2017-10. All’s Well That Ends Well

In his final column before retirement, John Dolan reminisces about his years as the author of “LC Troubleshooting,” and some of the hcanges that have taken place in liquid chromatography (LC) technology during that time. LCGC 35(10) 746-750 (2017) John W. Dolan *ed. notes: (1) This is John Dolan’s last […]

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2015-12. Detective Work, Part II: Physical Problems with the Column

Particulate matter from the sample or the system can cause havoc in the chromatogram. LCGC 33(12) 894-899 (2015) John W. Dolan Errata: Note that there was a transposition error in this and two associated articles. In the referenced table, the words “Symptom” and “Cause” have been reversed. That is, “Cause” […]

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2012-10. The Role of the Injection Solvent

The solvent chosen for injection can affect the appearance of chromatograpic peaks. LCGC 30(10) 898-902 (2012) Bandar Alshli and John W. Dolan Erratum: (from 30(12): equation 2 should read: w = 4 tR / N^0.5.With this change, all the calculated values of peak widths and recommended injection volumes should be […]

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2012-8. Questions from Afar

Retention-time drift, temperature control, and broad peaks from a new column are the topics in this month’s discussion. LCGC 30(8) 634-636 (2012) John W. Dolan

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