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RISS 인기검색어
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- 저자 : Pradip Bhattacharyya (검색결과 2 건)
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Pradip Bhattacharyya,Kalyan Chakrabarti,Asish Chakraborty,Subhasish Tripathy,M.A. Powell 한국지질과학협의회 2008 Geosciences Journal Vol.12 No.1
Effect of addition of municipal solid waste compost(MSWC) on lead (Pb) content of submerged rice paddies wasstudied. Experiments were conducted during the three consecutivewet seasons from 1997 to 1999 on rice grown under submergence,tial extraction method was used to determine the Pb fractions inMSWC and decomposed cow manure (DCM). Lead was signifi-cantly bound to the organic matter (60%) and Fe and Mn oxidesin MSWC and DCM. Lead content (mg kg-1) in rice straw washigher than in rice grain. Lead bound with water soluble andexchangeable fractions in MSWC and DCM was best correlatedwith straw and grain Pb. Fe and Mn oxide bound Pb in both theorganics also significantly correlated with straw and grain Pb con-Pb in MSWC and DCM did not significantly corelate with Pbcontent in rice straw and grain metal. MSWC would be a valuableresource for agriculture if it can be used safely, but long-term fieldexperiments with MSWC are needed to assess by regular moni-toring of the metal loads and accumulation in soil and plants.
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Das, Pallabi,Barua, Shaswat,Sarkar, Shuvasree,Karak, Niranjan,Bhattacharyya, Pradip,Raza, Nadeem,Kim, Ki-Hyun,Bhattacharya, Satya Sundar Elsevier 2018 Journal of hazardous materials Vol.346 No.-
<P><B>Abstract</B></P> <P>Recently, concerns have been raised regarding the ultimate fate of silver nanoparticles (SNPs) after their release into the environment. In this study, the environmental feasibility of plant leaf (<I>Thuja occidentalis</I>) extract–mediated green SNPs (GSNPs) was assessed in terms of their effects on soil physicochemical properties and crop growth in comparison to conventionally synthesized silver nanoparticles (CSNPs). Upon application of GSNPs, soil pH shifted toward neutrality, and substantial increments were observed in water holding capacity (WHC), cation exchange capacity (CEC), and N/P availability. The mechanism behind the enhanced availability of N was verified through lab-scale experiments in which GSNP-treated soils efficiently resisted nitrate leaching, thereby sustaining N availability in root zone soil layers. However, retardation in nutrient availability and enzyme activity was apparent in soils treated with 100 mg kg<SUP>−1</SUP> of either CSNPs or GSNPs. Remarkable improvements in leaf area index (LAI), leaf number, chlorophyll content, nitrate reductase (NR) activity, and <I>Phaseolus vulgaris</I> pod yield were observed after the application of low doses of GSNPs (25–50 mg kg<SUP>−1</SUP>). The true benefit of GSNP application to soil was substantiated through experiments on plant uptake of nutrients, NR expression, and ferredoxin gene expression in <I>P. vulgaris</I> leaves.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The remarkable antimicrobial activity of silver nanoparticles (SNPs) is well known. </LI> <LI> Extensive industrial use of SNPs has led to their large-scale disposal as waste materials. </LI> <LI> The effects of SNPs on plant metabolism are assessed in terms of NR and Fd expression. </LI> <LI> We provide evidence of an overall beneficial impact of SNPs on soil properties. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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