Determination of polyacrolein labeled with tritium or carbon-14
| Autor: | Robert J. Carr, B. E. Gordon |
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| Rok vydání: | 2007 |
| Předmět: | |
| Zdroj: | Journal of Polymer Science Part C: Polymer Symposia. 8:71-85 |
| ISSN: | 1935-3065 0449-2994 |
| DOI: | 10.1002/polc.5070080108 |
| Popis: | This paper describes methods of analysis for radioactively labeled polyacrolein in solutions, powders, and on paper. The tracers, tritium and carbon-14, were used because of interferences encountered in some of the analyses. Briefly, the methods involve combustion of the sample in the Sohoniger flask, absorption of the desired product of combustion in a suitable solvent, followed by liquid scintillation counting. For tritium analysis, ethanolic toluene was the absorbent for the product water, and for carbon-14 methanolic benzylamine was used to absorb the carbon dioxide. Two sources of error in the analysis were discovered, namely, soot and dissolved oxygen. These seriously affected the accuracy and precision of the results. A filtration step followed by an equilibration with air resulted in satisfactory analyses. The use of benzylamine to absorb carbon dioxide has the added advantage of permitting the determination of the weight per cent of carbon by a simple titration with base. The advantages of the tracer method for polyacrolein are (1) specificity, (2) multiple analyses (>20 combustions per day), (3) convenience, and (4) low cost in combustion equipment. |
| Databáze: | OpenAIRE |
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