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- Title
Determination of Herbicide Residues using LC-MS/MS in Direct Seeded Cultivated Paddy under Drip Irrigation System.
- Authors
Patil, Vinay B.; B. K., Desai; R., Harischandra Naik; B. G., Masthana Reddy; M., Bheemanna
- Abstract
A simple, sensitive and cost effective method is reported for the analysis of herbicides by LC-MS/MS with positive spray ionization technique. The limit iof quantification (LOQ) was 0.001 mg kg-1 for pretilachlor and pyrazosulfuron ethyl, 0.002 mg kg-1 for pendimethalin and 0.003 mg kg-1 for bispyribac sodium The calibration curve for each herbicide was linear over the concentration range of 0.01 to 0.1 µg mL-1 and coefficient of determination (R2) was 0.999. Sample extraction was done following the modified QuEChERS technique which recorded recovery within acceptable range of 70-120 per cent for all the herbicides. Residual analysis of the four herbicides following application of pendimethalin, pretilachlor and pyrazosulfuron ethyl (pre-emergent) and bispyribac sodium (post-emergent) in field samples revealed no significant difference between surface drip irrigation and sub-surface drip irrigation systems. Among the treatments, pyrazosulfuron ethyl 10 per cent WP applied at 20 g a.i ha-1 followed by bispyribac sodium 10 per cent SL at 25 g a.i ha-1 recorded the residue of pyrazosulfuron ethyl only in surface and sub-surface drip systems, respectively during 2016 and 2017. Pendimethalin 38.7 per cent CS recorded residues below detectable level; whereas pretilachlor 50 per cent EC applied at 1.0 kg a.i ha-1 did not record any residues in surface and sub-surface drip irrigation systems.
- Subjects
HERBICIDE residues; LIQUID chromatography-mass spectrometry; MICROIRRIGATION; BISPYRIBAC-sodium; PENDIMETHALIN
- Publication
Pesticide Research Journal (09706763), 2021, Vol 33, Issue 1, p57
- ISSN
0970-6763
- Publication type
Article
- DOI
10.5958/2249-524X.2021.00020.0