Stoichiometric distance and total concentration: a binary numerical description of inland water chemistry

1976 ◽  
Vol 27 (1) ◽  
pp. 73
Author(s):  
RT Buckney
Keyword(s):  
Water Chemistry ◽  
Major Ions ◽  
Total Concentration ◽  
Inland Waters ◽  
Ion Chemistry ◽  
Major Ion Chemistry ◽  
Inland Water ◽  
Major Ion ◽  
Silica Concentration

A two-number description of the major ion chemistry of inland waters is derived from data on total concentration and the relative proportions of major ions (stoichiometry), and used to describe some broad features of Tasmanian inland waters. Equilibrium and other controls on pH and silica concentration are identified. Other possible uses of the binary numerical description are discussed.

Major ion chemistry and water quality assessment of groundwater in the Shigaze urban area, Qinghai-Tibetan Plateau, China

2019 ◽  
Vol 20 (1) ◽  
pp. 335-347 ◽  
Author(s):  
Yingzhi Li ◽  
Jiutan Liu ◽  
Zongjun Gao ◽  
Min Wang ◽  
Leqi Yu
Keyword(s):  
Water Quality ◽  
Tibetan Plateau ◽  
Quality Assessment ◽  
Major Ions ◽  
Water Quality Assessment ◽  
Ion Chemistry ◽  
Major Ion Chemistry ◽  
Major Ion ◽  
The Mean ◽  
Over Time

Abstract Shigaze city is situated in the southwestern Tibetan Plateau and is the second largest city in the Tibet Autonomous Region. Groundwater is the major source of domestic and drinking water for urban inhabitants. In this study, the major ion chemistry and a water quality assessment of groundwater were studied using geochemical methods and fuzzy comprehensive assessment. Groundwater was classified as slightly alkaline soft and hard freshwater, and the influence of anthropogenic activities on groundwater was relatively weak. The dominant cations and anions were Ca2+ and Mg2+ and HCO3− and SO42−, respectively. Overall, the mean concentrations of major ions in groundwater increase gradually over time, except for NO3−; however, the mean value of pH decreases over time. Most groundwater samples belong to the type of HCO3-Ca, and the groundwater has a trend of evolution from HCO3-Ca to the mixed type. Rock weathering was the main hydrogeochemical process controlling groundwater hydrochemistry, and the dissolution of carbonate and silicate minerals were the primary contributors to the formation of the major ion chemistry of groundwater. Major ions of groundwater in the urban area of Shigaze are below the standard limits, and the groundwater is excellent for drinking according to the fuzzy comprehensive assessment.

scholarly journals Assessment of Water Quality of a Tropical River with Special Reference to Ions

2020 ◽  
pp. 97-116 ◽  
Author(s):  
R. V. Sheeja ◽  
A. M. Sheela ◽  
S. Jaya ◽  
Sabu Joseph
Keyword(s):  
River Water ◽  
Major Ions ◽  
Anthropogenic Activities ◽  
Anthropogenic Pollution ◽  
Control Measures ◽  
Water Type ◽  
Ion Chemistry ◽  
Major Ion Chemistry ◽  
Tropical River ◽  
Major Ion

The role of ions in a tropical river water (Neyyar, Kerala) was assessed. Rock weathering is the dominating mechanism controlling the major ion chemistry of Neyyar river. The dominance of Cl-HCO3-Na during monsoon indicates that geology plays a major role in controlling water chemistry. The presence of mineral varieties of quartz, feldspars, pyroxene, biotite, etc., in the Pre-Cambrian crystalline namely Khondalite and Charnockites, could be the source of major ions. The major ion chemistry of Neyyar river waters show that Na is the dominant cation with lower proportions of Mg and Ca, with HCO3 and Cl as the dominant anions. It belongs to the HCO3 group with significant amounts of Na and Cacations. The dominance of Cl-HCO3-Ca and Ca-HCO3-Cl during post monsoon and pre monsoon respectively indicates that besides geology, the land drainage and anthropogenic activities also control river water. The change in water type observed during monsoon from Na-Cl-HCO3 to Na-Ca-Cl-HCO3 almost from the middle portion may be attributed to anthropogenic pollution. Hence attention is to be paid to take the control measures to prevent the pollution in this stretch of the river.

scholarly journals Major-Ion Chemistry and Quality of Water in Rivers of Northern West Siberia

Water ◽  
2021 ◽  
Vol 13 (21) ◽  
pp. 3107
Author(s):  
Irina Ivanova ◽  
Oleg Savichev ◽  
Nikolay Trifonov ◽  
Yulia V. Kolubaeva ◽  
Natalia Volkova
Keyword(s):  
Water Chemistry ◽  
Potassium Dichromate ◽  
Winter Season ◽  
West Siberia ◽  
West Siberian Plain ◽  
Ion Chemistry ◽  
Major Ion Chemistry ◽  
River Waters ◽  
Major Ion ◽  
River Catchments

This study reports a synthesis of years-long hydrogeochemical monitoring in northern West Siberia, performed by the Russian Meteorological Service (Rosgidromet) and several academic institutions. Natural factors and intensive human economic activity lead to the disruption of the ecosystems of the northern territories of Western Siberia. The aim of this study is to estimate the background water chemistry parameters in the rivers of northern West Siberia in the beginning of the 21st century. The mean values hydrochemical and geochemical indicators were determined with STATISTICA software, which can be used as background values in assessing the actual and allowable anthropogenic impact on water bodies. We revealed four water chemistry provinces: western Ob Gulf and Ob estuary catchments (I); eastern Ob Gulf and Taz Gulf catchments, except for the Taz River and its tributaries (II); Taz River catchments (III); Yenisei River catchments, right bank (IV). The major-ion chemistry of the sampled river waters records a combination of geological, geomorphological, and hydrological conditions in the four provinces. The features typical of the northern West Siberian Plain are especially prominent in province II, which has the lowest average total of major ions (Σmi), the highest chemical oxygen demand (potassium dichromate COD), and the highest contents of Fe and phosphates. The Σmi value is the highest in province IV. The river waters from four provinces share similarity in quite high organic contents (both potassium dichromate and permanganate COD), as well as high NH4+ and Fe. The long-term average Σmi of the waters is predicted not to change much in the coming one or two decades, though it may decrease slightly in the winter season but increase in the fall and spring time.

RAPID CHANGES IN MAJOR ION CHEMISTRY OF SEAWATER AND THE END-PERMIAN MASS EXTINCTION

2017 ◽  
Author(s):  
Tim K. Lowenstein ◽  
◽  
Javier Garcia Veigas ◽  
Dioni I. Cendón ◽  
Lluís Gibert Beotas
Keyword(s):  
Mass Extinction ◽  
Ion Chemistry ◽  
Major Ion Chemistry ◽  
Major Ion ◽  
Rapid Changes ◽  
Permian Mass Extinction
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