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Co-Authors
- A. Purushottam
- B. V. S. R. Murty
- S. Chandra
- A. Syamala Rao
- P. C. Basu
- N. K. Sood
- G. Krishna Rao
- P. Madhusudhana Reddy
- B. Rajagopala Reddy
- J. Prakasa Rao
- A. Subrahmanyam
- D. John Devadas
- K. V. Srinivasa Rao
- P. Surya Rao
- Ch. Venkat Rao
- K. Arjunudu
- J. Prakasha Rao
- P. Chandra Rao
- P. Niranjan Babu
- D. Deva Varma
A B C D E F G H I J K L M N O P Q R S T U V W X Y Z All
Subba Rao, N.
- A Modified Sequential Extraction Technique and its Usefulness in Geochemical Exploration
Abstract Views :180 |
PDF Views:5
Authors
A. Purushottam
1,
B. V. S. R. Murty
1,
S. Chandra
1,
N. Subba Rao
2,
A. Syamala Rao
2,
P. C. Basu
2,
N. K. Sood
2
Affiliations
1 Chemical Division, Geological Survey of India, 4-3-542, Bogulkunta, Hyderabad 500001, IN
2 Division of Regional Integrated Survey, Geological Survey of India, 4-3-542, Bogulkunta, Hyderabad 500001, IN
1 Chemical Division, Geological Survey of India, 4-3-542, Bogulkunta, Hyderabad 500001, IN
2 Division of Regional Integrated Survey, Geological Survey of India, 4-3-542, Bogulkunta, Hyderabad 500001, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 25, No 7 (1984), Pagination: 414-426Abstract
Sequential extraction techniques for determination of trace metals associated with different phases in soils/stream sediments are being increasingly used for geochemical exploration in recent years. The existing techniques do not provide for the separate determination of Copper, Lead or Zinc present in the secondary mineral form, although in many soils and stream sediments, these metals exist in such phases. Based on laboratory studies, the sequential extraction technique suggested by Chao and Theobald (Jr) has been modified to include an additional step to provide for determination of Copper, Lead and Zinc present in their commonly occurring secondary mineral forms. Making use of the modified scheme, stream sediment samples from Ahobilam area in Cuddapah Proterozoic basin have been analysed. Metal contents of samples in the primary and secondary mineral phases were found to be good indicators for Pb and Zn mineralization in zones 2 and 3. Subsequent field check revealed Ph-Zn mineralization in t he above two zones.
- Intensity of Pollution of Groundwater in Visakhapatnam Area, Andhra Pradesh, India
Abstract Views :302 |
PDF Views:2
Authors
Affiliations
1 Department of Geology, Andhra University, Visakhapatnam 530003, IN
2 Department of Geology, Tribhuvana University, Khatmandu, NP
1 Department of Geology, Andhra University, Visakhapatnam 530003, IN
2 Department of Geology, Tribhuvana University, Khatmandu, NP
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 36, No 6 (1990), Pagination: 670-673Abstract
Hydrogeochemical study indicates that the intensity of pollution of groundwater was not so alarming up to 1975 in Visakhapatnarn area, but after that it rapidly increased due to sweeping growth of industrial and urban activities and lack of environmental protection.Keywords
Hydrogeology, Pollution, Groundwater, Visakhapatnarn Area, Andhra Pradesh.- Factors Affecting Optimum Development of Groundwaters in Crystalline Terrain of the Eastern Ghats, Visakhapatnam Area, Andbra Pradesh, India
Abstract Views :168 |
PDF Views:1
Authors
Affiliations
1 Hydrogeology Laboratory, Department of Geology, Andhra University, Visakhapatnam 530003, Andhra Pradesh, IN
1 Hydrogeology Laboratory, Department of Geology, Andhra University, Visakhapatnam 530003, Andhra Pradesh, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 40, No 5 (1992), Pagination: 462-467Abstract
