Chemical Stability of Chromium Carbide and Chromium Nitride Powders Compared with Chromium Metal in Synthetic Biological Solutions
Figure 5
Release of chromium from powders of Cr-C, Cr-N and Cr-metal exposed up to 168 h in synthetic biological fluids of different pH and composition (GMB—Gamble’s solution, pH 7.2; PBS—phosphate buffered saline, pH 7.4; ASW—artificial sweat, pH 6.5; ALF—artificial lysosomal fluid, pH 4.5; GST—Gastric fluid, pH 1.7) expressed as the amount of chromium released per amount of chromium in the loaded powder (μg Cr/μg Cr in Cr-N, Cr-C, Cr-metal). Error bars correspond to the standard deviation of triplicate samples. Relatively high standard deviations are related to powder heterogeneity and low released chromium concentrations (<5 μg/L).
