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Linearity in Aqueous Standard Solutions
Aqueous linearity standards were gravimetrically prepared from N.I.S.T. traceable salts and mea-
sured on each of six AVL 9180 instruments, two of each configuration: Na/K/Cl, Na/K/iCa and Na/
K/Li.
Correlation
Parameter Slope Intercept Coefficient Sy*x Range n
Sodium 0.99993 0.0128 0.99995 0.666 51-196 300
Potassium 0.99838 0.0119 0.99919 0.194 2.0-12.6 300
Chloride 0.97556 -0.1775 0.99994 0.674 56-194 100
ionized Calcium 1.01552 -0.0078 0.99980 0.037 0.4-3.3 100
Lithium 0.99850 0.0087 0.99985 0.038 0.3-5.3 100
Linearity in Serum
Linearity in serum was established with the analysis of two specimen sets in non-clinical tests:
commercially prepared serum linearity standards for sodium, chloride and potassium with normal
protein content, and a group of random patient serum samples. All samples were analyzed in pairs on
each of two of AVL 9180 instruments in each configuration: Na/K/Cl, Na/K/iCa and Na/K/Li. and
in pairs on each of the following instrument types for comparision to various methods:
Direct ISE, not flame correlated AVL 983 Na/K/Cl Analyzer
(listed as 98X) AVL 984 Na/K/iCa Analyzer
AVL 985 Na/K/Li Analyzer
Direct ISE, flame correlated AVL 9130 Na/K/Cl Analyzer
(listed as 91XX) AVL 9140 Na/K/iCa Analyzer
Flame Absorbance Emission Spectroscopy IL 943 Flame Photometer
Chloridometry Labconco Digital Chloridometer
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