Abstract
The influence of glutamic acid on calcium oxalate precipitation was investigated. The model system was a mixture of different hydrates of spontaneously precipitating calcium oxalate, e.g. calcium oxalate monohydrate, calcium oxalate trihydrate and less than 5% of calcium oxalate dihydrate. Addition of glutamic acid into the precipitating system affected the composition of the solid phase by increasing the content of COM by about 20%. In addition in the presence of glutamic acid the rate of crystal growth was lower and substantial aggregation was observed. The latter effects were strongest in a certain narrow range of low concentrations (3–5 ppm) of glutamic acid.
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