p-Nitro-N-propylaniline/silica: Synthesis, characterization, and its application in matrix solid phase dispersion for multiresidue analysis of pesticides in carrots
✍ Scribed by Fernanda Contieri Abad; Priscila Romero Winck; Edilson Valmir Benvenutti; Maria do Carmo Ruaro Peralba; Elina Bastos Caramão; Cláudia Alcaraz Zini
- Publisher
- John Wiley and Sons
- Year
- 2007
- Tongue
- English
- Weight
- 696 KB
- Volume
- 30
- Category
- Article
- ISSN
- 1615-9306
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✦ Synopsis
Abstract
A new material for matrix solid phase dispersion (MSPD) was synthesized – p‐nitro‐N‐propylaniline/silica (__p__NNPASi) 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 __p__NNPASi sorbent and C~18~ showed better performance of __p__NNPASi 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.