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| SPECTRO-CHEMICAL DETERMINATION OF TRACES OF HARMFUL IMPURITIES (Pb, Bi, Sn, Sb, As) IN ONE KIND OF Ni-ALLOYS |
| WANG CHN-SHU; HU HSIN-HUI; Y PO |
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Cite this article:
WANG CHN-SHU; HU HSIN-HUI; Y PO. SPECTRO-CHEMICAL DETERMINATION OF TRACES OF HARMFUL IMPURITIES (Pb, Bi, Sn, Sb, As) IN ONE KIND OF Ni-ALLOYS. Acta Metall Sin, 1966, 9(1): 98-106.
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Abstract A spectro-chemical method, for the analysis of trace of impurity elements (Pb, Bi, Sn, Sb, As) in one kind of Ni-alloys, was developed, with D.C. arc powder excitation following H_2S pre-separation.Owing to the needs of long periods of operation and large amount of reagents, the use of A. R. grade reagents led to a considerable blank value. After using purified reagents, the blanks (for Pb, Sn) were reduced to a μ-gram range.During the arcing of the specimens, the evaporation of arsenic was found to be very imcomplete. The addition of P_2O_5 accelerated its evaporation very obviously. While the sample being utilized efficiently, the sensitivity of arsenic increased 4—5 times. It was noticed that at the position of the line As 2349 (?), the band spectra of carbon ignited in air was very obvious and a correction must be made.Results of experiments showed that standard samples could be prepared by the H_2S treatment of pure standard solutions. The usual blank correction of the matrix could thus be avoided.An analytical procedure was suggested and the results of three specimens were listed. These data showed teat the lower limits of analysis of this method were: Pb:0.0001%, Sn, Sb:0.0002%, As:0.0003% and Bi:0.00002%.
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Received: 18 January 1966
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[7] 沈玉其:化学通报,1963,(2) ,22． |
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