For pH buffers, check the pH value and the temperature it is stated at (most here are specified at 25 °C), the tolerance, and whether the lot is traceable to a reference standard if your quality system requires it. Color-coded buffers, such as red for pH 4, yellow for pH 7 and blue for pH 10, help avoid mix-ups during calibration. Sizes run from 500 mL bottles to 4 L bottles and 10 L and 20 L Cubitainers, so buy a size you will use before the expiration date. Electrode storage solution, offered in several sizes, keeps pH electrodes ready between uses.
Buffers and Solutions: common questions
What is 1,10-phenanthroline used for?
1,10-Phenanthroline is an organic compound that forms an intensely colored orange-red complex with ferrous iron, which is the basis of a common colorimetric method for measuring iron in water and other samples. The iron complex, known as ferroin, is also used as a redox indicator in titrations. It is sold as the monohydrate or anhydrous form, so check which one your method calls for.
How long do pH buffer solutions last once opened?
An unopened buffer is good until the manufacturer's expiration date. Once opened, buffers can change as they absorb carbon dioxide from the air or become contaminated, and alkaline buffers such as pH 10 are affected most. Pour what you need into a clean container, never return used buffer to the bottle, keep it capped, and replace it if calibration results drift.
What is the difference between a buffer and a reagent?
A buffer is a solution that resists changes in pH when small amounts of acid or base are added, usually a weak acid or base mixed with its salt. A reagent is any substance used to cause or measure a chemical reaction. Buffers are a kind of reagent used to hold pH steady in analyses, biological work and instrument calibration.
Shop by type: pH Buffers · Blends
Top brands: Reagents Inc · LabChem · Spectrum Chemical
Popular Buffers and Solutions:
Buffers and Solutions
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DO Electrode Inner Solution Refill (30ml)SKU: AI4112-EAManufacturer: Apera InstrumentsThe inner solution refill for Apera DO500 polarographic DO electrode (30ml) (1 per EA )Learn Morewas $20.00 Special Price $16.80 -
pH Electrode Maintenance Probe Care Kit, including pH 4/7/10 buffers (4oz), 3M KCL Soaking Solution (4oz), Probe Cleaning Solution (8oz), a CalPod Solution OrganizerSKU: AI1170-EAManufacturer: Apera InstrumentspH Electrode Maintenance Probe Care Kit, including pH 4/7/10 buffers (4oz), 3M KCL Soaking Solution (4oz), Probe Cleaning Solution (8oz), a CalPod Solution Organizer (1 per EA )Learn Morewas $55.00 Special Price $47.52 -
Electrode Cleaning Solution 8oz.SKU: AI1166-EAManufacturer: Apera InstrumentsElectrode Cleaning Solution 8oz. (1 per EA )Learn Morewas $22.00 Special Price $19.01 -
pH 7.00 Calibration Buffer Solution 16 ozSKU: AI1101-L-EAManufacturer: Apera InstrumentspH 7.00 Calibration Buffer Solution 16 oz (1 per EA )Learn Morewas $17.00 Special Price $14.69 -
pH Calibration Solution Kit, 7.00, 4.00, 10.01, 16 oz, 3M KCl storage solution 4 oz, CalBox includedSKU: AI1104-EAManufacturer: Apera Instruments16oz. pH Calibration Buffer Solution Kit (pH 4.00, 7.00 & 10.01), 4oz. storage solution for pH/ORP Electrodes, plus Apera’s CalBox for easy calibration High Accuracy (±0.01 pH): standardized against NIST certified pH references within 0.01 pH at 25°C (77° (1 per EA )Learn Morewas $60.00 Special Price $51.84 -
pH Calibration Solution Kit, 7.00, 4.00, 8oz., Storage solution 4oz.SKU: AI1108-EAManufacturer: Apera Instruments8oz pH Calibration Buffer Solution Kit (pH 4.00 & 7.00), 4oz plus storage solution for pH/ORP Electrodes High Accuracy (±0.01 pH): standardized against NIST certified pH references within 0.01 pH at 25°C (77°F). Ideal for the calibration of all kinds of p (1 per EA )Learn Morewas $28.00 Special Price $24.19 -
