Abstract
Suspension growth experiments were performed using the “constant composition method”, in order to quantify the influence of the growth inhibitor 1-hydroxy-ethylidene-1,1-bisphosphonic acid (HEDP) on the growth rate of gypsum at various selected growth conditions. During each set of experiments only one growth condition was varied, being either the HEDP concentration, the supersaturation or the pH of the solution, or the initial mass of added crystals. Additionally the adsorption of HEDP onto the crystal surface was measured by XPS to determine the surface coverage needed for inhibition.
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