Abstract
This paper deals with a simulated test of biogenic mineralization made with a blue- green alga species, Spirulina platensis. The data in the experiment were recorded by a computerized surveying system. The influence of algae on the accumulation of phosphorus by changing their microenvironment to promote the formation and deposition of phosphate was studied. The results show that the pH value of cultural liquor rose up to 10 and the redox potential (Eh) may drop by 100-200 mV during the algal logarithmic growth stage, and the cultrual liquor was changed into a medium with a weakly reducing condition. At the end of the logarithmic growth stage white deposits of Na2Ca(CO3)2 · 5H2O and Ca2Mg (PO4)2 · 2H2O were formed on the floor of cultural containers. The test presented a valuable evidence for the theory of biogenic mineralization.
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