Citation:

s12665-009-0315-y

Name: (Table 1) Concentration and geological parameters of n-alkanes and n-alkenes in surface sediments from the Gulf of Gabes, Tunisia
Published: 2010
License: https://creativecommons.org/licenses/by/3.0/

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Abstract:

Abstract Hydrocarbons in surface sediments were studied quantitatively and qualitatively in 18 stations along the coastline of Gabes Gulf in Tunisia. The results show that the total hydrocarbon levels vary along a wide range from 90 to 1,800 ppm. The GC-MS profiles of aliphatic hydrocarbons vary according to the stations and show that the hydrocarbons were derived from various sources. A special feature prevalent in several stations was identified: aliphatic hydrocarbons with distinctive chemical features. This includes a high abundance of even-numbered n-alkanes (n-C14 - n-C26, maximizing at n-C18, n-C20 and n-C22) and n-alk-1-enes (n-C14:1 - n-C24:1, maximizing at n-C16:1, n-C18:1, n-C20:1 and n-C22:1). This unusual predominance of even-numbered n-alkanes/alkenes is reported for the first time in the Gulf of Gabes and it thus contributes to the information on the rare occurrence of such distributions in the geosphere.

Coverage:

Median Latitude: 34.434117 * Median Longitude: 10.472011 * South-bound Latitude: 34.088400 * West-bound Longitude: 10.067100 * North-bound Latitude: 34.864400 * East-bound Longitude: 10.965900

Date/Time Start: 2008-01-01T00:00:00 * Date/Time End: 2008-01-01T00:00:00

Minimum DEPTH, sediment/rock: 0 m * Maximum DEPTH, sediment/rock: 0 m

Event(s):

Gabes_S * Latitude: 34.000000 * Longitude: 10.000000 * Date/Time: 2008-01-01T00:00:00 * Elevation: -999.0 m

Comment:

Samples taken from surficial sediments between 0 and 5 cm depth.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Sample code/label	Sample label		Aloulou, Fatma
2	DEPTH, sediment/rock	Depth sed	m			Geocode
3	LATITUDE	Latitude				Geocode
4	LONGITUDE	Longitude				Geocode
5	Hydrocarbons	HC	µg/g	Aloulou, Fatma	Gravimetric analysis
6	n-Alkane, detected carbon number range	n-Alkane range		Aloulou, Fatma	Gas chromatography - Mass spectrometry (GC-MS)
7	n-Alkane, carbon maximum number	Cmax n-alkane		Aloulou, Fatma	Gas chromatography - Mass spectrometry (GC-MS)
8	n-Alkane	n-Alkane	%	Aloulou, Fatma	Gas chromatography - Mass spectrometry (GC-MS)	n-Alkanes < C21 = sum of nC14-nC20 / total n-alkanes
9	Pristane/Phytane ratio	Pr/Phy		Aloulou, Fatma	Gas chromatography - Mass spectrometry (GC-MS)
10	Unresolved complex mixture	UCM	%	Aloulou, Fatma	Gas chromatography - Mass spectrometry (GC-MS)
11	Carbon Preference Index, n-Alkanes	CPI n-Alkanes		Aloulou, Fatma	Gas chromatography - Mass spectrometry (GC-MS)	CPI = (sum of nC17 + nC19+...+ nC27) / (sum of nC16 + nC18 +...+ nC26)
12	Alkenes	Alkenes	%	Aloulou, Fatma	Gas chromatography - Mass spectrometry (GC-MS)
13	Alkene, carbon maximum number	Cmax alkene		Aloulou, Fatma	Gas chromatography - Mass spectrometry (GC-MS)

License:

Creative Commons Attribution 3.0 Unported (CC-BY-3.0)

Size:

159 data points

Data

Download dataset as tab-delimited text — use the following character encoding:

1 Sample label	3 Latitude	4 Longitude	5 HC [µg/g]	6 n-Alkane range	7 Cmax n-alkane	8 n-Alkane [%]	9 Pr/Phy	10 UCM [%]	11 CPI n-Alkanes	12 Alkenes [%]	13 Cmax alkene
S1	34.8644	10.9659	370	15-25	C17	58	0.75	70	1.12	0
S2	34.7888	10.8972	712	14-22	C18	77	0.82	29	0.42	26	C18:1
S3	34.7617	10.8474	120	16-26	C18	66	0.40	21	0.56	37	C20:1
S4	34.6576	10.7699	1800	16-26	C20 C21 C22	36	0.31	30	0.98	0
S5	34.6253	10.8400	1167	14-16	C16	85		31		23	C18:1 C20:1
S6	34.5843	10.6582	320	16-24	C18 C20 C22	59		26	0.60	6	C18:1
S7	34.4879	10.5040	600	16-28	C18	62	0.51	44	0.57	0
S8	34.4462	10.5615	830	14-16	C16	83		23		92	C18:1 C20:1
S9	34.4058	10.4047	250	18-26	C22	33		16	1.09	24	C20:1
S10	34.3609	10.4534	575	14-16	C16	70		38		90	C20:1
S11	34.3238	10.3464	110	16-24	C18	51	0.41	66	0.85	19	C18:1 C18:3
S12	34.2978	10.4021	1237	14-18	C18	89		35		91	C18:1 C20:1
S13	34.3040	10.1782	190	17-26	C22	23		19	0.67	0
S14	34.2472	10.2160	796	14-16	C16	86		26		92	C18:1 C20:1
S15	34.2364	10.1052	370	16-28	C22	19		20	0.80	20	C20:1 C24:1
S16	34.2083	10.1564	765	16-14	C16	92		22		91	C20:1 C22:1
S17	34.1253	10.0671	90	16-25	C20	58	0.31	21	0.31	30	C20:1
S18	34.0884	10.1226	332	16-27	C24	20		29	1.29	34	C22:1 C24:1