Temporal Variations in Water Chemistry of the (Lower) Brahmaputra River: Implications to Seasonality in Mineral Weathering

2019 ◽  
Vol 20 (6) ◽  
pp. 2769-2785 ◽  
Author(s):  
Anupam Samanta ◽  
Gyana Ranjan Tripathy ◽  
Ritima Das
Keyword(s):  
Water Chemistry ◽  
Temporal Variations ◽  
Mineral Weathering ◽  
Brahmaputra River

Influence of temporal variations in water chemistry on the Pb isotopic composition of rainbow trout (Oncorhynchus mykiss)

2005 ◽  
Vol 350 (1-3) ◽  
pp. 204-224 ◽  
Author(s):  
Jerry R. Miller ◽  
Jamie B. Anderson ◽  
Paul J. Lechler ◽  
Shannon L. Kondrad ◽  
Peter F. Galbreath ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Isotopic Composition ◽  
Water Chemistry ◽  
Temporal Variations ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Pb Isotopic Composition

Did elevated atmospheric CO2alter soil mineral weathering?: an analysis of 5-year soil water chemistry data at Duke FACE study

2007 ◽  
Vol 13 (12) ◽  
pp. 2626-2641 ◽  
Author(s):  
NEUNG-HWAN OH ◽  
MICHAEL HOFMOCKEL ◽  
MICHAEL L. LAVINE ◽  
DANIEL D. RICHTER
Keyword(s):  
Water Chemistry ◽  
Soil Water ◽  
Mineral Weathering ◽  
Soil Mineral ◽  
Chemistry Data ◽  
Soil Water Chemistry

scholarly journals Monitoring Metallothionein-Like Protein Concentrations And Cholinesterase Activity In Tropical Cup Oysters As Biomarkers of Exposure To Metals And Pesticides In The Southern Caribbean, Colombia

2021 ◽  
Author(s):  
Angela M. Moncaleano-Niño ◽  
Maria Camila Gómez-Cubillos ◽  
Andrea Luna-Acosta ◽  
Luisa Villamil ◽  
Samuel Casseres-Ruiz ◽  
...  
Keyword(s):  
Dissolved Oxygen ◽  
Water Chemistry ◽  
Digestive Gland ◽  
Cholinesterase Activity ◽  
Temporal Variations ◽  
Chemical Parameters ◽  
Metal Concentrations ◽  
Biomarkers Of Exposure ◽  
Physical Chemical ◽  
Southern Caribbean

Abstract Metallothionein-like protein concentrations (MT) and three functionally defined fractions of cholinesterase activity (ChE: total, eserine-sensitive, eserine-resistant) were quantified in gill and digestive gland homogenates of tropical cup oysters from 5 nearshore locations in the Colombian Caribbean and correlated with sediment and tissue metal (9 metals) and pesticide (22 organophosphates, OPs, and 20 organochlorines- OCPs), as well as water physical-chemical parameters (salinity, pH, temperature and dissolved oxygen). Tissue and sediment pesticide concentrations were below detection limits in all samples, whereas sediment and tissue metal concentrations exceeded environmental thresholds at several locations. Tissue MT and ChE biomarkers varied by a factor of 5-6 between locations and correlated with tissue and sediment concentrations. However, statistically significant covariance between biomarkers and water chemistry parameters was also observed, indicating that both, metal concentrations and physical-chemical variables, are likely to be responsible for generating the observed spatial-temporal variations in biomarker patterns.

Estimating calcium weathering rates and future lake calcium concentrations in the Muskoka–Haliburton region of Ontario

2008 ◽  
Vol 65 (5) ◽  
pp. 821-833 ◽  
Author(s):  
Shaun A Watmough ◽  
Julian Aherne
Keyword(s):  
Steady State ◽  
Water Chemistry ◽  
Timber Harvesting ◽  
Mineral Weathering ◽  
Drainage Basins ◽  
Weathering Rates ◽  
South Central ◽  
Model Predictions ◽  
State Water ◽  
Hydrochemical Model

Calcium (Ca) concentrations in surface waters on the Precambrian Shield are determined primarily by the Ca weathering rate in soil, which requires extensive soil data that generally do not exist. From a water chemistry database comprising approximately 550 lakes in south-central Ontario, Canada, 130 lakes were selected with low Ca concentrations (Ca < 75 µmol·L–1). Calcium weathering is primarily dominated by silicate minerals such as plagioclase and hornblende, allowing the use of Ca–sodium (Na) ratios in lake water to estimate Ca weathering rates. Soil profile data at seven sites indicated that the Ca–Na ratio from mineral weathering is 0.86; correspondingly, Ca weathering rates in lakes ranged from 0.04 to 0.24 kmol·ha–1·year–1 (median of 0.09 kmol·ha–1·year–1). This compares with a range of 0.06–0.24 kmol·ha–1·year–1 (median of 0.14 kmol·ha–1·year–1) obtained using the steady-state water chemistry model. Using these methods to bound potential weathering rates, Ca concentrations in individual lakes at steady state are predicted to decline by 10%–40% compared with current values. Dynamic soil hydrochemical model predictions indicate that Ca concentrations in lakes will be considerably lower than these steady-state predictions within decades if timber harvesting occurs in the drainage basins.

scholarly journals Groundwater geochemistry of the Mt. Vesuvius area: implications for volcano surveillance and relationship with hydrological and seismic signals

2013 ◽  
Vol 56 (4) ◽  
Author(s):  
Cinzia Federico ◽  
Paolo Madonia ◽  
Paola Cusano ◽  
Simona Petrosino
Keyword(s):  
Stress Field ◽  
Water Chemistry ◽  
Saline Water ◽  
Fluid Pressure ◽  
Temporal Variations ◽  
Gas Content ◽  
Geochemical Data ◽  
Data Set ◽  
Dissolved Carbon ◽  
Geochemical Parameters

<p>Geochemical data obtained between 1998 and 2011 at the Mt. Vesuvius aquifer are discussed, focusing on the effects of both the hydrological regime and the temporal pattern of local seismicity. Water samples were collected in a permanent network of wells and springs located in the areas that are mostly affected by the ascent of magmatic volatiles, and their chemical composition and dissolved gas content were analyzed. As well as the geochemical parameters that describe the behavior of groundwater at Mt. Vesuvius, we discuss the temporal distribution of volcano-tectonic earthquakes. The seismological data set was collected by the stations forming the permanent and mobile network of the Istituto Nazionale di Geofisica e Vulcanologia - Osservatorio Vesuviano (INGV-OV). Our analysis of seismic data collected during 1998-2011 identified statistically significant variations in the seismicity rate, marked by phases of decreasing activity from October 1999 to May 2001 and increasing activity from August 2004 to mid-2006. The water chemistry shows peculiar patterns, characterized by a changeable input of CO<span><sub>2</sub></span>-rich and saline water, which must be related to either a changing stress field or an increased input of CO<span><sub>2</sub></span>-rich vapor. The water chemistry data from 1999 to 2003 account for both higher fluid pressure (which induced the seismic crisis of 1999 that peaked with a 3.6-magnitude earthquake in October 1999) and the increased input of CO<span><sub>2</sub></span>-rich fluids. The highest emission of CO<span><sub>2</sub></span> from the crater fumaroles and the corresponding increase in dissolved carbon in groundwater characterize the phase of low seismicity. The termination of the phase of intense deep degassing is associated with a change in water chemistry and a peculiar seismic event that was recorded in July 2003. All these seismic and geochemical patterns are interpreted according to temporal variations in the regional and local stress field.</p>

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