pH buffer solution

€10.95 *
Content: 100 ml

* Prices incl. VAT
plus potential shipping costs

Ready to ship, arrives in 2 - 5 days

Free Shipping from €29 within DE per GLS

Unit Size:

pH Value:

  • Z0030100
  • 4260169961505
  • 0.11 kg
  • 4.00 cm × 11.00 cm × 4.00 cm
P Secure bonuspoints now
For Calibration of pH Combination Electrodes (standardized to 20 °C) Why calibrate/adjust... more
Product information »pH buffer solution«

For Calibration of pH Combination Electrodes (standardized to 20 °C)

Why calibrate/adjust

The electronics of the pH meter must be adapted to the special characteristics of the pH meter used by calibration. Not only different meters vary from each other (zero point, slope), but the same meter also changes due to ageing processes.
Precise and reproducible PH measurements are therefore only possible when calibration is carried out regularly and carefully.

The frequency of this procedure naturally depends on the place of use and the purpose. If measurement is carried out under greatly changing conditions, calibration is recommended before every measurement.
In the case of constant measurement in the aquarium, it is sufficient to calibrate every 2 - 4 weeks if nothing else has changed. A new meter or one at the end of its service life will change to a greater degree and therefore calibration will be necessary more often than in the middle of the expected service life.

Selection of the buffers

For two-point calibration, the two buffer solutions are selected in such a way that the pH to be measured is between the values of the two buffers where possible.
The ability to calibrate pH 4 and pH 9 to cover the whole pH range is only seemingly advantageous. Due to non-linearities of the meter and of the measuring amplifier, however, it leads to significant errors.

Temperature-dependence of the pH at various temperatures

As can be seen, it is very important to observe the correct temperature during calibration.

TemperatureBuffer pH 4Buffer pH 7Buffer pH 9
0 °C 4.03 7.13 9.24
10 °C 4.02 7.05 9.11
20 °C 4.00 7.00 9.00
30 °C 4.00 6.98 8.93
40 °C 4.00 6.97 8.86
50 °C 4.00 6.96 8.80
60 °C 4.00 6.96 8.75
70 °C 4.00 6.97 8.71
80 °C 4.00 6.98 8.67
90 °C 4.00 7.00 8.64

Handling buffer solutions

To ensure exact calibration, buffer solutions must be handled carefully. All dirt is to be avoided.
Therefore, never pour buffer solutions back into the storage bottle or calibrate directly in the storage bottle. Used buffer solutions are disposed of and not used a second time.

In the case of alkaline buffer solutions (pH > 7), the CO2 in the air causes a gradual neutralisation of the buffer. The storage bottles should therefore be resealed as soon as possible after use and contact with air reduced to a minimum.

Composition of the buffer solutions offered

pH 4 (20 °C) d204 = 1.007 (~ 0.056 m citric acid solution / ~ 0.068 m NaOH solution / ~ 0.044 m NaCl solution)

pH 7 (20 °C) d204 = 1.006 (~ 0.029 m NaOH solution / ~ 0.050 m KH2PO4 solution)

pH 9 (20 °C) d20 4 = 1.001 (~ 0.013 m Na2B4O7 solution / ~ 0.0046 m HCl solution)

(NaOH - sodium hydroxide, NaCl - sodium chloride, KH2PO4 - potassium dihydrogen phosphate, Na2B4O7 - sodium borate or borax, HCl - hydrochloric acid)

The solutions and chemicals used are non-toxic (at least in small quantities). Nevertheless, the electrodes should be thoroughly rinsed with demineralised water before being re-used in the aquarium. The buffers and rinsing solution can be poured directly down the drain without reservations.

Related links to »pH buffer solution«
Read, write and discuss reviews... more
Customer evaluation for "pH buffer solution"
Write an evaluation
Evaluations will be activated after verification.
Please enter these characters in the following text field.

The fields marked with * are required.

Please note our Data Protection Declaration.

