High Pressure Oxygen Combustion

High pressure oxygen bombs are made from thick walled stainless steel vessels with capacities from 100 to 300 ml for general use. The sample to be burned is weighed into a 

Liquid and solid samples are placed in an opened cup while volatile samples are placed in a gelatine capsule and placed in the cup as for a normal sample. A suitable absorption solution is placed at the bottom of the bomb along with the prepared sample. It may be necessary to include an aid with combustion resistant samples as a support to combustion and such additives are low molecular weight paraffin oils, ammonium nitrates, benzoic acid, decalin, etc. 

The advantages of this technique are that it is easy to use and solutions obtained are easy to analyse. The solutions contain virtually no contamination and there is little or no loss of analytes by volatilisation. The disadvantages are that extreme care must be taken during use and it can only handle one sample at a time. 

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Analysis of Metal Spiked Oil Blends Using High Pressure Oxygen Combustion for Metals Content... 

Table 5.16 Results of metal analysis of high viscosity 75 oil blend spiked with metals using high pressure oxygen combustion...

Digestion of samples using high pressure oxygen bomb combustion is an excellent technique for sample preparation, particularly trace metal analysis. This technique can be applied to most plastics provided that small sample ( 0.25 g) of fine grain sizes of plastics are used. The solutions obtained are clean and easily analysed for metal content against standards prepared in the same solution added to bomb. 

Table 4.10 Results of analysis of selected plastic materials for listed metals by ICP-AES after microwave acid digestion (A), dry eishing to 650°C with PTSA (B) or high pressure oxygen bomb combustion (C)...

Where total halide, e.g., chlorine, is required then total combustion in a high-pressure oxygen bomb should precede the anion ion chromatography analysis. 

A preliminary study on the toxic combustion products testing of polymers used in high-pressure oxygen systems. http //ntrs.nasa.gov/archive/nasa/ casi.ntrs.nasa.gOv/20100041342 20100 44104.pdf (accessed 1 September 2011). 

D5 the semi-closed CBT plant with full oxidation—oxygen supplied to the combustion chamber instead of air, with CO2 removal at high pressure level ... 

Compound-specific isotope analysis (CSIA) by GC-IRMS became possible in 1978 due to work of Mathews and Hayes [634], based on earlier low-precision work of Sano et al. [635]. The key innovation was the development of a catalytic combustion furnace based on Pt with CuO as oxygen source, placed between the GC exit and the mass spectrometer. The high pressure of helium (99.999% purity or better) ensures that all gas flows are viscous. After being dried in special traps avoiding formation of HC02 (i. e., interferes with 13C02) by ion-molecule reactions in the ion source, the C02 is transmitted to a device that regulates pressure and flow and then into the ion source [604]. 

The combusted air and fuel stream (stream 12) from the high-pressure fuel cell are expanded (stream 13) in a turbine expander. The work of this turbine is used to drive the low- and high-pressure air compressors. The reduced pressure exhaust stream (stream 13) is utilized as the low-pressure fuel cell oxidant stream. Although vitiated, it still has 15% oxygen. The low-pressure TSOFC operates at 0.62 volts per cell, and fuel and air utilizations of 78 and 21.9%, respectively. The spent air and fuel effluents are combusted and sent (stream 14) to the low-pressure power turbine. The turbine generator produces approximately 1.4 MW AC. The low-pressure exhaust (stream 15) still has a temperature of 649°C (1200°F) and is utilized to... 

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