2,6-diacetylpyridine bis(arylhydrazone) derivatives as analytical reagents for uranium

The analytical properties of two compounds from a class of new complexing reagents for uranium have been investigated. The compounds, diacetylpyridine bis(furoylhydrazone) (H(2)dapf) and diacetylpyridine bis(pyridylhydrazone) (H(2)dapp), were synthesized and the extraction, resin sorption, and colorimetric properties of their metal complexes examined. The uranium-H(2)dapf complex forms in solutions at pH 3 and can be used to determine uranium colorimetrically. The system obeys the Lambert-Beer law between 0.72 and 10.8 ppm uranium with a molar absorptivity of 1.5 x 10(4) 1.mole(-1).cm(-1) at 400 nm and 3.5 x 10(4) 1.mole(-1).cm(-1) at 350 nm between pH 3 and 8. Interferences are masked with EDTA.