Hach DR2400 - Page 474

Nitrogen, Ammonia
© Hach Company, 2003. All rights reserved. Printed in the U.S.A. 3/04 1ed
Page 4 of 4 NitrogenAmm_PP_Other_SAL_Eng_Ody.fm
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Method Performance
Precision
Standard: 0.30 mg/L NH
3
–N
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
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.
Required Reagents
Quantity Required
Description Per Test Unit Cat. No.
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
3
–N ...................................... 500 mL...................153-49
Ammonia Nitrogen Standard, 2-mL PourRite
®
Ampule, 50-mg/L as NH
3
–N........ 20/pkg...............14791-20
Water, deionized ................................................................................................................. 4 liters ....................272-56
Program 95% Confidence Limits of Distribution
385 0.25–0.35mg/L NH
3
–N
Portion of Curve ∆Abs ∆Concentration
Entire range 0.010 0.004 mg/L NH
3
–N