بررسی توانایی گیاه حرا (Avicennia marina) در کاهش فلزات سنگین (سرب، جیوه، وانادیوم و کبالت) موجود در آب منطقه عسلویه

نوع مقاله : مقاله پژوهشی

نویسندگان

1 استادیار گروه مهندسی محیط‌زیست، دانشکده محیط‌زیست، کرج، ایران

2 کارشناسی ارشد محیط‌زیست-آلودگی، دانشکده محیط‌زیست، کرج، ایران

3 استاد دانشکده منابع‌طبیعی دانشگاه تهران، کرج، ایران

4 دکتری تخصصی مهندسی محیط‌زیست، بوشهر، ایران

چکیده

وجود فلزات سنگین در بوم سامانه‌‌های آبی سال‌‌هاست که مشکلات محیط‌زیستی زیادی را به وجود آورده است. این عناصر در نتیجه عوامل طبیعی، فعالیت‌‌های صنعتی و فاضلاب‌‌های شهری وارد محیط می‌‌شوند و از طریق زنجیره غذایی در بدن آبزیان تجمع می‌‌یابند. گیاه حرا به واسطه توانایی خود در تجمع فلزات در اندام‌های خود نقش مهمی در زنجیره غذایی دارد. در این مطالعه توانایی گیاه حرا در جذب فلزات‌‌سنگین (وانادیوم، کبالت، سرب وجیوه) آلوده‌کننده منطقه عسلویه مورد بررسی قرار گرفت. این گیاهان از نهالستانی واقع در دیر تهیه شدند و بعد از قرار گرفتن در پایلوت با غلظت‌‌های 40، 50 میلی گرم در لیتر و 3200، 350 میکرو گرم در لیتر در pH برابر 8/7 از عناصر مذکور، به مدت چهارده روز مورد ارزیابی قرار گرفتند. نمونه‌‌های حاصل از اندام‌های گیاه در اسید غلیظ هضم شدند و غلظت فلزات در آن‌‌ها با استفاده از دستگاه جذب اتمی اندازه‌‌گیری شد. با توجه به نتایج تجربی در پالایش یون وانادیوم، جیوه و سرب با افزایش زمان، افزایش جذب توسط گیاه و درمورد کبالت با افزایش زمان کاهش جذب توسط گیاه همراه بود. در نهایت طبق نتایج تجربی بیشترین جذب توسط این گیاه، به ترتیب، مربوط به یون وانادیوم، جیوه، سرب و کبالت در pH برابر 8/7 صورت گرفت.

کلیدواژه‌ها

عنوان مقاله [English]

Investigating of the Mangrove Ability (Avicennia marina) to Reduce the Heavy Metals (Lead, Mercury, Vanadium and Cobalt) From Aqua in Assaluyeh Region

نویسندگان [English]

  • Somayeh Mohammadi 1
  • zahra shabani 2
  • Balghis Khorram 2
  • Afshin Danekar 3
  • Mahdi Tanha ziarati 4
1 Assist. Prof. of College of Environment, karaj, Iran
2 Ms.C of environmental engineering-pollution, College of environment, karaj, Iran
3 Prof. of Coastal Environment Department, Faculty of Natural Resources, College of Agriculture , University of Tehran, Karaj, Iran
4 Ph. D of Environmental engineering, Head of Environmental department, Pars Special Energy Zone, Asalouyeh, Bushehr, Iran
چکیده [English]

The existence of heavy metals in the aquatic ecosystem has caused several environmental problems for many years especially in the industrial regions. These elements enter the environment as a result of natural factors, industrial activities and urban sewage, and accumulate through the food chain in the body of aquatic organisms. The mangrove plant plays an important role in the food chain due to its ability to accumulate metals in its organs. In this study, the ability of mangrove plants to adsorb heavy metals (vanadium, cobalt, lead and mercury) which contaminating the Assaluyeh area was investigated. The plants were made from semi-finished seedlings located in Deir (Booshehr province) and treated in the pilot environment with concentrations of 40, 50 mg / L and 3200, 350 micrograms / liter of pollutants at pH 7.8 for 14 days. Samples which were collected from plant organs were digested in concentrated acid and the then concentration of metals was measured using atomic absorption spectrometry. Considering the experimental data it can be concluded the purification of vanadium, mercury and lead ions from aqua medium increase while adsorption of Cobalt ion decreases by increasing time. Finally, the highest absorption by this plant was related to vanadium, mercury, lead and cobalt ions, respectively, at pH 7.8.

کلیدواژه‌ها [English]

  • Heavy metals
  • Metal accumulation
  • Phytoremediation
  • Avicennia marina
  • Assaluyeh region

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پژوهش های محیط زیست
دوره 11، شماره 21
مجله پژوهشی
شهریور 1399
صفحه 261-272

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