Components:
(1) Dodecane,
C12H26; [112-40-3]
NIST WebBook
(2) Salt mixture (ref 1),
None; [mix-07]
NIST WebBook
(3) Water,
H2O; [7732-18-5]
NIST WebBook
Original Measurements
Button, D. K.; Geochim. Cosmochim. Acta 1976, 40, 435-440.
Variables:
Ambient temperature: 25 °C
Constant salinity - 12 g(2)/kg sln
Prepared by:
Method/Apparatus/Procedure:
Dodecane solutions were prepared in a chemically defined solution resembling dilute seawater. In addition to the mineral salts and vitamins reported (ref 1), the solution contained 1 mg/L arginine and 10 g/L NaCl. After sterilization (121°C for 30 min), 0.8 µL of 14C-dodecane was sprayed on to the medium surface to form a thin film. Gentle subsurface agitation was induced by a 3 in magnet rotating at 60 rev/min against the inside carboy wall at midlevel. The subsurface dodecane concentration was determined from the radioactivity of samples collected from a port at the bottom of the carboy. The system was stirred for 1 week and then allowed to stand. Equilibrium appeared to have been achieved within eight weeks.
Source and Purity of Materials:
- Amersham Searle Corp. (Arlington Heights, I11.) supplied the [1-14C] dodecane, 27 µCi/µmol. It was accompanied by a gas chromatogram of the preparation showing a single peak at the appropriate location.
Estimated Errors:
Ambient temperature: Experimental error is estimated at ±1%.
References
Experimental Values:
Note: Dodecene concentration in saline medium after gently stirring for 1 week and then remaining quiescent for the periods shown.Time, Weeks Dodecene, ug(1)/L(2)
1 2.16 ± 0.03
8 1.80 ± 0.02
16 1.78 ± 0.02
The corresponding mass percent and mole fraction calculated by the compilers for the results at 16 weeks are are 1.74 × 10-7 g(1)/100 g sln and 1.89 × 10-10 using the assumption that the solution density is 1.02 kg/L.
