Significance of pCO2 values in determining carbonate chemistry in groundwater of Pondicherry region, India

Chidambaram, S.; Prasanna, Mohan Viswanathan; Karmegam, U.; Singaraja, C.; Pethaperumal, S.; Manivannan, R.; Anandhan, P.; Tirumalesh, K.

doi:10.1007/s11707-011-0170-5

Cited by 41 publications

(10 citation statements)

References 19 publications

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“…K in rock to the Ca ? Mg in groundwater is less notable (Chidambaram 2000). More than 60 % of samples fall in (Na ?…”

Section: Residual Sodium Carbonatementioning

confidence: 95%

“…The atmospheric log pCO 2 value is around -3.75 (Raymahashay 1986). Water with high pCO 2 of around -1.5 results due to deep circulation of groundwaters, with lesser atmospheric interaction or due to higher saturation of carbonates, resulting from the interaction with the host rock of the material through which it flows (Chidambaram et al 2011). In mixed water, pCO 2 tends to decreases to the atmospheric value and this causes increase in saturation, suggesting that the mixing zone is an open system (Raymahashay 1986).…”

Section: Partial Pressure Of Carbon Dioxide (Pco 2 )mentioning

confidence: 99%

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A study on groundwater geochemistry and water quality in layered aquifers system of Pondicherry region, southeast India

et al. 2012

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Geochemical signatures of groundwater in the Pondicherry region, south India, were determined. The coastal aquifers are fragile and this situation becomes more intense in layered aquifer systems like that of the Pondicherry region. In this region, groundwater occurs in alluvium, Lower Cuddalore, Upper Cuddalore, Tertiary, Cretaceous and mixed aquifers. The geochemical signature of groundwater in these formations was studied by collecting 93 groundwater samples. The collected samples from specific formations were analysed for physical parameters, such as electrical conductivity (EC), pH and major ion concentrations, such as Ca, Mg, Na, K, Cl, HCO 3 , PO 4 and SO 4. The results of the analysis were interpreted with geology; the ionic concentrations in the groundwater vary spatially and temporally. The abundance of these ions are in the following order: Na [ Ca [ Mg [ K = Cl [ HCO 3 [ SO 4. Interpretation of analytical data shows that Ca-Na and Cl-SO 4-HCO 3 is the dominant facies in all the formations. Groundwater in the area is generally hard and fresh-brackish in most of the formations and brackish in nature in alluvium formation. The sodium absorption ratio shows that most of the samples are grouped under excellent category to good category in all the formations. The residual sodium carbonate also are in good category in all the formations. Chloro-alkaline indices reveal that the majority of samples show negative values in all the litho units indicating the exchange of Na and K in groundwater with Mg or Ca in rock. Scholler classification of water indicates that longer residence time of water with more prominent base exchange. High EC and TDS values in certain locations of alluvial, Upper Cuddalore and Cretaceous formations prove to be unsuitable for drinking and irrigation purposes.

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“…K in rock to the Ca ? Mg in groundwater is less notable (Chidambaram 2000). More than 60 % of samples fall in (Na ?…”

Section: Residual Sodium Carbonatementioning

confidence: 95%

Section: Partial Pressure Of Carbon Dioxide (Pco 2 )mentioning

confidence: 99%

A study on groundwater geochemistry and water quality in layered aquifers system of Pondicherry region, southeast India

et al. 2012

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“…Water with a high pCO 2 of around -1.5 indicates deep circulation of groundwater with a lesser amount of atmospheric contact or higher saturation of carbonate minerals. This results from the interaction of minerals in the country rocks through which it flows (Chidambaram et al 2011). The findings above imply that higher pCO 2 leads to higher bicarbonate concentrations in the groundwater, which in turn enhances the mobility of U and the associated species in groundwater of this district.…”

Section: Saturation Indexmentioning

confidence: 99%

Lithological and hydrochemical controls on distribution and speciation of uranium in groundwaters of hard-rock granitic aquifers of Madurai District, Tamil Nadu (India)

Thivya

Chidambaram

Keesari

et al. 2015

Environ Geochem Health

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Uranium is a radioactive element normally present in hexavalent form as U(VI) in solution and elevated levels in drinking water cause health hazards. Representative groundwater samples were collected from different litho-units in this region and were analyzed for total U and major and minor ions. Results indicate that the highest U concentration (113 µg l(-1)) was found in granitic terrains of this region and about 10 % of the samples exceed the permissible limit for drinking water. Among different species of U in aqueous media, carbonate complexes [UO2(CO3)(2)(2-)] are found to be dominant. Groundwater with higher U has higher pCO2 values, indicating weathering by bicarbonate ions resulting in preferential mobilization of U in groundwater. The major minerals uraninite and coffinite were found to be supersaturated and are likely to control the distribution of U in the study area. Nature of U in groundwater, the effects of lithology on hydrochemistry and factors controlling its distribution in hard rock aquifers of Madurai district are highlighted in this paper.

