Experiments are carried out to determine the critical size of samples with which accurate analysis can be made using low alloy steel standard samples of 13 mm diameter by point to plane spark techniaue.
It is found that, in the case of high voltage spark, the diameter should be greater than 8mm when 5 sec pre-spark is used, and that if the diameter is 6-8mm 15 sec prespark is necessary.
Accompanying errors seem to be attributed to the self-absorption and the difference in velocity of vaporization.
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