Light Hydrocarbons for Petroleum and Gas Prospecting
V.T. Jones, III, M.D. Matthews and D.M. Richers
Geochemical Remote Sensing of the Subsurface.  Edited by M.Hale
Handbook of Exploration Geochemistry, Vol. 7 (G.J.S. Govett, Editor)
©1999 Elsevier Science B.V. All rights reserved
Preprint

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TABLE 5-VI

Concentrations of hydrocarbons adsorbed by different adsorbents

Tube Length	Hydrocarbon concentration (ppm)							Ratio to source*
	Methane	Ethane	Propane	i-butane	n-butane	Pentane	Total
Activated carbon Columbia G
3 in	5	10	21	30	33	35	134	22.3
8 in	11	21	43	59	64	71	269	44.9
12 in	19	36	72	99	108	120	454	75.7
18 in	29	53	109	143	160	178	672	112.0
Molecular sieve 4A
3 in	8	40	52	3	67	73	243	40.5
8 in	12	60	80	5	100	110	367	61.2
12 in	13	67	89	6	110	130	415	69.2
18 in	14	71	93	7	129	152	466	77.7
Molecular sieve 5A-13X
3 in	8	44	62	78	82	97	371	61.9
8 in	12	67	100	120	125	122	546	91.0
12 in	15	81	127	143	149	146	661	110.2
18 in	16	83	129	151	150	153	682	113.7
Silica Gel
3 in	8	4	14	11	13	12	62	10.3
8 in	33	17	60	43	61	50	264	40.4
12 in	61	32	110	81	109	94	487	81.2
18 in	109	65	193	141	190	163	861	143.5

* Total adsorbed hydrocarbon concentration / hydrocarbon concentration in source gas (Karim, 1964)