公开(公告)号：US20200340925A1

公开(公告)日：2020-10-29

申请号：US16648669

申请日：2018-08-09

申请人： HACH LANGE GMBH

发明人： ANDREAS GOLITZ ,  ANDREAS JONAK ,  MICHAEL KUSSMANN ,  AXEL LEVER ,  ANDREAS SCHWENK ,  MARKUS HAHN

IPC分类号： G01N21/78 ,  G01N31/22

摘要： A method for determining a phosphate concentration in a water sample includes providing the water sample, adding a first acid to the water sample to obtain a second water sample in which a concentration of the first acid is at least 0.5 wt.-%, performing a first photometric measurement of the second water sample, adding a coloring component to the second water sample to obtain a third water sample, performing a second photometric measurement of the third water sample, and calculating the phosphate concentration from a difference between the first photometric measurement and the second photometric measurement.