Study of nitrate and phosphate in eastern south Caspian Sea in spring and summer

Subject Areas : Marine Chemistry

P. Nejatkhah Manavi ¹ , A.A. Pasandi ² , M. Saghali ³ , N. Beheshtinia ⁴ , D. Mirshekar ⁵

1 - Faculty of Marine Sciences and Technology, Islamic Azad University, North Tehran branch
2 - Golestan State Fishery Office
3 - Golestan State Fishery Office
4 - Faculty of Marine Sciences and Technology, Islamic Azad University, North Tehran branch
5 - Department of the Environment

Received: 2016-11-06 Accepted : 2016-11-06 Published : 2009-11-22

Keywords: Salinity, pH, Caspian Sea, Nitrate, temperature, phosphate,

Abstract :

This study performed in  Caspian Sea in order to estimate nutrients includeing nitrate, phosphate and physicochemical factors (pH, temperature and salinity) from April to October in 2008 . Sampling have done in eastern south of Caspian Sea in seven transects in 56 station on surface water, 5 and 10 meter. The mean temperature, salinity and pH were 26.9°± 4.72° C,  12.13± 2.33 ppt and 8.69± 0.79 respectively. The mean nitrate was 0.061± 0.0161mg/l and phosphate was  0.017±  0.011mg/l. Min and Max of nitrate and phosphate were 0.021, 0.131 and 0.001, 0.096 mg/l respectively .The concentration of salinity, nitrate and phosphate were higher in compared to western south Caspian Sea. There was significant differences in nitrate concentration in transects (P<0.05), but the other parameters were not significantly different (P>0.05). There were not meaningful difference in all parameters upon surface waters, 5 and 10 m.   Results showed that the concentration of nitrate and phosphate have increased compared to past years.