بررسی روند تغییرات فصلی آلودگی فلزات سنگین در رودخانه بادآور لرستان

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانش آموخته کارشناسی ارشد گروه محیط زیست، دانشکده منابع طبیعی و محیط زیست، دانشگاه ملایر، ایران

2 استادیار گروه محیط زیست، دانشکده منابع طبیعی و محیط زیست، دانشگاه ملایر، ایران

چکیده

مطالعه حاضر به منظور بررسی وضعیت آلودگی رودخانه بادآور در شهرستان نورآباد لرستان با اندازه‌‌گیری غلظت فلزات سنگین روی، سرب و مس در دو فصل بهار و پاییز صورت گرفته است. نمونه‌‌های رسوب توسط ترکیبی از اسید ‌‌نیتریک، اسید پرکلریک و اسید کلریدریک به نسبت 6:2:2 در دستگاه هضم‌‌کننده آماده شد. سپس غلظت فلزات توسط دستگاه جذب اتمی مورد اندازه‌‌گیری قرار گرفت. نتایج حاصل نشان داد که میزان سرب، روی و مس در نمونه‌‌های رسوب پاییز به ترتیب 655/15، 072/51 و 762/17، در نمونه‌‌های بهار به ترتیب 811/20، 638/49 و 641/61 میلی‌‌گرم بر کیلوگرم می‌‌باشد. با اندازه‌‌گیری شاخص‌‌های کیفیت رسوب (بار آلودگی، غنی‌‌شدگی، زمین انباشت مولر، ریسک اکولوژیک و درجه آلودگی اصلاح شده) در دو فصل، میزان آلودگی رسوبات منطقه به فلزات سنگین (سرب، روی و مس) در سطح پایینی قرار داشت. همچنین در این مطالعه میزان pH، TOC و EC نمونه‌‌های رسوب اندازه‌‌گیری شد. مطابق نتایج به دست آمده در رسوبات فصل پاییز، بین غلظت فلزات سنگین و کل کربن آلی ارتباط مثبت و معنی‌داری وجود داشت. در نهایت لزوم پایش و کنترل آلودگی این رودخانه مورد تاکید قرار می‌‌گیرد.

کلیدواژه‌ها


عنوان مقاله [English]

Investigation of Trending Heavy Metals Contamination of Seasonal Changes in the Badavar River, Lorestan

نویسندگان [English]

  • Somayeh Rahimi 1
  • Samar Mortazavi 2
1 Graduated of Master Science of Environmental Department, Natural Recourses and Environmental Science, Malayer University, Iran
2 Assist. Profe. of Environmental Department, Natural Recourses and Environmental Science, Malayer University, Iran
چکیده [English]

The present study was carried out to determine the pollution status of Badavar River in Norabad city of Lorestan by measuring the heavy metals (Zn, Pb and Cu) concentrations in the two seasons of spring and autumn. The sediment samples were prepared in a digestive tract by a combination of Nitric acid, Perchloric acid and Chloride acid in a ratio of 6: 2: 2. Then, the concentration of metals was measured by an atomic absorption device. The results showed that Lead, Zinc and Copper levels in autumn sediment samples were 15.55, 51.072 and 17.762 mg/Kg, in spring samples, respectively, were 20.811, 49.638, and 61.641 mg/Kg. Measurement of sediment quality indexes (pollution load, enrichment, geo accumulation Index, ecological risk and degree of contamination) in two seasons, the contamination of heavy metals (lead, zinc and copper) were at the lower level. In this study, the pH, TOC and EC values of sediment samples were also measured. According to the results of autumn sediments, there was a positive and significant relationship between the concentration of heavy metals and total organic carbon. Finally, the need to monitor and control the pollution of the river is emphasized.

کلیدواژه‌ها [English]

  • heavy metals
  • Trending
  • Ecological Risk
  • Geo accumulation index
  • Badavar river
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