LCGC Europe, Dec 1, 2003 - LC-GC Europe
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LCGC Europe, Dec 1, 2003
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Preserving Data
Preserving Analytical Data for the Long Term
In this article the authors look at the problem of managing analytical data for the long term with regard to controlled access, content preservation, and storage and media management. The pressure for companies to find a long-term archival solution that meets regulatory requirements is discussed.
Baseline Disturbances in HPLC
The Physicochemical Causes of Baseline Disturbance in HPLC — Part II: Column Temperature and Refractive Index Detection
An investigation of baseline disturbances in chromatographic systems is presented and possible causes described. The authors consider the relationship between RI signal change to the time derivative of temperature fluctuations.
Weighting Exponent
Weighted Least-Squares Regression in Practice: Selection of the Weighting Exponent
Kuss demonstrates how to select the weighting exponent and shows how weighting of variances is a valuable and simple tool to achieve realistic prediction intervals (y deviations) and uncertainties of the result (x deviations).
LC Troubleshooting
Extracolumn Effects
This month, the authors try to determine whether a problem, originally attributed to extracolumn effects, was also the result of other contributing factors.
GC Connections
Solid-Phase Microextraction
In this column, the importance of solid-phase microextraction as a separation technique is discussed.
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