Hach DR2400 Manual page 474

Nitrogen, Ammonia
Method Performance
Summary of Method
Required Reagents
Description
Ammonia Nitrogen Reagent Set, for 10-mL samples (100 tests) ..............................................................26680-00
Includes:
(2) Ammonia Cyanurate Reagent Powder Pillows ....................... 2 ....................... 100/pkg.............26531-99
(2) Ammonia Salicylate Reagent Powder Pillows......................... 2 ....................... 100/pkg.............26532-99
Required Apparatus
Sample Cells, 10-mL, w/cap................................................................... 2 ....................... 6/pkg.................24276-06
Required Standards
Ammonia Nitrogen Standard Solution, 10-mg/L as NH
Ammonia Nitrogen Standard, 2-mL PourRite
Water, deionized ................................................................................................................. 4 liters ....................272-56
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Page 4 of 4
Precision
Standard: 0.30 mg/L NH
Program
385
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.
Ammonia compounds combine with chlorine to form monochloramine.
Monochloramine reacts with salicylate to form 5-aminosalicylate. The
5-aminosalicylate is oxidized in the presence of a sodium nitroprusside catalyst
to form a blue-colored compound. The blue color is masked by the yellow color
from the excess reagent present to give a final green-colored solution. Test results
are measured at 655 nm.
®
Ampule, 50-mg/L as NH
Call toll-free 800-227-4224
Contact the HACH office or distributor serving you.
www.hach.com ; E-mail – techhelp@hach.com
–N
3
95% Confidence Limits of Distribution
0.25–0.35mg/L NH
∆Abs
0.010
Quantity Required
Per Test
–N ...................................... 500 mL...................153-49
3
–N ........ 20/pkg...............14791-20
3
–N
3
∆Concentration
0.004 mg/L NH –N
3
Unit Cat. No.
HACH COMPANY
WORLD HEADQUARTERS
Telephone: (970) 669-3050
FAX: (970) 669-2932
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NitrogenAmm_PP_Other_SAL_Eng_Ody.fm