Durgesh Tripathi

Publications (237) View all

• Article: Phytoremediation of Mercury and Arsenic from Tropical Opencast Coalmine Effluent Through Naturally Occurring Aquatic Macrophytes

  Virendra Kumar Mishra, Alka Rani Upadhyay, Vinita Pathak, B. D. Tripathi
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  ABSTRACT: Under the present investigation phytoremediation of mercury and arsenic from a tropical open cast coalmine effluent was performed. Three aquatic macrophytes Eichhornia crassipes, Lemna minor and Spirodela polyrrhiza removed appreciable amount of mercury and arsenic during 21days experiment. Removal capacities of these macrophytes were found in the order of E. crassipes > L. minor > S. polyrrhiza. Translocation factor (shot to root ratio of heavy metals) revealed low transportation of metals from root to leaves leading higher accumulation of metals in root as compared to leaves of the plant. It was evident from plant tissue analysis that mercury and arsenic up take by macrophytes had deteriorated the N, P, K, chlorophyll and protein content in these macrophytes. Correlations between removal of arsenic and mercury from mining effluent and its increase in plant parts were highly significant. Results favoured selected species to use as promising accumulator of metals.
  Water Air and Soil Pollution 04/2012; 192(1):303-314. · 1.63 Impact Factor
• Article: Comparative assessment of Azolla pinnata and Vallisneria spiralis in Hg removal from G.B. Pant Sagar of Singrauli Industrial region, India

  Prabhat Kumar Rai, B. D. Tripathi
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  ABSTRACT: The aim of the present work was to monitor the Hg pollution in water and sediments of G.B. Pant Sagar located in Singrauli Industrial Region, India and to suggest the efficient aquatic plants for its phytoremediation. The study assessed the comparative potential of a free floating water fern Azolla pinnata and submerged aquatic macrophyte Vallisneria spiralis to purify waters polluted by Hg. Six days laboratory experiments have been conducted to mark the percentage removal of Hg at initial concentration of 0.1, 0.5, 1.0 and 3.0mg L−1. The percentage removal of Hg was higher for A. pinnata (80–94%) than V. spiralis (70–84%). Likewise, the Hg accumulated in dry mass was much higher for A. pinnata and a high correlation (R 2 = 0.91 for A. pinnata and 0.99 for V. spiralis) was obtained between applied Hg doses and accumulated amounts in biomass. A concentration dependent decrease in chlorophyll a, protein, RNA, DNA and nutrients (NO3− and \textPO\text4\text3 - {\text{PO}}_{\text{4}}^{{\text{3 - }}}) uptake was detected in A. pinnata and V. spiralis due to Hg toxicity. The decrease was more prominent in Azolla than Vallisneria. The results recommended the use of A. pinnata and V. spiralis to ameliorate the industrial effluents (thermal power, chlor-alkali and coal mine effluent) contaminated with Hg.
  Environmental Monitoring and Assessment 04/2012; 148(1):75-84. · 1.40 Impact Factor
• Article: Biochemical responses in tree foliage exposed to coal-fired power plant emission in seasonally dry tropical environment

  Atul Prakash Sharma, B. D. Tripathi
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  ABSTRACT: A biomonitoring study was conducted to investigate the responses of plants exposed to power plant emission in a dry tropical environment. For this purpose, five sampling sites were selected in the prevailing wind direction (NE) at different distance to thermal power plant (TPP) within 8.0km range and a reference site was selected in eastern direction at a distance of 22.0km. The two most common tree species, Ficus benghalensis L. (Evergreen tree) and Dalbergia sisso Roxb. (deciduous tree) were selected as test plants. Ambient sulphur dioxide (SO2), nitrogen dioxide (NO2), suspended particulate matter (SPM), respirable suspended particulate matter (RSPM), dust-fall rate (DFR) and plant responses such as leaf pigments (chlorophyll a, chlorophyll b and carotenoids), ascorbic acid, sugar and sulphate–sulphur (SO42--S\textnormal{SO}_{4}^{2-}-\textnormal{S}) contents were measured. Ambient SO2, NO2, SPM, RSPM and DFR showed significant spatial and temporal variation at different sites. Considerable reduction in pigment (chlorophyll a, chlorophyll b and carotenoids) and sugar contents were observed at sites receiving higher pollution load. Ascorbic acid exhibited significant positive correlation with pollution load. Accumulation of SO42--S\textnormal{SO}_{4}^{2-}-\textnormal{S} in leaf tissue showed significant positive correlation with ambient SO2 concentration at all the sites. At the same time, SO42--S\textnormal{SO}_{4}^{2-}-\textnormal{S} showed significant negative correlation with pigment and sugar content. D. sisso Roxb. tree was found to be more sensitive as compared to F. benghalensis L. tree.
  Environmental Monitoring and Assessment 04/2012; 158(1):197-212. · 1.40 Impact Factor
• Article: Assessment of total suspended particulate matter-bound polychlorinated biphenyls in ambient air of a seasonally dry tropical urban-industrial area.

  Atul Prakash Sharma, B D Tripathi
  AMBIO A Journal of the Human Environment 06/2009; 38(3):175-6. · 2.03 Impact Factor
• Article: Magnetic Properties of Vehicle-derived Particulates and Amelioration by Ficus infectoria: A Keystone Species

  Sudhir Kumar Pandey, B. D. Tripathi, Santosh Kumar Prajapati, A. R. Upadhyaya, V. K. Mishra, P. K. Rai, A. P. Sharma
  AMBIO A Journal of the Human Environment 03/2009; · 2.03 Impact Factor