Abstract
The goal of the investigation was to determine the intra- and interday precision of GPC molecular weight data. Typical GPC conditions with organic eluents were chosen to obtain data close to actual conditions. Good precision data not only improves the reliability of results but also the productivity because less time-consuming recalibrations are needed. The intraday relative standard deviations for Mn and Mw were for below 1.5% with the majority below 1.0%. The interday precision from day 1 to day 20 for Mn was 1.4% and 1.3% for Mw. Retention time stability below 0.06% is required to obtain molecular weight precision data below 1%. Fully automated data acquisition, evaluation, and reporting were found to be more precise in comparison to semiautomated with automated data acquisition and interactive data evaluation.
Published Version
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