Abstract： AS 4699:2000 pdf download.Zinc and zinc alloys—Determination of impurities and alloying elements—Atomic emission spectrometric method. Standard deviation and tolerance shall he in the same units. NOTE: Tolerance relates to reporting lim...

AS 4699:2000 pdf download.Zinc and zinc alloys—Determination of impurities and alloying elements—Atomic emission spectrometric

method.

Standard deviation and tolerance shall he in the same units.

NOTE: Tolerance relates to reporting limit, e.g. a reporting limit of 0.01 is equivalent to a tolerance of ±0.01.

The calculation for a multi-elemental analysis procedure should be carried out for all significant elements and the number of

sparks should be based on the element with the highest standard deviation. Production samples, rather than reference materials,

should be used for standard deviation calculations in spark analysis of metals, because heterogeneity is a major factor affecting

precision. Standard deviation is determined from a minimum of 10 sparks performed on a process sample of similar composition to

that being analyzed. If the number of sparks required is greater than can be performed on one sample surface either—

(a) increase desired tolerance;

(b) improve sample homogeneity; or

(c) improve instrument performance.

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