Determination of the Impregnant Concentrations on ASC Type Charcoal. A Magnetic Susceptibility Study
DEFENCE RESEARCH ESTABLISHMENT OTTAWA (ONTARIO)
Pagination or Media Count:
A non-destructive test has been developed to monitor the impregnants in charcoal. A study of some commercially-produced and custom-made ASC- whetlerties indicates significant increases in the measured magnetic susceptibility from that of the base charcoal. Correlations between the measured susceptibilities and the concentrations of copper and chromium by a linear mathematical model are established with reasonably good fit for the custom-made charcoals. It is concluded that the magnetic susceptibility data would be best utilized as a qualittative tool for the assessment of metal impregnants on charcoal, rather than for precise quantitative analyses. Some preliminary data on the magnetic susceptibilities of ASC-whetlerites co-impregnated with TEDA are also presented. Magnetic susceptibilities measured on the same charcoal samples by commercial instruments indicate that although they show similar trends as the Gouy balance, these instruments are subject to too much variation to be of any qualitative andor quantitative use for ASC charcoals.
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