Trace metals, dissolved organic matter and their association in natural waters
Trace metals, dissolved organic matter and their association in natural waters
The concentration of the trace metals Cu, Zn and Mn from sea water using Chelex-100 resin was examined. This procedure, with flame and nameless AAS, was used for the measurement of dissolved copper in river, estuarine, coastal and ocean waters. Low concentrations of copper. were measured in waters of the euphotic zone off N.W. Africa (0.05 - 0.11 )Jg 1-1) and an increase in concentration with depth was observed; maximum concentrations of ca. 0.7 fag 1-1 were found in near-bottom samples over red clay sediments.Organic fractions of copper, operationally defined by chloroformextractability and availability to Chelex-100 were measured in natural waters. The chloroform-extractable fraction ranged from ca. 45% of the total copper for river waters to ca. 3% for coastal sea water: in ocean waters it generally varied from undetectable to 0.02 pg 1-1, so accounting for 10% or less of the total. The Chelex-unavailable fraction amounted to 25% of the dissolved copper in coastal water samples. The use of XAD-2 resin in the measurement of another operationally defined organic fraction of copper was examined.An auto-analytical method of DOC measurement was modified to reduce the blank and used to determine the DOC of ocean waters and of ultra-filtered samples of river, estuarine, and coastal waters. Ultra-filtration indicated that the molecular weight of dissolved organic matter in the rivers Test and Beaulieu was centred around 10,000. DOC shows essentially conservative behaviour in the Beaulieu Estuary.Gel filtration was examined as a means of indicating the distribution of trace metals amongst molecular weight fractions of organic matter in natural waters.Dissolved iron in the River Beaulieu was shown to be present predominantly ( > 90%) as an organically stabilised colloid, while manganese appears to be truly dissolved though possibly complexed with organic matter.
University of Southampton
1977
Moore, Robert Michael
(1977)
Trace metals, dissolved organic matter and their association in natural waters.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
The concentration of the trace metals Cu, Zn and Mn from sea water using Chelex-100 resin was examined. This procedure, with flame and nameless AAS, was used for the measurement of dissolved copper in river, estuarine, coastal and ocean waters. Low concentrations of copper. were measured in waters of the euphotic zone off N.W. Africa (0.05 - 0.11 )Jg 1-1) and an increase in concentration with depth was observed; maximum concentrations of ca. 0.7 fag 1-1 were found in near-bottom samples over red clay sediments.Organic fractions of copper, operationally defined by chloroformextractability and availability to Chelex-100 were measured in natural waters. The chloroform-extractable fraction ranged from ca. 45% of the total copper for river waters to ca. 3% for coastal sea water: in ocean waters it generally varied from undetectable to 0.02 pg 1-1, so accounting for 10% or less of the total. The Chelex-unavailable fraction amounted to 25% of the dissolved copper in coastal water samples. The use of XAD-2 resin in the measurement of another operationally defined organic fraction of copper was examined.An auto-analytical method of DOC measurement was modified to reduce the blank and used to determine the DOC of ocean waters and of ultra-filtered samples of river, estuarine, and coastal waters. Ultra-filtration indicated that the molecular weight of dissolved organic matter in the rivers Test and Beaulieu was centred around 10,000. DOC shows essentially conservative behaviour in the Beaulieu Estuary.Gel filtration was examined as a means of indicating the distribution of trace metals amongst molecular weight fractions of organic matter in natural waters.Dissolved iron in the River Beaulieu was shown to be present predominantly ( > 90%) as an organically stabilised colloid, while manganese appears to be truly dissolved though possibly complexed with organic matter.
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Published date: 1977
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Local EPrints ID: 458666
URI: http://eprints.soton.ac.uk/id/eprint/458666
PURE UUID: edbf766d-a6f4-4243-95b0-2ec20b237a84
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Date deposited: 04 Jul 2022 16:53
Last modified: 04 Jul 2022 16:53
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Author:
Robert Michael Moore
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