Nitric oxide interference in the determination of dissolved oxygen by the azide-modified Winkler method

Barcelona, Michael J.; Garske, Edward E.

doi:10.1021/ac00257a036

Cited by 4 publications

(4 citation statements)

References 15 publications

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“…There is relatively little information available on the spatial or temporal stability of these redox zones or the actual redox conditions in groundwater systems [Jackson et al, 1985;Edmunds et al, 1984;Davison and Vonhof, 1978]. The present study grew out of observations of surprising oxidant behavior (i.e., detection of NO and H202) in groundwaters [Barcelona and Garske, 1983;Holm et al, 1987] and an interest in the dynamics of redox processes as they may affect the fate of organic or trace metal species and chemical oxidants or microorganisms in aquifer remediation schemes.…”

Section: Introductionmentioning

confidence: 94%

Spatial and temporal gradients in aquifer oxidation‐reduction conditions

Barcelona

Holm

Schock

et al. 1989

Water Resources Research

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The study was undertaken to identify principal oxidizing and reducing chemical species in groundwater with the goal of determining the utility of platinum electrode (Eh) measurements to characterize subsurface redox conditions. Serial measurements of Eh and groundwater analyses were conducted in oxic and suboxic environments over more than a 2-year period for major ionic, oxidized, and reduced species. Vertical gradients in measured Eh values in the oxic groundwater environments can exceed -40 mV/m depth. In the poorly poised, oxic groundwaters, the Eh measurements correlated reasonably well with calculated values based on analytical determinations of 02 and H202 which was detected persistently in the 10 -8 to 10 -9 M range. The equilibrium calculated Eh values from this and other redox couples did not correlate well with measured Eh values over the 2-year study period. In the suboxic range, the average calculated values based on the Fe3+/Fe 2+ coupled correlated well with averaged measured values. The results support the need to determine redox pairs in groundwater as a supplement to either calculated "equilibrium" Eh values or Pt electrode Eh measurements.

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Section: Introductionmentioning

confidence: 94%

Spatial and temporal gradients in aquifer oxidation‐reduction conditions

Barcelona

Holm

Schock

et al. 1989

Water Resources Research

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“…A number of investigators have demonstrated that the predicted thermodynamic sequence of electron acceptors (i.e., 02, N03~, Mn(IV), Fe(HI), and S042~") may be evidenced by redox zonation within groundwater flow systems (6)(7)(8). However, the interpretive power of either redox potential measurements or calculated equilibrium potentials alone is only qualitative in many situations (9)(10)(11)(12).…”

Section: Fluorometric Determination Of Hydrogen Peroxide In Groundwatermentioning

confidence: 99%

“…EXPERIMENTAL SECTION Site Description. The groundwater samples which were collected for chemical analysis were taken from PTFE cells (5 cm o.d., Fluorocarbon Co., Anaheim, CA) finished at depths of 11,15,21, and 32 m between November 1984 and January 1986. The wells were constructed by hollow-stem auger techniques without the use of drilling aids or foreign additives.…”

Section: Fluorometric Determination Of Hydrogen Peroxide In Groundwatermentioning

confidence: 99%

Fluorometric determination of hydrogen peroxide in groundwater

Holm¹,

George²,

Barcelona³

1987

Anal. Chem.

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“…The coincidence of high nitrite and dissolved oxygen levels is a contradiction of known redox stability. This may be attributed to a positive interference on the Winkler oxygen determination caused by nitric oxide (13). Nitric oxide is an intermediate in the microbial transformation of inorganic nitrogen species which normally accumulates in closed systems at low pH (14).…”

Section: Resultsmentioning

confidence: 99%