Abstract

The development of a sensitive arc method for the routine determination of boron in graphite over the range 0.2–1.5 p.p.m. is described. The sample in the form of powder is compressed into pellets with the aid of a phenol-formaldehyde resin as binding medium, and these are arced in graphite holders at 7 A (d.c.). The density of the B I 2497.73 is compared with that of the NO(γ) band component at 2497.14. The effects of possible disturbing factors are considered, and the extension of the method, by means of cathode-ray microphotometry, down to a lower limit of 0.01 p.p.m. boron, is described. The method can be applied to coke and pitch with suitable modifications.

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