Hach DR2400 - Page 783

DR/2400
Volatile Acids
VolatileAci_None_Other_ESR_Eng_Ody.fm Page 1 of 6
Volatile Acids
Method 8196
Esterification Method*
*Adapted from The Analyst, 87, 949 (1962)
(27 to 2800 mg/L)
Scope and Application: For digestor sludges
1. Touch
Hach Programs.
Select program
770 Volatile Acids.
Touch
Start.
2. Pipet 0.5 mL of
deionized water into a
dry 25-mL sample cell
(the blank).
3. Filter or centrifuge
25 mL of sample.
Centrifuging is faster
than filtration.
4. Pipet 0.5 mL of the
filtrate or supernatant
into a second dry 25-mL
sample cell (the prepared
sample).
5. Pipet 1.5 mL of
ethylene glycol into each
sample cell. Swirl to mix.
6. Pipet 0.2 mL of 19.2 N
Sulfuric Acid Standard
Solution into each cell.
Swirl to mix.
7. Place both cells into
a boiling water bath.
Alternatively, the cells
may be boiled in a 500-mL
beaker.
8. Touch the timer icon.
Touch
OK.
A three-minute reaction
period will begin.
10 mL
20 mL
25 mL
Method 8196
Hach Programs
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