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  • Title: [Identification of eleven urea herbicides by thin-layer and gas-liquid chromatography. I. Application to natural waters (author's transl)].
    Author: Deleu R, Barthelemy JP, Copin A.
    Journal: J Chromatogr; 1977 Apr 11; 134(2):483-8. PubMed ID: 858766.
    Abstract:
    By the combined use of two-dimensional thin-layer chromatography and gas chromatography (with an electron capture detector), the authors succeeded in separating and identifying eleven urea herbicides at levels of up to 4 ppb. The method has been applied to natural surface waters.
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