Mahdi Sadeghi; Noshin Noroozi; Ali Shahbazi
Abstract
Background and purpose: Water quality is an important factor that affects all aspects of eco-system and health food-to-business activities to the sustainability and health of the echo systemThis study was carried out with the aim of investigating the qualitative changes in the Ziarat River water. Materials ...
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Background and purpose: Water quality is an important factor that affects all aspects of eco-system and health food-to-business activities to the sustainability and health of the echo systemThis study was carried out with the aim of investigating the qualitative changes in the Ziarat River water. Materials and Methods: Samples from the Ziarat River Station (5 stations) were sampled each year in 2018. Samples were transferred to the Golestan University of Medical Sciences in accordance with the standard conditions, along with ice. The parameters of nitrate, phosphorus, biochemical oxygen demand (BOD), chemical oxygen demand (COD), ammonium, total hardness and total Fecal coliform was measured according to standard method and the Water Quality Index (WQI) was calculated. Results: The results of the study, based on the WQI index, showed that the index for all stations was between 29.68 and 64.78, and in some of them the average was (50-70) and some stations had poor quality ( 50-25). The most effective parameter on the water quality of the river is the BOD parameter, and then it is the total solids, turbidity, phosphate, nitrate and total Fecal coliform. Conclusion: The highest level of pollution in the terminal stations (4 and 5) due to more industrial activity is the entry of sewage and effluents into the river in Gorgan. Among the measured parameters of nitrogen and phosphorus as nutrients, if left unchecked, it poses a risk of eutrophication. Agricultural, livestock and recreational activities around the river affect the water quality of the river. So that a more appropriate quality was observed in the upstream stations. Considering that the Ziarat River is one of the most important sources of water supply needed in the agricultural and industrial sectors in Golestan province. Therefore, monitoring and control of pollutants entering this river is essential.
Mahdi Sadeghi; Sarah Jorjani; Ali Shahbazi; Kazem Babaei Ziyarati
Abstract
Background and Aim: Salinity is one of the most important factors affecting growth, photosynthesis and valuable metabolites regarding large scale cultivations. The aim of this research was studying the effect of salinity on growth and pigment composition of Chlorella sp. Collected from paddy-fields of ...
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Background and Aim: Salinity is one of the most important factors affecting growth, photosynthesis and valuable metabolites regarding large scale cultivations. The aim of this research was studying the effect of salinity on growth and pigment composition of Chlorella sp. Collected from paddy-fields of the Golestan Province for evaluating of the potentiality for large scale cultivation. Materials and Methods: Purification was done using N8 culture media at 2 uE.m-2.S-1 irradiance, 280C and continuous illumination at pH 7.2. Salinity treatments were Sodium Chloride at 0, 0.25.0.5 and 1% ( 17 to 170 mM) concentration. Survival and growth were assayed by turbidity, pigment composition as in vivo and in vitro were measured after normalization at the dry weight unit. Results: Results showed that the sharp increase in growth rate viewed at 5th day after inoculation at both control and treatments. Survivality would be keep at this salinity range. The optimum of growth and the highest degree of special growth rate were seen in 0.5% salinity. Difference between the growth at 0.5 and 1 % salinity were significant. The ability of carotenoide production at the 9th day after inoculation were significantly more than the other treatments and insignificant for chlorophyll production. Conclusion: The results show that Chlorella sp., have acclimatized potentiality against this degree of tension and regarding that would be considered as a suitable candidates for future bio fertilizer and soil conditioner inoculation in Golestan province. Document Type: Research ar