Ph-Value With Liquid Reagent - Aqualytic AL100 Instrucciones

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Methods
GB

pH-value with liquid reagent

PH
6.5 – 8.4
Tablet Powder
Fill a clean vial (24 mm Ø) with 10 ml of the water sample and
0.0.0
perform zero calibration (see "Operation").
Tablet Powder
Fill the vial with drops of the same size by holding the bottle vertically
and squeeze slowly:
6 drops of PHENOL RED solution.
Close the vial tightly with the cap and invert several times to mix the
contents.
Place the vial in the sample chamber making sure that the
are aligned.
Zero
Press the [ZERO/TEST] key.
Test
PH
The method symbol flashes for approx. 3 seconds.
Tablet Powder
RESULT
The result is shown in the display as pH-value.
Tablet Powder
Tolerance: ± 0.2 pH
Notes:
1. When testing chlorinated water the residual chlorine contents can influence the colour
reaction of the liquid reagent. This can be avoided (without interfering with the pH
measurement) by adding a small crystal of Sodiumthiosulfate (Na
sample before adding the PHENOL RED solution. PHENOL RED tablets already contain
Thiosulfate.
2. Due to differing drop sizes results can show a discrepancy in accuracy by comparison
with tablets. This can be minimised by using a pipette (0.18 ml PHENOL RED solution is
equivalent to 6 drops).
3. After use replace the bottle cap securely.
4. Store the reagent in a cool, dry place ideally between 6°C and 10°C.
5. Salt error
For higher salt concentrations the measurement values have to be adjusted as follows:
Salt content
Correction
1) according to Kolthoff (1922)
according to Parson und Douglas (1926)
2)
Reagent
PHENOL RED solution
AL100_10 04/2017
30 g/l (seawater) 60 g/l
- 0,15 - 0,21
1)
Form of reagent/Quantity
Liquid reagent / 15 ml
S O · 5 H O) to the
2 2 3 2
120 g/l 180 g/l
- 0,26 - 0,29
2) 2)
Order-No.
471040
marks
2)
33