Hach DR/850, Procedures Manual, Page: 451 / 460

451
Summary of Method
Zinc and other metals in the sample complex with cyanide.
Adding cyclohexanone selectively releases zinc. The zinc then
reacts with the
2-carboxy-2’-hydroxy-5’-sulfoforamazyl benzene (zincon)
indicator and forms a blue color that is proportional to the zinc
concentration.
REQUIRED REAGENTS
Zinc Reagent Set, 20 mL size (100 tests)......................................................................24293-00
Includes: (1) 14033-32, (1) 21066-69
Quantity Required
Description Per Test Units Cat. No.
Cyclohexanone ......................................................... 0.5 mL ...... 100 mL MDB ..........14033-32
ZincoVer 5 Reagent Powder Pillows....................... 1 pillow................100/pkg ..........21066-69
REQUIRED APPARATUS
Pipet, serological, 10 mL...............................................1 ...........................each ..............532-38
Pipet Filler, safety bulb .................................................1 ...........................each ..........14651-00
Sample Cell, 10-20-25 mL, w/cap ................................2 .........................6/pkg ..........24019-06
Squeezers, plastic dropper.............................................1 .......................20/pkg ..........21247-20
OPTIONAL REAGENTS
Bleach, household ...................................................................................... 1 gal ....... buy locally
Cylinder, graduated, mixing, 25mL ............................................................each ..........20886-40
Hydrochloric Acid Standard Solution, 6 N ........................................... 500 mL ..............884-49
Nitric Acid, ACS ................................................................................... 500 mL ..............152-49
Nitric Acid 1:1....................................................................................... 500 mL ............2540-49
Sodium Hydroxide Standard Solution, 5.0 N............................... 50 mL SCDB ............2450-26
Water, deionized ........................................................................................... 4 L ..............272-56
Zinc Standard Solution, 100 mg/L Zn................................................... 100 mL ............2378-42
Zinc Standard Solution, PourRite ampule, 25 mg/L as Zn, 2mL............20/pkg ..........14246-20
OPTIONAL APPARATUS
Ampule Breaker, PourRite ampules ............................................................each ..........24846-00
Aspirator, vacuum .......................................................................................each ............2131-00
Beaker, glass, 1000 mL ...............................................................................each ..............500-53
Cylinder, graduated, 100 mL.......................................................................each ..............508-42
Cylinder, graduated, mixing, 250 mL .........................................................each ..........26362-46
Filter discs, glass, 47 mm ......................................................................100/pkg ............2530-00
Filter holder, 47 mm ....................................................................................each ............2340-00
Flask, erlenmeyer, 250 mL..........................................................................each ..............505-46
Flask, filtering, 500 mL...............................................................................each ..............546-19
ZINC,
continued