Organic Carbon, Total, Mid Range, Direct Method - Hach DR/850 Procedures Manual

ORGANIC CARBON, TOTAL, Mid Range
*
Direct Method
1.
Turn on the
DRB 200 reactor. Heat
to 103–105 °C.
Note: See DRB 200 user
manual for selecting
pre-programmed
temperature applications.
5.
Label two Mid
Range Acid Digestion
vials: sample and
reagent blank.
Note: A reagent blank is
required for each series of
samples.
* Patent pending
2.
Use a graduated
cylinder to add 10 mL of
sample to a 50-mL
erlenmeyer flask
containing a stir bar.
6.
Using a funnel, add
the contents of one TOC
Persulfate Powder
Pillow to each Acid
Digestion vial (colorless
liquid).
For wastewater and industrial waters
3.
Add 0.4 mL of
Buffer Solution, pH 2.0.
Note: Use pH paper to make
sure the sample pH is 2.
®
7.
Use a TenSette
Pipet to add 1.0 mL of
organic-free water to
the reagent blank vial
and1.0 mL of prepared
sample to the sample
vial. Do not cap the vial;
swirl gently to mix.
299
Method 10173
(15–150 mg/L C)
HRS MIN SEC HRS MIN SEC
4.
Place the flask on a
stir plate and stir at a
moderate speed for
10 minutes.
8.
Rinse two blue
Indicator Ampules with
deionized water and
wipe them with a soft,
lint-free wipe.
Note: Do not touch the
ampules on the sides after
wiping. Pick them up by the
top.