title: Formaldehyde interference with fluorescence determination of morphine in urine.
mesh_terms: D002855:Chromatography, Thin Layer; D005188:False Negative Reactions; D005470:Fluorometry; D005557:Formaldehyde; D006801:Humans; D009020:Morphine / Q000652:urine*
chemical_list: D005557:Formaldehyde; D009020:Morphine