DR/2400
Organic Carbon, Total
OrganicCarbonTotal_Other_High_DIR_Eng_Ody.fm Page 1 of 6
• Place a safety shield in front of the COD reactor to prevent injury if splattering occurs.
• A reagent blank is required for each series of samples.
• Wipe the outside of sample cells before each insertion into the instrument cell holder. Use a damp towel followed by a dry one to
remove fingerprints or other marks.
Organic Carbon, Total
Method 10128
Direct Method*
* U.S. Patent 6,368,870
HR (100 to 700 mg/L C)
Scope and Application: For wastewater and industrial waters
1. Turn on the COD
reactor.
Heat to 103–105 °C.
2. Use a graduated
cylinder to add 10 mL of
sample to a 50-mL
Erlenmeyer flask that
contains a stir bar.
3. Add 0.4 mL of Buffer
Solution, pH 2.0. Use pH
paper to make sure the
sample pH is 2.
4. Place the flask on a
stir plate and stir at a
moderate speed for
10 minutes.
Tips and Techniques
Method 10128
HRS MIN SECHRS MIN SEC
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