Hach DR2400 - Page 432

Nitrate
© Hach Company, 2003. All rights reserved. Printed in the U.S.A. 3/04 1ed
Page 6 of 6 Nitrate_AVPP_Mid_CDR_Eng_Ody.fm
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Method Performance
Precision
Standard: 10 mg/L NO
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
Cadmium metal reduces nitrates in the sample to nitrite. The nitrite ion reacts in
an acidic medium with sulfanilic acid to form an intermediate diazonium salt.
The salt couples with gentisic acid to form an amber colored solution. Test
results are measured at 430 nm.
Required Reagents
Quantity Required
Description per test Unit Cat. No.
NitraVer
®
5 Nitrate Reagent Powder Pillows (for 10 mL sample)....1 pillow........... 100/pkg.............21061-69
or
NitraVer
®
5 Nitrate Reagent AccuVac
®
Ampul...................................1 ampul........... 25/pkg...............25110-25
Required Apparatus
Sample Cells, 10-mL, w/cap...................................................................2 ....................... 6/pkg.................24276-06
Beaker, 50-mL............................................................................................1 ....................... each.................... 500-41H
Required Standards
Nitrate Nitrogen Standard Solution, 1.00-mg/L NO
3
–
–N............................................ 500 mL.................2046-49
Nitrate Nitrogen Standard Solution, 10.0-mg/L NO
3
–
–N............................................ 500mL....................307-49
Nitrate Nitrogen Standard Solution, 100-mg/L NO
3
–
–N............................................. 500 mL.................1947-49
Water, deionized ................................................................................................................. 4 liters....................272-56
Program 95% Confidence Limits of Distribution
353 8.0–12.0 mg/L NO
3
–
–N
359 9.2–10.8 mg/L NO
3
–
–N
Program Portion of Curve ∆Abs ∆Concentration
353 Entire range 0.010 0.1 mg/L NO
3
–
–N
359 Entire range 0.010 0.1 mg/L NO
3
–
–N