Hach DR2400 - Page 793

Zinc
Zinc
Zinc_PP_Other_ZNC_Eng_Ody.fm Page 5 of 6
Summary of Method
Zinc and other metals in the sample are complexed with cyanide. Adding
cyclohexanone causes a selective release of zinc. The zinc then reacts with
2-carboxy-2'-hydroxy-5'-sulfoformazyl benzene (zincon) indicator to form a
blue-colored species. The blue color is masked by the brown color from the
excess indicator. The intensity of the blue color is proportional to the amount of
zinc present. Test results are measured at 620 nm.
Required Reagents
Quantity Required
Description Per Test Unit Cat. No.
Zinc Reagent Set, 20-mL sample size
(100 tests = 100 samples + 100 blanks)..........................................................................................................24293-00
Includes:
Cyclohexanone ...................................................................................1 mL ................ 100 mL MDB.....14033-32
ZincoVer
®
5 Reagent Powder Pillows.............................................1 pillow........... 100/pkg.............21066-69
Required Apparatus
Cylinder, graduated, mixing, 25-mL......................................................1 ....................... each....................20886-40
Sample Cells, 10-20-25 mL, w/cap.........................................................2....................... 6/pkg.................24019-06
Required Standards
Water, deionized ................................................................................................................. 4 L ..........................272-56
Zinc Standard Solution, 100-mg/L .................................................................................. 100 mL.................2378-42
Zinc Standard Solution, 2-mL PourRite
®
Ampule, 25-mg/L as Zn............................ 20/pkg...............14246-20
Zinc Standard Solution, 10-mL Voluette
®
Ampule, 25-mg/L as Zn........................... 16/pkg...............14246-10