Hach DR2400 Manual page 479

Method Performance
Summary of Method
Required Reagents
Description
Reagent Set, High Range Test 'N Tube™ AmVer™ Nitrogen Ammonia................... 50 tests ...............26069-45
Required Apparatus
Adapter, 16-mm Cell ................................................................................ 1 ....................... each....................59457-00
Funnel, micro (for adding reagent) .................................................................................. each....................25843-35
®
Pipet, TenSette , 0.1 to 1.0 mL .......................................................................................... each....................19700-01
®
Pipet Tips, for TenSette
Required Standards
Nitrogen Ammonia Standard Solution, 10-mg/L NH
Nitrogen Ammonia Standard Solution, 100-mg/L NH
Nitrogen Ammonia Standard Solution, 150-mg/L NH
®
10-mL PourRite Ampules ........................................................................................ 16/pkg...............21284-10
Nitrogen Ammonia Standard Solution, 50-mg/L NH
®
10-mL Voluette Ampules ......................................................................................... 16/pkg...............14791-10
Water, deionized ................................................................................................................. 4 L ..........................272-56
NitrogenAmm_TNT_High_SAL_Eng_Ody.fm
Precision
Standard: 10.0 mg/L NH
Program
343
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 green-colored solution. Test results are
measured at 655 nm.
Pipet 19700-01 ......................................................................... 50/pkg...............21856-96
–N
3
95% Confidence Limits of Distribution
8.9–11.1 mg/L NH
∆Abs
0.010
Quantity Required
per test
–N........................................... 500 mL...................153-49
3
–N......................................... 500 mL...............24065-49
3
–N,
3
–N,
3
Nitrogen, Ammonia
–N
3
∆Concentration
0.4 mg/L NH –N
3
Unit
Nitrogen, Ammonia
Page 5 of 6
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