Fig. 4From: A LC-MS/MS method with electrospray ionization and atmospheric pressure chemical ionization source for analysis of pesticides in hempEffect of mobile phase composition on PCNB (a) and superoxide ion response (b). Both superoxide ion (O2−) and PCNB signal increased roughly by a factor of 300 and 30, respectively, when we changed the mobile phase from a mixture of methanol and water with 0.1% formic acid and 2 mM ammonium formate to a mixture of methanol and water. Mobile phase 1: methanol and water with 0.1% formic acid and 2 mM ammonium formate. Mobile phase 2: methanol and waterBack to article page