Hach DR/700 Procedures Manual page 322

VOLATILE ACIDS,
SUMMARY OF METHOD
The volatile acids test is designed specifically for the determination of
volatile acids in digestor sludges. The method is based on esterification
of the carboxylic acids present and determination of the esters by the
ferric hydroxamate reaction. All volatile organic acids present are
reported as their equivalent mg/L acetic acid.
REQUIRED REAGENTS
Volatile Acids Reagent Set (90 tests) . . . . . . . . . . . . . . . . . . . . . 22447-00
Includes: (1) 2039-53, (2) 2042-53, (1) 818-42,
(1) 2040-53, (1) 2038-32
Description
Ethylene glycol . . . . . . . . . . . . 3 mL . . . . . . 1000 mL . . . . . . . 2039-53
Ferric Chloride-Sulfuric
Acid Solution . . . . . . . . . . . 20 mL . . . . . 1000 mL . . . . . . . 2042-53
Hydroxylamine Hydrochloride
Solution, 100 g/L . . . . . . . . 1 mL . . . . . . 100 mL . . . . . . . . . 818-42
Sodium Hydroxide Standard
Solution, 4.5 N . . . . . . . . . . 4 mL . . . . . . 1000 mL . . . . . . . 2040-53
Sulfuric Acid Standard
Solution, 19.2 N . . . . . . . . . 0.4 mL. . . . . 100 mL . . . . . . . . 2038-32
Water, demineralized . . . . . . . . 20.5 mL . . . . 4 L . . . . . . . . . . . . . 272-56
REQUIRED APPARATUS
Centrifuge . . . . . . . . . . . . . . . . 1 . . . . . . . . . each . . . . . . . . . . 22413-00
Centrifuge Tubes . . . . . . . . . . . varies . . . . . . 10/pkg . . . . . . . . 22787-39
Cots, finger . . . . . . . . . . . . . . . 2 . . . . . . . . . 2/pkg . . . . . . . . . 14647-02
Cylinder, graduated, 10 mL. . . 1 . . . . . . . . . each . . . . . . . . . . . . 508-38
DR/700 Filter Module
Number 50.01. . . . . . . . . . . 1 . . . . . . . . . each . . . . . . . . . . 46250-00
Hot Plate, 4-inch circular,
3-1/2" diam. . . . . . . . . . . . . 1 . . . . . . . . . each . . . . . . . . . . 12067-01
Pipet Filler, safety bulb . . . . . . 1 . . . . . . . . . each . . . . . . . . . . 14651-00
Pipet, serological, 2 mL. . . . . . 2 . . . . . . . . . each . . . . . . . . . . . . 532-36
Pipet, volumetric, 0.5 mL . . . . 3 . . . . . . . . . each . . . . . . . . . . 14515-34
Sample Cell, 25-mL, square . . 2 . . . . . . . . . 2/pkg . . . . . . . . . 13537-02
Water Bath and Rack . . . . . . . . 1 . . . . . . . . . each . . . . . . . . . . . 1955-55
continued
Quantity
Per Test Unit
50-72
Cat. No.
Cat. No.