Krzyżanowski R., Leszczyński B., Optimization of SPME/GC-MS analysis of chlorophenoxy herbicides. Herba Polonica 50(3-4):

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Robert Krzyzanowski
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5 0ptinalisation of SPMVGC-MS analysis of chlorophenoxy herbicides 99 DlsCUssIoN The experinents showed a ITiglr potential of this unique nricrosanrpling technique arrd higlr efficiency of a CA&PDMS stationary plrase in an analysis of tlre plrenoxy acid herbicides. Several polynreric stationary phases of varying filn tlricknesses and plrase mixtures ale conmercially available [3] and PDMS was earlier reported as the best stationary phase for BTEX compounds, volatile organic conrpottnds [8] and other pesticides [9]. Polyacrylate was mostly used to extract more polar conrpounds, such as pherrols and their derivatives [10], aswellas some pesticides Il1-12], On tlre other hand, it was reported that the extraction efficiency of PDMS-DVB for plrenoxy acid herbicides in aqueous matrices exceeded tlre extraction efficienry of PA, PDMS and CW-DVB I l 3] The optinral herbicide extractiot-l time is determined by the tine required for an analyte to reach equilibrium between the sample nratrix and the stationary plrase. Gerrerally, the herbicide yield increased during longer exposllre times Il3]. The equilibrium tinre and analyte partitiorring into the stationary phase are inversely related to extraction temperature, In the performed stl-rdy tlre optinral fiber exposition to the stirred sample for the tnaximum adsorption tine was found to be 20 min at. 50'C tenrperatllre. On the after hand, the optinrunr suggested SPME extraction conditions are between 55'C and 60"C for triazines [1l], carbanates and thiocarbamate herbicides Il1, 14]. The best conditions for desorption of the studied lrerbicides were 220"C for 6 min and were quite sinrilar to those reported earlier for other compounds Il3, 16-17]. Tlre perfornred experiments showed that properly r.rsed SPME/GC-MS nright be a useflul method of extracting and deternining chlorophenoxy lrerbicide residues in plarrt tissues and surface waters. REFERENCES l. Magdic S, Boyd-Bolarrd A,Jinno l(, PawliszyrJB, Arlalysis of organoplrosplrorus insecticides fronr environnlental sanrples using solid phase nricroextraction.j Chronatogr A 1996; 736: Magdic S, PawliszynJB, Arlalysis of orgarroclrlorine pesticides usirlg solid plrase nricroextractiot-t. J Clrromatogr A l996; 723: Boyd-Bolarrd AA, PawliszynJB, Solid phase nricroextractiotl of tritrogerr contailring herbicides. J Clrronratogr A 1995; 704: Lanrbropotrlou DA, Korrstarrtirrou IK, Albanis TA, Deterlrrinatiorl of ftrrrgicides in natural waters usi1-1g solid phase microextractiotl and gas clrronratograplry coupled with electron capture atrd nlass spectrometric detectiolr.j Clrronratogr A 2000; 893:143-]56. 5, Prosen H, Zupal-rcic-Kralj L, Solid phase microextraction, Trends Alral Chenr 1999; 18: Eisert R, PawliszyrrJ, Newtrends irl solid phase microextractioll. Crit RevArral Clrem 1997; 27:103-35, 7. Albarlis TA, Hela DG, Sakellarides TM, Konstarltirror_r IK, Molritoritrg of pesticide residtres arrd their n-retabolites in stlrface and utrdelgrottrld waters of Inrathia (N. Greece) by means of solid phase extraction disl<s arld gas chronratography.j ClrronratogrA 1998;823:59-7l. *łłtnłłołłxźrą Vo.50, No 3/42004

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