Citation:

PANGAEA.945664

Name: Sequential extraction of P components (SEDEX) in sediment core M157_12-17, off Namibia
Creator: Matthias Zabel
Published: 2022-06-27
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Benguela Upwelling System; Phosphorus fractions

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Abstract:

A 5-step sequential extraction scheme modified after Ruttenberg (1992), Schenau and De Lange (2000) and Küster-Heins et al., (2010) was used for the speciation of particulate P. Approximately 125mg freeze-dried sediment sample was successively washed with 25 ml of (1) 2 M NH4Cl (pH 7; 4 h; repeat 8 to 10 times), (2) CDB (citrate-dithionite-bicarbonate) buffer solution (pH 7.5; 8 h), (3) 1M sodium acetate buffer solution (pH 4; 6 h), (4) 1 M HCl (24 h) and (5) 1 M HCl (24 h) after ignition for 3 hours at 550 °C. The extracted P components include biogenic P in fish scales, bones and teeth that are mainly composed of hydroxyapatite (PHydap) from step 1, iron-bound P (PFe) from step 2, authigenic apatite (PAuthigenic) from step 3 typically corresponding to carbonate fluorapatite, detrital P (PDetrital) from step 4 and organic P (Porg) from step 5. The sum of these fractions gives the total P content (Ptotal). The P concentration of the solutions was determined by inductively coupled plasma optical emission spectrometry (ICP-OES) with a precision of < 5 %.

Keyword(s):

Benguela Upwelling System; Phosphorus fractions

Supplement to:

Chuang, Pei-Chuan; Anderson, Chloe H; Kossack, Michael; Fabian, Jenny; Su, Chih-Chieh; Vosteen, Paul; Zabel, Matthias; Scholz, Florian; Schulz-Vogt, Heide N; Sommer, Stefan; Dale, Andrew W (2022): Nutrient turnover by large sulfur bacteria on the Namibian mud belt during the low productivity season. Frontiers in Marine Science, 9, 929913, https://doi.org/10.3389/fmars.2022.929913

Project(s):

Center for Marine Environmental Sciences (MARUM)

The Benguela Upwelling System under climate change – Effects of VARiability in physical forcing on carbon and oxygen budgets (EVAR)

Coverage:

Latitude: -23.000583 * Longitude: 13.868717

Date/Time Start: 2019-08-23T11:26:00 * Date/Time End: 2019-08-23T11:26:00

Minimum DEPTH, sediment/rock: 0.005 m * Maximum DEPTH, sediment/rock: 0.280 m

Event(s):

M157_12-17 * Latitude: -23.000583 * Longitude: 13.868717 * Date/Time: 2019-08-23T11:26:00 * Elevation: -149.0 m * Campaign: (BUSUC 1) * Basis: * Method/Device: MultiCorer (MUC)

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	DEPTH, sediment/rock	Depth sed	m	Zabel, Matthias		Geocode
2	Phosphorus, hydroxyapatite	P hydap	mg/kg	Zabel, Matthias	ICP-OES
3	Phosphorus, iron-bound	P Fe-bound	mg/kg	Zabel, Matthias	ICP-OES
4	Phosphorus, authigenic	P auth	mg/kg	Zabel, Matthias	ICP-OES
5	Phosphorus, detrital	P detr	mg/kg	Zabel, Matthias	ICP-OES
6	Phosphorus, organic	P org	mg/kg	Zabel, Matthias	ICP-OES
7	Phosphorus, total	TP	mg/kg	Zabel, Matthias	Calculated

License:

Creative Commons Attribution 4.0 International (CC-BY-4.0)

Status:

Curation Level: Enhanced curation (CurationLevelC)

Size:

60 data points

Data

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

1 Depth sed [m]	2 P hydap [mg/kg]	3 P Fe-bound [mg/kg]	4 P auth [mg/kg]	5 P detr [mg/kg]	6 P org [mg/kg]	7 TP [mg/kg]
0.005	3060	90	50	90	520	3810
0.015	3180	100	50	100	520	3950
0.025	3260	100	70	90	550	4070
0.035	3080	90	50	100	560	3880
0.045	2920	90	50	90	580	3730
0.055	2800	80	50	120	570	3620
0.070	2500	80	40	90	550	3260
0.110	2490	90	40	100	570	3290
0.160	1410	80	50	50	490	2080
0.280	1360	50	40	80	440	1970