The development of new compounds with the potential for drug abuse necessitates a continuous accumulation of analytical data in the forensic laboratory. Also, the identification of excipients and adulterants in drug samples provides a data base that can be used for intelligence purposes. Correlation of cases can provide investigative leads as well as being supporting evidence in conspiracy cases.
Standard reference samples of diatrizoic acid gave 2 different infrared (IR) spectra, x-ray diffraction patterns, and differential thermal and thermal gravimetric curves. One form, the anhydrous acid, shows no weight loss when heated to 170°C. The other form, the dihydrate, loses 5.36% of its weight when heated from 86 to 144°C. The anhydrous diatrizoic acid is the preferred reference standard, because it has an IR spectrum and x-ray diffraction pattern suitable for identification purposes.
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