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A standardised technique has been. developed for preparing potassium bromide discs of barbituric acids for infra-red analysis, and the spectra obtained do not depend on the methods used for purifying and preparing the samples. The technique is suitable for identifying toxicological samples, as only small amounts are needed. BECAUSE of the importance of barbiturate drugs in medical and toxicological work, numerous physical methods of identification have been examined.l Infra-red absorption and X-ray diffraction techniques have been the most promising, as both methods give many possible points of identification, varying in relative intensities, by which a compound can be distinguished. Both methods suffer from the disadvantages that they are sensitive to barbiturate

Low density polyethylene (LDPE) is by far the most common polymer film material. Bags and pouches made from LDPE are readily available and are being used as packaging by peddlers of illegal drugs and by other criminals. It is therefore important that an investigator have ways of comparing LDPE bags used in the commission of a crime with bags belonging to a suspect.

After the identification of 5-10 % of trans-unsatur-Na2HPO4 (I 0-05) and 0-0217M-KH2PO4 +00095M-Na2HPO4 (I0.05). Potassium chloride was added to these buffers to bring the total ionic strength up to 0.1, 0-2, 0-3 and 0-5.