Hach DR/850, Procedures Manual, Page: 163 / 460

163
Distillation Procedures
A detailed procedure for the distillation of cyanide samples is
included with the Hach Distillation Apparatus. Three detailed
procedures, Free Cyanides, Cyanides Amenable to Chlorination,
and Total Cyanides, are included with the four- and ten-position
Midi-Dist Distillation System. See the Optional Apparatus
listing.
Summary of Method
The pyridine-pyrazolone method gives an intense blue color with
free cyanide. A sample distillation is required to determine
cyanide from transition and heavy metal cyanide complexes.
REQUIRED REAGENTS
Cat. No.
Cyanide Reagent Set (100 Tests), 10 mL samples ........................................................24302-00
Includes: (1) 21068-69, (1) 21069-69, (1) 21070-69
Quantity Required
Description Per Test Unit Cat. No.
CyaniVer 3 Cyanide Reagent Powder Pillows ........ 1 pillow................100/pkg ..........21068-69
CyaniVer 4 Cyanide Reagent Powder Pillows ........ 1 pillow................100/pkg ..........21069-69
CyaniVer 5 Cyanide Reagent Powder Pillows ........ 1 pillow................100/pkg ..........21070-69
REQUIRED APPARATUS
Sample Cell, 10-20-25, w/cap .......................................2 .........................6/pkg ..........24019-06
OPTIONAL REAGENTS
Description Unit Cat. No.
Acetic Acid, Glacial .............................................................................. 500 mL ..............100-49
Ascorbic Acid............................................................................................ 100 g ............6138-26
Bromine Water ........................................................................................ 25 mL ............2211-20
Buffer Solution, pH 4.0 ......................................................................... 500 mL ..........12223-49
Hexanes, ACS ....................................................................................... 500 mL ..........14478-49
HexaVer Chelating Reagent Powder Pillows ........................................100/pkg ..............243-99
Hydrochloric Acid Standard Solution, 2.5 N .............................. 100 mL MDB ............1418-32
Magnesium Chloride Solution ..................................................................... 1 L ..........14762-53
m-Nitrophenol Indicator.............................................................. 100 mL MDB ............2476-32
Potassium Iodide Solution, 30 g/L .............................................. 100 mL MDB ..............343-32
Sodium Arsenite Solution, APHA .............................................. 100 mL MDB ............1047-32
Potassium Cyanide, ACS ............................................................................ 28 g ..............767-14
Sodium Hydroxide Standard Solution, 0.25 N............................................ 1 L ..........14763-53
Sodium Hydroxide Standard Solution, 5.0 N............................................... 1 L ............2450-53
CYANIDE,
continued