carbon content

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carbon content

Critical care
A measure of the relative blood concentration of CO2, measured by pH electrodes, by enzymes or based on changes in pH. CO2 content is rarely measured outside of hospital settings.

Ref range
< age 2: 18–28 mmol/L.
> 2 years: venous 22–26 mmol/L.
> 2 years: arterial 22–32 mmol/L.

Decreased in
Respiratory alkalosis, hyperventilation, metabolic acidosis.
 
Increased in
Severe vomiting, gastric drainage, hypoventilation—e.g., emphysema or pneumonia.
 
Physiology
The blood picks up O2 and, as it passes through the lungs, releases CO2, which, with water, are the endproducts of O2 metabolism; some of the CO2 in the blood is changed to bicarbonate (HCO3) and is excreted in the kidneys. Measurement of CO2 is part of “blood gas measurement”, which is used to evaluate the ease with which gases are exchanged through the lungs and determine the factors affecting the acid-base balance, or pH, of the blood.

Specimen
Venous or arterial blood, collected in a specially sealed syringe to avoid contact with air.

Method
Spectrophotometry.
References in periodicals archive ?
It really is connected with the increasing CO2 content of the atmosphere.
The average CO2 content was 30% in a 213-m gas column.
Admiral Bay has now installed a carbon dioxide stripping plant to reduce the CO2 content of the gas to a level that is pipeline quality and has fixed all compressor problems.
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The Council also confirmed that "very demanding" sustainability criteria had to be defined soon, ie that as soon as possible there should be a minimum threshold of 35% (C02 savings compared to CO2 content of the materials used for their production) and 50% no later than 2015.
Our unique CApure process is ideally suited to liquefaction projects as we are able to reduce the CO2 content of the biomethane to below 50 ppm in one step, making liquefaction to bioLNG possible.
The deposit, which has a CO2 content of 13%, is close to being exhausted.
These strategies are based on an improvement in energy efficiency, "significant use of renewables", a reduction in the CO2 content of conventional energy sources ("clean coal") and the development of hydrogen-powered fuel cells for the cars of the future.
In the new project, a process is to be developed for producing plastic components with a CO2 content of at least 20 percent.
One of them is the Wiriagar Deep, a super-giant with gas only having 10% CO2 content, found in 1995.