LaMotte COD Plus Colorimeter 1922-EX2 - Manual (Page 122)

TANNIN
TUNGSTO-MOLYBDOPHOSPHORIC ACID METHOD
CODE 3666-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
*WARNING: Reagents marked with a * are considered hazardous substances. Material
Safety Data Sheets (MSDS) are supplied for these reagents. For your safety read label
and accompanying MSDS before using.
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: 0.00 – 10.00 ppm Tannic Acid
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 sulfites.
Results may be expressed as tannin like compounds, or
aromatic hydroxy compounds.
COD PLUS TEST PROCEDURES 6/02 TANNIN 1/2