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ISO/CD 15151 | IDF 229
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TableB.1—Selectedemissionwavelengths and second checkwavelengths and interferences for
determinationby ICP-AES.
Element
Wavelengthof emission
(nm)
Sort of “line”
Interference
Ca
210.324
211.276
317.933
422.673
Ion
Ion
Ion
Atom
Y
Cu
324.754
327.395
Atom
Atom
Ti, Fe
Fe
238.204
259.940
239.563
Ion
Ion
Ion
K
766.491
769.897
Atom
Atom
Mg
279.800
285.213
Ion
Atom
Fe
Mn
257.610
293.306
259.372
Ion
Ion
Ion
Fe, Mo, Cr,
Al, Fe
Na
588.995
589.592
Atom
Atom
Ar
P
213.618
214.914
Atom
Atom
Cu, Fe, Mo, Zn
Cu, Al, Mg
Zn
202.548
213.857
Ion
Atom
P
Y
(internal standard)
360.074
410.237
Ion
Atom
B.3 Quantification
B.3.1 General
As spectroscopic techniques are not able tomeasure concentrations directly, but bymeans of a conversion of
the emission signal into concentration, calibration is inevitable. Calibration can be performed by means of a
calibration curve.
B.3.2 Calibrationcurve
A calibration curve is constructed by adding increasing amounts of the substance to be studied to a solution of
a supportingmatrix. Themost difficult condition tomeet ismaking the solutions used for the calibration curve
exactly identical to those for the sample analysis. However, calibration curves are frequently recorded in
solutions containing only the studied compound, whereas the sample itself introduces various other
substances.
Insufficient knowledge about the sample composition may create serious difficulties for matrix matching.
However, if the composition of the samples is very well known, and does not vary too much from sample to
sample, matrixmatching is preferred over standard addition, especially inmulti-element determinations. Often
the ratio of the analyte intensity to the intensity of a second element added to the sample (internal standard) is
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