Trapping box - dedicated for the 15N/14N ad 13C/12C isotope ratio determination in medical research, food science, agriculture and environmental research
✍ Scribed by J. Oesselmann; Dr.W. Brand
- Publisher
- Elsevier Science
- Year
- 1988
- Weight
- 55 KB
- Volume
- 39
- Category
- Article
- ISSN
- 0883-2889
No coin nor oath required. For personal study only.
✦ Synopsis
In recent years the so-called elemental analyzers, which are used for the determination of the elementary composition of samples regarding C, H, N and O, have reached a high technical maturity. The operating principle of such an analyzer is to burn a sample containing N, C, 0 or H completely to C02, N2 and H20 (Dumas-type combustion). With a modern elemental analyzer complete separation of all combustion gases is achieved. These (pure) gases are therefore ideally suited for isotopic analysis if they are removed from the helium carrier stream by means of a suitable trapping interface. The Finnigan MAT trapping interface family is a system of fully automated cryo and sorption traps designed to obtain clean C02 and/or N2'from a mixture of gases for precise isotope ratio determination.
- The accuracy of the whole system has been tested by using the international NBS 22 standard. The obtained value of -29,57 +0,032 o/oo agrees well with the actual value. 2. The external reproducibility for Acetanilide was measured for 13C to <0,03 o/oo and for 15N toK0,05 o/oo. 3. 13C/12C was determinated on organic material like Sucrose, Coal, Graphite, Kerogen, Oil, Caffeine, Flour and Corn. CARBON-If LABELLING BY MALONIC ESTER SYNTHESIS.