جستجوی مقالات مرتبط با کلیدواژه "ریسک اکولوژیکی" در نشریات گروه "آب و خاک"

In this study, the concentration of heavy metals in water and sediments in four stations of Chabahar Lagoon was investigated. Ecological risk index (RI), pollution load index (PLI), and land accumulation index (Igeo) were used to evaluate the ecological risk of heavy metals in the sediment environment. To evaluate the risk of these metals to human health, the hazard index (HI) for two age groups, adults and children  was used. The results showed that the highest value of the ecological risk index occurred in station 4 with a value of 38.73 and the lowest value occurred in station 1 with a value of 21.36. The calculated RI values for all stations were less than 150, indicating that they are in the low-risk range. The highest value of the pollution load index also occurred in station 4 with a value of 0.59, which shows that the sediments of all four stations were not polluted. However, Igeo values were less than zero, which indicates that the studied sediments are in the non-polluted range. Only station 4 had a value greater than zero and less than 1 for chromium, which is in the range of pollution, not polluted to moderate with this metal. Also, risk index values for minors and adults were calculated at each station. The highest value for minors and adults occurred at station 4 with values of 0.89 and 0.59, respectively. Although HI values are less than 1, minors are more exposed to these metals than adults. These results are very worrying for minors who are a vulnerable group in society.

Dusts contain heavy metals such as Pb, Zn, Cu, Cr, Cd and As that can threat humanchr('39')s health and environment. Therefore, the spatial distribution of heavy metals concentration and soil pollution monitoring and environmental quality protection seem to be essential. To assess heavy metals pollution level in Ahvaz street dust, 115 street dust samples were collected from main pedestrians. The samples were analyzed by Atomic Absorption (AAS). The pollution level was estimated based on the geo-accumulation index (Igeo), contamination factor (CF) and the enrichment factor (EF). The average concentration values of Pb, Zn, Cu, Cr, Cd and As were found to be 197.6, 150.1, 179.7, 101, 5.6 and 14.2 mg/kg, respectively. Pearsonchr('39')s correlation coefficient also indicated that Pb, Zn, Cu and Cr had a significant correlation showing similar possible anthropogenic sources. On the other hand, Cd and As showed a lower correlation with other metals, indicating that they belonged to the geogenic sources. The results of contamination factor, enrichment factor and geo-accumulation index also indicated that Pb, Zn, Cu and Cd had a high contamination level.  Also, areas with high population density, heavy traffic volume, and industrial activities exhibited a high level of heavy metals contamination.

Dust particles are suspended particles created from various natural and anthropogenic sources. Dust particles contain toxic metals, such as mercury (Hg), which can have harmful effects on the human health. In this study, to investigate the contamination level of Hg in the street dust in Ahvaz, 95 dust samples were collected from the pavements in the main streets. The concentration of Hg in the collected samples was determined by the atomic absorption method (ASS). The contamination level was estimated based on indicators such as contamination factor (Cf), enrichment factor (EF), geo-accumulation index (Igeo) and ecological risk index (Er). The concentration value of mercury ranged from 0.02 to 8.75 mg/kg with an average of 2.53 mg/kg. The results of pollution indicators showed that the level of Hg contamination in the street dust of Ahvaz was a high level of contamination. In addition, the results of ecological risk assessment indicated that the ecological risk of Hg in the study area was very high. Spatial distribution pattern of Hg concentration showed that in areas with high population density, high traffic volume and industrial activities, there was a high pollution level of Hg.