Ferrdrakon Full Iron Fertilizer Bottles Ferrdrakon Full Iron Fertilizer
0.25 Litre (€33.80 / Litre)
From €8.45 *
KramerDrak Bottles KramerDrak Special Iron Complete Fertilizer for Strong...
0.25 Litre (€42.60 / Litre)
From €10.65 *
Eudrakon N Bottles Eudrakon N Nitrogen Fertilizer Solution
0.25 Litre (€33.40 / Litre)
From €8.35 *
Duradrakon 100 g Tin Duradrakon Hardener Salt
0.1 kg (€82.00 / kg)
From €8.20 *
Daydrakon Daily Fertilizer & Iron Fertilizer Bottles Daydrakon Daily & Iron Fertilizer
0.25 Litre (€33.80 / Litre)
From €8.45 *
Granulated Black Peat Standard Granulated Black Peat Standard
0.5 Litre (€9.98 / Litre)
From €4.99 *
Zuebi Bits Zuebi / Tin
150 ml (€4.63 / 100 ml)
From €6.95 *
Aquadrakon Black Flaschen Aquadrakon Black Water Conditioning
0.25 Litre (€42.60 / Litre)
From €10.65 *
Eudrakon P Flaschen Eudrakon P Solution
0.25 Litre (€28.20 / Litre)
From €7.05 *
Terrdrakon Substrate 500 g Terrdrakon Substrate
0.25 kg (€29.20 / kg)
From €7.30 *
Duradrakon TH-Plus 100 g Tin Duradrakon TH-Plus Hardener Salt Mixture
0.1 kg (€119.50 / kg)
From €11.95 *
FD Bloodworms FD Bloodworms / Stand-up Pouch(es)
25 g (€23.80 / 100 g)
From €5.95 *
Pepsin based cleaning solution 100 ml Pepsin based cleaning solution - Protein remover
50 ml (€11.90 / 100 ml)
From €5.95 *
Aquadrakon EL Bottles Aquadrakon EL Water Conditioning
0.25 Litre (€33.40 / Litre)
From €8.35 *
Decapsulated Artemiacysts Bags Decapsulated Artemiacysts / Stand-up Pouch
50 g (€15.90 / 100 g)
From €7.95 *
Phosphareduc 100 g Package Phosphareduc Phosphate Fixer
0.1 kg (€49.50 / kg)
From €4.95 *
Calibration Solution Conductivity 1413 µS/cm Calibration Solution Conductivity 1413 µS/cm
50 ml (€11.90 / 100 ml)
From €5.95 *
Zueflo Flakes Zueflo Grower-Flakes / Tin
150 ml (€2.97 / 100 ml)
From €4.45 *
Zuesti Sticks Zuesti / Tin
150 ml (€4.63 / 100 ml)
From €6.95 *
KramerDrak Power Cubes KramerDrak Power
From €9.95 *
Chlorella Micro Algae Granulate Chlorella Micro Algae Granulate
0.05 kg (€159.00 / kg)
From €7.95 *
Spirulina Mikro Algae Powder Spirulina Micro Algae Powder
50 g (€9.90 / 100 g)
From €4.95 *
Granulated Black Peat Micro Granulated Black Peat Micro
0.5 Litre (€7.98 / Litre)
From €3.99 *
Chlorella Micro Algae Powder 100 g Chlorella Micro Algae Powder
0.05 kg (€139.00 / kg)
From €6.95 *
Ferrdrakon K Flaschen Ferrdrakon K Solution
0.25 Litre (€42.60 / Litre)
From €10.65 *
NEW
Zuesti Sticks Zuesti / Stand-up Pouch
100 g
From €6.95 *
Diaphragm cleaner with thiourea 100 ml Cleaning solution with thiourea - Diaphragm cleaner
50 ml (€11.90 / 100 ml)
From €5.95 *
pH/CH-Minus Bottles DRAK pH/CH-Minus - pH and KH easily and quickly lowered
0.25 Litre (€33.40 / Litre)
From €8.35 *
Ferrdrakon Full Iron Fertilizer Bottles Ferrdrakon Full Iron Fertilizer
0.25 Litre (€33.80 / Litre)
From €8.45 *
Konservierte Rote Mückenlarven 100 g Dose Canned Blodworms 100 g Tin
0.1 kg (€42.90 / kg)
€4.29 *
Duradrakon T TH Plus 100 g Duradrakon T TH-Plus
0.1 kg (€119.50 / kg)
From €11.95 *
Terrdrakon Substrate 500 g Terrdrakon Substrate
0.25 kg (€29.20 / kg)
From €7.30 *
Aquadrakon EL Bottles Aquadrakon EL Water Conditioning
0.25 Litre (€33.40 / Litre)
From €8.35 *
Aquadrakon Black Flaschen Aquadrakon Black Water Conditioning
0.25 Litre (€42.60 / Litre)
From €10.65 *
Hint!
Fulvodrakon - Concentrated Fulvic and Humic acids Fulvodrakon - Concentrated Fulvic and Humic acids
0.1 Litre (€79.50 / Litre)
From €7.95 *
KramerDrak Bottles KramerDrak Special Iron Complete Fertilizer for Strong...
0.25 Litre (€42.60 / Litre)
From €10.65 *
Hint!
Carbodrakon Activated Carbon Block Bottom Bag Carbodrakon - Special Activated Carbon Pellets 3 mm
0.2 kg (€39.95 / kg)
From €7.99 *
Zuebi Bits Zuebi / Tin
150 ml (€4.63 / 100 ml)
From €6.95 *
FD Bloodworms FD Bloodworms / Tin
150 ml (€3.97 / 100 ml)
From €5.95 *
Chlorella Micro Algae Granulate Chlorella Micro Algae Granulate
0.05 kg (€159.00 / kg)
From €7.95 *
Duradrakon TH-Plus 100 g Tin Duradrakon TH-Plus Hardener Salt Mixture
0.1 kg (€119.50 / kg)
From €11.95 *
Granulated Black Peat Standard Granulated Black Peat Standard
0.5 Litre (€9.98 / Litre)
From €4.99 *
Phosphareduc 100 g Package Phosphareduc Phosphate Fixer
0.1 kg (€49.50 / kg)
From €4.95 *
Hint!
Sealutions Mineral Salt 1 kg Tin Sealutions Mineral Salt
1 kg
From €19.95 *
Visidrakon - Water Clarifier Visidrakon - Water Clarifier
50 ml (€11.90 / 100 ml)
From €5.95 *
Viewed