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 ?
A single stage CO2 gas membrane separation unit valued at US $11,861,645 will be designed and installed at the Occidental of Elk Hills' Gas Quality Project to reduce the CO2 content in natural gas from 3.
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The ASME-certified 177-metric ton technology complex includes compressors and technology for separating and removing high levels of CO2 content from raw landfill methane gas resulting in pipeline quality methane gas suitable for the commercial natural gas market.
The ASME-certified, 177 metric-ton complex includes compressors and technology for separating and removing high levels of CO2 content from raw landfill methane gas resulting in pipeline quality methane gas suitable for the commercial natural gas market.
The ASME-certified 177-metric ton complex includes compressors and technology for separating and removing high levels of CO2 content from raw landfill methane gas resulting in pipeline quality methane gas suitable for the commercial natural gas market.
The CO2 content of the gas from both zones was a very low 3 per cent.
Associated CO2 content ranged from 10 to 33 percent.
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The Technology Centre Mongstad (TCM DA) shall test at least two different technologies for capturing CO2 from two flue gas sources with respectively low and high CO2 contents.
According to plans, TCM shall test two different technologies for capturing CO2 from two flue gas sources with respectively low and high CO2 contents.