Improvements in Drill-Core Headspace Gas Analysis for Samples from Microbially Active Depths

Table 1

Information on IsoJar™ samples and analytical results of headspace gases.

Sample no.	Amount of core sample (g)	Amount of water (g)	Depth of groundwater	Type of additive	Storage period (days)	CO2 (%)	O2 (%)	N2 (%)	CH4 (%)	δ ^13CCH4(‰ VPDB)	δ ^13CCO2(‰ VPDB)
IJ1	220	350	350 m	None	67	6.5	6.9	83	0.030	−45.4	+13.6
IJ2	369	262	350 m	None	41	8.9	2.8	79	6.7	−35.5	+13.2
IJ3	342	304	350 m	None	79	3.1	11.0	80	2.8	−30.8	+13.2
IJ4	360	269	50 m	None	17	0.63	14.6	80	2.2	−49.3	+5.0
IJ5	239	333	50 m	None	68	2.3	9.4	86	0.014	−51.4	+2.1
IJ6	411	247	50 m	None	42	6.7	0.01	79	12.5	−42.5	+3.5
IJ7	339	277	50 m	None	79	2.5	5.4	80	9.6	−36.8	−1.0
IJ8	338	279	50 m	None	79	0.36	18.1	79	0.45	−22.3	−1.4
IJ9	302	274	350 m	HgCl2	19	3.9	7.9	80	5.8	−57.7	+15.2
IJ10	263	328	350 m	HgCl2	67	5.0	2.4	86	4.8	−40.7	+14.5
IJ11	380	274	350 m	HgCl2	41	4.7	5.1	76	12.3	−48.8	+15.7
IJ12	383	241	350 m	HgCl2	92	1.49	14.1	80	0.88	−26.8	+12.9
IJ13	358	262	50 m	HgCl2	19	2.6	8.1	75	11.9	−55.3	+6.0
IJ14	225	349	50 m	HgCl2	68	0.52	16.8	81	0.059	+4.7	+2.7
IJ15	420	252	50 m	HgCl2	42	4.0	3.6	83	7.5	−45.0	+4.7
IJ16	338	284	50 m	HgCl2	79	0.57	14.2	80	2.0	−38.2	+2.5
IJ17	341	229	350 m	BKC	19	6.2	6.9	82	1.89	−50.3	+14.5
IJ18	264	281	350 m	BKC	67	8.9	2.2	80	5.2	−44.6	+13.5
IJ19	388	253	350 m	BKC	41	7.4	0.02	76	15.5	−48.6	+14.3
IJ20	333	302	350 m	BKC	79	5.0	4.4	79	7.6	−46.2	+14.4
IJ21	320	290	50 m	BKC	19	4.7	1.82	85	5.5	−46.2	+3.7
IJ22	345	256	50 m	BKC	68	3.7	8.2	84	2.3	−26.7	+2.8
IJ23	392	258	50 m	BKC	42	4.4	3.2	80	10.2	−42.7	+4.3
IJ24	368	291	50 m	BKC	79	2.2	4.1	80	10.2	−41.8	+2.2
IJ25	360	266	50 m	BKC	79	2.6	3.0	79	13.4	−43.5	+3.2
IJ26	388	242	350 m	None	5	2.3	14.2	79	3.6	−55.4	+14.5
IJ27	379	272	350 m	None	5	3.0	11.6	78	6.1	−53.8	+14.8
IJ28	333	316	350 m	None	5	2.1	12.7	80	3.5	−55.5	+15.1