گیاه پالایی فلزات سنگین نیکل، کادمیوم و سرب در سواحل خلیج‌فارس با استفاده از گیاه حرا (Avicennia marina)

نوع مقاله : مقاله پژوهشی

نویسندگان

1 دانشجوی دکترا، گروه محیط زیست، دانشکده علوم پایه، واحد همدان، دانشگاه آزاد اسلامی، همدان، ایران

2 استادیار، گروه محیط زیست، دانشکده علوم پایه، واحد همدان، دانشگاه آزاد اسلامی، همدان، ایران

3 دانشیار، گروه محیط زیست، دانشکده علوم پایه، واحد همدان، دانشگاه آزاد اسلامی، همدان، ایران

4 استاد، گروه محیط زیست، دانشکده علوم پایه، واحد همدان، دانشگاه آزاد اسلامی، همدان، ایران

چکیده

گیاه‌پالایی یکی از مهم‌ترین روش­های زیستی پایدار جهت مقابله با اثرات روزافزون آلاینده­ها است. در این پژوهش کارایی گیاه حرا (Avicennia marina) جهت پالایش فلزات سنگین سرب، کادمیوم و نیکل از محیط­های آبی موردبررسی قرار گرفت. برای نمونه‌برداری از گیاه حرا و رسوبات در سال 1398، 20 ایستگاه در سراسر تالاب خورخوران واقع در غرب بندرعباس مشخص و اقدام به جمع‌آوری نمونه از آب، رسوب و بخش‌های مختلف گیاه گردید. بر اساس نتایج پژوهش، بیش­ترین تجمع فلزات با مقدار mg/kg 38/4 در ریشه درخت حرا مربوط به سرب و کم­ترین تجمع فلزات با مقدار  mg/kg 261/0 در ریشه درخت حرا مربوط به کادمیوم بود. نتایج ضریب انتقال برای عناصر سرب و کادمیوم در ریشه درخت حرا بزرگ‌تر از 1 و برای نیکل کم­تر از 1 به­دست آمد. همچنین بین پارامترهای pH و دما با میانگین غلظت تمامی فلزات سنگین در رسوب و بین EC با میانگین غلظت تمامی فلزات سنگین به‌جز نیکل در آب همبستگی معنی­دار آماری وجود داشت (05/0 P>). با توجه به نتایج، اختلاف در غلظت فلزات در بافت برگ و ریشه گیاه حرا ممکن است به­دلیل تفاوت در ساختار فیزیولوژیکی بافت­ها باشد؛ بنابراین، به نظر می­رسد ریشه درخت حرا نسبت به برگ آن برای پالایش فلزات سنگین مناسب­تر است.

کلیدواژه‌ها

موضوعات


عنوان مقاله [English]

Phytoremediation of Heavy Metals Nickel, Cadmium and Lead in the Coasts of the Persian Gulf Using Mangrove (Avicennia marina)

نویسندگان [English]

  • Abed Babak Baharvand 1
  • Maryam Kiani Sadr 2
  • Bahareh Lorestani 3
  • Mehrdad Cheraghi 3
  • Soheil Sobhan Ardakani 4
1 PhD Scholar, Department of Environment, College of Basic Science, Hamedan Branch, Islamic Azad University, Hamedan, Iran
2 Assist. Professor, Islamic Azad University, College of Basic Science, Hamedan Branch, Department of Environment, Hamedan, Iran
3 Assoc. Professor, Department of Environment, College of Basic Science, Hamedan Branch, , Islamic Azad University, Hamedan, Iran
4 Professor, Department of the Environment, College of Basic Sciences, Hamedan Branch, Islamic Azad University, Hamedan, Iran
چکیده [English]

Phytoremediation is one of the most important sustainable biological methods to deal with the increasing effects of pollutants. In this study, the efficiency of Avicennia marina for refining heavy metals such as lead, cadmium and nickel from aqueous media was investigated. For sampling of mangroves and sediments in 2019, 20 stations throughout Khorkhoran wetland located in the west of Bandar Abbas were identified and samples were collected from water, sediments and different parts of the plant. According to the results, the highest accumulation of metals with a value of 4.38 mg/kg in the root of mangrove was related to lead and the lowest accumulation of metals with a value of 0.261 mg/kg in the root of the mangrove was related to cadmium. The results of transfer coefficient for lead and cadmium in mangrove roots was greater than 1 and for nickel less than 1. Moreover, there was a statistically significant correlation between pH and temperature parameters with the mean concentration of all heavy metals in sediment and between EC and the mean concentration of all heavy metals except nickel in water (P> 0.05). According to the results, the difference in the concentration of metals in the leaf and root tissue of mangroves may be due to differences in the physiological structure of the tissues; Therefore, mangrove roots seem to be more suitable than heavy leaves for refining heavy metals.

کلیدواژه‌ها [English]

  • heavy metals
  • Mangrove Plant
  • Transfer coefficient
  • Wetlands
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