Test Method for Clay and Zeolite in Powdered Laundry Detergents by Atomic Absorption

1995 ◽  
Author(s):  
Keyword(s):  
Atomic Absorption ◽  
Test Method ◽  
Laundry Detergents

Determination of Calcium in Urine and Serum by Atomic Absorption Spectrophotometry (AAS)

1967 ◽  
Vol 13 (2) ◽  
pp. 101-114 ◽  
Author(s):  
David L Trudeau ◽  
Esther F Freier
Keyword(s):  
Atomic Absorption ◽  
Atomic Absorption Spectrophotometry ◽  
Test Method ◽  
Double Blind ◽  
Absorption Spectrophotometry ◽  
Reference Methods ◽  
Free Serum ◽  
Urine And Serum

Abstract The determination of calcium in biologic fluids by atomic absorption spectrophotometry is interfered with by the presence of protein, cations, and those anions that form complexes with calcium. Such interference was overcome when lanthanum was included in a 1:50 dilution of serum or urine. Recovery of calcium added to calcium-free serum was 100%. The S.D. based on double-blind duplicates was 0.22 mg./lOO ml. Excellent statistical agreement was found between the test method and each of the 2 reference methods.

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