naser koosej

This study aimed to measure the concentrations of lead and cadmium in the muscle tissue of Solen dactylus oyster in Tiab and Sirik areas located in Hormozgan province. To conduct this research, in the summer of 2018, 30 Solen dactylus oysters were collected from each of the mentioned areas and then bioassay operations were performed in the laboratory. Atomic absorption spectrophotometry was used to measure the concentration of lead and cadmium. Atomic absorption spectrophotometry was used to measure the concentration of lead and cadmium. The recorded results for the mean concentrations of lead and cadmium showed that there is a significant difference between Tiab and Siric stations (p≤0.05), And the highest mean concentrations of lead and cadmium were observed in oyster muscle tissue of knife handle, lead (0.761±0.065) and cadmium (0.506 ± 0.75) in the samples of Tiab station, respectively. The results show that factors such as the habitat of Solen dactylus affect the accumulation of heavy metals lead and cadmium, so that Tiab station shows higher pollution than Sirik station. On the other hand, the amount of these heavy metals in the oyster tissue of the knife handle at Tiab station is higher than the standard of the World Health Organization (WHO) and also in the Sirik region, the concentration of lead is lower and the concentration of cadmium is higher than the WHO. It turns out that the consumption of knife oysters both as shrimp food and by humans should be accompanied by health considerations.

Accumulation of heavy metals in aquatic ecosystems causes soft tissue destruction and weakens the immune system. On the other hand, consumption of contaminated fish causes several complications in humans. This study aims to measure the amounts of heavy metals lead, nickel, zinc, iron and copper in the edible tissue of gariz fish in islands (Qeshm, Hengam and Hormoz) of Hormozgan province. In the three mentioned regions, during the two seasons of summer and winter, a total of 180 samples were collected in 1398 (30 samples in each station and in each season separately). After bioassay, the concentration of heavy elements in the studied organ was measured using a flame atomic absorption device (Model 700Contr AA). The results showed that the highest mean concentrations of lead, nickel, zinc and copper were observed in Qeshm Island and iron metal in Hormoz Island and the lowest mean concentrations of metals were observed in Hengam Island. Metal concentrations in the analyzed samples were lower than international standards FAO, WHO, FDA, NHMRC and UKMAFF. Also, the level of potential risk and risk index for non-cancerous diseases in adults and children in the aquifer muscle tissue was less than 1. Therefore, it can be concluded that there are currently no problems for human health in terms of consumption of this fish.

In this study, coastal sediments of Qeshm, Bandar Khamir and Bandar Laft regions in Hormozgan province were studied to determine the level of contamination of heavy metals lead, nickel, zinc, iron and copper by natural processes or human activities. In order to identify environmental pollutants caused by heavy metals, shovel sampling was performed from the sediments of these areas to measure the concentration of heavy metals and determine the enrichment index. The location of the samples was determined using a GPS device and sampling of surface sediments (tidal zone) was performed at 30 stations in the study areas. Atomic absorption of flame spectrometry was used to determine the concentration of heavy metals. The results showed that the mean concentrations of heavy elements lead, nickel, zinc, iron and copper in all sampling stations showed a significant difference (p<0.05). In terms of concentration of studied elements in Qeshm region (copper: 33.76 ± 1.88, zinc: 85.44 ± 2.75, lead: 31.79±  1.23, nickel: 34.17 ± 2.29 and Iron: 38000±691.21 μg/g) compared to Bandar Khamir (copper: 26.84 ± 2.30, zinc: 77.54 ± 2.12, lead: 24.71±  1.37, nickel:25.82± 1.30 and iron: 36810± 482.882 μg/g) and Bandar Laft (copper: 22.74± 2.42, zinc: 65.22±2.61, lead: 19.93± 1.32, nickel: 21.70±2.06 and iron: 35560±1014.56 μg/g) had higher contamination. The results also showed that the metal enrichment factor is low in all sediment samples and in terms of Müller geochemical index, the degree of soil contamination is in the category of non-contaminated soils.

