Abstract

Substantial errors in the determination of zinc by atomic absorption spectrophotometry can be caused by differences in pH among samples and standards. Zinc absorption is constant in the pH range of about 2 to 5. Between pH 5 and 10, a sharp decrease in absorption is observed. With an increase above pH 10, zinc absorption levels off to a constant value. Experimental data suggested that pH variation rather than chemical interferences is primarily responsible for the variation of absorption in zinc analysis. Several possibilities, such as sorption of zinc to container walls, zinc hydroxide formation, zinc complex formation, and zinc oxide formation in flame subsequently attacked by hydrogen atoms, have been considered in an attempt to understand the cause of pH-dependent zinc absorption.

Determination of the absorption coefficient of chromophoric dissolved organic matter from underway spectrophotometry

Giorgio Dall’Olmo, Robert J. W. Brewin, Francesco Nencioli, Emanuele Organelli, Ina Lefering, David McKee, Rüdiger Röttgers, Catherine Mitchell, Emmanuel Boss, Annick Bricaud, and Gavin Tilstone
Opt. Express 25(24) A1079-A1095 (2017)

Slit-Width Effects in Spectrophotometry

W. H. Eberhardt
J. Opt. Soc. Am. 40(3) 172-176 (1950)

Computer Programs for Absorption Spectrophotometry

R. Norman Jones
Appl. Opt. 8(3) 597-601 (1969)

Derivative Absorption and Emission Spectrophotometry

F. Grum, D. Paine, and L. Zoeller
Appl. Opt. 11(1) 93-98 (1972)

Electron Paramagnetic Resonance Studies of Dye-Sensitized Zinc Oxide Layers

Simon Larach and John Turkevich
Appl. Opt. 8(S1) 45-49 (1969)