Hach DR2400 - Page 415

Nickel
Nickel
Nickel_PP_Other_PAN_Eng_Ody.fm Page 5 of 6
Summary of Method
After buffering the sample and masking any Fe
3+
with pyrophosphate, the
nickel is reacted with 1-(2-Pyridylazo)-2-Naphthol indicator. The indicator forms
complexes with most metals present. After color development, EDTA is added to
destroy all metal-PAN complexes except nickel and cobalt. The instrument
automatically adjusts for cobalt interference by measuring the absorbance of the
sample at both 560 nm and 620 nm. This method is unique because both nickel
and cobalt can be determined on the same sample.
Required Reagents
Quantity Required
Description per test Unit Cat. No.
Nickel Reagent Set (100 Tests) .......................................................................................................................26516-00
Includes:
(2) EDTA Reagent Powder Pillows..................................................2 pillows......... 100/pkg...............7005-99
(2) Phthalate-Phosphate Reagent Powder Pillows........................2 pillows......... 100/pkg.............26151-99
(1) PAN Indicator Solution, 0.3%.....................................................1 mL ................ 100 mL MDB.....21502-32
Water, deionized .......................................................................................25 mL .............. 4 liters....................272-56
Required Apparatus
Sample Cells, 10-mL, w/cap...................................................................2 ....................... 6/pkg.................24276-06
Required Standards
Nickel Standard Solution, 1000-mg/L Ni (NIST) .......................................................... 100 mL...............14176-42
Nickel Standard Solution, 50-mg/L Ni (NIST), 10-mL Ampules................................ 16/pkg...............25576-10