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MDI-2PP is extracted from the filter in a 4 ml vial by use of an acetonitrileDMS0 mixture in a ratio of 90 : 10. This extract is directly used for HPLC analysis. 6 mm Nucleosil 100 C,. Oven and tray temperatures are kept at 30°C and 10°C, respectively. A solvent gradient using the components acetonitrile, H,O and aqueous buffer solution is used. 0 ml/min. The MDI-2PP chromophore is excited at 240 f 20 nm. The fluorescence response is monitored at 370 f 20 nm. 3 min, resulting in a better separation from underivatized 2PP and possible interference.

Tebuconazole. MSD gives even better detection limits (1 -3 ng/m3) by selected ion monitoring. It was also possible to identify unknown peaks as decomposition products of dichlofluanid and propiconazole which came out with less than 2 % of the original WPA air concentration. 3-3. MSD chromatograms. 3 Sampling and Analysis of Wood Preservatives in Test Chambers 39 For quantification 4-(4'-chlorobenzoy1)pyridine as internal standard was added to the extract. Concentrations of WPA were calculated with determined relative response factors.

1979): Improved method for determination of traces of isocyanates in working atmospheres by high-performance liquid chromatography. J. Liq. , 2, 763-774. Sango C. and Zimerson E. (1980): A new reagent for determination of isocyanates in working atmospheres by HPLC using UV or fluorescence detection. J. Liq. , 3, 971 -990. Sawicki E. and Carnes R. A. (1968): Spectrophotofluorimetricdetermination of aldehydes with dimedone and other reagents. Mikrochim. Acta, 148- 159. Schmidtke F. and Seifert B.

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