Hach DR2400 Manual page 617

Method Performance
Summary of Method
Required Reagents
Description
Rapid Liquid Low Range Phosphorus Reagent Set ...................................................................................26786-00
Includes:
Ascorbic Acid Reagent Dilution Solution ...................................... 1 mL ................ 450 mL...............25999-49
Ascorbic Acid Reagent Powder ................................................................................. 48 g.....................26512-55
Molybdate Reagent Solution ............................................................ 2 mL ................ 500 mL...............25998-49
Water, deionized ................................................................................................................. 4 L ..........................272-56
Required Apparatus
Adapter, multi-pathlength cell ............................................................... 1 ....................... each....................59466-00
Cylinder, graduated, 25-mL, poly .......................................................... 2 ....................... each......................1081-40
Dispenser, fixed volume, 1.0-mL w/bottle ........................................... 2 ....................... each.................... 21113-02
Flask, Erlenmeyer, 125-mL, PMP w/cap............................................... 2 ....................... each....................20898-43
Pour-Thru Cell Assembly........................................................................ 1 ....................... each....................59404-00
Required Standards
Phosphate Standard Solution, 1.00-mg/L as PO
Phosphate Standard Solution, Voluette
Phosphate Standard Solution, 15-mg/L PO
PhosphorusReac_PT_Low_ASC_Eng_Ody.fm
Precision
Standard: 1000 µg/L PO
Program
488
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.
Orthophosphate reacts with molybdate in an acid medium to produce a
phosphomolybdate complex. Ascorbic acid then reduces the complex, giving an
intense molybdenum blue color. Reactive phosphorus includes existing
orthophosphate in the sample plus a small fraction of condensed phosphate that
may be hydrolyzed to orthophosphate during the test. Test results are measured
at 880 nm.
3–
4
®
ampule, 10-mL, 50-mg/L PO
3–
.............................................................. 100 mL...............14243-42
4
Phosphorus, Reactive
3–
4
95% Confidence Limits of Distribution
976–1024 µg/L PO
∆Abs
0.010
Quantity Required
Per Test
...................................................... 500 mL.................2569-49
3–
............... 16/pkg...................171-10
4
3–
4
∆Concentration
3–
19 µg/L PO
4
Unit Cat. No.
Phosphorus, Reactive
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