Metal Finishing Guide Book

2011-2012 Surface Finishing Guidebook

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443 Sample Synthetic chromium solution* Bath 17 Bath 18 Aliquiot, ml 4 ml 4 ml + 1 ml 4 ml 4 ml 4 ml + 1 ml 4 ml + 2 ml 8 8 0.13 0.05 2.65 ± 0.038 0.046 2.86 ± 0.015 0.018 4.8 9.6 4.73 9.85 Synthetic solution : HEEF - 25R +1N H2SO4(248 g/l CrO3 + 2.7 g/l SO4)) Table 1. Comparison and reproducible results of the determination of sulfates in chromium plating solution. Aliquiot + 0.1N H2SO4 n R=Xmax - Xmin, g/l 8 0.09 Volumetric EDTA methd, g/l ± g/l Sr 2.72 ± 0.026 0.032 4.8 4.85 2.81 2.92 Added, mg Determined, mg Gravimetric method, g/l

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