. 2017 Jan 25;8:40. doi: 10.3389/fmicb.2017.00040

Table 1.

Geochemical data for microcosms over the 20-day study.

Variable	Live										Killed
	Day 0		Day 5		Day 11		Day 15		Day 20		Day 0		Day 20
	Average	SD^a	Average	SD	Average	SD	Average	SD	Average	SD	Average	SD	Average	SD
pH	7.9	0.0	8.1	0.2	8.1	0.2	8.1	0.4	NA^b	NA	7.9	0.0	NA
Fe(II) (mM)	8.0	2.4	9.0	0.03	9.8	0.03	9.1	0.01	15.0	2.2	4.5	0.4	NA
Ammonium (μM)	178	1.6	153	12	143	23	154	17	137	3.3	202	6.1	212	18
Chloride (mM)	3.34	0.13	3.27	0.09	3.29	0.12	3.50	0.21	3.29	0.23	3.36	0.12	3.38	0.23
Acetate (μM)	60	4.3	44	13	6.7	2.8	42	22	620^c	35^c	120	26	110	35
Propionate (μM)	<DL^d		< DL		<DL		< DL		<DL		<DL		<DL
Sulfate (mM)	8.67	0.11	8.36	0.46	8.26	0.59	8.66	0.90	8.10	0.86	9.00	0.31	8.75	0.39
Nitrate (μM)	114	5.6	118	12	111	14	98	41	120	25	115	2.5	109	17
Nitrite (μM)	<DL		<DL		<DL		<DL		<DL		<DL		<DL
DOC (μmol)	17.7	14.4	9.1	7.0	5.9	2.2	5.9	3.1	2.5	0.6	69.3	10.5	57.5	7.9
DOC δ¹³C (%0)	−28.54		< DL		<DL		<DL		<DL		−23.82	0.44	−23.56	0.19
Nitrous oxide (ppm)	< DL		< DL		< DL		<DL		<DL		<DL		<DL
Methane (ppm)	1.3	0.0	4.3	0.29	6.4	0.19	7.7	0.76	15.4	0.56	1.3	0.0	1.3	0.0
Hydrogen (ppm)	<DL		<DL		<DL		<DL		<DL		<DL		<DL

Standard deviation.

Not analyzed.

Note that the acetate data on day 20 (live) represents the average of 3 replicates that were attached to the respirometer; a fourth sample, not attached to the respirometer, did not show an increase in acetate. If all replicates were included, acetate would be 470 ± 310 μM.

Below detection limit: propionate, 10 μM; nitrite, 10 μM; DOC δ¹³C, 0.9 μmol C; nitrous oxide, 0.2 ppm; hydrogen, 40 ppm.