ATOMIC ABSORPTION SPECTROMETRIC DETERMINATION OF TRACE ELEMENTS IN COAL BY USING AN ACID DIGESTION IN SEALED POLYTETRAFLUOROETHYLENE VESSEL

概要

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As a wet digestion method of coal, digestion with nitricperchloric acid mixture was studied by using a sealed polytetrafluoroethylene(PTFE) digestion vessel. A PTFE inner vessel modified to this purpose was of 50 ml capacity, put in an outer stainless steel vessel, and sealed tightly with a PTFE 0-ring inserted between the vessel and a cover plate. Coal containing up to 86 % fixed carbon was sufficiently decomposed with the nitric-perchloric acid mixture (1:1) by heating at 150-160 ℃ for 7-H h. The sample preparation consisted of further digestion with hydrofluoric acid, followed by addition of boric acid, aqueous dilution and filtration. Nine elements in NBS I632a coal were determined. Matrix elements of a calibration standard require no precise matching to the sample solution.
社団法人日本分析化学会の論文
1984-08-05