N-nitrosodiethanolamine has been found to be present at a concentration of 0.02 to 3 percent in several brands of synthetic cutting fluids. Its identity was confirmed by three independent techniques: (i) by measuring the retention times on two different high-performance liquid-chromatography columns, (ii) by dehydration to N-nitrosomorpholine, and (iii) by preparation of the O-methyl ether derivative.
A simple and highly sensitive procedure is described for the recovery and quantitative identification of nanogram quantities of preformed N-nitroso compounds in the whole mouse. This procedure has also been applied to the quantitation of N-nitroso compounds after they have been biosynthesized from trace amounts of precursors. The whole animal is frozen in liquid nitrogen and homogenized to a frozen powder; the powder is then extracted and analyzed by a thermal energy analyzer interfaced to a gas-liquid and a high-pressure liquid chromatograph.
Die meisten in den USA verwendeten synthetischen Kühlöle, die zur Verringerungder beim Schneiden und Bearbeiten von Metall entstehenden Temperaturen einge‐setzt werden, enthalten bis zu 45% Triäthanolamin und 18% Natriumnitrit.
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