Investigation of the Reactions of Aquatic Aluminum Through Fluorometry Using Lumogallion

Abstract

<p> A fluorometric method using lumogallion has been shown to be adequate to measure the degree and rate of complexation of aluminum at low concentrations, (1.85 xl0^-6 M), by other ligands such as fluoride and citrate, at a pH of 5.2.</p> <p> The species H2PO4 -, H4SiO4 and SO4 2- do not compete with lumogallion for aluminum at this pH for concentration ratios of less than 100, (competing ion: lumogallion). </p> <p> A rate law for the destruction of the lumogallion complex by fluoride ion has been determined as -r = (-dC/dt)A = ((4.3 x 10^3)[F^-1]^1.8 CA)/(1 - (1.0 x 10^3)[F^-1]^-0.7 CA) where CA is the corrected concentration of the fluorescent complex at any time.</p> <p> This method is proposed to measure aluminum complexes in natural waters.</p>