TANNIN
TUNGSTO-MOLYBDOPHOSPHORIC ACID METHOD
CODE 3666-01-SC
QUANTITY CONTENTS CODE
30 mL *Tannin Reagent #1 *7833-G
2 x 60 mL *Tannin Reagent #2 *7834-H
1 Pipet, plain, plastic 0352
1 Pipet, 1.0 mL, plastic 0354
Tannin and lignin are examples of hydroxylated aromatic compounds found in
discharge wastewater from paper mills, in some boiler water treatment, in natural
brackish water, and in wastewater from leather tanning plants. The taste and odor
of these compounds is generally offensive so that their control is important in many
areas.
APPLICATION: Industrial wastewater, boiler water, and natural water.
RANGE: 0.0–10.0 ppm Tannic Acid
MDL: 0.1 ppm
METHOD: The hydroxylated aromatic compounds will reduce a
mixture of tungstophosphoric and molybdophosphoric
acids to form a blue color in proportion to the
concentration of aromatic hydroxyl groups.
SAMPLE HANDLING
& PRESERVATION:
Sample should be analyzed as soon as possible after
collection.
INTERFERENCES: Other reducing compounds such as ferrous iron and
sulfi tes. Results may be expressed as tannin like
compounds, or aromatic hydroxy compounds.
SMART3 Test Procedures 11.10 TANNIN
Test Procedures
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