Hach DR/850, Procedures Manual, Page: 132 / 460

132
along with free chlorine present in the sample to form a red color
which is proportional to the total chlorine concentration. To
determine the concentration of combined chlorine, run free
chlorine and total chlorine tests. Subtract the results of the free
chlorine test from the results of the total chlorine test to obtain
combined chlorine.
Pollution Prevention and Waste Management
Samples treated with sodium arsenite for manganese or
chromium interferences will be hazardous wastes as regulated by
Federal RCRA for arsenic (D004). See
Section 3 for more
information on proper disposal of these materials.
REQUIRED REAGENTS & APPARATUS (USING POWDER PILLOWS)
Description Qty/Test Unit Cat. No.
DPD Total Chlorine Reagent Powder Pillows .........1 pillow ............... 100/pkg.......... 21056-69
Sample Cell, 10-20-25 mL, w/caps .............................. 2......................... 6/pkg.......... 24019-06
REQUIRED REAGENTS & APPARATUS (USING ACCUVAC AMPULS)
DPD Total Chlorine Reagent AccuVac Ampuls ......1 ampul ................. 25/pkg.......... 25030-25
Beaker, 50 mL .............................................................. 1........................... each........... 500-41H
OPTIONAL REAGENTS
Description Unit Cat. No.
Chlorine Standard Solution, PourRite ampule, 25-30 mg/L Cl
2
............ 20/pkg.......... 26300-20
DPD Total Chlorine Reagent, SwifTest ............................................... 250 tests.......... 28024-00
Potassium Iodide Solution, 30 g/L............................................. 100 mL
*
MDB.............. 343-32
Sodium Arsenite, 5 g/L............................................................. 100 mL
*
MDB............ 1047-32
Sodium Hydroxide Standard Solution, 1 N .............................. 100 mL
*
MDB............ 1045-32
Sulfuric Acid Standard Solution, 1 N ....................................... 100 mL
*
MDB............ 1270-32
Water, deionized............................................................................................ 4 L.............. 272-56
OPTIONAL APPARATUS
AccuVac Snapper Kit.................................................................................. each.......... 24052-00
PourRite Ampule Breaker........................................................................... each.......... 24846-00
Cylinder, graduated, 25 mL ........................................................................ each.............. 508-40
pH Indicator Paper, 1 to 11 pH units ................................................ 5 rolls/pkg.............. 391-33
pH Meter,
sens
ion
™ 1 , portable ................................................................... each.......... 51700-00
Pipet, TenSette, 0.1 to 1.0 mL..................................................................... each.......... 19700-01
Pipet Tips, for 19700-01 TenSette Pipet ................................................. 50/pkg.......... 21856-96
Pipet Tips, for 19700-01 TenSette Pipet ............................................. 1000/pkg.......... 21856-28
For Technical Assistance, Price and Ordering
In the U.S.A.—Call 800-227-4224
Outside the U.S.A.—Contact the Hach office or distributor serving you.
* Marked Dropper Bottle - contact Hach for larger sizes.
CHLORINE, TOTAL,
continued