Quantometric Analysis of Phosphorus in White Cart Iron

For the purpose of establishing routine quantometric analysis of phosphorus in white cast iron, a study has been made on various conditions of analytical techniques with the following results.(1) Excitation by a low voltage discharge (L: 360 teH, C: 30 pF, R: 50) gives satisfactory results.(2) Good results with reproducibility of below 4% variation are obtained by 10 sec.of pre-spark time and 20 sec.of constant integration time, the internal standard method being not used.(3) This procedure can be applied to the determination of phosphorus content in the range from 0.04 % to 0.6 %.(4) To raise the accuracy in this procedure, the following effects on the result should be taken into consideration:a) Effect of metallurgical history of the sampleb) Effect of cracks on the sample surface.c) Effect of change in relative positions between exit slit and spectral lines by temperature variation.