title: The rapid determination of urinary titratable acid and ammonium and evaluation of freezing as a method of preservation.
mesh_terms: D000328:Adult; D005069:Evaluation Studies as Topic; D005615:Freezing; D006801:Humans; D006863:Hydrogen-Ion Concentration; D007668:Kidney / Q000502:physiology; D008297:Male; D008722:Methods; D011309:Preservation, Biological; D000644:Quaternary Ammonium Compounds / Q000652:urine*; D013997:Time Factors; D014556:Urine
chemical_list: D000644:Quaternary Ammonium Compounds