DR/2400
Formaldehyde
Formaldehyde_PP_Other_MBT_Eng_Ody.fm Page 1 of 6
• Analyze samples immediately. Do not preserve for later analysis.
• Wash glassware with Chromic Acid Cleaning Solution (Cat. No. 1233-49) to remove trace contaminants.
• 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.
• Time and temperature are very important in this test. The sample should be 25 ±1°C, and the times specified in steps must be
followed precisely. A temperature-controlled water bath is recommended for best accuracy.
• Obtain formaldehyde-free water by distilling water from alkaline permanganate (4 g Sodium Hydroxide (Cat. No. 187-34), 2 g
Potassium Permanganate (Cat. No. 769-05) per 500 mL of water). Discard the first 50–100 mL of distillate.
Formaldehyde
Method 8110
MBTH Method*
* Adapted from Matthews, T.G. and Howell, T.C., Journal of the Air Pollution Control Association, 31 (11) 1181-1184 (1981).
Powder Pillows
(3 to 500 µg/L)
Scope and Application: For water
1. Touch
Hach Programs.
Select program
200 Formaldehyde.
Touch
Start.
2. Accurately measure
25 mL of sample in a
50-mL mixing cylinder
(this is the prepared
sample).
3. Accurately measure
25 mL of formaldehyde-
free water in a second
50-mL mixing cylinder
(this is the blank).
4. Add the contents of
one MBTH Powder
Pillow to the blank.
Stopper the cylinder.
Tips and Techniques
Powder Pillows Method 8110
Hach Programs
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