Gravimetric Dilution; More Accurate than Volumetric

Solutions prepared using volumetric glassware are inherently inaccurate because of the density change of the solvent as the laboratory changes temperature. The magnitude of this error can be understood by referring to Table 1. Since Borosilicate (Pyrex™) glassware changes volume by only 0.013% over the same temperature span, the errors caused by this volumetric change can easily be as high as 0.5%.

Modern analytical instruments can routinely measure to an accuracy much better than 0.5%; however, in order to reach this potential, the solutions used in these techniques must be prepared to an accuracy three to ten times better (0.16% to 0.05%).

The SoluPrep prepares solutions gravimetrically and can routinely achieve an accuracy of 0.02%. This accuracy is not affected by laboratory temperature changes. In addition, the SoluPrep contributes to good laboratory practice (GLP) by providing a permanent record of every solution prepared (date, time, concentration, operators initials) and by printing a label for each solution.