SDS Volume (883)
Volume 38. Hydrocarbons in Water and Seawater, Part II, p None
Original Measurements
Button, D. K.; Geochim. Cosmochim. Acta 1976, 40, 435-440.
Variables:
Room Temp:
25
°C
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 [1], the solution contained 1 mg/L arginine and 10 g/L NaCl. After sterilization (121 °C for 30 min), 0.8 µL of $\ce{^{14}C}$-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, Ill.) supplied the [1-$\ce{^{14}C}$] 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
Components:
- Dodecane, $\ce{ C12H26 }$; [112-40-3] NIST WebBook
- Salt mixture [1], $\ce{ NaH2PO4.H2O}$, $\ce{(NH4)SO4}$, $\ce{KCl}$, $\ce{MgSO4}$, $\ce{CaCl2.2H2O}$, $\ce{ZnSO4.7H2O}$, $\ce{Fe(NH4)2(SO4)2.6H2O}$, $\ce{CuSO4.5H2O}$, $\ce{MnSO4.7H2O}$, $\ce{CoSO4.7H2O}$, $\ce{MoO3 }$;
- Water, $\ce{ H2O }$; [7732-18-5] NIST WebBook
Experimental Data
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.
