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Detectors
Some chemical problems can also arise when using the NPD. Because it is a trace
detector, be careful not to contaminate the analytical system.
Glassware must be very clean. Phosphate detergents should be avoided, so acid washing
of glassware followed by distilled water and solvent rinsing is recommended.
Solvents should be checked for purity. Chlorinated solvents and silanizing reagents can
decrease the useful lifetime of the alkali source; excess reagent should be removed prior
to injection, if possible.
Phosphate-containing leak detectors, phosphoric acid-treated columns or glass wool,
polyimide-coated columns, or nitrogen-containing liquid phases can add noise to the
system and should be avoided.
Contaminants
Glassware
Solvents
Other Contamination Sources
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