Analytical Chem istry - DePauw University

576 Analytical Chemistry 2.0Table 10.6 Examples of the Molecular UV/Vis Analysis of Waters andWastewatersAnalyte Method l (nm)Trace Metalsaluminumreact with Eriochrome cyanide R dye at pH 6; forms red topink complex535arsenicreduce to AsH 3 using Zn and react with silver diethyldithiocarbamate;forms red complex535cadmiumextract into CHCl 3 containing dithizone from a samplemade basic with NaOH; forms pink to red complex518chromiumoxidize to Cr(VI) and react with diphenylcarbazide; formsred-violet product540copperreact with neocuprine in neutral to slightly acid solutionand extract into CHCl 3 /CH 3 OH; forms yellow complex457ironreduce to Fe 2+ and react with o-phenanthroline; formsorange-red complex510extract into CHCl 3 containing dithizone from sampleleadmade basic with NH 3 /NH + 4 buffer; forms cherry red 510complexmanganese oxidize to MnO – 4 with persulfate; forms purple solution 525mercuryextract into CHCl 3 containing dithizone from acidicsample; forms orange complex492zinc react with zincon at pH 9; forms blue complex 620Inorganic Nonmetalsammoniareaction with hypochlorite and phenol using a manganoussalt catalyst; forms blue indophenol as product630cyanidereact with chloroamine-T to form CNCl and then with apyridine-barbituric acid; forms a red-blue dye578fluoridereact with red Zr-SPADNS lake; formation of ZrF 2– 6 decreasescolor of the red lake570chlorine (residual) react with leuco crystal violet; forms blue product 592nitratereact with Cd to form NO – 2 and then react with sulfanilamideand N-(1-napthyl)-ethylenediamine; forms red azo 543dyephosphatereact with ammonium molybdate and then reduce withSnCl 2 ; forms molybdenum blue690Organicsphenolreact with 4-aminoantipyrine and K 3 Fe(CN) 6 ; forms yellowantipyrine dye460anionic surfactantreact with cationic methylene blue dye and extract intoCHCl 3 ; forms blue ion pair652