This standard specifies a method for determining the following plant treatment agents in drinking water, ground water and surface water in mass concentrations of ≥ 0,025 µg: Chlopyralid; DNOC; MCPA; Mecoprop; Mecoprop-P; 2,4-D; Dicamba; Quinmerac; MCBP; Dichloroprop; Dichloroprop-P; Dinoterb; Bentazone; 2,4-DB; Fluroxypyr; 2,4,5-T; Bromoxynyl; Fluazifop, Fluazifop-P, Sulcotrion; Fenoxaprop; Fenoxaprop-P; Mesotrion; Haloxyfop; Haloxifop-P; Ioxynil; Nicosulfuron. The applicability to other connections and other types of water shall be examined in each individual case. Detection is performed by tandem MS. Other MS detection modes are possible, for instance Time of Flight (TOF). The standard has been prepared by Working Committee NA 119-01-03-02-16 AK "LC-MS/MS-Verfahren" ("LC-MS/MS method") of Working Committee NA 119-01-03 AA "Wasseruntersuchung" ("Water Analysis") at NAW. The project has been funded by Länderfinanzierungsprogramm "Wasser, Boden und Abfall" (federal funding programme "Water, soil and waste").