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Matrix modifiers in graphite furnace atomic absorption analysis of trace lithium in biological fluids

✍ Scribed by George A. Trapp

Publisher
Elsevier Science
Year
1985
Tongue
English
Weight
442 KB
Volume
148
Category
Article
ISSN
0003-2697

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✦ Synopsis

The use of KH2P04/NH4N0, as matrix modifier eliminates severe interference effects on the atomic absorption analysis of lithium in biological fluids. This enables determination of trace lithium in microliter size samples with absolute sensitivity (0.0044 absorbance) of 2 pg. There is no requirement for standard additions experiments to correct for interferences in specific matrices such as serum and saliva. The biological half-life of trace lithium was 16.9 + 2.8 h. Saliva lithium is a good estimate of serum level; the two are highly correlated (r = 0.97) and saliva level is about three times serum.

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