Sulphate radical generation through interaction of peroxymonosulphate with Co(II) for in-line sample preparation aiming at spectrophotometric flow-based determination of phosphate and phosphite in fertilizers - Crispino, Carla Cripa; Kamogawa, Marcos Yassuo; Ferreira, José Roberto; Zagatto, Elias Ayres Guidetti (Talanta, 2016)