Routine determination of sulfonylurea, imidazolinone, and sulfonamide herbicides at nanogram-per-liter concentrations by solid-phase extraction and liquid chromatography/mass spectrometry

MEKC combined with SPE and sample stacking for multiple analysis of pesticides in water samples at the ng/L level

“…Moreover, the good solubility in water as well as the relatively slow degradation rates of many of these pesticides intensifies their influence on the environment. As a result, pesticides with different chemical structures can be found in environmental waters [1,20,21] and rapid and sensitive methods are required for their routine analysis in this type of samples.…”

Optimization Method for Simultaneous Extraction and Detection of Imazapic and Imazapyr Herbicides in Soil and Water Using HPLC-UV with Verification of LC-MS

“…These peaks correspond to the molecular mass of imazapyr and imazapic as portrayed in Figure 1 as well as Table 1. Furlong et al (2000), Laganà et al (1998) and Rodriguez and Orescan (1998) reported similar results of m/z 262 for the imazapyr compound using LC-MS. Previous studies carried out using LC-MS also supported the finding of the present study whereby the m/z of 276 was obtained for the imazapic compound Pareja et al 2011).…”

Analytical Methods for Polar Pollutants

“…As for many other basic analytes RPLC with a formic acid ammonium formate buffer ESI in positive ion mode has been used to determine 16 of these analytes in surface and groundwater [173].…”

“…However, this selectivity weakens our awareness that the target analyte is only an extreme minority of the whole amount of sample injected onto the analytical column. This so-called matrix may affect the ionization of the analytes of interest and may result in an erroneous quantitation by LC-MS. A typical problem is coextracted humic material in the trace analysis of acidic pesticides from ground-and surface waters [147,173,[217][218][219]. But in general, any coeluting organic compound can interfere with the ionization of a target analyte [220][221][222].…”