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Pb detoxification in Equisetum diffusum
Deepak Pant1, Virbala Sharma1, Pooja Singh1
1School of Earth and Environmental Sciences, Waste Management Laboratory, Central University of Himachal Pradesh, Dharamshala, Himachal Pradesh 176215, India.
Toxicology Reports
|October 1, 2017
Summary
Himalayan horsetail (Equisetum diffusum) effectively removes lead from waste cathode ray tube powder. This aquatic plant bioaccumulates high lead concentrations, showcasing its potential for phytoremediation.
Area of Science:
- Environmental Science
- Biotechnology
- Plant Science
Background:
- Lead (Pb) contamination from waste cathode ray tubes (CRTs) poses environmental risks.
- Aquatic macrophytes are increasingly studied for phytoremediation capabilities.
- Equisetum diffusum, or Himalayan horsetail, is a potential candidate for metal detoxification.
Purpose of the Study:
- To investigate the efficacy of Equisetum diffusum in detoxifying lead from CRT waste.
- To quantify lead bioaccumulation in E. diffusum exposed to CRT powder.
- To elucidate the mechanisms of lead detoxification in silicon-containing plants.
Main Methods:
- Cultivation of E. diffusum in waste CRT powder.
- Lead concentration analysis using X-ray fluorescence (XRF) spectroscopy.
- Investigation of potential reaction intermediates and complex formation.
Main Results:
- E. diffusum demonstrated significant lead absorption from CRT powder over 90 days.
- Lead concentration in plant ash increased from 68 mg/kg to 7600 mg/kg.
- The study proposes monosilicic/monoplumbic acid intermediates and silicon-like phytochelatin complexes.
Conclusions:
- Equisetum diffusum is a highly effective plant for lead phytoremediation from contaminated CRT waste.
- The iso-electronic similarity between silicon and lead plays a crucial role in detoxification mechanisms.
- Silicon-containing plants possess unique functions for efficient metal detoxification.
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