Matrix solid-phase dispersion microextraction and determination of pesticide residues in medicinal herbs by gas chromatography with a nitrogen-phosphorus detector.
A gas chromatography method for the determination of residues of 6 pesticides in Isatis indigotica Fort and Paeonia lactiflora Pall is described. Optimizations of different parameters were performed. The method used 0.5 g herb sample, silica gel as the matrix solid-phase dispersion sorbent, and acetone as the eluting solvent. Recoveries at spiked concentrations between 0.1 and 5 mg/kg were between 80.63 and 110.12%, with relative standard deviations ranging from 0.43 to 17.67%. The limits of quantitation were 0.01 mg/kg for metalaxyl, triadimefon, and paclobutrazol and 0.05 mg/kg for vinclozolin, tebuconazole, and fenarimol. The method may be useful as a screening protocol for the determination of these pesticides in medicinal herb samples.
Tang
Feng
F
Anhui Agricultural University, College of Resources and Environment, Hefei, Anhui 230036, People's Republic of China.
Yue
Yongde
Y
Hua
Rimao
R
Cao
Haiqun
H
D002849:Chromatography, Gas; D007202:Indicators and Reagents; D031219:Isatis / Q000737:chemistry; D009584:Nitrogen / Q000737:chemistry; D029596:Paeonia / Q000737:chemistry; D010573:Pesticide Residues / Q000032:analysis*; D010758:Phosphorus / Q000737:chemistry; D010946:Plants, Medicinal / Q000737:chemistry*; D012015:Reference Standards; D012997:Solvents
D007202:Indicators and Reagents; D010573:Pesticide Residues; D012997:Solvents; D010758:Phosphorus; D009584:Nitrogen