Diuron, N-(3,4-dichlorophenyl)-N, N-dimethylurea can be transformed into the soil through the biodegradation of 3-(3,4-dichlorophenyl)-3-methylurea (DCPMU), 3.4-diclorofenilureia (DCPU) and 3,4-dichloroaniline (DCA).This study aimed to optimize and validate a method of extraction and analysis of these substances in the soil by HPLC/DAD.
There was extracted with methanol in the bath ultrasonic and analysis in a liquid chromatograph/detector brand Waters.The condition of analysis optimized for separation of analytes was mobile phase methanol: water 50:50 (v / v), flow 1 mL min-1.Wavelength of 240 nm was selected for the DCA and 254 nm for diuron, DCPMU and DCPU.
It was used column and pre column Waters Membrane Xterra RP18, 5 um, 4.6 and 3.9 x 150 mm x 20 mm.
The calibration curve was obtained from the fortification of the soil with the mixture of patterns in the range of 5 mg Kg-1 to 200 mg Kg-1 of soil.The recovery was obtained in two concentration levels of 5 and 200 mg.Kg-1 of soil was between 85 and 99%.
The Male Bullet Terminals repeatability was 0.78%, 2.20%, 2.
17% and 1.72% and intermediate precision was 2.48%, 2.
11%, 3.10% and 2.77% for diuron, DCPMU, DCPU and DCA, respectively.
The limit of quantification was 1.25 mg Kg-1 soil.The concentration of diuron found in some bioaugmented soil samples ranged from 5.
5 to 8.9 mg Kg-1 soil, but was not detected the presence of their metabolites.