Hach DR2400 - Page 494

Nitrogen, Ammonium
© Hach Company, 2003. All rights reserved. Printed in the U.S.A. 3/04 1ed
Page 4 of 4 NitrogenAmm_UniCell_Low_SAL_Eng_Ody.fm
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Method Performance
Precision
Standard: 1.00 mg/L NH
4
+
–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
Ammonium ions react with hypochlorite ions and salicylate ions at pH 12.6 in
the presence of sodium nitroferricyanide to form indophenol blue. Test results
are measured at 694 nm.
Required Reagents
Description Unit Cat. No.
Ammonium - NH
4
, UniCell™ HCT 100.......................................................................... 23/pkg.............. HCT 100
Optional Reagents
Ammonium Standard Solution, 100-mg/L as NH
3
–N ................................................. 500 mL...............24065-49
Nitrogen Ammonia Standard, 1-mg/L as NH
3
–N........................................................ 500 mL.................1891-49
Sodium Hydroxide Standard Solution, 5.0 N................................................................. 50 mL SCDB .......2450-26
Sulfuric Acid, ACS.............................................................................................................. 500 mL...................979-49
Required Apparatus
Adapter, 16-mm Cell .......................................................................................................... each....................59457-00
Optional Apparatus
Cylinder, mixing, 100-mL.................................................................................................. each....................20886-42
Flask, volumetric, 1000-mL ............................................................................................... each....................14574-53
Pipettor, Jencons, 1–5 mL................................................................................................... each....................27951-00
Replacement tips for 27951-00 .......................................................................................... 100/pkg.............27952-00
Program 95% Confidence Limits of Distribution
802 0.76–0.80 mg/L NH
4
+
–N
Program Portion of Curve ∆Abs ∆Concentration
802 Entire range 0.010 0.01 mg/L NH
4
+
–N