Obtained results showed that studied chlorophenoxy herbicides are very effective in protection of winter wheat against most of the weeds. Sensitive weeds (Matricaria inodora, Capsella bursa pastoris) were killed eight hours after their application and less-sensitive weeds (Equisetum arvense) 19 days after treatment. MCPA residues declined within the wheat tissues during the next 96 hours. Side effect of the herbicides might be useful in control of the grain aphid, S. avenae.

The application of SPME/GC-MS in order to determine the (4-chloro-2-methylphenoxy) acetic acid (MCPA) residues in winter wheat seedlings tissues has been studied. The optimal conditions for the SPME of MCPA adsorption were 20 min. in 50oC and 6 min. in 220oC for desorption. The chlorophenoxy herbicide showed different level of accumulation in seedling tissues of studied winter wheat cultivars. The application of the SPME/GC-MS method for the MCPA residues monitoring and possible differences in its biodegradation in the studied wheat tissues is discussed.

An analytic method for determination of (4-chloro-2-methylphenoxy)acetic acid (MCPA) residues in soil under cereal cultivation was elaborated. Estrification of the herbicide with methanol has been performed and followed by solid phase microextraction (SPME). Obtained results showed traces of MCPA within the studied soil samples up to 8 weeks, after the herbicide treatment. The herbicide moved within the soil profile to 20 cm of depht. Possible application of the SPME/GC-MS method for monitoring of the MCPA residues within soil under winter wheat cultivation is discussed.

Application of SPME/GC-MS for determination of accumulation of the MCPA (4-chloro-2-methylphenoxy)acetic acid in aerial parts of three groups of cereal weeds: highly sensitive (scentless mayweed, shepherd’s purse), sensitive species (field horsetail, garden cornflower) and resistant ones (corn cockle, wireweed) has been studied. Dichloromethane extract was performed and identification and quantification of the MCPA was done using a gas chromatography-mass spectrometry (GC-MS) system with a selective ion monitoring (SIM). The chlorophenoxy herbicide showed different level of accumulation within tissues of the studied weeds. The highest concentration of MCPA was found within tissues of the sensitive weed species and the lowest within tissues of the resistant ones.
In: „Chemistry for Agriculture 7”. (H. Górecki, Z. Dobrzański, P. Kafarski, red.). wyd. CZECH-POL-TRADE, Prague-Brussels, pp. 967-971