[Determination of mercury concentration in different tissues of coot [fulica atra], mallard [anas platyrhynchos] and great cormorant [phalacrocorax carbon]]

The heavy metals pollution in aquatic ecosystems especially mercury, always makes concern about health of aquatic organisms. So, the purposes of this study were determination of total mercury in different tissues of the three species of the most important water birds at north of Iran and comparison with world health standards. Generally, 51 birds were captured randomly. Then, samples of feather, liver, kidney and muscle were taken and the mercury concentrations were determined by Advanced Mercury Analyzer [Model; Leco, AMA 254]. The most amount of accumulated mercury was in great cormorant's liver [piscivorous species]. Means of mercury concentration in liver of great cormorant, mallard, and coot were 14.80, 2.05, 0.18; in kidney 12.00, 1.90, 0.17; in feather 6.57, 1.09, 0.23 and in muscle 8.67, 0.26, 0.09 mg/kg dry weight respectively. Means Comparison showed significant difference among all tissues [P < 0.05], But there were not significant difference between sexes [P > 0.05]. The levels of accumulated mercury in all tissues of great cormorant were more than the established limits by WHO, FAO and EPA. The other species had less use limitation, but mercury concentration in mallards was considerable. These results can be a serious warning for consumers these birds, especially vulnerable people

[Survey of heavy metals [Cd, Pb, Hg, Zn and Cu] contamination in sediment of three sites AZnzali wetland]

Anzali Wetland is one of the most important aquatic ecosystems of Iran which is located in south-west of the Caspian sea. This Wetland provides a suitable and non-market price habitat for valuable fish and aquatic animals which have an important role in the life cycle of this ecosystem. This study reports the results of some heavy metals contamination monitoring in superficial water of the Anzali Wetland, Iran. The samples were collected from three sites [east, center and west] of Anzali Wetland, in each site three stations existed and each sample replicated three times. The results showed high heavy metal levels in eastern site of wetland, where there were high levels of contamination. The mean of heavy metals concentration in sediment from Anzali Wetland were in order as Cd 157.023, Pb 3.646 and Hg 300.692 ng /g dried weight, Zn 186.953 and Cu 44.452 mg /g dried weight in eastern site. The concentration levels of heavy metals in three sites were in order as follows: Zn > Cu > Hg > Cd > Pb. Concentrations of heavy metals in eastern zone reflected metal loadings from anthropogenic sources located at and in the vicinity of the sampling sites

Investigation of cadmium and zinc level in human milk and it's related with industrial pollution in Lenjan region, Isfahan

Nowadays, human milk is a very important bioindex for biomonitoring of pollutants that its give much useful information about heavy metal concentrated in human body and amount of infant exposed with these pollutants. The aim of this study was to determine concentration of cadmium and zinc in the colostrums human milk from women living in the vicinity of a metal smelter and control area. In this research 63 numbers of human's milk Lenjan and 17 numbers of human's milk control area collected of this area hospitals four days after postpartum. The means of cadmium and zinc level in colostrums samples of Lenjan and control area region after four days after postpartum were 2.31, 0.772 micro g/l and 11.32, 5.568 mg/l, respectively. The estimate weekly intake of cadmium and daily intake zinc of breastfed infant in this study were in some case higher than provisional tolerance weekly intake [PTWI] recommended by FAO/WHO. The results of this study showed a significant mean difference in the average level of cadmium and zinc in breast milk of mothers of different groups living place of residence, but no significant differences in the different maternal age and weight groups were observed. Considering the parameters of the study questionnaire, the possibility that you can use rice Lenjan significantly increased zinc in breast milk has been