| Autor: |
Shlomo Levy, Yair Bamberger, Mark Ravreby, Sara Abramovich-Bar |
| Rok vydání: |
1993 |
| Předmět: |
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| Zdroj: |
Advances in Analysis and Detection of Explosives ISBN: 9789048142415 |
| DOI: |
10.1007/978-94-017-0639-1_5 |
| Popis: |
Applications of ion chromatography for determination and identification of chlorate, nitrite and nitrate in various combinations and ratios in actual cases of explosives and explosive residues were investigated. The system consisted of a Dionex Ionpac AS9 column combined with a suppressor column and a conductivity detector. Using a 25 μ1 sample size, linear calibration graphs were obtained in the range of 10–100 ppm for nitrite, nitrate and chlorate. Chlorate or nitrate identification in post explosion residues based on spot tests and an infrared spectrum often do not give satisfactory results. In some cases ion chromatography can be used to replace an unsatisfactory infrared spectrum increasing the confidence in the results and increasing the detection limits. Nitrite in post explosion. residues is a decomposition product and not a component of the explosive mixture per se. In general the infrared spectrum is of poor quality and the Griess test combined with ion chromatography satisfy the criteria of two independent test results. Post explosion residues containing nitrite and nitrate present special problems. Identification based on spot tests (Griess test with and without zinc reduction) and infrared spectra are frequently problematic partially due to unknown interferences in the nitrate spot test and a high ratio of nitrite to nitrate. Ion chromatography can be very useful to overcome many of these problems and give an indication as to whether the problem is due to an unknown interference or a high nitrite: nitrate ratio. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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