Citation:

PANGAEA.931132 (unpublished dataset)

Name: Compound identification and molecular abundance distribution of long-chain n-alkanes from a peat sequence in the middle Yangtze river catchment, southeast China
Keywords: d13C; dD; leaf-wax n-alkane

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Abstract:

The samples from our peat core were collected using a manual sampling drill and PVC tubes with a diameter of 0.60m. The sampling site is located at Xiyaohu(XYH) peatland (28.44°N, 115.40°E, elevation: 735m). The penetration length is 3.35m, and the total length of the core is 3.00m.

From 2016-9 to 2016-11, the core was subsampled at 5- and 4-cm intervals through the top and bottom 0.15m, respectively .The leaf-wax n-alkanes were freeze-dried and homogenized. Sediments were solvent-extracted with 9:1 v/ v dichloromethane (DCM) to methanol (MeOH) at 30 °C for 30 min and 1500 psi for 5 min using an accelerated solvent extraction system. Total lipid extracts were separated using column chromatography through silica gels into the hexane and neutral fractions, using hexane and 9:1 v/v DCM: MeOH, respectively. The hexane and neutral fractions contain n-alkanes and the remaining parts of the lipid, such as long-chain ketene, respectively.

From 2017-2 to 2017-4, compound identification and the molecular abundance distribution of long-chain n-alkanes were detected by gas chromatography (GC, Agilent 7890B) equipped with a flame ionization detector (FID) for separation and quantification. The FID temperature was 310 °C, the H2 speed was 30 mL/min, the airflow speed was 400 ml/min, and each sample tested was 1 µL. Individual n-alkane identification was performed by comparing the retention times of n-alkanes in samples with the aforementioned standards.

Keyword(s):

d13C; dD; leaf-wax n-alkane

Coverage:

Latitude: 28.440000 * Longitude: 115.400000

Date/Time Start: 2015-04-01T00:00:00 * Date/Time End: 2015-04-01T00:00:00

Minimum DEPTH, sediment/rock: 0.020 m * Maximum DEPTH, sediment/rock: 2.990 m

Event(s):

XYH_peatland * Latitude: 28.440000 * Longitude: 115.400000 * Date/Time: 2015-04-01T00:00:00 * Elevation: 735.0 m * Location: Xiyaohu, China * Method/Device: Hand drill (HDRILL) * Comment: Core length: 3 meter

