title: Water-soluble sulfonated chromogenic reagents of the ferroin type and determination of iron and copper in water, blood serum, and beer with the tetraammonium salt of 2,4-bis(5,6-diphenyl-1,2,4-triazin-3-yl)pyridinetetrasulfonic acid.
mesh_terms: D001515:Beer / Q000032:analysis; D001557:Benzenesulfonates; D003300:Copper / Q000032:analysis* / Q000097:blood; D007202:Indicators and Reagents; D007501:Iron / Q000032:analysis* / Q000097:blood; D008722:Methods; D000644:Quaternary Ammonium Compounds; D012995:Solubility; D013451:Sulfonic Acids; D014227:Triazines; D014867:Water / Q000032:analysis
chemical_list: D001557:Benzenesulfonates; D007202:Indicators and Reagents; D000644:Quaternary Ammonium Compounds; D013451:Sulfonic Acids; D014227:Triazines; D014867:Water; C012216:2,4-bis(5,6-diphenyl-1,2,4-triazin-3-yl)pyridinetetrasulfonic acid; D003300:Copper; D007501:Iron