Hach DR/700 Procedures Manual page 474

COPPER,
continued
If the sample is very acidic, adjust to a pH greater than 4 before analysis.
If a turbidity forms and turns black, silver interference is likely. This
can be eliminated by adding 10 drops of saturated Potassium Chloride
Solution to 75 mL of sample, followed by filtration through a fine filter
using the labware listed under Optional Apparatus. Use the filtered
sample in the procedure.
Cyanide interferences prevent sufficient color development but can be
overcome by adding 0.5 mL of formaldehyde to the sample. Wait four
minutes before taking the reading.
SUMMARY OF METHOD
Copper in the sample reacts with a salt of bicinchoninic acid contained
in CuVer 1 or 2 Copper Reagent to form a purple colored complex in
proportion to the copper concentration. This method includes
procedures for both powder pillow and AccuVac reagents.
REQUIRED REAGENTS (Using Powder Pillows)
Description
CuVer 1 Copper Reagent
Powder Pillows, 10 mL . . . 1 pillow . . . . 100/pkg . . . . . . . 21058-69
REQUIRED REAGENTS (Using AccuVac Ampuls)
CuVer 2 Copper Reagent
AccuVac Ampuls . . . . . . . . 1 ampul . . . 25/pkg . . . . . . . . 25040-25
REQUIRED APPARATUS (Using Powder Pillow)
Clippers, for opening
powder pillows . . . . . . . . . 1 . . . . . . . . . each . . . . . . . . . . . . 968-00
DR/700 Filter Module
Number 55.01. . . . . . . . . . . 1 . . . . . . . . . each . . . . . . . . . . 46255-00
REQUIRED APPARATUS (Using AccuVac Ampuls)
Adapter, AccuVac vial . . . . . . 1 . . . . . . . . . each . . . . . . . . . . 46025-00
Beaker, 50 mL . . . . . . . . . . . . 1 . . . . . . . . . each . . . . . . . . . . . . 500-41
DR/700 Filter Module
Number 55.01. . . . . . . . . . . 1 . . . . . . . . . each . . . . . . . . . . 46255-00
Quantity
Per Test Unit
55-26
Cat. No.