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Depth, top/min	Depth top	m	Ma, Chunmei
2	Depth, bottom/max	Depth bot	m	Ma, Chunmei
3	DEPTH, sediment/rock	Depth sed	m	Ma, Chunmei		Geocode – Mean depth
4	Age	Age	a AD/CE	Ma, Chunmei
5	n-Alkane C17 of total alkanes	C17	%	Ma, Chunmei	Gas chromatography, Agilent 7820B, equipped with a flame ionization detector (FID)
6	n-Alkane C18 of total alkanes	C18	%	Ma, Chunmei	Gas chromatography, Agilent 7820B, equipped with a flame ionization detector (FID)
7	n-Alkane C23 of total alkanes	C23	%	Ma, Chunmei	Gas chromatography, Agilent 7820B, equipped with a flame ionization detector (FID)
8	n-Alkane C25 of total alkanes	C25	%	Ma, Chunmei	Gas chromatography, Agilent 7820B, equipped with a flame ionization detector (FID)
9	n-Alkane C27 of total alkanes	C27	%	Ma, Chunmei	Gas chromatography, Agilent 7820B, equipped with a flame ionization detector (FID)
10	n-Alkane C29 of total alkanes	C29	%	Ma, Chunmei	Gas chromatography, Agilent 7820B, equipped with a flame ionization detector (FID)
11	n-Alkane C31 of total alkanes	C31	%	Ma, Chunmei	Gas chromatography, Agilent 7820B, equipped with a flame ionization detector (FID)
12	Average chain length	ACL		Ma, Chunmei
13	Aquatic portion	Paq		Ma, Chunmei
14	Carbon Preference Index	CPI		Ma, Chunmei
15	n-Alkane, C23/C31 ratio	C23/C31		Ma, Chunmei	Gas chromatography, Agilent 7820B, equipped with a flame ionization detector (FID)
16	n-Alkane C17, per unit sediment mass	C17/sed	µg/g	Ma, Chunmei	Gas chromatography, Agilent 7820B, equipped with a flame ionization detector (FID)
17	n-Alkane C18, per unit sediment mass	C18/sed	µg/g	Ma, Chunmei	Gas chromatography, Agilent 7820B, equipped with a flame ionization detector (FID)
18	n-Alkane C19, per unit sediment mass	C19/sed	µg/g	Ma, Chunmei	Gas chromatography, Agilent 7820B, equipped with a flame ionization detector (FID)
19	n-Alkane C20, per unit sediment mass	C20/sed	µg/g	Ma, Chunmei	Gas chromatography, Agilent 7820B, equipped with a flame ionization detector (FID)
20	n-Alkane C21, per unit sediment mass	C21/sed	µg/g	Ma, Chunmei	Gas chromatography, Agilent 7820B, equipped with a flame ionization detector (FID)
21	n-Alkane C22, per unit sediment mass	C22/sed	µg/g	Ma, Chunmei	Gas chromatography, Agilent 7820B, equipped with a flame ionization detector (FID)
22	n-Alkane C23, per unit sediment mass	C23/sed	µg/g	Ma, Chunmei	Gas chromatography, Agilent 7820B, equipped with a flame ionization detector (FID)
23	n-Alkane C24, per unit sediment mass	C24/sed	µg/g	Ma, Chunmei	Gas chromatography, Agilent 7820B, equipped with a flame ionization detector (FID)
24	n-Alkane C25, per unit sediment mass	C25/sed	µg/g	Ma, Chunmei	Gas chromatography, Agilent 7820B, equipped with a flame ionization detector (FID)
25	n-Alkane C26, per unit sediment mass	C26/sed	µg/g	Ma, Chunmei	Gas chromatography, Agilent 7820B, equipped with a flame ionization detector (FID)
26	n-Alkane C27, per unit sediment mass	C27/sed	µg/g	Ma, Chunmei	Gas chromatography, Agilent 7820B, equipped with a flame ionization detector (FID)
27	n-Alkane C28, per unit sediment mass	C28/sed	µg/g	Ma, Chunmei	Gas chromatography, Agilent 7820B, equipped with a flame ionization detector (FID)
28	n-Alkane C29, per unit sediment mass	C29/sed	µg/g	Ma, Chunmei	Gas chromatography, Agilent 7820B, equipped with a flame ionization detector (FID)
29	n-Alkane C30, per unit sediment mass	C30/sed	µg/g	Ma, Chunmei	Gas chromatography, Agilent 7820B, equipped with a flame ionization detector (FID)
30	n-Alkane C31, per unit sediment mass	C31/sed	µg/g	Ma, Chunmei	Gas chromatography, Agilent 7820B, equipped with a flame ionization detector (FID)
31	n-Alkane C32, per unit sediment mass	C32/sed	µg/g	Ma, Chunmei	Gas chromatography, Agilent 7820B, equipped with a flame ionization detector (FID)
32	n-Alkane C33, per unit sediment mass	C33/sed	µg/g	Ma, Chunmei	Gas chromatography, Agilent 7820B, equipped with a flame ionization detector (FID)
33	n-Alkane C34, per unit sediment mass	C34/sed	µg/g	Ma, Chunmei	Gas chromatography, Agilent 7820B, equipped with a flame ionization detector (FID)
34	n-Alkane C35, per unit sediment mass	C35/sed	µg/g	Ma, Chunmei	Gas chromatography, Agilent 7820B, equipped with a flame ionization detector (FID)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

2205 data points

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