Journal
JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH PART B-PESTICIDES FOOD CONTAMINANTS AND AGRICULTURAL WASTES
Volume 54, Issue 3, Pages 205-210Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/03601234.2018.1550306
Keywords
Glyphosate; herbicide; pesticide residue; maize; rice; cereals; LC; MS; MS
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A fast and easy method was developed for the determination of glyphosate in maize and rice by using liquid chromatography triple quadrupole mass spectrometry with a Dionex Ion Pack column and phosphate buffer mobile phase. Samples were extracted with an acidified methanol solution. An isotope-labeled internal standard was added to the sample before extraction to ensure accurate tracking and quantification. The method's performance was evaluated through a series of assessments to determine the accuracy, precision, linearity, matrix effect, limit of detection (LOD), and limit of quantification (LOQ). The mean recoveries for both matrices were within 70-105% at three fortification levels, including the LOQ. The precision for replicates was <20% (RSD%) for both matrices. Good linearity (R-2=0.9982) was obtained over the concentration range of 0.01-1.5 mg kg(-)(1). The LOD was determined to be 0.002 mg kg(-)(1) for rice and 0.004 mg kg(-)(1) for maize. The LOQ was 0.01 mg kg(-)(1) for both maize and rice. Due to its versatility, the proposed method could be considered useful for the determination of glyphosate in cereals in routine analysis.
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