Reiss TARAtec CD10, Operating Instructions Manual

Page: 42 / 44

Appendix 14 Appendix
42 / 44
TARAtec 9/10
H
2
O
2
Peracetic acid
H
2
O
2
Peracetic acid
H
2
O
2
Peracetic acid
Concentration
range in ppm
0…200 >200…2000 >2000…20000 (2%)
Material
 25 ml sample of the water being
measured
 Sulphuric acid (25%)
 Potassium permanganate (0.01 n)
 Potassium iodide 0.3-0.5 g
(powder)
 Thiosulphate (0.01 n)
 Starch solution (1%)
 25 ml sample of the water being
measured
 Sulphuric acid (25%)
 Potassium permanganate (0.1 n)
 Potassium iodide 0.3-0.5 g
(powder)
 Thiosulphate (0.1 n)
 Starch solution (1%)
 5 ml sample of the water being
measured
 Sulphuric acid (25%)
 Potassium permanganate (0.1 n)
 Potassium iodide 0.3-0.5 g
(powder)
 Thiosulphate (0.1 n)
 Starch solution (1%)
1st titration
stage
H
2
O
2

Add 20 ml sulphuric acid to the sample of the water being measured.

Stirring continuously, titrate with potassium permanganate until the sample colour turns faintly violet.

Make a note of the consumption (A) of potassium permanganate in ml.
2nd titration
stage
PAA

After the 1st titration stage, add potassium iodide.

Stirring continuously, titrate with thiosulphate until the sample colour turns pale yellow.

Add 2 ml starch solution.
 The sample colour turns blue.