English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

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 (<it>S </it>= 35, <it>t </it>= 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 - <it>C </it>where brackets denote species concentrations in solution, A and B are species important at higher (A) and lower (B) solution pH, and <it>C </it>is a constant dependent on salinity, temperature and pressure. In the case of equilibria involving complex oxy-anions (MO<it>x</it>(OH)<it>y</it>) or hydroxy complexes (M(OH)<it>n</it>), <it>C </it>is written as p<it>K</it><it>n </it>= -log <it>K</it><it>n </it>or p<it>K</it><it>n</it>* = -log <it>K</it><it>n</it>* respectively, where <it>K</it><it>n </it>and <it>K</it><it>n</it>* are equilibrium constants. For equilibria involving carbonate complexation, the constant <it>C </it>is written as p<it>Q </it>= -log(<it>K</it>2<it>l</it><it>K</it><it>n </it>[HCO3-]) where <it>K</it>2<it>l </it>is the HCO3 - dissociation constant, <it>K</it><it>n </it>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.</p

Inorganic speciation of dissolved elements in seawater: the influence of pH on concentration ratios