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N. A. Puretskii, M. A. Proskurnin, A. V. Pirogov

Determination of diacetyl with spectrophotometry and thermal-lens spectrometry


The conditions for spectrophotometric and thermal-lens determination of diacetyl with creatine and 2-naphthol are proposed. The obtain detection limit for spectrophotometry (at 527 nm) of 10 ng/mL is fivefold lower than the existing values of spectrophotometric determination of diacetyl. The spectrophotometric procedure was used as is for thermal-lens determination of diacetyl (514.5 nm, excitation power 40 mW). Thermal lens determination is characterized not only by a twofold decrease in the detection limit (to 2 ng/mL, which is comparable to the determination of diacetyl with gas-chromatography–mass spectrometry, the detection limit 0.7 ng/mL), but by an enhancement of other performance parameters of the determination. It was shown that contrary to gas chromatography, ethanol does not interfere with both spectrophotometric and thermal-lens determination of diacetyl.
Moscow University Chemistry Bulletin.
2009, Vol. 50, No. 2, P. 116

Copyright (C) Chemistry Dept., Moscow State University, 2002
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