Table 1.

Parameters of the MS/MS and ion source conditions.

Analyte	Precursor Ion [M + H]+ [m/z]	Product Ions [m/z]	Collision Energy [V]	Q1 Prerod [V]	Q3 Prerod [V]
NNK	208.00	79.10 1	−26	−40	−29
		148.20	−11	−12	−13
NNN	178.10	120.10 1	−14	−19	−25
		148.20	−21	−13	−30
NAT	190.00	79.10 1	−14	−29	−13
		160.20	−14	−11	−16
NAB	192.10	162.20 1	−10	−14	−29
		133.20	−14	−19	−29
NNK-d4	212.20	126.20 1	−10	−12	−22
		152.15	−10	−13	−30
NNN-d4	182.20	152.20 1	−14	−12	−14
		122.10	−12	−29	−12
NAT-d4	194.20	164.20 1	−20	−12	−16
		110.20	−10	−17	−23
NAB-d4	196.20	166.20 1	−14	−13	−30
		137.20	−19	−23	−23

¹ quantification ion.