A GC/MSD method for the analysis of metolachlor in cabbage, broccoli, and tomato

Autor:	D. C. MacTavish, A. S. Hamill, J. D. Gaynor
Rok vydání:	1992
Předmět:	Detection limit Residue (complex analysis) biology Soil Science biology.organism_classification Lycopersicon chemistry.chemical_compound Horticulture Agronomy chemistry Brassica oleracea Gas chromatography Agronomy and Crop Science Metolachlor Legume Solanaceae
Zdroj:	Communications in Soil Science and Plant Analysis. 23:1549-1558
ISSN:	1532-2416 0010-3624
DOI:	10.1080/00103629209368686
Popis:	Metolachlor (2‐chloro‐N‐(2‐ethyl‐6‐methylphenyl)‐N‐(2‐meth‐oxy‐1‐methylethyl)acetamide) is being considered for control of eastern black nightshade (Solarium ptycanthum Dun.) in cabbage (Brassica oleracea L. var. capitata), broccoli (B. oleracea L. var. Botrytis) and tomato (Lycopersicon esculentum Mill.). We have developed a rapid, sensitive method to determine metolachlor residues in these commodities to ensure its absence in the edible tissue. The crop material was extracted with methanol, the extract partitioned with hexane, then passed through a silica cartridge and analysed for metolachlor by GC/MSD in selected ion mode at m/z 161. Recovery of metolachlor from fortified plant material was greater than 84%. The method detection limit was calculated to be 0.6 ppb for tomato, 1.1 ppb for cabbage, and 4.2 ppb for broccoli. Metolachlor residues were below the detection limit in all commodities harvested from treatments which received 2 or 3 kg metolachlor/ha.
Databáze:	OpenAIRE
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