Tannin and Lignin
Tannin and Lignin
Page 2 of 4
TanninLig_None_Other_TYR_Eng_Ody.fm
Interferences
Sample Collection, Storage, and Preservation
Collect samples in clean plastic or glass bottles.
5. Pipet 5.0 mL of
Sodium Carbonate
Solution into each cell.
Swirl to mix.
A blue color will develop
if tannins and/or lignins
are present.
6. Touch the timer icon.
Touch
OK.
A 25-minute reaction
period will begin.
7. When the timer
beeps, place the blank
into the cell holder.
8. Touch Zero.
The display will show:
0.0 mg/L Tannins
(as Tannic Acid)
9. Place the prepared
sample into the cell
holder.
10. Touch Read.
Results will appear in
mg/L Tannins.
Interfering Substance Interference Levels and Treatments
Ferrous iron
Causes a positive interference. (2 mg/L of ferrous iron produces a color equivalent to about
1 mg/L of tannic acid.) To eliminate interference of ferrous iron up to 20 mg/L, add one 0.2 g
scoop of Sodium Pyrophosphate (Cat. No. 14295-25) to the sample before testing.
Sulfite
Interference is eliminated by adding 1 mL of formaldehyde (Cat. No. 2059-32) to the sample
before testing the sample.
10 mL
20 mL
25 mL
10 mL
20 mL
25 mL
10 mL
20 mL
25 mL
Zero
10 mL
20 mL
25 mL
Read
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