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Development and validation of a method of analysis of glyphosate in soy grains

机译:大豆谷物中草甘膦分析方法的开发和验证

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The main objective of this work is to develop an efficient procedure to determine glyphosate in soybean grains. The cleanup of the aqueous extracts was done in two steps, beginning with liquid-liquid partitioning and then solid-phase extraction with anion exchange resin. After derivatization with a mixture of trifluoroacetic anhydride (TFAA) and trifluoroethanol (TFE), quantification was done by gas chromatography coupled to mass spectrometry. The mean recovery and RSD of the spiked samples were, respectively, 80.5% and 3.1% at level 0.200 mg kg-1, 93.3% and 18.7% at level 0.500 mg kg-1 and 92% and 3.5% at level 1.000 mg kg-1. The method was linear in the working range (correlation coefficient = 0.9965).
机译:这项工作的主要目的是开发一种测定大豆谷物中草甘膦的有效方法。水提取物的净化分两个步骤进行,首先是液-液分配,然后是用阴离子交换树脂进行固相萃取。用三氟乙酸酐(TFAA)和三氟乙醇(TFE)的混合物衍生化后,通过气相色谱-质谱联用进行定量。加标样品的平均回收率和RSD在0.200 mg kg-1时分别为80.5%和3.1%,在0.500 mg kg-1时为93.3%和18.7%,在1.000 mg kg-1时为92%和3.5%。 1。该方法在工作范围内是线性的(相关系数= 0.9965)。

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