Citation:

PANGAEA.946414

Name: Atomic absorption spectrophotometric determination of selected elements in ferromanganese nodules from the Pacific, Atlantic, and Indian Oceans
Published: 2022-07-18
License: https://creativecommons.org/licenses/by/4.0/
Keywords: Geochemistry; manganese micronodule; manganese nodule; ocean; sediment

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Published: 2022-07-18 • DOI registered: 2022-08-17

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Abstract:

Twenty-one samples of deep-sea ferromanganese nodules collected from the Pacific, Atlantic, and Indian oceans were supplied by the Lamont-Doherty Geological Observatory of Columbia University and the Hawaii Institute of Geophysics, University of Hawaii. The air-dried manganese nodules were crushed with the aid of a ceramic mortar and pestle, and sorted according to particle size using a set of U.S. standard mesh sieves. Powdered nodules (100/150 ?m) in particle diameter) were dried overnight at 450°C in a Lindberg furnace, and the weight loss of the sample was measured for H2O concentration determination. Exactly 500 mg of the dehydrated samples were acid-digested in a pressurized Teflon

bomb and the contents were diluted to 100 ml with 0.5 M boric acid solution. Five replicates of each nodule specimen were digested and stored in polyethylene bottle. Four aliquots of the acid-digested sample were pipetted into separate beakers to which aqueous thallium standards were added successively with Eppendorf micropipettes. Each sample solution was adjusted to pH 10.8, and the wash solution was added to the separatory funnel. Five milliliters of a 1% APDC solution and 10 ml of MIBK were pipetted into each separatory funnel. The funnels were mounted on a Kraft Model S-500 mechanical shaker and shaken at a maximum amplitude for 10 min. A Perkin-EImer 603 atomic absorption spectrophotometer equipped with Westinghouse single-element hollow cathode lamps was used together with an air-acetylene oxidizing flame and a 10-cm single slot burner for all the measurements. Thallium was determined in the APDC-MIBK extract as soon as possible after the extraction step was completed, using the primary wavelength (276.8 nm), a 16 mA lamp current, and a slit setting at 4. Other metals such as Mn, Fe, Cu, Ni, and Co were measured directly in a portion of the acid-digested samples without carrying out the solvent extraction preconcentration step.

Keyword(s):

Geochemistry; manganese micronodule; manganese nodule; ocean; sediment

Related to:

Iskowitz, J M; Lee, John Jong-Hae; Zeitlin, Harry; Fernando, Quintus (1982): Determination of thallium in deep-sea ferromanganese nodules. Marine Mining, 3(3/4), 285-295, Iskowitz_Thallium_Marine_Mining.pdf

Source:

Grant, John Bruce; Moore, Carla J; Alameddin, George; Chen, Kuiying; Barton, Mark (1992): The NOAA and MMS Marine Minerals Geochemical Database. National Geophysical Data Center, NOAA, https://doi.org/10.7289/V52Z13FT

Further details:

Warnken, Robin R; Virden, William T; Moore, Carla J (1992): The NOAA and MMS Marine Minerals Bibliography. National Geophysical Data Center, NOAA, https://doi.org/10.7289/V53X84KN

Project(s):

NOAA and MMS Marine Minerals Geochemical Database (NOAA-MMS)

Coverage:

Median Latitude: -0.844956 * Median Longitude: -140.172297 * South-bound Latitude: -54.500000 * West-bound Longitude: 44.766600 * North-bound Latitude: 45.971670 * East-bound Longitude: -7.188000

Date/Time Start: 1959-11-27T00:00:00 * Date/Time End: 1977-06-29T00:00:00

Minimum DEPTH, sediment/rock: 0.00 m * Maximum DEPTH, sediment/rock: 5.91 m

Event(s):

CRU9121 * Latitude: 19.816660 * Longitude: -121.733330 * Elevation: -4320.0 m * Location: Pacific Ocean * Method/Device: Dredge (DRG)

HM-1178 * Latitude: 12.000000 * Longitude: -178.000000 * Elevation: -5200.0 m * Location: Pacific Ocean

KK72MW-RD20 * Latitude: 28.816700 * Longitude: -178.950000 * Date/Time: 1972-07-24T00:00:00 * Elevation: -980.0 m * Location: Pacific Ocean * Campaign: * Basis: Kana Keoki * Method/Device: Dredge, rock (DRG_R)

Comment:

From 1983 until 1989 NOAA-NCEI compiled the NOAA-MMS Marine Minerals Geochemical Database from journal articles, technical reports and unpublished sources from other institutions. At the time it was the most extended data compilation on ferromanganese deposits world wide. Initially published in a proprietary format incompatible with present day standards it was jointly decided by AWI and NOAA to transcribe this legacy data into PANGAEA. This transfer is augmented by a careful checking of the original sources when available and the encoding of ancillary information (sample description, method of analysis...) not present in the NOAA-MMS database.

This table is digitized from Table 1, pp. 289-290 of the linked publication.

Parameter(s):

#	Name	Short Name	Unit	Principal Investigator	Method/Device	Comment
1	Event label	Event		Iskowitz, J M
2	Latitude of event	Latitude		Iskowitz, J M
3	Longitude of event	Longitude		Iskowitz, J M
4	Elevation of event	Elevation	m	Iskowitz, J M
5	Device type	Device		Iskowitz, J M
6	Identification	ID		Iskowitz, J M
7	DEPTH, sediment/rock	Depth sed	m	Iskowitz, J M		Geocode
8	Thallium	Tl	mg/kg	Iskowitz, J M	Atomic absorption spectrophotometry
9	Manganese	Mn	%	Iskowitz, J M	Atomic absorption spectrophotometry
10	Iron	Fe	%	Iskowitz, J M	Atomic absorption spectrophotometry
11	Copper	Cu	%	Iskowitz, J M	Atomic absorption spectrophotometry
12	Nickel	Ni	%	Iskowitz, J M	Atomic absorption spectrophotometry
13	Cobalt	Co	%	Iskowitz, J M	Atomic absorption spectrophotometry
14	Water in rock	H2O	%	Iskowitz, J M	Calculated from weight loss after drying
15	Deposit type	Deposit type		Iskowitz, J M		Water content was determined by air drying at 450° C for 12 hours