Dr.Venkatesha Raju K Assist.Prof-Enviro.Sc. - Academia.edu (original) (raw)

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Papers by Dr.Venkatesha Raju K Assist.Prof-Enviro.Sc.

The study focused on assessment of trace element accumulation in certain aquatic macrophytes and ... more The study focused on assessment of trace element accumulation in certain aquatic macrophytes and benthic organisms to be used as biomonitors. The macrophytes (Nymphae stellata, Vallesnaria spiralis, Pistia stratioles, and Aqatic neam) and benthic organisms (Crustacean, Mollusca and Annelida) collected during November 2011–April from river Cauvery, one of the main fresh water aquatic systems in the south of India. Microwave digested samples of discrete organs of macrophytes and the whole body of benthic organisms were analyzed for metal concentration using AAS-6300. Among the eight metals investigated, six (Fe, Pb, Ni, Cr, Cu, and Cd) were showed higher degree of accumulation in the root whereas, remaining (Mn and Zn) showed in stem and leaf respectively. Vallesnaria spiralis shows the greatest potential to acumulate Fe, Mn and Cu while Nymphe stellata showed the better ability to accumulate Zn and Cr. Cadmium found in Aquatic neam and Vallisnaria spiralis with very negligible concen...

In the present study water, sediment and soil samples of Cauvery basin was undertaken to evaluate... more In the present study water, sediment and soil samples of Cauvery basin was undertaken to evaluate the spatiotemporal variations in heavy metal concentrations between 2007 and 2009. The Line diagrams for individual heavy metals of the seasonal samples with standard deviation at p=0.05 were plotted to comprehend the seasonal and spatial fluxes and variations. The seasonal heavy metal concentration in river water was maximum for Fe, Zn, Mn, Cu, Co and Cd during pre-monsoon and Pb, Ni and Cr during post-monsoon season whereas, in the sediment samples higher concentration of Ni, Cr, Mn, Cu, Co and Cd was found during pre-monsoon and Fe Pb and Zn in post-monsoon. In the case of soil samples maximum concentrations of Fe, Pb, Zn, Cr and Co noticed during pre-monsoon, while Ni, Mn, Cu and Cd during post-monsoon. An exponential increasing trend from water to soil and to sediment was evident throughout the river stretch. The mean concentration for all the heavy metals in water was within the l...

International Journal of Innovative Research in Science, Engineering and Technology, 2013

The study focused on assessment of metal accumulation in certain aquatic macrophytes and benthic ... more The study focused on assessment of metal accumulation in certain aquatic macrophytes and benthic organisms to be used as biomonitors. The macrophytes and benthic organisms collected during April to May (2011) from river Cauvery, one of the main fresh water aquatic systems in the south of India. Microwave digested samples of discrete organs of macrophytes and benthic organisms were analyzed for metal concentration using AAS-6300. In macrophytes, among the eight metals investigated, six (Fe, Pb, Ni, Cr, Cu, and Cd) were showed higher degree of accumulation in root whereas, remaining (Mn and Zn) in stem and leaf respectively. Vallesnaria spiralis showed greatest potency to acumulate Fe, Mn and Cu, while Nymphe stellata showed the better ability to accumulate Zn and Cr. Cd was found only in Aquatic neam and Vallisnaria spiralis at downstream stations with very negligible concentration. Based on the accumulation level in macrophytes, the eight metals were arranged in the order of Fe> ...

Open Journal of Metal, 2013

This study was conducted during March to May of 2010 dry season, giving prime thrust to determine... more This study was conducted during March to May of 2010 dry season, giving prime thrust to determine the metal concentrations in commercial fish species of Catla catla and Labeo rohita, collected from various points along the river Cauvery. The liver, gill and muscle tissues of fish were analyzed for Fe, Pb, Zn, Ni, Mn, Cu, Cr and Cd using Atomic Absorption Spectrophotometry (AAS-model: 6300). The Catla catla has shown more accumulation potency for all the metals than Labeo rohita. The liver in both fish species has better accretion capacity compared to gill and muscle and the same was noticed by bioaccumulation factor. The results of bioaccumulation factor were in the order of Ni > Zn > Cu > Mn > Fe > Cr > Pb > Cd. Elevated trend was noticed among the essential metals and decreased trend among the nonessential metals were observed in both fish species.

Environmental Monitoring and Assessment, 2011

The purpose of this research work was to appraise extent of heavy metals in sediment and the degr... more The purpose of this research work was to appraise extent of heavy metals in sediment and the degree to which its quality tainted seasonally and spatially in river Cauvery. In this study, heavy metals such as Fe, Zn, Ni, Mn, Pb, Cu, Co, Cd and Cr were analysed in sediments. Results were compared with sediment quality guidelines from various derived criteria. Twenty-five sampling points were selected based on geographical proximity of agricultural fields and industrial discharges; river-tributary confluence points; settlements located along the river bank; ritual and recreational activities. Sampling was done for the period of 3 years (2007 to 2009). Digestion of the samples was done by microwave-assisted digestion technique. Analysis was carried out using flame furnace atomic absorption spectrophotometer, and results are expressed in micrograms per gram. The mean concentration of Fe (11144 μg/g) followed by Mn (1763.3 μg/g), Zn (93.1 μg/g), Cr (389 μg/g), Ni (27.7 μg/g), Cu (11.2 μg/g), Pb (4.3 μg/g), Co (1.9 μg/g) and Cd

