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• W2395437054 abstract "Abstract In seawater dissolved organic acids produced by phytoplankton dissociate into conjugate bases and an amount of hydrogen ions that maintain electroneutrality, leaving the seawater alkalinity ( A T ) unchanged. However, the resulting conjugate bases react with protons during seawater titration and thereby contribute to the titration alkalinity ( A T−ORG ) whereas the contributions of other species (e.g., , ) to A T are proportionally lowered. Production of such dissolved organic acids was confirmed in each of six phytoplankton cultures and in a coastal environment. In phytoplankton monocultures with initial concentrations of ∼70 μM nitrate and ∼5 μM phosphate, the contribution of organic acids to the seawater alkalinity ( A T−ORG ) was found to be 15−40 μ mol kg −1 on the complete consumption of added nutrients, with the magnitude of A T−ORG depending on the phytoplankton species involved. In the coastal environment the contribution of A T−ORG was as high as 15 μ mol kg −1 . Analysis of back titration data of culture and coastal samples further enabled identification of the functional groups responsible, which included two distinct charge groups (p K a1 = 4.4−4.9; p K a2 = 6.1−6.9). Thus, if the effect of organic acids on seawater A T is not accounted for, the concentrations of inorganic carbon components calculated from pairs of carbon parameters, including A T , will be inaccurate in culture studies and in studies of productive coastal environments." @default.
• W2395437054 created "2016-06-24" @default.
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• W2395437054 date "2016-05-27" @default.
• W2395437054 modified "2023-10-06" @default.
• W2395437054 title "Organic alkalinity produced by phytoplankton and its effect on the computation of ocean carbon parameters" @default.
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• W2395437054 doi "https://doi.org/10.1002/lno.10309" @default.
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