scholarly journals Refining the use of oxygen consumption as a proxy corrosion rate measure for archaeological and historic iron

2021 ◽  
Vol 136 (5) ◽  
Author(s):  
N. J. Emmerson ◽  
J. H. Seifert ◽  
D. E. Watkinson
Keyword(s):  
Oxygen Consumption ◽  
Corrosion Rate ◽  
Factors Affecting ◽  
Conservation Treatment ◽  
Rate Measure ◽  
Heritage Science ◽  
Instructional Guidance ◽  
Key Aspects ◽  
Oxygen Measurements ◽  
Corrosion Rate Measurement

AbstractSince its introduction to the field of heritage science, oxygen consumption has found multiple applications in the assessment of artefact stability and the examination of conservation treatment efficiencies. Early papers identified various factors affecting oxygen measurements and produced preliminary data on their effects. This paper follows on from the early research by other workers and presents guidance on the application of oxygen consumption as a proxy corrosion rate measurement based on a decade of experience at Cardiff University. It examines the rationale for key aspects of the Cardiff protocols for oxygen consumption and presents data to underpin these. Finally, it provides instructional guidance for heritage scientists adopting oxygen consumption for their research applications.

Some Factors Affecting the Oxygen Consumption of Asellus

1960 ◽  
Vol 37 (4) ◽  
pp. 706-718
Author(s):  
R. W. EDWARDS ◽  
M. A. LEARNER
Keyword(s):  
Oxygen Consumption ◽  
Dissolved Oxygen ◽  
Constant Volume ◽  
Asellus Aquaticus ◽  
Dissolved Oxygen Concentration ◽  
Factors Affecting ◽  
Consumption Rates ◽  
Rate Of Oxygen Consumption ◽  
Wet Weight ◽  
Males And Females

1. The oxygen-consumption rates of Asellus aquaticus (males and females) have been measured at 10 and 20° C. using a constant-volume respirometer, and the effect of starvation for 24 hr. investigated. The oxygen consumption is approximately proportional to the 0.7 power of the wet weight. The rate of oxygen consumption at 20° C. is greater than at 10° C. by a factor of 1.5. 2. The oxygen-consumption rates of A. aquaticus and A. meridianus have been measured at 20° C. in a flowing-water respirometer employing a polarographic technique for the measurement of dissolved-oxygen concentrations. The oxygen consumptions of A. aquaticus and A. meridianus are similar and decrease by 15-20% when the dissolved-oxygen concentration falls from 8.3 to 1.5 p.p.m. 3. The oxygen consumption of A. aquaticus is between 35 and 75% higher in the polarographic respirometer than in the constant-volume respirometer.

Potential step voltammetry: An approach to corrosion rate measurement of reinforcements in concrete

2020 ◽  
Vol 110 ◽  
pp. 103590
Author(s):  
J.E. Ramón ◽  
J.M. Gandía-Romero ◽  
R. Bataller ◽  
M. Alcañiz ◽  
M. Valcuende ◽  
...  
Keyword(s):  
Corrosion Rate ◽  
Rate Measurement ◽  
Potential Step ◽  
Corrosion Rate Measurement

scholarly journals Phosphorescence quenching microrespirometry of skeletal muscle in situ

2011 ◽  
Vol 300 (1) ◽  
pp. H135-H143 ◽  
Author(s):  
Aleksander S. Golub ◽  
Michael A. Tevald ◽  
Roland N. Pittman
Keyword(s):  
Skeletal Muscle ◽  
Oxygen Consumption ◽  
Initial Slope ◽  
Phosphorescence Quenching ◽  
Factors Affecting ◽  
External Sources ◽  
Disappearance Curve ◽  
Residual Blood ◽  
532 Nm

We have developed an optical method for the evaluation of the oxygen consumption (V̇o2) in microscopic volumes of spinotrapezius muscle. Using phosphorescence quenching microscopy (PQM) for the measurement of interstitial Po2, together with rapid pneumatic compression of the organ, we recorded the oxygen disappearance curve (ODC) in the muscle of the anesthetized rats. A 0.6-mm diameter area in the tissue, preloaded with the phosphorescent oxygen probe, was excited once a second by a 532-nm Q-switched laser with pulse duration of 15 ns. Each of the evoked phosphorescence decays was analyzed to obtain a sequence of Po2 values that constituted the ODC. Following flow arrest and tissue compression, the interstitial Po2 decreased rapidly and the initial slope of the ODC was used to calculate the V̇o2. Special analysis of instrumental factors affecting the ODC was performed, and the resulting model was used for evaluation of V̇o2. The calculation was based on the observation of only a small amount of residual blood in the tissue after compression. The contribution of oxygen photoconsumption by PQM and oxygen inflow from external sources was evaluated in specially designed tests. The average oxygen consumption of the rat spinotrapezius muscle was V̇o2 = 123.4 ± 13.4 (SE) nl O2/cm3·s ( N = 38, within 6 muscles) at a baseline interstitial Po2 of 50.8 ± 2.9 mmHg. This technique has opened the opportunity for monitoring respiration rates in microscopic volumes of functioning skeletal muscle.

Corrosion at a Holiday in an Organic Coated-Metal Substrate System

CORROSION ◽  
1976 ◽  
Vol 32 (8) ◽  
pp. 316-321 ◽  
Author(s):  
B. D. CRAIG ◽  
D. L. OLSON
Keyword(s):  
Corrosion Rate ◽  
Ion Transport ◽  
Water Uptake ◽  
Galvanic Corrosion ◽  
Organic Coating ◽  
Metal Substrate ◽  
Galvanic Current ◽  
Factors Affecting ◽  
Coated Metal ◽  
Significant Factors

Abstract The galvanic corrosion at a holiday in an organic coating was investigated by measuring the galvanic current as a function of time. It was found that an area of exposed metal (holiday) in the coating will be anodic to the coated areas. Water uptake and ion transport of the coating are significant factors affecting the corrosion taking place at a holiday. Thickness of the coating was also found to be an important influence on the corrosion rate at a holiday.

Continuous corrosion rate measurement by noise resistance calculation

2001 ◽  
Vol 50 (5) ◽  
pp. 1059-1065 ◽  
Author(s):  
A. Lowe ◽  
H. Eren ◽  
Y.J. Tan ◽  
B. Kinsella ◽  
S. Bailey
Keyword(s):  
Corrosion Rate ◽  
Rate Measurement ◽  
Noise Resistance ◽  
Corrosion Rate Measurement
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