Hach DR2400 - Page 479

Nitrogen, Ammonia
Nitrogen, Ammonia
NitrogenAmm_TNT_High_SAL_Eng_Ody.fm Page 5 of 6
Method Performance
Precision
Standard: 10.0 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 green-colored solution. Test results are
measured at 655 nm.
Required Reagents
Quantity Required
Description per test Unit Cat. No.
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
®
Pipet 19700-01 ......................................................................... 50/pkg...............21856-96
Required Standards
Nitrogen Ammonia Standard Solution, 10-mg/L NH
3
–N........................................... 500 mL...................153-49
Nitrogen Ammonia Standard Solution, 100-mg/L NH
3
–N......................................... 500 mL...............24065-49
Nitrogen Ammonia Standard Solution, 150-mg/L NH
3
–N,
10-mL PourRite
®
Ampules ........................................................................................ 16/pkg...............21284-10
Nitrogen Ammonia Standard Solution, 50-mg/L NH
3
–N,
10-mL Voluette
®
Ampules ......................................................................................... 16/pkg...............14791-10
Water, deionized ................................................................................................................. 4 L ..........................272-56
Program 95% Confidence Limits of Distribution
343 8.9–11.1 mg/L NH
3
–N
Portion of Curve ∆Abs ∆Concentration
Entire range 0.010 0.4 mg/L NH
3
–N