|
N. A. Puretskii, M. A. Proskurnin, A. V. Pirogov
Determination of diacetyl with spectrophotometry and thermal-lens
spectrometry
Abstract
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.
Copyright (C) Chemistry Dept., Moscow State University, 2002
|
|
