform infrared confirmed that there are some functional groups on the biomass surface that may interact with the metal ions. It is concluded that the biofilm is very promising for the removal of metal ions from aqueous solution and hence may be encourage the utilization of biofilm in environmental applications.
- انتشار مقاله: 09-05-1393
- نویسندگان: Roya Ebrahimi,Shiva Zandi,Fardin Gharibi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Advances in Environmental Health Research
- نوع مقاله: Journal Article
- کلمات کلیدی: heavy metals,Vegetables,Daily Intake
- چکیده:
- چکیده انگلیسی: Concentration and daily intake (DI) of heavy metals [lead (Pb), chromium (Cr), cadmium (Cd) and copper (Cu)] were investigated in four common edible vegetables including coriander, dill, radish root and radish leaf grown at peri-urban sites in Sanandaj, Iran. A total of 120 composite samples of vegetables were taken from ten vegetable farms during six months from May to October 2012. Inductively coupled plasma optical emission spectroscopy (ICP-OES) was used to estimate the levels of heavy metals. The results showed that Pb and Cr concentrations exceeded the safety limits given by Food and Agriculture Organization (FAO) or the World Health Organization (WHO) for human consumption with the exception of copper and cadmium that were lower than the permissible leveling in all of the samples. Furthermore, the results showed that there was a significant variation in the levels of these metals among the examined vegetables (P < 0.001). DI values for Pb, Cu, Cr and Cd could be 0.1, 1.5, 0.94 and 0.004 mg per day, respectively. As respect, DI values for Pb and Cd were also below the international guideline bases. Although Pb level was higher than the permissible standard, it seems that daily intake of these vegetables may not have detrimental health hazards to consumers.
- انتشار مقاله: 13-05-1392
- نویسندگان: Afshin Maleki,Fardin Gharibi,Mahmood Alimohammadi,Hiua Daraei,Yahya Zandsalimi
- مشاهده
- جایگاه : پژوهشی
- مجله: International Journal of Pediatrics
- نوع مقاله: Journal Article
- کلمات کلیدی: children,Parents,Education,theory of planned behavior,Fissure sealant
- چکیده:
- چکیده انگلیسی: Background
Fissure sealant therapy is one of the most effective methods for preventing dental caries. This study aimed to investigate the effect of parental education on fissure sealant in the sample of Iranian preschool children.
Materials and Methods: This experimental study was conducted in Sanandaj, West of Iran, in 2019. A total of 120 parents of preschool children were randomly selected and divided into control (n = 60), and intervention (n = 60) groups. The required data were collected by a questionnaire based on the theory of planned behavior. It consisted of two sections: demographic information and theoretical constructs. The intervention group received four sessions of 45-60 minutes. Education was conducted through lectures and question and answer using pamphlets, brochures, and dental manikins. Data were analyzed using SPSS software version 20.
Results: The intervention and control groups were homogeneous before education. They were similar in terms of mean scores of the planned model. However, after an educational intervention, all the scores increased, including the mean attitude score (from 3.09±0.47 to 4.07±0.64), subjective norm score (from 3.2±0.45 to 3.90±0.52), perceived behavioral control score (from 3.172±0.31 to 3.73±0.40), behavioral intention score (from 3.33±0.58 to 4.40±0.62), practice score (from 0 to 19.41±0.6), and knowledge score (from 1.85±2.23 to 7.17 ±1.31). Besides, the difference was statistically significant (p <0.05). Also, changes in model constructs and knowledge were statistically significant in two groups (p <0.05).
Conclusion
According to the results with implementing four educational intervention sessions based on the theory of planned behavior on fissure sealant can help increase the fissure sealant rate.
- انتشار مقاله: 22-03-1399
- نویسندگان: Khadijeh Einolahzadeh,Arezoo Fallahi,Fardin Gharibi,Afshin Bahmani
- مشاهده