Hach DR2400 Manual page 244

Cobalt
Method Performance
Summary of Method
Required Reagents
Description
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
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Precision
Standard: 1.00 mg/L Co
Program
110
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
Portion of Curve
Entire range
See Section 3.4.5 Sensitivity on page 44 for more information.
After buffering the sample and masking any Fe
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.
Call toll-free 800-227-4224
Contact the HACH office or distributor serving you.
www.hach.com ; E-mail – techhelp@hach.com
95% Confidence Limits of Distribution
0.98–1.02 mg/L Co
∆Abs
0.010
3+
with pyrophosphate, the
Quantity Required
per test
∆Concentration
0.01 mg/L Co
Unit Cat. No.
HACH COMPANY
WORLD HEADQUARTERS
Telephone: (970) 669-3050
FAX: (970) 669-2932
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Cobalt_PP_Other_PAN_Eng_Ody.fm