Technical Report
Principal Investigator: John J. Heise ()
Sponsor: GWRI
Start Date: 1967-10-01; Completion Date: 1971-06-30;
Keywords:
Description:
The cyclic nature of concentration and chemical forms of transition metal ions in resevoir waters as the seasons progress has been dileneated. Stratifications of metal concentrations with depth profiles have been followed. This report seeks to confirm the changes in concentration of iron and manganese through the year as temperature, acidity and activity of biota change. Particular attention has been paid to determination of differences in concentrations of certain valence states of manganese and iron by use of electron spin resonance (ESR) absorption and atomic absorption (AA) techniques. ESR was used to determine the concentration of the divalent valence state of manganese (Mn++) and to compare it to the total concentration of manganese as determined by AA.
The results showed that there are significant differences between the amount of manganese found by the two techniques at any one sampling site depth profile. A proportional increase in the Mn++ form of manganese at all the sampling sites was correlated with a progression in season through summer. Proportionally higher Mn++ concentrations were found to occur at lower depths in the hypolimnion compared to the surface epilimnion.
The metal iron was found to be unsuitable for ESR analysis because of its complexion into organic and mineral forms that do not allow valence state ESR analysis.
However, some solid natural mineral deposits from Lake Allatoona which yielded complex ESR spectra were found. The ESR spectra of the metallic deposits suggest that they are made up of some ferro-manganese complex.