Hach DR/850 - Page 368

368
Summary of Method
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.
REQUIRED REAGENTS
Reactive Phosphorus Test ’N Tube Reagent Set.................................50 tests.............27425-45
Includes: (1) 21060-46, (50) Orthophosphate Dilution Vials*
Quantity Required
Description Per Test Unit Cat. No.
PhosVer 3 Phosphate Reagent Powder Pillows ..................1 ..............50/pkg .............21060-46
50 Orthophosphate Test ‘N Tube Dilution Vials ................1 ..............50/pkg
.................................. *
REQUIRED APPARATUS
COD/TNT Adapter .............................................................1 ..................each .............48464-00
Funnel, micro......................................................................1 ..................each .............25843-35
Pipet, TenSette, 1 to 10 mL.................................................1 ..................each.............19700-10
Pipet Tips, for 19700-10 TenSette Pipet.............................1 ..............50/pkg .............21997-96
Test Tube Rack ............................................................... 1-3 ..................each .............18641-00
OPTIONAL REAGENTS
Bromine Water, 30 g/L......................................................................... 29 mL ...............2211-20
Drinking Water Standard, Inorganic, F
–
, NO
3
–N,
PO
4
3–
, SO
4
2–
.................500mL..........28330-49
Hydrochloric Acid Standard Solution, 6.0 N (1:1)............................ 500 mL .................884-49
Phenol Solution, 30 g/L....................................................................... 29 mL ...............2112-20
Phosphate Standard Solution, 1 mg/L as PO
4
3-
.................................. 500 mL ...............2569-49
Phosphate Standard Solution, Voluette ampule,
50 mg/L as PO
4
3-
, 10 mL ...............................................................16/pkg .................171-10
Phosphate Standard Solution, PourRite ampule,
50 mg/L as PO
4
3-
, 2 mL .................................................................20/pkg ..............171-20H
Wastewater Effluent Standard, Inorganic
(NH
3
–N, NO
3
–N, PO
4
, COD, SO
4
, TOC)......................................500 mL..........28332-49
Water, deionized........................................................................................ 4 L .................272-56
* These items are not sold separately.
PHOSPHORUS, REACTIVE, continued