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- W4248776841 abstract "Assessments of inorganic elemental speciation in seawater span the past four decades. Experimentation, compilation and critical review of equilibrium data over the past forty years have, in particular, considerably improved our understanding of cation hydrolysis and the complexation of cations by carbonate ions in solution. Through experimental investigations and critical evaluation it is now known that more than forty elements have seawater speciation schemes that are strongly influenced by pH. In the present work, the speciation of the elements in seawater is summarized in a manner that highlights the significance of pH variations. For elements that have pH-dependent species concentration ratios, this work summarizes equilibrium data (S = 35, t = 25°C) that can be used to assess regions of dominance and relative species concentrations. Concentration ratios of complex species are expressed in the form log[A]/[B] = pH - C where brackets denote species concentrations in solution, A and B are species important at higher (A) and lower (B) solution pH, and C is a constant dependent on salinity, temperature and pressure. In the case of equilibria involving complex oxy-anions (MO x (OH) y ) or hydroxy complexes (M(OH) n ), C is written as pK n = -log K n or pK n * = -log K n * respectively, where K n and K n * are equilibrium constants. For equilibria involving carbonate complexation, the constant C is written as pQ = -log(K2 l K n [HCO3-]) where K2 l is the HCO3 - dissociation constant, K n is a cation complexation constant and [HCO3-] is approximated as 1.9 × 10-3 molar. Equilibrium data expressed in this manner clearly show dominant species transitions, ranges of dominance, and relative concentrations at any pH." @default.
- W4248776841 created "2022-05-12" @default.
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- W4248776841 date "2002-01-01" @default.
- W4248776841 modified "2023-10-18" @default.
- W4248776841 title "Inorganic speciation of dissolved elements in seawater: the influence of pH on concentration ratios" @default.
- W4248776841 doi "https://doi.org/10.1039/b109732f" @default.
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