Abstract
The within-day precision of time-based gel permeation chromatography (GPC) measurements on small-particle supports has been measured as 1.0% for M n and 1.2% for M w over the calibration range. This variation is shown to be mainly due to flow-rate variations, which are long term compared to the time scale of the runs. The contribution of detector noise as evaluated by cubic spline data smoothing was found to be negligible. In comparison with the precision in the measurements of the calibration standards by absolute methods such as light scattering and end-group analysis, the random errors in the GPC measurements could be neglected in the calibration procedure. It is thus possible to obtain time-based high-performance GPC measurements on small-particle supports, not only of high accuracy but also of high precision without any correction.
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