Hydrogeological conditions in crystalline terrain of Visakhapatnam area of . the Eastern Ghats suggest that topography and fracturing are the predominant factors controlling well yields. This is supported by statistical analysis also. Incremental well yields for the wells are found to decrease with depth. Further. large diameter of the wens do not necessarily increase yielding capacity of wells. For groundwater development in the area. optimum depth and diameter of the wells are therefore recommended to be 25 -45 m and 10 cm respectively to reduce the capatilisation on them.Keywords
Groundwater Development, Eastern Ghats, Visakhapatnam, Andhnl Pradesh.- Lead and Cadmium in the Groundwaters of Visakhapatnam Area, Andhra Pradesh, India
Abstract Views :180 |
PDF Views:142
Authors
Affiliations
1 Department of Geology, Andhra University, Visakhapatnam-530 003, IN
1 Department of Geology, Andhra University, Visakhapatnam-530 003, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 43, No 4 (1994), Pagination: 471-474Abstract
High concentrations of lead and cadmium are reported for the first time in the groundwaters of Visakhapatnam area, attributable to increased human activities and lack of environmental protection. It suggests an urgent need for remedial measures to overcome future health hazards in this area.Keywords
Lead, Cadmium, Groundwaters, Visakhapatnam, Andhra Pradesh.Full Text
- Principal Component Analysis in Groundwater Quality in a Developing Urban Area of Andhra Pradesh
Abstract Views :236 |
PDF Views:3
Authors
Affiliations
1 Department of Geology, Andhra University, Visakhapatnam-530003, IN
2 Department of Geology, Hindu College, Guntur - 522 003, IN
1 Department of Geology, Andhra University, Visakhapatnam-530003, IN
2 Department of Geology, Hindu College, Guntur - 522 003, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 69, No 5 (2007), Pagination: 959-969Abstract
Principal component analysis (PCA) of the chemical variables of groundwater is employed to interpret the relationships with specific processes that control the quality of water. Groundwater samples collected from the Guntur urban area, Andhra Pradesh were analyzed for major ion chemistry. The PCA separates the chemical variables into three principal components, which together account for 77.20% of the total variance. The principal component-I (PC-I) is dominated by TDS, Na+, Cl-, SO42- and K+. The principal component-II (PC-II) is influenced by pH and CO32-. The principal component-III (PC-III) is governed by NO3-. These three principal components are identified with the processes of salinity, alkalinity and pollution, which are considered as lithologically and non-Lithologically controlled factor, lithologically controlled factor and non-Lithologically controlled factor, respectively.
Areal distribution of the principal component scores show that the higher positive scores of PC-I, PC-II and PC-III are randomly distributed, but do not coincide with one another, which suggest the local modifications of PC-I due to the regional flow system of groundwater, whereas PC-II and PC-III are the pathways of recharge zones via soil and anthropogenic activity operated independently, following the natural environmental hydrogeochemical evolution of groundwaters. Identification of these zones helps to take appropriate management measures to improve the quality of groundwater for sustainable development of the area.
