Citation:

PANGAEA.945665

Name: Sequential extraction of P components (SEDEX) in sediment core M157_14-17, 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: -22.999817 * Longitude: 14.050183

Date/Time Start: 2019-08-28T15:25:00 * Date/Time End: 2019-08-28T15:25:00

Minimum DEPTH, sediment/rock: 0.005 m * Maximum DEPTH, sediment/rock: 0.320 m

Event(s):

M157_14-17 * Latitude: -22.999817 * Longitude: 14.050183 * Date/Time: 2019-08-28T15:25:00 * Elevation: -139.0 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	1480	70	60	80	330	2010
0.035	1730	80	30	90	350	2280
0.045	1680	100	40	70	360	2250
0.055	1630	80	50	90	390	2240
0.065	1660	90	30	80	360	2220
0.075	1580	80	20	80	350	2120
0.090	1620	90	30	80	380	2190
0.110	1700	80	30	70	380	2260
0.200	970	60	50	70	330	1480
0.320	520	50	50	50	330	990