Oxygen bomb combustion methods

The Determination of Selenium. The most difficult trace element to determine in coal by wet chemical methods is selenium. Two alternative dissolution techniques can be used—H. L. Rooks combustion method (7) and the oxygen bomb combustion method (4). Also, two alternative analytical methods can be used—the hydride evolution method (5) and the graphite furnace method. 

A modification of the oxygen bomb combustion method (ASTM D-2361) for the determination of chlorine consisted of acidifying a solution of the adsorbed combustion products and titrating the chlorine potentiometrically. A potentio-metric titration was also tried for the determination of chlorine by the oxygen flask method. Combustion products, including chlorine, were absorbed in sodium hydroxide (NaOH), and the chloride was measured using silver-silver chloride electrodes. Although there was no statistical difference in results obtained from potentiometric titration and the Eschka procedure, the latter was more precise. 

Sample Preparation Using Oxygen Bomb Combustion Method... 

Analysis of Epoxy Adhesives for Ge and B Content Using Oxygen Bomb Combustion Method... 

Table 6.20 Results of analysis of epoxy adhesives using the oxygen bomb combustion method...

ASTM D-3684. Standard Test Method for Total Mercury in Coal by the Oxygen Bomb Combustion/Atomic Absorption Method. 

The first step in analysing plastics for metals content in polymers by ICP-AES technique is that they must be prepared in solutions that are suitable for nebulization. There are four general methods applicable for sample preparation for metal analysis by ICP-AES and they are solvent dissolution of some plastics dry ashing using a muffle furnace acid digestion using a microwave oven and oxygen bomb combustion. 

The concentration of metals that are detrimental to catalysts added can vary between 20.0 ppm for Fe to 100 ppm for Ni and lOOOppm for V. The presence of these metals necessitates the need for analysis of these metals to determine their concentrations prior to the cracking process. The best method to analyse these oil samples needs to be rapid and accurate. Careful selection of the method either from experience or by trial and error may be applied depending on the metal and the concentration. Sample dissolution in a solvent or solvent mixture is considered the easiest but may not be suitable for low limits of detection. Destructive sample preparation methods, i.e. oxygen bomb combustion, microwave acid digestion followed by pre-concentrating may be required for trace analysis and/or with the aid of a hyphenated system, e.g. ultrasonic nebuliser. Samples prepared by destmctive methods are dissolved in aqueous solutions that have very low matrix and spectral interferences. 

Method. Weigh accurately approximately 1.0 g of each cyanoacrylate adhesive into a cup attached to the lid of the oxygen bomb combustion vessel. To the vessel add 5.0 ml of water and fill with oxygen to 30 atm. The bomb is fired according to manufacturer s instructions. 

In the case of fluorine, doubts were thrown on the reliability of the oxygen bomb combustion. This method might give correct results for the analysis of some coal matrices but fusion should be systematically used in the case of fly ash consequently. 

ASTM. 201 ly. Test Method for Mercury in Cord by the Oxygen Bomb Combustion/Atomic Absorption Method (ASTM D3684). Annual Book of ASTM Standards, Section 05.05. American Society for Testing and Materials, West Conshohocken, PA. 

A PET oligomer isolation method has utilised chloroform extraction in a Parr bomb lined with a Teflon-TFE fluoro-carbon resin [40]. The analytics of fluoropolymer processing aids (combustion analysis, XRF, EUR, 19F NMR, OM) have recently been described [29]. Combustion analysis (Parr Oxygen Bomb Calorimeter) can be used for quantitative analysis... 

The American Society for Testing and Materials (ASTM) has developed a series or standard test methods for both solid and liquid fuels in oxygen bomb calorimeters. Advanced combustion calorimeters are capable of performing 8 to 10 tests per hour with a precision of 0.1%. 

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