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RISS 인기검색어
- 검색키워드
- 저자 : Yogesh Chandra Sharma (검색결과 2 건)
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Deepak Gusain,Yogesh Chandra Sharma,Varsha Srivastava 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.3
Studies on the removal of copper by adsorption on modified sand have been investigated. The adsorbentwas characterized by XRD, FTIR and SEM. Removal of Cu was carried out in batch mode. The values ofthermodynamic parameters namely DG0, DH0 and DS0 at 25℃ were found to be -0.230 kcal-1 mol-1,+4.73 kcal-1 mol-1 and +16.646 cal K-1 mol-1, respectively. The process of removal was governed bypseudo second order rate equation and value of k2 was found to be 0.122 g mg-1 min-1 at 25℃. Theresultant data can serve as baseline data for designing treatment plants at industrial scale.
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Pandey, Lalit K.,Sharma, Yogesh Chandra,Park, Jihae,Choi, Soyeon,Lee, Hojun,Lyu, Jie,Han, Taejun Elsevier 2018 Aquatic toxicology Vol.194 No.-
<P><B>Abstract</B></P> <P>The aims of this study were to assess the biodiversity of periphytic diatom assemblages in fresh, brackish and marine waterbodies of Korea, and to assess the effect of environmental and anthropogenic factors on parameters such as the quantity and biovolume of lipid bodies and deformations of diatoms as early warning measures of anthropogenic impact. Diatom samples were collected from 31 sites (14 freshwater, 10 brackish and 7 marine), which included less impacted (upstream) and impacted (downstream) sites in each water type. Our results showed higher abundance and biodiversity of periphytic diatoms at the less impacted sites in terms of species richness, Shannon index, cell count and biovolume of the communities than at the impacted sites for freshwater and estuarine sites, but not for marine sites. 84 diatom species were noted in freshwater, 80 in brackish water and 40 in marine waters. In comparison to diatoms of the impacted sites, those of less impacted freshwater, brackish and marine sites had less lipid bodies (also less biovolume) and a lower percentage of teratological frustules, and showed more mobile forms in the community. Principal component analysis (PCA) also showed clear segregation of impacted from less impacted sites by the extent of the presence of lipid bodies (higher both in number and biovolume) and deformities in diatom frustules. Pearson correlation analysis revealed that lipid body induction and deformities were positively correlated with metals (Cd, Co, Cr, Cu, Fe, Pb and Zn) and nutrients (total phosphorus and total nitrogen), whereas they showed negative correlation with salinity, dissolved oxygen, suspended solutes and pH. Life-forms, lipid bodies and deformities in diatoms may be an effective biomonitoring tool for assessing biological effects of pollutants in non-marine aquatic ecosystems in Korea.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Diversity of periphytic diatoms from fresh, brackish and marine waterbodies from same biogeographical region was assessed. </LI> <LI> Taxonomical parameters of diatoms effectively differentiate impacted sites from less-impacted one. </LI> <LI> Lipid bodies and deformities in diatoms effectively defines the ecological health of fluvial ecosystem. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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