Table 2.

Elution times and mass-to-charge ratios of peaks identified by the statistical evaluation as positive findings, and their attribution to spiked compounds or unknown (false positive)

Compound	Elution time	m/z assigned
		[M+H]+	No. of additional isotopes and fragments	Adducts
Mycotoxins (0.4 μg mL−1)
Aflatoxin G2	5.76	331.0815	1	[M+Na]+
Aflatoxin G1	6.09	329.0646	1
Aflatoxin B2	6.44	315.0861	1	[M+Na]+
Aflatoxin B1	6.78	313.0708	1
Diacetoxyscirpenol	6.86		[M+Na]+ at 389.1561, [M+K]+ [M+NH4]+
T2 toxin	9.00	489.2099	0
Sterigmatocystin	10.27	325.0709	1	[M+Na]+
False-positive peak	14.71	315.2301	0
Pharmaceutical (100 μg mL−1)
Column bleed artefact	4.72	226.9516	0
Sulfadoxin	4.78	311.0844	10	[M+Na]+ [M+K]+ [M+2H]2+
Pesticides (2.5 μg mL−1)
Acephate	3.12	184.0190	3	[M+Na]+
Omethoate	3.35	214.0303	4	[M+Na–H2O]+
Impurity	4.40	272.0716	1
Dimethoate	5.28	230.0069	8
Paraoxonmethyl	6.39	248.0323	2	[M+Na]+
Dichlorvos	7.02	220.9536	3
Fenthion-sulfone	7.59	311.0170	4	[M+NH4]+ [M+Na]+
Atrazine	8.19	216.1015	4
Metalaxyl	8.23	280.1586	6	[M+Na]+
Methidathion	8.74	302.9687	3
Impurity	9.46	279.0270	0
Triadimefon	9.71	294.1004	1	[M+Na]+
Fenarimol	10.16		Isotopes at 333.0366 and 335.035 were detected
Tebuconazole	10.89		[M+Na]+ were detected at 330.1344 and 331.1370
Chlorfenvinfos	10.97	358.9770	12	[M+Na]+
Diazinon	11.02	305.1092	2
Fenthion	11.03	279.0282	2	[M+Na]+ [M+K]+
Propiconazol	11.07	342.0771	3	[M+Na]+
Prochloraz	11.23	376.0379	9	[M+Na]+
Impurity	11.28	362.9714	0
Ethion	12.44	384.9952	10	[M+Na]+ [M+K]+

m/z ratios are given for the main ion of each peak; other isotopes and fragments are only reported in number. Inspection of the raw data revealed additional peaks in some cases, but these are not included in the table