Abstract
The Henry’s Law constant (k) for phosphine in seawater was determined by multiple phase equilibration combined with headspace gas chromatography. The effects of pH, temperature, and salinity on k were studied. The k value for phosphine in natural seawater was 6.415 at room temperature (approximately 23°C). This value increases with increases in temperature and salinity, but no obvious change was observed at different pH levels. At the same temperature, there was no significant difference between the k for phosphine in natural seawater and that in artificial seawater. This implies that temperature and salinity are major determining factors for k in marine environment. Double linear regression with Henry’s Law constants for phosphine as a function of temperature and salinity confirmed our observations. These results provide a basis for the measurement of trace phosphine concentrations in seawater, and will be helpful for future research on the status of phosphine in the oceanic biogeochemical cycle of phosphorus.
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Supported by the National Natural Science Foundation of China (Nos. 30970522, 40576058) and the National Natural Science Foundation of China for Creative Research Groups (No. 41121064)
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Fu, M., Yu, Z., Lu, G. et al. Henry’s law constant for phosphine in seawater: determination and assessment of influencing factors. Chin. J. Ocean. Limnol. 31, 860–866 (2013). https://doi.org/10.1007/s00343-013-2212-1
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DOI: https://doi.org/10.1007/s00343-013-2212-1