Keywords
Principal Component Analysis, Groundwater Quality, Hydrogeochemical Processes, Guntur Urban Area, Andhra Pradesh.- Hydrogeochemistry and Groundwater Quality in a Developing Urban Environment of a Semi-Arid Region, Guntur, Andhra Pradesh
Abstract Views :267 |
PDF Views:2
Authors
Affiliations
1 Department of Geology, Andhra University, Visakhapatnam - 530 003, IN
1 Department of Geology, Andhra University, Visakhapatnam - 530 003, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 59, No 2 (2002), Pagination: 159-166Abstract
This paper describes the results of hydrogeochemistry and groundwater quality to generate baseline information on groundwater resources in the developing urban area of Guntur, Andhra Pradesh. The area falls under a semi-arid type of climate and consists of charnockites and alluvium. Groundwaters are mostly brackish type, having Na<sup>+</sup>:Cl<sup>-</sup>-facies, that are of meteoric origin. The waters are subjected to evaporation/evapotranspiration process under climatic influence aided by gentle slope, intensively irrigated lands and continued re-use and re-cycling of waters. This process tends to remove ions from the waters for formation of new clay minerals and precipitation of CaCO<sub>3</sub>.The soils in the area appear to have the ability to pick up these ionic species during the pre-monsoon season. In the subsequent post-monsoon period, the waters become more saline, which suggests that the ions are leachzd from soils by the infiltrating recharge waters and are added to the groundwater body. In accordance with the domestic and industrial water quality standards, these groundwaters are not safe. The urban authorities of the area, therefore, should take necessary ameliorative steps to overcome the adverse effects caused by the inferior quality of groundwater.Keywords
Hydrogeochemistry, Groundwater Quality, Urban Semi-Arid Region, Guntur, Andhra Pradesh.- Geochemistry of Carbonate Precipitation from the Groundwater in a Coastal Region
Abstract Views :165 |
PDF Views:0
Authors
N. Subba Rao
1,
K. V. Srinivasa Rao
1,
P. Surya Rao
1,
Ch. Venkat Rao
1,
K. Arjunudu
1,
P. Madhusudhana Reddy
2,
A. Subrahmanyam
3
Affiliations
1 Department of Geology, Andhra University, Visakhapatnam - 530 003, IN
2 Department Hyderabad of Geology, Dr. B. R. Ambedkar Open University, Hyderabad - 500 033, IN
3 Department of Geology, Hindu College, Guntur - 522 002, IN
1 Department of Geology, Andhra University, Visakhapatnam - 530 003, IN
2 Department Hyderabad of Geology, Dr. B. R. Ambedkar Open University, Hyderabad - 500 033, IN
3 Department of Geology, Hindu College, Guntur - 522 002, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 73, No 5 (2009), Pagination: 651-656Abstract
Groundwater samples were collected from a coastal region of Andhra Pradesh to assess the possible conditions of the formation of carbonates. The area experiences a semi-arid climate and is underlain by khondalites, over which the Quaternary sediments occur. The study of the geochemistry of groundwater indicates that groundwater is mostly of fresh, with alkaline nature. The study further suggest that the breakdown of feldspars as kaolinite during rock-water interaction, releases Ca2+. Soils/weathered products contribute high CO2 under the open system. The Ca2+ and CO2 are added to the groundwater through the infiltrating recharge water. They subsequently precipitate as fine-grained carbonates in the weathering profile due to evapotranspiration under a freshwater environment.Keywords
Groundwater Chemistry, Freshwater, Carbonates, Open System, Evapotranspiration, Coastal Region, Andhra Pradesh.References
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- SUBBA RAO, N., SRINIVASA RAO, K. V., JOHN DEVADAS, D., DEVA VARMA, D., THIRUPATHI RAO, B., SUBRAHMANYAM, A., ARJUNUDU, K., RATNAKANTABABU BABU, K. and VENKATAKRISHNA, T. (2007) Quality of groundwater in the coastal area of Visakhapatnam-Bhimunipatnam, Andhra Pradesh. Indian Jour. Geochemistry, v.22, pp.193-208.
- Hydrogeochemical Zoning in Crystalline Terrain and its Significance to Water Quality
Abstract Views :194 |
PDF Views:141
Authors
Affiliations
1 Hydrogeology Laboratory, Department of Geology, Andhra University, Visakhapatnam - 530003, Andhra Pradesh, IN
1 Hydrogeology Laboratory, Department of Geology, Andhra University, Visakhapatnam - 530003, Andhra Pradesh, IN
Source
Journal of Geological Society of India (Online archive from Vol 1 to Vol 78), Vol 49, No 6 (1997), Pagination: 715-719Abstract
Geochemical variations observed between shallow aquifer waters (SAW) and deeper aquifer waters (DAW) indicate better quality in DAW.Full Text