Abstract

The most important aquatic ecosystems are freshwater rivers, which are considered as biodiversity and drinking water. In this regard, the quantitative and qualitative study of these resources is an important pillar of sustainable development. Gorganroud is one of the most important rivers in northeastern Iran; therefore the aim of this study was to study survey of Gorgnroud River water quality in Golestan Province using Water Quality Index (WQI). For this purpose, five sampling stations were selected along the Gorgnroud River, and samples were taken from April to August of 2015 every 45 days at sampling stations. The parameters of dissolved oxygen, nitrate, nitrite and PH were measured at each turn and the data were analyzed by WQI qualitative index. The results showed that the Water Quality Index at the first station (91/22); at the second station (85/51); at the third station (89.30); at the fourth station (87/14) and fifth station (81/11). The water quality index indicates that water quality of the Gorgnroud River was in a very good quality class during the spring and summer seasons.

Highlights

  • Water is a vital resource for any biological and human phenomenon and is one of the most important and fundamental sources for developing countries, those countries without any long-term plan regarding this specific source will not be able to enjoy more development and progress [12]

  • Based on the findings of the present study, there was a significant difference in the nitrate level of the Gorganroud River in Golestan province at different stations

  • The average amount of nitrate in the river water was 12.34 mg/L, which was reported as the amount of nitrate in surface water based on available resources and environmental standards were 1 mg/l [18]; more it has been the standard of the environment

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Summary

Introduction

Water is a vital resource for any biological and human phenomenon and is one of the most important and fundamental sources for developing countries, those countries without any long-term plan regarding this specific source will not be able to enjoy more development and progress [12]. The most important aquatic ecosystems are freshwater rivers, which are considered as biodiversity and drinking water. In this regard, the quantitative and qualitative study of these resources is an important pillar of sustainable development [7]. It can generally be stated that due to the increased utilization of river surface resources and the reduction of the flow due to reduced rainfall, climate change and increased pollution, Assessment of river health in different regions of the country and knowledge of the quality of water resources in conservation, planning and management of these resources is very important and from where that The WQI Water Quality Index is an attempt to provide a general response to water quality. The WQI measures the scope, frequency, and amplitude of water quality exceedances and combines the three measures into one score. The scores are ranked into one of the five categories described below: Excellent: (WQI Value 95 - 100)—Water quality is protected with a virtual absence of impairment; conditions are very close to pristine levels

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