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Occurrence and Stability of Calcite in the Maumee River¹

ABSTRACT

The occurrence of secondary (precipitated) calcite and the concentrations of parameters controlling calcite dissolution-precipitation were monitored at six sites in the Maumee River drainage system during 1975–76. Secondary calcite was identified on the basis of calcite/dolomite ratios as determined by X-ray diffraction and a volumetric procedure employing the Chittick apparatus. Additional evidence for the occurrence of secondary calcite as well as crystal morphology was obtained by optical microscopy. A positive correlation between nigh calcium concentrations and the occurrence of secondary calcite could not be established; however a relationship between algal blooms and calcite formation was noted. It is concluded that a reduction in the CO₂ content of the stream due to algal biomass production is the factor responsible for initiating calcite precipitation in the Maumee River system. Calcite equilibria in the stream is quite dynamic with secondary calcite appearing and disappearing in relatively short periods of time.

Key Words: algae • carbonate equilibria • carbon dioxide partial pressure • ion-pairs • calcite precipitation

¹ Contribution from the Dep. of Agron., Ohio Agric. Res. and Dev. Center, Wooster, (approved for publication as J. article no. 92-78) and Ohio State Univ., Columbus. This research was supported by a grant from USEPA and constitutes part of the PLUARG research program.

² Research Associate and Associate Professor, respectively, Dep. of Agron.

Received for publication June 5, 1978.