Chemistry for Toxicity Testing by C.W. Jameson and Douglas B. Walters (Eds.)

By C.W. Jameson and Douglas B. Walters (Eds.)

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26 GENERAL CHEMISTRY CONSIDERATIONS Table 2-5. Summary of Aromatic Amines/Nitros Analysis Number classified: 57 Other activity tree classes represented Alkyl halides (3) Aromatic halides (11) N-Heterocycles (1) N-Nitroso compounds ( 2 ) Hydrazines (1) Significant unclassified chemical structure groups Single, aromatic ring nitro compounds (11) A m i n o - or nitro-substituted anthraquinones ( 3 ) Gaps in knowledge Fused-ring compounds A m i n o - and nitro-substituted aromatic heterocycles FUTURE DEVELOPMENTS The development and operation of the structure-activity tree methodology has demonstrated its potential for application to several practical situations.

A n y more than this requires much more extensive work and expense and generally yields limited information. The commercial formulations of Direct Blue N o . 15 and Acid Red N o . 114 were found to contain too many inorganics to be suitable for bioassay. Press cakes, the materials produced before final formulation, were therefore procured and analyzed. Elemental analyses for sodium, sulfur (total), sulfur (ionic), and chlorine, combined with Karl Fischer analysis for water, indicated as shown in Table 3-2 that the press cakes for both Direct Blue N o .

1 kv. Sample introduction: Temperature programmed direct inlet. G E N E R A L CHEMISTRY CONSIDERATIONS Fragment M/e TESTING COMMERCIAL-GRADE CHEMICALS 49 CONCLUSION The examples discussed in this chapter represent but a few of the instances encountered by M R I in its analytical support programs for the N T P programs which test the toxic potential of environmental chemicals. W e hope these examples have shown some of the problems in characterizing commercial-grade chemicals and in providing data on such chemicals to allow determination of their suitability for toxicity testing.

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