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KMID : 0385520090220060480
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Analytical Science & Technology
2009 Volume.22 No. 6 p.480 ~ p.487
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The measurement of dicamba in soil and plants
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Shin Ho-Sang
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Abstract
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The herbicide dicamba (2-methoxy-3,6-dichlorobenzoic acid) in soil and plants was determined by gas chromatography-mass spectrometry (GC/MS). The samples were extracted with diethyl ether at pH 2, and washed with 0.1 N HCl, and then dried. The dried residue was derivatized in 1 mL of 10% H₂SO₄-MeOH for 2 hr at 80 ℃. The reaction mixture was neutralized with 4 mL of sodium bicarbonate solution and reextracted with 5 mL of diethyl ether. After the extract was concentrated, dicamba was determined by GC/MSSIM mode. There was good linearity above 0.999 in the ranges of the 1.0~100 ㎍/㎏. Total 42 sample including 32 soil samples and 10 plants samples were analyzed by developed method. Dicamba was detected in the concentration range of 2.9-123.9 ㎍/㎏ in 15 samples among 32 soil samples and in the concentration range of 43-33,252 ㎍/㎏ in 5 samples among 10 plants samples. A cause of the wither and die of the pine trees is suspected to spray dicamba around or directly to them.
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KEYWORD
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dicamba, soil, plant, acidic methylation, GC/MS
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