Simultaneous determination of organophosphorus and organonitrogen pesticides residues inAngelica sinensis

2010 ◽  
Vol 45 (4) ◽  
pp. 315-324 ◽  
Author(s):  
Yi Q. Wan ◽  
Xue J. Mao ◽  
Ai P. Yan
Keyword(s):  
Simultaneous Determination ◽  
Pesticides Residues ◽  
Organonitrogen Pesticides

Simultaneous determination of five pesticides residues in Anoectochilus roxburghii by HPLC-MS/MS method

2020 ◽  
Vol 20 (5) ◽  
pp. 345-349
Author(s):  
Liqun WU ◽  
◽  
Mingke LUO ◽  
Wensheng HE ◽  
Wenting CHEN
Keyword(s):  
Simultaneous Determination ◽  
Multiple Reaction Monitoring ◽  
Gradient Elution ◽  
Acetonitrile Solution ◽  
Ionization Source ◽  
Thiophanate Methyl ◽  
Pesticides Residues ◽  
Relative Standard ◽  
Anoectochilus Roxburghii

Objective： To establish a HPLC-MS/MS method for simultaneous determination of five pesticides residues including tebuconazole，metalaxyl-M，thiophanate-methyl，oxytetracycline and abamectin in Anoectochilus roxburghii.Methods： The samples were extracted by acetonitrile solution and purified by QuEChERS method.Separation was performed on Agilent Eclipse Plus C18 column（50 mm×2.1 mm，1.8 μm） with the mobile phase consisting of 0.1% formic acid（A） and acetonitrile（B） by gradient elution（0-1.0 min，90% A；1.0-3.0 min，90%-70% A;3.0-5.0 min，70%-30% A;5.0-8.0 min，30%-10% A;8.0-14.0 min，10% A;14.0-15.0 min，10%-90% A;15.0-17.0 min，90% A）.Detection was performed on a triple quadrupole tandem mass spectrometry with electrospray ionization source operating in positive ion mode under multiple reaction monitoring（MRM） mode.Results： The calibration curves of five pesticides showed good linearity coefficients（r>0.99）.The average recoveries ranged from 72.7% to 94.9%（n=6），and the relative standard derivations（RSDs） were within 1.8%-10.3%（n=6）.The detection limits of tebuconazole，metalaxyl-M，thiophanate-methyl，oxytetracycline and abamectin were 0.6，0.2，0.3，0.2，5.0 μg/kg，and the quantitation limits of 5 pesticides were 2.0，0.5，1.0，0.6 and 10.0 μg/kg respectively.Conclusion： The established method was proved to be sensitive，simple and reliable，and could be applied for the determination of these five pesticides in Anoectochilus roxburghii and quality control in the planting process.

A Sampling and Analytical Method for the Simultaneous Determination of Multiple Organonitrogen Pesticides in Air

AIHAJ ◽  
1997 ◽  
Vol 58 (10) ◽  
pp. 720-725 ◽  
Author(s):  
Eugene R. Kennedy ◽  
Jun-Jie Lin ◽  
John M. Reynolds ◽  
James B. Perkins
Keyword(s):  
Simultaneous Determination ◽  
Analytical Method ◽  
Organonitrogen Pesticides

scholarly journals Comparison for the Simultaneous Determination of Pesticides Residues in Foods by GC and GC/MS

1996 ◽  
Vol 37 (3) ◽  
pp. 158-164_1 ◽  
Author(s):  
Masahiro MIYATA ◽  
Yoshichika HIRAHARA ◽  
Mikako NARITA ◽  
Mika KIMURA ◽  
Yoshinori WATANABE ◽  
...  
Keyword(s):  
Simultaneous Determination ◽  
Pesticides Residues

A general computer program for the extended plate overlap algorithm

1978 ◽  
Vol 48 ◽  
pp. 287-293 ◽  
Author(s):  
Chr. de Vegt ◽  
E. Ebner ◽  
K. von der Heide
Keyword(s):  
Computer Program ◽  
Simultaneous Determination ◽  
General Computer Program ◽  
General Computer

In contrast to the adjustment of single plates a block adjustment is a simultaneous determination of all unknowns associated with many overlapping plates (star positions and plate constants etc. ) by one large adjustment. This plate overlap technique was introduced by Eichhorn and reviewed by Googe et. al. The author now has developed a set of computer programmes which allows the adjustment of any set of contemporaneous overlapping plates. There is in principle no limit for the number of plates, the number of stars, the number of individual plate constants for each plate, and for the overlapping factor.

Sign in / Sign up

Export Citation Format

Share Document