Automated amperometric oxygen titration

doi:10.1016/0198-0149(87)90042-2

Deep Sea Research Part A. Oceanographic Research Papers

Volume 34, Issues 5–6, May–June 1987, Pages 875-880

https://doi.org/10.1016/0198-0149(87)90042-2 Get rights and content

Abstract

The Winkler method for dissolved oxygen analysis has been automated for routine analysis using a microcomputer controlled piston buret coupled with amperometric end-point detection. The standard deviation of the method under shipboard conditions is 0.3 μM. Analysis time is 3 min per sample.

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Easy interfacing projects for the VIC 20

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South Atlantic interbasin exchanges of mass, heat, salt and anthropogenic carbon
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Citation Excerpt :
DIC and Total Alkalinity were calibrated using Certified Reference Materials (CRM) (and gaseous CO2 loops for DIC along 30°E) to yield measurements with an accuracy of ∼±2–3 μmol kg−1 (Speer and Dittmar, 2008; McDonagh, 2009; King, 2010; Schuster et al., 2013, 2014). Oxygen was measured using Winkler titration (Culberson et al., 1991; Culberson and Huang, 1987), whilst nitrate, phosphate and silicate measurements follow the processes described in Gordon et al. (1993) and Kirkwood (1996). Estimated accuracies according to CARINA methodology are oxygen (1%) and nutrients (2%) (Key et al., 2010).
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2010, Harmful Algae
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Water column dynamics of dissolved inorganic carbon (DIC), nitrogen and O<inf>2</inf> on Georges Bank during April, 1990
1994, Continental Shelf Research
We measured dissolved inorganic carbon (DIC), combined inorganic nitrogen, O₂, chlorophyll a (Chl a), particulate carbon and nitrogen (PCN) along with selected additional parameters on Georges Bank during April. Summer conditions were developing in the region as reflected by elevated biological production at the margins of the Bank (Chl a and O₂ levels > 16mg m⁻³ and> 109% saturated respectively) and nitrate depletion on mid-Bank. Oxygen supersaturations were maintained in the regions of low NO₃ concentration, suggesting that a rapid supply of NO₃ was occurring horizontally from deeper waters. The productive region was propagating into deeper waters as daylight increased but was not yet associated with the tidally mixed front on the western flank. Changes in DIC and O₂ suggested net community production (NCP) of 0.24-0.42 g C m⁻² day⁻¹ on the flank. A collaborative purposeful tracer experiment on mid-Bank permitted a time series of net biological activity to be made and changes in both DIC and O₂ indicated similarly large net respiration was occurring there (NCP = −1.4 g C m⁻² day⁻¹). A budget of particulate carbon and nitrogen suggested the biological character of the mid-Bank seston changed from autotrophy to heterotrophy and most of the remaining suspended particulates were detrital. Thus, the prolonged residence time of shelf water on the Bank contributes to efficient respiration of much of the organic matter formed locally and diminishes the Bank's role as a source of organic matter for off-shelf or down-shelf export. Based on an analysis that accounted for mixing effects between different water masses on the Bank, the ratio of DIC to NO₃ consumption was significantly greater than the Redfield ratio of 6.6. Thus, in such eutrophic regions, estimates of NCP derived from new (nitrate) production may be low by as much as 40%.
Speciation of manganese in Chesapeake Bay waters by voltammetric methods
1994, Analytica Chimica Acta
The Mn(II) to Mn(O) reduction wave (peak) at a mercury electrode was investigated for its analytical usefulness in anoxic Chesapeake Bay waters which contain significant quantities of dissolved and particulate organic matter. The Mn(II) to Mn(O) reduction is characteristic for all Mn(II), MN(III) and MN(IV) complexes and thus represents total dissolved Mn. It does not provide information on only the Mn(II) oxidation state as suggested previously. Inorganic Mn(II) and organic Mn(III) complexes were studied by sampled d.c. polarography, differential pulse polarography, cyclic voltammetry and square wave voltammetry. All methods show that the Mn(II) to Mn(O) reduction is quasi-reversible in sea water. Square wave voltammetry was used for analytical work on field samples. Both Mn(II) and Mn(III) give similar current versus concentration slopes for the Mn(II) to Mn(O) peak when added to Chesapeake Bay samples. The minimum detection limit is near 200 to 300 nM. Comparison of organic free and organic rich laboratory and field samples shows that E_p shifts to more negative potentials for the organic rich samples. Thus, a major finding of this voltammetric study is that manganese can be complexed by organic ligands in marine systems with zones characterized by high organic matter decomposition and low O₂ concentrations. Organic complexation of dissolved Mn may have important consequences for Mn chemistry in marine systems characterized by an oxic / anoxic interface.

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Instruments and methodsAutomated amperometric oxygen titration

Abstract

Journal of Experimental Marine Biology and Ecology

Netherlands Journal of Sea Research

An investigation of errors in the amperometric and starch indicator methods for the titration of millinormal solutions of iodine and thiosulfate

Australian Journal of Scientific Research, Series A

The accuracy of the Winkler method for dissolved oxygen analysis

Limnology and Oceanography

The Chesapeake Bay Institute technique for the Winkler dissolved oxygen method

Limnology and Oceanography

Easy interfacing projects for the VIC 20

Instruments and methods
Automated amperometric oxygen titration