Multiresidue Pesticides Analysis of Vegetables in Vietnam by Ultrahigh-Performance Liquid Chromatography in Combination with High-Resolution Mass Spectrometry (UPLC-Orbitrap MS)

Table 2

Mass and mass accuracy of three representative pesticides in the standard solution and in the matrix-match solution.

No	Analytes	Chemical formula	Theoretical mass (Da, m/z)	Standard solution		Matrix-match solution
				Experimental mass (Da), mean value,	Mass accuracy (ppm)	Experimental mass (Da), mean value,	Mass accuracy (ppm)
1	Carbofuran	C12H14NO3	222.1125	222.1122	−1.4	222.1120	−1.8
2	Azoxystrobin	C22H17N3O5	404.1241	404.1234	−2.0	404.1231	−2.2
3	Pyridaben	C19H25ClN2OS	365.1449	365.1443	−1.6	365.1441	−2.5

Theoretical mass was calculated through online enviPAT software (https://www.envipat.eawag.ch/).