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Table T21. Background control on the hydrocarbon gas content of drilling mud entering Hole C0020A.

Mud tank
sample 		Date
(2012) 		Time (h) Sample
weight (g) 		Concentration in headspace (ppmv)
Methane Ethane Propane iso-Butane n-Butane Propylene Ethylene
337-C0020A-
106-LMT 26 Aug 1235 5.02 4.9 BD BD 3.6 BD BD BD
107-LMT 26 Aug 1235 5.23 5.2 BD BD 3.1 BD BD BD
108-LMT 26 Aug 1236 4.94 4.6 3.6 BD 4.7 BD BD BD
109-LMT 26 Aug 1236 4.90 4.6 3.0 BD 5.4 BD BD BD
159-LMT 27 Aug 0610 5.33 10.0 BD BD 3.0 BD BD BD
165-LMT 28 Aug 0523 5.06 5.7 BD BD 3.6 BD BD BD
167-LMT 31 Aug 0343 5.25 9.8 BD BD 2.9 BD BD BD
185-LMT 31 Aug 0438 4.71 10.8 2.3 BD 4.2 BD BD BD
214-LMT 1 Sep 0551 5.18 90.2 0.2 BD 4.2 BD BD BD
229-LMT 2 Sep 0611 4.94 47.6 BD BD 8.0 11.5 BD 0.3
237-LMT 3 Sep 0408 5.06 55.8 BD BD 2.8 BD BD BD
239-LMT 4 Sep 0557 5.04 12.4 BD BD 4.8 BD BD BD
256-LMT 5 Sep 0603 4.80 60.8 BD BD 5.9 BD BD BD
348-LMT 7 Sep 0450 4.77 31.6 BD BD 5.2 BD BD BD

The composition of hydrocarbon gases was analyzed in samples taken from the drilling mud tank using the headspace technique, ~5 mL of drilling mud and 20 mL headspace vials. LMT = fresh mud water collected at mud tank. BD = below detection. Time was recorded as ship local time (UTC + 8 h).

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