John W. Dolan

John Dolan has been writing "LC Troubleshooting" for LCGC for over 20 years. One of the industry's most respected professionals, John is currently the Vice President of BASi Northwest Laboratory, McMinnville, Oregon and a principal instructor for LC Resources, Walnut Creek, California. He is also a member of LCGC's editorial advisory board.

John Dolan examines some questions he recently received concerning the changes that took place in the 2009 edition of the United States Pharmacopoeia.

What can be expected when the column diameter is changed?

What should you do when a peak is too small or too large?

What to do when a peak is too small or too large

John Dolan looks at ways to get to the root of some of the most common problems encountered in the lab.

Where to place the blame when something goes wrong.

What's the best way to integrate a peak?

This month's column discusses the type of problems one can encounter when using methods supplied to us by other.

Remember the Rule of One — change just one thing at a time