A product of decomposed plant material, tannin occurs in natural waters and is used for boiler and cooling tower water treatment, dyeing, ink manufacture, tanning, and paper sizing. Lignin, also a plant product, is found in paper pulp manufacturing waste. Tannin and lignin are analyzed together and reported as mg/L tannic acid.
 
Tannin and lignin are analyzed together and reported as mg/L tannic acid.
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