Hach DR2400 - Page 490

Nitrogen, Ammonium
© Hach Company, 2003. All rights reserved. Printed in the U.S.A. 3/04 1ed
Page 4 of 4 NitrogenAmm_UniCell_SAL_Eng_Ody.fm
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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 102 ......................................................................... 23/pkg.............. HCT 102
Required Apparatus
Adapter, 16-mm Cell .......................................................................................................... each....................59457-00
Pipettor, Jencons, 1–5 mL................................................................................................... each....................27951-00
Replacement tips for 27951-00 .......................................................................................... 100/pkg.............27952-00
Optional Reagents
Nitrogen Ammonia Standard Solution, 1000-mg/L NH
3
–N....................................... 1 L ......................23541-53
Sulfuric Acid, ACS.............................................................................................................. 500 mL...................979-49
Sodium Hydroxide Standard Solution, 5.0 N................................................................. 50 mL SCDB .......2450-26
Water, deionized ................................................................................................................. 4 L ..........................272-56
Optional Apparatus
Cylinder, mixing, 100-mL.................................................................................................. each....................20886-42
Flask, volumetric, 1000-mL ............................................................................................... each....................14574-53
Pipet, TenSette
®
, 0.1 to 1.0 mL .......................................................................................... each....................19700-01
Pipet Tips, for TenSette
®
Pipet 19700-01 ......................................................................... 50/pkg...............21856-96