The solubility of biphenyl (1) in seawater (2) at 298 K has been reported in two works.

The reported data are all from different salinities, which precludes direct comparison. Since the data appear consistent with each other and with the recommended value for the solubility of biphenyl in pure water, the data of Paul and of Eganhouse and Calder are adopted as tentative.

References:

1 Paul, M. A.; J. Am. Chem. Soc. 1952, 74, 5274-7.
2 Eganhouse, R. P.; Calder, J. A.; Geochim. Cosmochim. Acta 1976, 40, 555-61.