Fig. 4From: Evaluating efficiency and stability of calcite scaling inhibitors at high pressure and high temperature in laboratory scaleDecrease of pH (ΔpH) during precipitation in dependence of the inhibitor concentration in a HPHT experiments and b experiments at ambient conditions (from Zotzmann and Regenspurg 2015). The red line marks the ΔpH of half the value obtained without inhibitor so that the first data point above that line represents the MICBack to article page