In this http://www.wessex.ac.uk/components/com_forme/uploads/ study, diazinon, as an organophosphorus pesticide, was measured in nine Abbandans (man-made wetland) in Mazandaran Province: Kharajisha, Ramenet, Esmaeelkola, Kordkola, Shrag-e-Larim, Anarmarz, Roshandan, Galeshkola and Langoor from April 2010 to March 2011. A total of 216 samples were taken from nine abbandans of the South Caspian lowland. Samples analyzed revealed that diazinon is observed frequently in aquatic ecosystems throughout the year in summer, mostly. All abbandans except Kharajisha have shown similar trend annually. Kharajisha as an aquatic system is fed by Babolroud River, which is exposed nearly three times to diazinon concentration than others in summer. In other seasons, it decreases gradually so that winter and spring have lower amount. Due to the vast expansion of agricultural fields in the study area, various contaminants such as diazinon are leached by rainfall, irrigation and drainage activities and finally are conducted to the adjacent rivers and abbandans. These findings indicate that diazinon is widespread in the environment and can possibly have adverse effects on aquatic ecosystem health. Thus, development of irrigation and drainage efficiency and some environmental observations under the small land holding condition could diminish the negative impacts and consequently serve the ecosystem balance in this region.
Key words: Diazinon, Babolroud, Talar, Siaroud, Ab-bandan.
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