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W D Hörmann

Publications and source records attributed to W D Hörmann.

10 recordsLinked to original sources
PubMed1994

Residue analytical methods for monocrotophos.

This paper summarizes and reviews a variety of methods that have been and are being used for the determination of residues of monocrotophos. Of the different techniques, gas-liquid chromatography was recommended as the technique of choice because it is sensitive as well as selective. The other techniques reviewed may still be useful in cases where gas chromatography is not available. The recommended methods were described in detail to allow their direct use by experienced residue analysts. Some multiresidue methods that include monocrotophos and may be used for surveillance purposes were briefly discussed.

Animals↗
PubMed1979

Triazine herbicide residues in central European streams.

Triazine herbicide residues were monitored in the rivers Adour, Danube, Garonne, Herault, Loire, Marne, Oise, Rhine, and Rhône from spring 1976 to fall 1977 to determine whether the continued use of the compounds resulted in accumulations of undesirable residues in the streams. Samples were generally collected monthly or bimonthly and analyzed for the parent compounds atrazine, simazine, terbumeton, terbuthylazine, and dealkylated metabolites GS 26571 (2-amino-4-etert-butylamino-6-methoxy-1,3,5-triazine) and G 30033 (2-amino-4-chloro-6-ethylamino-1,3,5-triazine). The compounds were extracted into dichloromethane and quantitated by gas chromatography (GC) with nitrogen-specific detection. Selected results were verified by GC with mass fragmentographic detection. Limit of detection was usually 0.4 mg/m3; 80 percent of all results were below 0.4 mg/m3, 14 percent were 0.4-1 mg/m3, 6 percent were 1-10 mg/m3, and 0.3 percent were higher than 10 mg/m3. Detectable residues were mainly atrazine from the downstream sampling sites. Residues usually peaked during June.

Europe↗