By William Mcadams
Warmth Transmission third version
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Extra resources for Heat Transmission, 3rd Edition
In their setup, a combustion unit consists of two serial ovens at operating temperatures of 340 °C and 650 °C, followed with an oven filled with CuO catalyst and held at 950 °C to ensure complete oxidation to CO2. The CO2 evolved during each combustion step is trapped in a molecular sieve held at room temperature. Upon completion of each combustion step, the trap is flash-heated to 200 °C and the desorbed CO2 is detected with a nondispersive infrared analyzer. By definition, OC is the fraction that evolves at the pre-combustion temperature of 340 °C for 42 min, and EC is the fraction oxidized at 650 °C for 32 min.
1999]. The instrument is usually operated in the red at 685 nm or in the green at 532 nm using AlGaInP diode laser and diode-pumped frequency-doubled Nd:YAG laser as a light source, respectively. At both wavelengths gaseous light absorption can be neglected with minor contribution of NO2 absorption at the lower wavelength, which can be eliminated using appropriate metal inlets. A unique feature of photoacoustic instrument is that it can be calibrated using a gas, something that cannot be done with any of the filter methods.
In other terms, any definition of organic and black/elemental carbon is operational and reflects the method and purpose of measurement. Elemental carbon (EC) is the preferred term in conjunction with thermal and wet chemical determinations which are deemed suitable for the selective measurement of the refractory component. The term implicitly infers that this component consists entirely of carbon, though none of the methods used are capable of determining carbon as an element. The methods which are capable of determining elemental composition are in fact suitable only for the determination of total carbon (TC).