Hach DR/850, Procedures Manual, Page: 368 / 460

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