Cobalt
© Hach Company, 2003. All rights reserved. Printed in the U.S.A. 3/04 1ed
Page 4 of 4 Cobalt_PP_Other_PAN_Eng_Ody.fm
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Method Performance
Precision
Standard: 1.00 mg/L Co
See Section 3.4.3 Precision on page 44 for more information, or if the standard
concentration did not fall within the specified range.
Sensitivity
See Section 3.4.5 Sensitivity on page 44 for more information.
Summary of Method
After buffering the sample and masking any Fe
3+
with pyrophosphate, the
cobalt 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, which can both be
determined using the same sample. Test results are measured at 620 nm.
Required Reagents
Quantity Required
Description per test Unit Cat. No.
Cobalt Reagent Set, 10-mL (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...............21502-32
Water, deionized.................................................................................25 mL .............. 4 liters ....................272-56
Required Apparatus
Cylinder, graduated mixing, 25-mL.......................................................2 ....................... each....................20886-40
Sample Cells, 10-mL, w/cap...................................................................2 ....................... 6/pkg.................24276-06
Required Standards
Cobalt Standard Solution, 1000-mg/L Co ...................................................................... 100 mL...............21503-42
Program 95% Confidence Limits of Distribution
110 0.98–1.02 mg/L Co
Portion of Curve ∆Abs ∆Concentration
Entire range 0.010 0.01 mg/L Co
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