Journal of School of Public Health and

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Background and Aim: The objective of this study was to determine the contents of heavy metals Hg, Cd and Pb in the muscle, liver and gill tissues of Liza abu fish in the Dez and Bahmanshir Rivers in Khoozestan Province, Iran in winter 2010. 

Materials and Methods: The study included 108 samples of Liza abu tissues. The metals were extracted from the tissues using the wet-digestion method and their concentrations were determined by atomic absorption spectrophotometer Perkin Elmer 4100. Analysis of the data was done using the SPSS17 software, the statistical test being the t-test ((p≤0.05).). 

Results: The highest concentrations (mg/Kg) of Hg (0.029±0.005), Cd (0.506±0.047) and Pb (1.07±0.096) were found in the gill and their lowest concentrations, 0.023±0.001, 0.346±0.040 and 0.903±0.030, respectively, in the muscle. The concentrations of Cd in the gull, muscle and liver were significantly different (p≤0.05) between the Dez and Bahmanshir River fish samples, but the differences with regard to Hg and Pb concentrations were not different between the 2 rivers (p≥0.05). 

Conclusion: The mercury content of Liza abu tissues was lower, while the lead and cadmium contents were higher, than the respective WHO standards (permitted levels).

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Background and Aim: Carbon footprint is an important health, safety and environmental issue that has received much attention by many researchers and studied during the last decade. This research was conducted to assess the carbon footprint and investigate the relationship between carbon dioxide emissions released in the atmosphere and energy consumption in Yadavaran oil field, Iran in 1396.
Material and Methods: Data were collected during the working hours and office hours in the spring and during the month of June, in 64 area offices, operating units, residential camps, and administrative and executive offices. Data for determination of energy consumption were collected and classified using an information-gathering form and field surveys, as well as interviewing the contractors (three interviews to ensure accuracy and precision of the results).
Results: Based on the data analysis the following results were obtained: 1. The total carbon dioxide emissions resulting from electricity consumption, generators consumption and transportation during one month were 1072794/24 KgCO2/Kwh, 5435478 KgCO2/L and 9342704/36 KgCO₂/L, respectively; 2. The total amount of carbon dioxide emissions was estimated in the Yadavaran oil field to be 190211719.2 KgCO₂/year; 3. The total energy consumption in one year was 52229043.92 GJ; 4. The monthly and annual energy consumption levels (BOE) were found to be 8.60 and 103.20 GJ/tone, respectively.
Conclusion: Based on the findings, it is recommended to do the following: 1. Provision of a transportation service for the personnel in Yadavaran oil field; 2. Training of the Yadavaran oil field contractors in the area of optimum energy consumption; 3. Proper management of fossil fuels and transportation in the Yadavaran oil field; 4. Connecting all the regions in the Yadavaran oil field to the city electricity system.

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Background and Aim:This research was conducted of determining and comparing the heavy metals of zinc, iron, manganese, copper, nickel and vanadium in summer in waters and sediments of Naseri wetland in Khuzestan province, 2017.
Material and Methods:Sampling of water and sediments from three areas of north, central and southern Naseri wetland was carried out in summer. In order to measure heavy elements, the ICP-OES model Varian 710-ES was used to measure the induction plasma (ICP) and its composition by mass spectrometry (ICP-MS).
Results:The average concentration of heavy metals in Naseri wetland water was obtained at station 3 above the first and second stations. Zinc, iron, copper and vanadium were lower in the wetland water than national and international standards, but higher levels of manganese and nickel were obtained. The average of the concentrations of the studied metals except the nickel in the surface sediments of the wetland in the second station was higher than the first and third stations. Ni was found higher in the sediments of the third station.
Conclusion:The results of calculating the contamination factor showed that heavy metals were zinc, iron, manganese, nickel, vanadium and copper in low pollution levels. The degree of contamination of the studied metals also showed that pollution of Nasseri wetland sediments was low. The degree of contamination of modified heavy metals indicates very low contamination of sediments of Naseri wetland. The ecological risk of zinc, iron, manganese, nickel, vanadium, and copper was in the low-risk category. The total ecological risk of heavy metals at the stations was also classified as low risk.