title: Limits of accuracy obtainable in the direct determination by fluorimetry of fluorescent whitening agents in solution.
abstract: In direct determination by fluorimetry the limits of detection are governed by the restricted light stability of fluorescent whitening agents (FWAs) in solution. The initial value of a fluorimetric reading can be registered by a rapid recorder, and in this way very light sensitive traces of FWAs as low as 10 parts per thousand million can be measured be measured with a statistical standard deviation of +/-15% for a single measurement and a reproducibility of +/-50% with a statistical certainty of 99%.
mesh_terms: D001583:Benzoxazoles / Q000032:analysis; D004396:Coloring Agents / Q000032:analysis*; D003374:Coumarins / Q000032:analysis; D005470:Fluorometry / Q000295:instrumentation; D007536:Isomerism; D009281:Naphthalenes / Q000032:analysis; D055585:Physical Phenomena; D010825:Physics; D011720:Pyrazoles / Q000032:analysis; D012996:Solutions / Q000032:analysis; D013056:Spectrophotometry, Ultraviolet; D013267:Stilbenes / Q000032:analysis
chemical_list: D001583:Benzoxazoles; D004396:Coloring Agents; D003374:Coumarins; D009281:Naphthalenes; D011720:Pyrazoles; D012996:Solutions; D013267:Stilbenes