MEASUREMENT OF HENRYS LAW CONSTANT AS FUNCTION OF TEMPERATURE AND SALINITY FOR THE LOW-TEMPERATURE RANGE

EPICS technique (Equilibrium Partitioning In Closed Systems) was Furth er developed to study the gas-water equilibrium partitioning (Henry's law) of C-1 and C-2 organochlorines and monocyclic aromatic hydrocarbo ns in the low temperature range. Using this technique Henry's law cons tant was measured for 13 volatile organic compounds (VOCs) at the temp erature range from 2 up to 25 degrees C, and for salt concentrations f rom 0.0 up to 35.0 ppt (parts per thousand, kg m(-3)). The data obtain ed at 25 degrees C, which could be compared, fit well with literature data. A double linear regression was made with Henry's law constant H as a function of the temperature and salinity. This relationship confi rmed theoretical considerations. A comparison between H-values obtaine d for natural sea water and for artificial sea water were in most case s not significantly different, while the few significant differences d id not seem to have a systematic deviation. This implies that for mari ne environments salinity and temperature are the main determining fact ors for Henry's law constants of VOCs and are sufficient to describe t hem.