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NICKEL, AUTOCATALYTIC,
SAMPLING AND STORAGE
Collect samples in clean plastic or glass bottles. Store at 4 °C (39 °F) or
lower.
ACCURACY CHECK
Standard Solution Method
Check accuracy with a Nickel Standard Solution, 1000 mg/L (1.00 g/L),
listed under Optional Reagents. This is used in place of the sample in
Step 5.
STATISTICAL EVALUATION
A single operator repetitively tested samples of two laboratory prepared
solutions, using one DR/700, matched sample cells and two
representative lots of testing reagents. Testing 2.19 g/L Ni concentration
samples the standard deviation was ±0.019 g/L Ni.
Testing zero concentration samples, the limit of detection was 0.033 g/L
Ni. The limit of detection was calculated as three times the standard
deviation when testing zero concentration samples (Adapted from
Analytical Chemistry, 1980, 52, 2242-2249).
INTERFERENCES
Copper will interfere by giving a similar blue color.
SUMMARY OF METHOD
A strong complexing agent chelates the nickel ions present in an
"electroless" nickel bath to form a blue colored chelate. The blue color
is then measured directly to give the g/L nickel present in the bath.
REQUIRED REAGENTS
Description
Potassium 1 Reagent
Powder Pillows. . . . . . . . . . 1 pillow . . . . 25/pkg . . . . . . . . 14321-98
Water, demineralized . . . . . . . . 10 mL . . . . . 4 L . . . . . . . . . . . . . 272-56
REQUIRED APPARATUS
Clippers, for opening
powder pillows . . . . . . . . . . 1 . . . . . . . . . each . . . . . . . . . . . . 968-00
DR/700 Filter Module
Number 57.01. . . . . . . . . . . 1 . . . . . . . . . each . . . . . . . . . . 46257-00
continued
Quantity
Per Test
Unit
57-25
Cat. No.
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