Keywords: پنتا فلوئوروبنسییل هیدروکسیلامین; Organohalogen; By-products; Water; Analysis; Characterization; AOX; Adsorbable organic halide; APCI; Atmospheric pressure chemical ionization; APPI; Atmospheric pressure photoionization; BSTFA; N,O-bis(trimethylsilyl)trifluoroacetamide; CID; Collision ind