علوم غیرزیستی دریا
Mahmoud Nassiri; Morteza Ziyaadini; Kamalodin Kor
Abstract
Abstract:Environmental pollution imposes serious hazards and problems to the living organisms. This study aimed to determine the concentration and seasonal alteration of di-(2-ethylhexyl) phthalate (DEHP) and di-n-butyl phthalate (DnBP) in the surface water of Chabahar Bay. Four replicated water samples ...
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Abstract:Environmental pollution imposes serious hazards and problems to the living organisms. This study aimed to determine the concentration and seasonal alteration of di-(2-ethylhexyl) phthalate (DEHP) and di-n-butyl phthalate (DnBP) in the surface water of Chabahar Bay. Four replicated water samples were taken from the surface layers of seven stations in Chabahar Bay and prepared by dispersive liquid–liquid microextraction (DLLME) method, before being injected into the Gas Chromatography with flame ionization detector. In this method, 0.5 ml of methanol (as diffusion solvent) and 20 µl of carbon tetrachloride (as extraction solvent) were injected quickly into the sea water samples, and after extraction, the deposited phase was taken by a Hamilton syringe and injected into the GC equipment for measurement. Under the optimum extraction and experimental conditions, the method yields a linear calibration curve in the concentration range from 10 to 600 µg/L for target analytes. The enrichment factors for DEHP and DnBP were 775 and 790, the correlation factor 0.997 and 0.997, the limits of detection were 0.04 and 1.78 µg/L and the relative standard deviations of DEHP and DnBP were 0.0036 and 0.058, respectively.The results revealed that the concentration of DEHP and DnBP differ considerably at different stations. Significant differences were also observed between the concentration of DEHP and DnBP at various stations (P ≤ 0.05).
علوم زیستی دریا
Morteza Ziyaadini; Ali Mehdinia; Zahra Yousofiyanpour
Abstract
Mollusks are remarkably appropriate as a bio-indicator due to their wide geographical distribution, high abundance in benthic environments, selective absorption of certain ions and their motionless nature. Chiton, a mollusk of the phylum of Polyplacophora, and of its lamyi species is abundant in Chabahar ...
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Mollusks are remarkably appropriate as a bio-indicator due to their wide geographical distribution, high abundance in benthic environments, selective absorption of certain ions and their motionless nature. Chiton, a mollusk of the phylum of Polyplacophora, and of its lamyi species is abundant in Chabahar Bay coastal rocks. Based on previous studies, this animal can be introduced as a potential indicator of Ecosystem Health; hence Chiton was chosen to be investigated rate of accumulation of metals, Cd, Cu, As and Hg in Chabahar Bay. After sampling four major stations, the samples were prepared and Cold Vapor Atomic Absorption apparatus were used for measurement of mercury and graphite furnace method was used for measuring other metals. Then, using the obtained data, bioaccumulation factor was calculated for each metal separately in the maximum amount of cadmium bioaccumulation factor at station 4 (Great sea) (136.34±0.02) and the lowest mercury at station 2 (Coast of Maritime University) (1.88±0.02), respectively. After statistical analysis of the results, it was found that Chiton can be introduced as a bio-indicator of the mentioned contaminants in the coast of Chabahar Bay.