| Autor: |
Caixeta-Neta A; Chemistry Institute, Federal University of Catalão, 75704-020 Catalão, GO, Brazil. ls_andrade@ufg.br., Ribeiro GC, De Amorim KP, Andrade LS |
| Jazyk: |
angličtina |
| Zdroj: |
Analytical methods : advancing methods and applications [Anal Methods] 2020 Dec 23; Vol. 12 (48), pp. 5823-5832. |
| DOI: |
10.1039/d0ay01918f |
| Abstrakt: |
A procedure for electroanalytical determination of the fungicide TBZ extracted and preconcentrated from tomatoes by the cloud-point extraction (CPE) technique was developed and validated in this work. The analytical technique used for this determination was HPLC coupled to an electrochemical detector (HPLC/EC), with a BDD electrode. The main variables of the CPE process were evaluated using a 24 full factorial design. The optimal condition of CPE was achieved by using Tergitol (19% v/v), NaCl (0.83 g), ultrasonic stirring time of 15 min and a temperature of 36 °C. Under these conditions, the preconcentration factor obtained was 5.7. The limits of detection (LOD) and quantification (LOQ) were 2.7 × 10-8 mol L-1 (or 5.4 μg L-1) and 5.5 × 10-8 mol L-1 (or 11 μg L-1), respectively. The average recovery values varied from 80.7% to 115.1% and the precision (average of 3 days) was less than 15%, indicating the good accuracy and precision of the method developed here. Upon applying the method to examine commercial tomatoes, TBZ was detected in one of the three analyzed samples. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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