Computer Science
Scientific paper
Sep 1953
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1953gecoa...4..143f&link_type=abstract
Geochimica et Cosmochimica Acta, vol. 4, Issue 3, pp.143-156
Computer Science
1
Scientific paper
Replicate analyses by 35 laboratories of a granite and a diabase, especially prepared as standards, give means and standard deviations which should be invaluable for calibration purposes in spectrochemical and chemical laboratories. It is clearly shown that relative error varies inversely with concentration of the constituent (e.g. 0.1% for SiO 2 , 10% for P 2 O 5 ). A test of accuracy has also been made by 11 laboratories, each analyzing a synthetic glass of the proportions found in granite. The composition of the glass is known within +-0.02% for SiO 2 , +-0.01% for Al 2 O 3 and is without significant error for the remaining constituents.The means computed from the chemical analyses showed satisfactory agreement for MgO, CaO, Na 2 O, K 2 O (<0.1%). For SiO 2 and Al 2 O 3 a reciprocal systematic error appeared whereby SiO 2 was 0.4% low and Al 2 O 3 was 0.6% high; total SiO 2 and Al 2 O 3 agreed almost exactly (<0.1%) with the glass standard. As a result of these tests attention is directed anew to the practical but complex problem of evaluating error in a single analysis made by conventional methods. The advantages for many purposes of the more rapid photometric and spectrochemical methods and (for many igneous rocks) of micrometric methods are outlined.
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