Identification info

Metadata Language

English (en)

Character set

utf8

Dataset Reference Date ()

2019-11-18

Dataset Reference Date ()

2019-10-24

Identifier

https://catalogue.ceh.ac.uk/id/022b3fff-55d7-46f5-b11f-2f7366e508b0

Identifier

doi: / 10.5285/022b3fff-55d7-46f5-b11f-2f7366e508b0

Other citation details

Franchi, F., Comte, J.C. (2019). Sediment records of the 2016-2017 flood from Notwane dam, Upper Limpopo basin, Botswana. NERC Environmental Information Data Centre 10.5285/022b3fff-55d7-46f5-b11f-2f7366e508b0

GeoNames

• Botswana

Keywords

• Sediment
• Iron
• organic matter
• grain size
• trace metals
• Lead
• Zinc
• Copper
• Chromium
• Notwane Dam

Limitations on Public Access

otherRestrictions

Other constraints

no limitations

Use constraints

otherRestrictions

Other constraints

This resource is available under the terms of the Open Government Licence

Use constraints

otherRestrictions

Other constraints

© Natural Environment Research Council

Use constraints

otherRestrictions

Other constraints

If you reuse this data, you should cite: Franchi, F., Comte, J.C. (2019). Sediment records of the 2016-2017 flood from Notwane dam, Upper Limpopo basin, Botswana. NERC Environmental Information Data Centre https://doi.org/10.5285/022b3fff-55d7-46f5-b11f-2f7366e508b0

Spatial representation type

textTable

Topic category

• Environment
• Inland waters
• Geoscientific information

N

S

E

W

Begin date

2017-11-22

End date

2018-02-19

Code

WGS 84

Distribution Information

Data format

• Comma-separated values (CSV) ()

Quality Scope

dataset

Other

dataset

Statement

Seven cores of sediments were collected at scattered locations in the Notwane dam over 2 days (22/11/2017 and 19/02/2018) for further sedimentological and geochemical analyses. Core collection was realised with 50 mm diameter PVC pipes though use of a push corer equipped with extension rods from shore or from a small boat. They were subsequently stored the same day at 4 ˚C in a refrigerator at the Botswana International University of Science and Technology (BIUST) to allow for water retention. Before analysis, core were split in half, photographed and sub-sampled at selected intervals for lab analysis. Grain size distribution for each interval was obtained through dispersing a few grams of sediment into distilled water which was analysed with a Malvern Mastersizer 3000 laser diffraction particle size analyser at BIUST. The organic matter (OM) content was measured at BIUST through measuring the loss on ignition (LOI) of bulk sediments after calcination in a muffle furnace. The porcelain crucibles were pre-heated in a muffle furnace for 1 hour at 375°C and after cooling transferred into a desiccator for further cooling and weighed. Samples were dried at 105°C for 24 hours and weighed. The dried samples were then heated for 16h at 550°C. 95 samples of sediments from selected intervals of the cores were further analysed for trace metal distribution (Fe, Zn, Cu, Cr and Pb) using an Agilent 4200 Microwave Plasma-Atomic Emission Spectrometer (MP-AES) at BIUST. About 1 g of sample was treated with 10-15 ml of 65% nitric acid at 60°C for a period of 4 hours. The samples were then filtered at <0.45 µm and brought to 50 ml adding Milli-Q distilled water. Average standard deviations were as follows: Fe %RSD = 1.81; Zn %RSD = 4.02; Cu %RSD = 1.43; Cr %RSD = 0.82; Pb %RSD = 1.72. Detection limits for the metals reported here (as weight of dry sediment) were as follows: Cr = 0.8 µg kg-1, Fe = 1.7 µg kg-1; Cu = 0.5 µg kg-1; Zn = 28 µg kg-1; Pb = 2.5 µg kg-1

Metadata

File identifier

022b3fff-55d7-46f5-b11f-2f7366e508b0 XML

Metadata Language

English (en)

Character set

ISO/IEC 8859-1 (also known as Latin 1)

Resource type

dataset

Hierarchy level name

dataset

Metadata Date

2022-05-20T10:40:14

Metadata standard name

UK GEMINI

Metadata standard version

2.3