This study was performed to measure the amounts of heavy metals lead, nickel, zinc, iron and copper in tissue of Liza klunzingeri fishes of islands (Qeshm, Hengam and Hormoz) in Hormozgan province during summer to winter 2019. After biometry muscle tissues of 180 samples should be omitted were isolated and frizzed. Then the samples were prepared by acid digestion method and the amount of heavy metals was measured by using a flame atomic absorption device (700Contr AA model). The results should be omitted showed that the highest mean concentrations of studied metals (lead: 0.082 ± 0.009, nickel: 0.646± 0.07, zinc: 31.97±1.33 and copper: 0.881 ± 0.03 micrograms per gram)  were in Qeshm Island and the highest mean heavy metal concentration of iron (19.30± 0.75 Micrograms per gram) was in Hormoz Island and the lowest mean concentration of heavy metals (lead: 0.036 ±0.007, nickel: 0.348 ± 0.05, zinc: 15.13 ±1.06, copper: 0.657± 0.04 and iron: 12.13 ±0.4 Micrograms per gram)  were observed in Hengam Island. The concentrations of metals in the analyzed samples were lower than the international standards of the FAO, the WHO, the FDA, the Australian National Institutes of Health (NHMRC) and the UK Food and Drug Administration (UKMAFF) and statistically significant differences were observed. Also, the level of potential risk and risk index for non-cancerous diseases in adults and children in the muscle tissue of barley fish were less than 1. Therefore, according to the results of this study, the current use of this species of fish for human consumption will not pose a problem from the perspective of health and public health.

In recent years, anthropogenic and natural activities have caused high levels of metal contamination into the aquatic ecosystem. These pollutants can accumulate in the food chain. The present study examined the amount of metals such as lead ,Nickel, Zink, Copper and Iron in the muscle tissue of Silago Sihama because of their importance in three regions of the Hormozgan province.Sampling was done in three station (Qeshm, Khamir Port and Pol Port) and two seasons, winter and summer. After bioassay, the samples of Silago Sihama were prepared through Chemical digestion method and the amount of metals was measured using atomic absorption device. The results obtained for the concentration of metals (Pb, Ni, Zn, Cu and Fe) in muscle of short fish showed that, there were significant differences between stations (Qeshm, Khamir Port and Pol Port), and also between winter and summer seasons (p<0.05). In both cases in the winter and summer, lead ,Nickel, Zink, Copper and Iron concentrations in Qeshm were significantly higher than Khamir Port and pol Port. Comparison of the metal concentrations in fish muscle tissue shorts with standard values showed that the concentrations of lead, Nickel, Zink, Copper and Iron were lower than FAO, WHO and EPA standards. Food risk assessment of case study specie indicates that the consumption of Silago Sihama with the current consumption rate causes no danger to consumers from the viewpoint of lead, Nickel, Zink, Copper and Iron.

The present study examined the amount of metals such as lead, Nickel, Zink, Copper and Iron in the muscle tissue of shrimp (Metapenaeus affinis) because of their importance in three regions of the Hormozgan province. Sampling was done in three station (Qeshm, Khamir Port and Laft Port) and two seasons, winter and summer. Transported to the laboratory bioassay samples and then samples of muscle tissue was removed. After drying, powder and chemical digestion to determine the concentration of the study were measured by atomic absorption spectrometry. The results obtained for the concentration of metals (Pb, Ni, Zn, Cu and Fe) in muscle of short fish showed that, there were significant differences between stations (Qeshm, Khamir Port and Laft Port) (p<0.05). In both cases in the winter and summer, lead, Nickel, Zink, Copper and Iron concentrations in Qeshm were significantly higher than Khamir Port and Laft Port. Comparison of the metal concentrations in muscle tissue shrimp with standard values showed that the concentrations of lead, Nickel, Zink, Copper and Iron were lower than FAO, WHO and EPA standards. Food risk assessment of case study specie indicates that the consumption of shrimp with the current consumption rate causes no danger to consumers from the viewpoint of lead, Nickel, Zink, Copper and Iron.

Despite the increasing impact of heavy metal pollution in Persian Gulf due to urban growth and agricultural and petroleum activities, few studies have focused on the behavior and relationships of these pollutants in the biotic and abiotic components of aquatic environments. In this study, the amount of some metals (copper, iron, lead, cadmium, zinc and nickel) was determined in the tissues of fish from three locations (Qeshm, Khamir port and Laft port) of Persian Gulf.
Fish samples were caught in Aug 2015. After bioassay, the samples of short fish (Silago Sihama) were prepared through acid digestion method, and the amount of metals was measured using atomic absorption device (Scientific Equipment GBS).
There were significant variations among heavy metal accumulation levels (P The research results showed that heavy metal concentrations in the muscles of investigated species were also lower than the maximum levels set by law. Therefore, food risk assessment of the case study species indicated that consumption of short fish with the current consumption rate causes no danger to consumers from the viewpoint of zinc, nickel, cadmium, lead, copper and iron.