Abstract
Analytical errors in atomic absorption spectrophotometry caused by variations in viscosities are minimized by the use of a peristaltic pump. This pump forces aqueous standards and simple dilutions of biologic fluids into the premix chamber at the same rate. Results obtained with the peristaltic pump are compared with results obtained without correction for viscosity differences and results obtained by diluting standards in albumin solutions. Recoveries with positive pressure ranged from 97 to 101% with copper and zinc in simple dilutions of serum.
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