p-Nitro-N-propylaniline/silica: synthesis, characterization, and its application in matrix solid phase dispersion for multiresidue analysis of pesticides in carrots.
A new material for matrix solid phase dispersion (MSPD) was synthesized -- p-nitro-N-propylaniline/silica (pNNPASi) by grafting reactions, characterized by elemental analysis and N(2)-adsorption-desorption isotherms, and tested for multiclass multiresidue analysis of pesticides in wet and freeze-dried carrots. Results obtained applying this new solid phase sorbent to MSPD extraction of ten pesticides (trichlorphon, trifluralin, dicloran, chlorothalonil, prometryn, linuron, captan, procymidone, prochloraz, and deltametrin) in wet carrots showed better results than the ones obtained for freeze-dried samples. Recoveries were in the range of 48-106% and precisions varied from 6 to 20% when wet samples were employed. Comparison between pNNPASi sorbent and C(18) showed better performance of pNNPASi for eight out of ten pesticides tested. The LOQs show that the developed method can be used to detect the pesticides investigated in carrots at concentrations below the maximum residue levels (MRL) established by EU, USEPA, and National Sanitary Surveillance Agency (ANVISA). Linuron, captan, prochloraz, and deltamethrin were found in at least one of the two commercial samples studied in concentrations above the LOQ of this method. Concentrations of the last three pesticides were above the European MRL in one of the commercial samples.
Contieri Abad
Fernanda
F
Laboratório de Química Analítica Ambiental e Oleoquímica, Instituto de Química, UFRGS, Porto Alegre, RS, Brazil.
Winck
Priscila Romero
PR
Benvenutti
Edilson Valmir
EV
do Carmo Ruaro Peralba
Maria
M
Bastos Caramão
Elina
E
Alcaraz Zini
Cláudia
C
D000814:Aniline Compounds / Q000138:chemical synthesis / Q000737:chemistry; D002845:Chromatography / Q000295:instrumentation* / Q000379:methods; D018552:Daucus carota / Q000737:chemistry*; D005504:Food Analysis / Q000379:methods*; D006801:Humans; D008422:Materials Testing; D015394:Molecular Structure; D010575:Pesticides / Q000032:analysis*; D016062:Porosity; D015203:Reproducibility of Results; D012822:Silicon Dioxide / Q000138:chemical synthesis / Q000737:chemistry; D052616:Solid Phase Extraction / Q000379:methods*
D000814:Aniline Compounds; D010575:Pesticides; D012822:Silicon Dioxide