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orgchem563

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Carbonic acid: 12.5 percent to 14.5 percent.
Test sample. Place 7.00 mg of the substance to be examined in a tin capsule. Seal the capsule.
Reference sample. Place 7.00 mg of almagate CRS in a tin capsule. Seal the capsule.
Introduce separately the test sample and the reference sample into a combustion chamber of a CHN analyser purged with helium for chromatography R and maintained at a temperature of 1020 ¡ãC. Simultaneously, introduce oxygen R at a pressure of 40 kPa and a flow rate of 20 mL/min and allow complete combustion of the sample. Sweep the combustion gases through a reduction reactor and separate the gases formed by gas chromatography ( 2.2.28 ).
Column:
¡ª size: l =2m,Ø=4mm;
¡ª stationary phase: ethylvinylbenzene-divinylbenzene copolymer R1.
Carrier gas: helium for chromatography R.
Flow rate:100 mL/min.
Temperature:
¡ª column: 65 ¡ãC;
¡ª detector: 190 ¡ãC.

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