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“…Higher log pCO 2 values are observed in the upstream and midstream suggesting that additional CO 2 has been obtained from the sediments during water-rock interaction (i.e. Chidambaram et al 2011). The lowest pCO 2 values were observed in the downstream (sample points 9 and 10) slightly less than the atmospheric value of −3.5, indicating that the residence time of these water is considerably lesser, also perhaps mixing with additional fresh recharge water from other sources.…”

Section: Fig 4: Montage Of Two Photos Of Epiphreatic Cave Passage Atmentioning

confidence: 92%

Epiphreatic caves in Niah karst tower (NW Borneo): occurrence, morphology and hydrogeochemistry

Dodge-Wan

Prasanna

Nagarajan

et al. 2018

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IzvlečekUDK 551.444(595.43) D. Dodge-Wan, M.V. Prasanna, R. Nagarajan & A. Anandkumar: Jame epifreatične cone v kraškem stolpu Niah (severozahodni Borneo): pojavnost, morfologija in hidrogeokemija Epifratične jame nastajajo na meji med vadozno in freatično cono. Prepoznavanje epifreatičnih elementov v bloku dvignjenega masiva nam omogoča razbrati faze dvigovanja masiva oz. spuščanja erozijske baze, zato so epifreatične jame in procesi še posebno zanimivi. čeprav so o jamah stolpa Niah opravili številne študije, nobena od teh ne obravnava epifreatičnih jam ob vznožju kraškega stolpa. Ta študija obravnava epifreatične rove na ravni vodne gladine v stolpu Painted Cave v severozahodnem Borneu, kjer sicer poznamo več velikih jam. Delno potopljen rov je dolg več kot 480 m in preči stolp od vzhoda proti zahodu ter pri tem seka še več drugih, veliko večjih vadoznih jam. Epifreatični tok je povezan z več ponikalnicami in izviri, zanj so značilne nagle spremembe smeri, ki sledi vodilnim razpokam. Namen študije je povezati kemijo vode vzdolž toka in aktivne geomorfološke dejavnike. Vzorčenje in analize vode na desetih lokacijah so dali podatke o pH, električni prevodnosti, skupni raztopljeni snovi (TDS), raztopljenem kisiku, Eh ter o koncentraciji glavnih ionov, hranil in kovin v sledeh. Rezultati so pokazali, da sta raztapljanje matične kamnine in izpiranje organskih snovi prevladujoča dejavnika geokemije vode v kanalu. V sušnem obdobju je voda rahlo nenasičena na kalcit, a je agresivnost majhna, kar kaže na to, da glavna faza razvoja poteka v poplavnih obdobjih. To potrjujejo tudi morfologija rova in jamske skalne oblike v jami in ob vznožju kraškega stolpa. Ključne besede: kras, jama Niah, epifreatična cona, hidrogeokemija, vodna površina. Although the large and spectacular caves of Niah have been subject of much research and interest, the existence of small epiphreatic caves at the foot of the karst towers has not previously been documented in this region of NW Borneo. The study documents and reports an epiphreatic cave passage at water table elevation in the Painted Cave karst tower where several large caves are also known. The semi-flooded passage is over 480 m long and traverses the tower from east to west, intersecting other much larger vadose caves. The epiphreatic flow path is characterized by a number of sinking streams and resurgences as well as several sharp bends in the passage indicating joint control. As an initial attempt this study was undertaken to correlate the water chemistry along the cave path to understand the geomorphological controls. A preliminary campaign of water sampling was carried out with samples collected at ten locations along the path of the cave stream and analyzed for pH, EC, TDS, DO, Eh, major ions, nutrients and trace metals. The results show that dissolution of host rock and leaching of organic matter are the dominant controlling factors for the geochemistry of surface water along the cave stream passage. During dry conditions the water was under-saturated for carbonate minerals but...

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Significance of pCO2 values in determining carbonate chemistry in groundwater of Pondicherry region, India

Cited by 41 publications

References 19 publications

A study on groundwater geochemistry and water quality in layered aquifers system of Pondicherry region, southeast India

A study on groundwater geochemistry and water quality in layered aquifers system of Pondicherry region, southeast India

Lithological and hydrochemical controls on distribution and speciation of uranium in groundwaters of hard-rock granitic aquifers of Madurai District, Tamil Nadu (India)

Epiphreatic caves in Niah karst tower (NW Borneo): occurrence, morphology and hydrogeochemistry

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