The study focused on assessment of trace element accumulation in certain aquatic macrophytes and ... more The study focused on assessment of trace element accumulation in certain aquatic macrophytes and benthic organisms to be used as biomonitors. The macrophytes (Nymphae stellata, Vallesnaria spiralis, Pistia stratioles, and Aqatic neam) and benthic organisms (Crustacean, Mollusca and Annelida) collected during November 2011–April from river Cauvery, one of the main fresh water aquatic systems in the south of India. Microwave digested samples of discrete organs of macrophytes and the whole body of benthic organisms were analyzed for metal concentration using AAS-6300. Among the eight metals investigated, six (Fe, Pb, Ni, Cr, Cu, and Cd) were showed higher degree of accumulation in the root whereas, remaining (Mn and Zn) showed in stem and leaf respectively. Vallesnaria spiralis shows the greatest potential to acumulate Fe, Mn and Cu while Nymphe stellata showed the better ability to accumulate Zn and Cr. Cadmium found in Aquatic neam and Vallisnaria spiralis with very negligible concen...

In the present study water, sediment and soil samples of Cauvery basin was undertaken to evaluate... more In the present study water, sediment and soil samples of Cauvery basin was undertaken to evaluate the spatiotemporal variations in heavy metal concentrations between 2007 and 2009. The Line diagrams for individual heavy metals of the seasonal samples with standard deviation at p=0.05 were plotted to comprehend the seasonal and spatial fluxes and variations. The seasonal heavy metal concentration in river water was maximum for Fe, Zn, Mn, Cu, Co and Cd during pre-monsoon and Pb, Ni and Cr during post-monsoon season whereas, in the sediment samples higher concentration of Ni, Cr, Mn, Cu, Co and Cd was found during pre-monsoon and Fe Pb and Zn in post-monsoon. In the case of soil samples maximum concentrations of Fe, Pb, Zn, Cr and Co noticed during pre-monsoon, while Ni, Mn, Cu and Cd during post-monsoon. An exponential increasing trend from water to soil and to sediment was evident throughout the river stretch. The mean concentration for all the heavy metals in water was within the l...

International Journal of Innovative Research in Science, Engineering and Technology, 2013

The study focused on assessment of metal accumulation in certain aquatic macrophytes and benthic ... more The study focused on assessment of metal accumulation in certain aquatic macrophytes and benthic organisms to be used as biomonitors. The macrophytes and benthic organisms collected during April to May (2011) from river Cauvery, one of the main fresh water aquatic systems in the south of India. Microwave digested samples of discrete organs of macrophytes and benthic organisms were analyzed for metal concentration using AAS-6300. In macrophytes, among the eight metals investigated, six (Fe, Pb, Ni, Cr, Cu, and Cd) were showed higher degree of accumulation in root whereas, remaining (Mn and Zn) in stem and leaf respectively. Vallesnaria spiralis showed greatest potency to acumulate Fe, Mn and Cu, while Nymphe stellata showed the better ability to accumulate Zn and Cr. Cd was found only in Aquatic neam and Vallisnaria spiralis at downstream stations with very negligible concentration. Based on the accumulation level in macrophytes, the eight metals were arranged in the order of Fe> ...

Open Journal of Metal, 2013

This study was conducted during March to May of 2010 dry season, giving prime thrust to determine... more This study was conducted during March to May of 2010 dry season, giving prime thrust to determine the metal concentrations in commercial fish species of Catla catla and Labeo rohita, collected from various points along the river Cauvery. The liver, gill and muscle tissues of fish were analyzed for Fe, Pb, Zn, Ni, Mn, Cu, Cr and Cd using Atomic Absorption Spectrophotometry (AAS-model: 6300). The Catla catla has shown more accumulation potency for all the metals than Labeo rohita. The liver in both fish species has better accretion capacity compared to gill and muscle and the same was noticed by bioaccumulation factor. The results of bioaccumulation factor were in the order of Ni > Zn > Cu > Mn > Fe > Cr > Pb > Cd. Elevated trend was noticed among the essential metals and decreased trend among the nonessential metals were observed in both fish species.

Environmental Monitoring and Assessment, 2011

The purpose of this research work was to appraise extent of heavy metals in sediment and the degr... more The purpose of this research work was to appraise extent of heavy metals in sediment and the degree to which its quality tainted seasonally and spatially in river Cauvery. In this study, heavy metals such as Fe, Zn, Ni, Mn, Pb, Cu, Co, Cd and Cr were analysed in sediments. Results were compared with sediment quality guidelines from various derived criteria. Twenty-five sampling points were selected based on geographical proximity of agricultural fields and industrial discharges; river-tributary confluence points; settlements located along the river bank; ritual and recreational activities. Sampling was done for the period of 3 years (2007 to 2009). Digestion of the samples was done by microwave-assisted digestion technique. Analysis was carried out using flame furnace atomic absorption spectrophotometer, and results are expressed in micrograms per gram. The mean concentration of Fe (11144 μg/g) followed by Mn (1763.3 μg/g), Zn (93.1 μg/g), Cr (389 μg/g), Ni (27.7 μg/g), Cu (11.2 μg/g), Pb (4.3 μg/g), Co (1.9 μg/g) and Cd