期刊
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
卷 59, 期 22, 页码 11918-11926出版社
AMER CHEMICAL SOC
DOI: 10.1021/jf202878s
关键词
pesticides; rice paddy soils; QuEChERS; liquid chromatography; atmospheric pressure chemical ionization
资金
- FINEP
- CNPQ
- FAPERGS
- CAPES
- Instituto Riograndense do Arroz Irrigado (IRGA)
A new method for the determination of clomazone, fipronil, tebuconazole, propiconazole, and azoxystrobin in samples of rice paddy soil is presented. The extraction of the pesticides from soil samples was performed by using a modified quick, easy, cheap, effective, rugged, and safe (QuEChERS) method. Some extraction conditions such as salt addition, sample acidification, use of buffer, and cleanup step were evaluated. The optimized method dealt with a single extraction of the compounds under study with acidified acetonitrile, followed by the addition of MgSO(4) and NaCl prior to the final determination by liquid chromatography atmospheric chemical pressure ionization tandem mass spectrometry. Validation studies were carried out in soil samples. Recoveries of the spiked samples ranged between 70.3 and 120% with relative standard deviation lower than 18.2%. The limits of quantification were between 10 and 50 mu g kg(-1). The method was applied to the analysis of real samples of soils where rice is cultivated.
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