Determination of the fungicides folpet, captan and captafol by cloud-point preconcentration and high-performance liquid chromatography with electrochemical detection

Analytical method for assessing potential dermal exposure to captan, using whole body dosimetry, in small vegetable production units in Argentina

“…Most analytical chromatographic methods involve capillary gas chromatography with electron capture detection7 or mass‐spectrometry detector 8. Alternatively, HPLC methods with electrochemical detection9 and polarographic10 methods have been reported.…”

Cloud point of aqueous solutions containing oxyethylated methyl dodecanoates: effects of surfactant hydrophilicity, nature of added electrolyte, and water activity

“…The technique is now often used as a preliminary preconcentration step prior to liquid chromatography [5][6][7]. Triton-type surfactants are usually used, as they can be easily monitored by a UV detector at 220 nm.…”

Cloud Point Extraction of Pesticide Residues

“…The CPE technique has been successfully exploited for the extraction/preconcentration of pesticides as a sample pretreatment step using a variety of non-ionic surfactants, such as TX 114 prior to their determination by HPLC (Carabias-Martínez et al, 1996;Zhou et al, 2009 a, b), TX-100 (Zhang et al, 2009(Zhang et al, , 2011Chen et al, 2009), polyoxyethylene 10 lauryl ether (POLE) , oligoethylene glycol monoalkyl ether (Genapol X-080) , polyethylene glycol 600 monooleate (PEG600MO) (Tang et al, 2010). A general problem encountered by both zwitterionic and non-ionic surfactants in CPE is that the surfactant-rich phase is too viscous for convenient sampling by a HPLC micro-syringe.…”

“…In www.intechopen.com addition, for the maximum absorption wavelengh of 4-amino-4'-nitrobiphenyl is at 365 nm, Triton X-100 could not interfere with its determination. Simultaneous determination by HPLC with electrochemical detection of Captan, Folpet and Captafol in river water samples has been described by Carabias-Martínez et al (1996). To concentrate the fungicide residues, a CPE step employing the Triton X-114 was applied.…”