Dry ashing method

Samples of heavy duty and cmde oils, lubricating oils, worn oils, organic polymers, plastics, grease, etc., may be ashed with the retaining acid PTSA using the dry-ashing method up to temperatures of 650°C. This compound will retain most mono- and divalent states of elements in samples. The structure of PTSA is ... 

Gorsuch, T.T. (1959) Sample preparation using dry ashing method, Analyst (London), 84, pl35. 

The metal salts are added to plastic products as organometallic, metallocenes or inorganic salts. The ashing method of sample preparation is only suitable for elements that do not volatilise during the heating cycle. The results obtained and recorded in Table 4.10 are reproducible for most elements with the exception of Pb and Sb in which some loss had taken place using the opened dry ashing method even in the presence of PTSA. 

Analysis of Type C and D Fractions for Metal Content Using Dry Ashing Method [6]... 

Table 6.5 Results of analysis of metal for metal content of Type A and Type B adhesives after sample preparation using dry ashing method...

Serious cadmium losses have been reported when organic samples were ignited and ashed by the dry-ash method (12), This was confirmed during work of the Project. A sample of spiked crude oil was ignited to a carbonaceous residue, and the carbon was burned off in a muffle furnace after the residue was wetted with a few drops of sulfuric acid. The inorganic ash was solubilized with dilute hydrochloric acid and then was analyzed by flame atomic absorption. Recovery of added cadmium averaged 78%. 

The micro-dry ashing method proposed by Schonberger et al. (1984) or the cool finger oxygen ashing using Trac-O-mat is useful for these specimens. 

Adrian, W.J. (1973). A comparison of wet pressure digestion method with other commonly used wet and dry ashing methods. Analyst. 98, 213-216 Alcock, N.W. (1987). A hydrogen peroxide digestion system for tissue trace metal analysis, Biol.Trace Bern. Res. 13, 363-370... 

Adeloju, S.B., Bond, A.M. and Noble, M.L (1984). Evaluation of some dry ashing methods for anodic stripping voltammetric determination of cadmium and lead in biological materials. Anal. Chim. Acta 161,303. 

Dry ashing methods compete with the following techniques for sample dissolution of organic and biological species for elemental analysis ... 

Our own extensive experience in the field of sample preparation has shown that, better than the other known mineralization procedures, dry ashing methods ensure the quantitative decomposition and elimination of organic matter. Usually, these procedures... 

In course of preparation of oil and phosphatide samples, we used the ruling standard methods one one hand the so-called acidic extraction method, and on the other hand, the dry ashing method following a pre-destruction with sulphuric acid. 

The Dry Ashing Method for Preparing Sewage Sludges, American Laboratory, August 1982. 

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