Problem: Sample carryover

Possible Cause(s): Insufficient number or type of washes Solvent wash vial empty Syringe worn or dirty Sample/solvent mismatch Dirty ALS needle guide Suggested Action(s): Increase number or type of washes Rinse with a variety of solvents Rinse and refill solvent wash vial Clean or replace syringe Ensure samples and solvents, from one vial to the next, are miscible Replace needle guide