Notes on chlorine, ozone and pH value determination
Chlorine reagent A1 for approx. 150 measurements, content 16 ml
Chlorine reagent A2 for approx. 150 measurements, content 12 ml
Chlorine reagent B for approx. 150 measurements, content 16 ml
pH reagent indicator solution for approx. 50 measurements, content 16 ml
Implementation of the determination of:
1. Chlorine (free)
- first 3 drops A1 (buffer)
then 2 drops A2 (DPD reagent solution)drop into the empty cell. Fill the cell up to the 10 ml mark with water, stir or swivel slightly and measure after approx. 1 minute.result = mg/l free Chlorine
2. Chlorine (total)
- Add reagent solution B for total Chlorine measurement as follows:
in water sample above 3 drops of solution B
add, swivel slightly and read value after approx. 1 minuteresult = mg/l total Chlorine
3. Chlorine (combined)
- result of the determination 2.
– result of the determination 1.
= mg/l combined Chlorine
4. pH value
- pH indicator solution for pH range 6,5 – 8,4
6 drops in 10 ml water
swivel slightly and read off the pH value.
5. Ozone (in absence of chlorine)
- The measurement is carried out with the GPT photometer in chlorine mode.
First 3 drops of solution B into the empty cell, fill up to the 10 ml mark with test water
then 3 drops of DPD solution A1
then 2 drops of solution A2 add and swivel, read value after approx. 2 minutes
x factor 0,677
= mg/l Ozone
The drop numbers given above apply to concentrations up to 3 mg/l. For concentrations up to 6 mg/l, the number of drops must be doubled. For higher concentrations, the sample water must be diluted in a suitable way. After use, the dropping bottles must be closed again immediately with the respective screw cap – the caps must not be mixed up!
blue cap on bottle A1
white cap on bottle A2
red cap on bottle B
black cap on bottle pH
Store the reagent set in a cool place if possible.
Thoroughly rinse the vial and cap after measurements using the cleaning brush to eliminate carry-over errors and deposits.