Activity Coefficient of Nitrate Ions in Seawater

Abstract

The coefficients of selectivity of a nitrate-selective electrode to $${\text{C}}{{{\text{l}}}^{ - }}$$, , and $${\text{SO}}_{4}^{{2 - }}$$ ions were experimentally determined: 0.006, 0.0002, and 0.0003, respectively. The value of the activity coefficient of $${\text{NO}}_{{\text{3}}}^{ - }$$ ions in seawater with 35‰ salinity was ascertained: 0.533 ± 0.011 at 25°C.