pH Calibration Solution Kit, 7.00, 4.00, 10.01, 8oz., Storage solution 4oz.SKU: AI1109-EAManufacturer: Apera Instruments8oz pH Calibration Buffer Solution Kit (pH 4.00, 7.00 & 10.01), plus 4oz storage solution for pH/ORP Electrodes High Accuracy (±0.01 pH): standardized against NIST certified pH references within 0.01 pH at 25°C (77°F). Ideal for the calibration of all kin (1 per EA )Learn Morewas $33.00 Special Price $28.51 -
pH 10.01 Calibration Buffer Solution 8 ozSKU: AI1103-EAManufacturer: Apera InstrumentspH 10.01 Calibration Buffer Solution 8 oz, 0.01 pH Accuracy at 25°C (77°F) High Accuracy (±0.01 pH): standardized against NIST certified pH references within 0.01 pH at 25°C (77°F). Ideal for the calibration of all kinds of pH meters/tester Color-coded, D (1 per EA )Learn Morewas $11.00 Special Price $9.50 -
1M LiCl Electrolyte Refill Solution 8 oz.SKU: AI1172-EAManufacturer: Apera InstrumentsMade with high-purity chemicals, the 1M LiCl in Ethanol Reference Solution is used for the reference electrolyte refill of pH electrodes for organic solvents and non-aqueous solutions. (1 per EA )Learn Morewas $33.00 Special Price $28.51 -
pH 7.00 Calibration Buffer Solution 8 ozSKU: AI1101-EAManufacturer: Apera InstrumentspH 7.00 Calibration Buffer Solution 8 oz, 0.01 pH Accuracy at 25°C (77°F) High Accuracy (±0.01 pH): standardized against NIST certified pH references within 0.01 pH at 25°C (77°F). Ideal for the calibration of all kinds of pH meters/testers Color-coded, D (1 per EA )Learn Morewas $11.00 Special Price $9.50 -
pH 4.00 Calibration Buffer Solution 8 ozSKU: AI1102-EAManufacturer: Apera InstrumentspH 4.00 Calibration Buffer Solution 8 oz, 0.01 pH Accuracy at 25°C (77°F) High Accuracy (±0.01 pH): standardized against NIST certified pH references within 0.01 pH at 25°C (77°F). Ideal for the calibration of all kinds of pH meters/testers Color-coded, D (1 per EA )Learn Morewas $11.00 Special Price $9.50 -
Total Ionic Strength Adjustment Buffer D for Potassium/Ammonium Ion Electrodes (8 oz)SKU: AI4630-EAManufacturer: Apera InstrumentsTotal Ionic Strength Adjustment Buffer D for Potassium/Ammonium Ion Electrodes (8 oz) (1 per EA )Learn Morewas $35.00 Special Price $30.24 -
pH 1.68 Calibration Buffer Solution 16ozSKU: AI1121-L-EAManufacturer: Apera InstrumentspH 1.68 Calibration Buffer Solution 16oz (1 per EA )Learn Morewas $28.00 Special Price $24.19 -
AMCO 0.0NTU Standard Calibration Solution 250mlSKU: AI4206-L-EAManufacturer: Apera InstrumentsAMCO 0.0NTU Standard Calibration Solution 250ml (1 per EA )Learn Morewas $89.00 Special Price $76.90 -
Total Ionic Strength Adjustment Buffer B for Fluoride Ion Electrodes (8 oz)SKU: AI4616-EAManufacturer: Apera InstrumentsTotal Ionic Strength Adjustment Buffer B for Fluoride Ion Electrodes (8 oz) (1 per EA )Learn Morewas $35.00 Special Price $30.24 -
pH 12.46 Calibration Buffer Solution 16ozSKU: AI1123-L-EAManufacturer: Apera InstrumentspH 12.46 Calibration Buffer Solution 16oz (1 per EA )Learn Morewas $28.00 Special Price $24.19 -
Total Ionic Strength Adjustment Buffer C for Chloride/Bromide/Iodide/Copper Ion Electrodes (8 oz)SKU: AI4623-EAManufacturer: Apera InstrumentsTotal Ionic Strength Adjustment Buffer C for Chloride/Bromide/Iodide/Copper Ion Electrodes (8 oz) (1 per EA )Learn Morewas $35.00 Special Price $30.24 - Total Ionic Strength Adjustment Buffer A for Calcium Ion Electrodes (8 oz)SKU: AI4609-EAManufacturer: Apera InstrumentsTotal Ionic Strength Adjustment Buffer A for Calcium Ion Electrodes (8 oz) (1 per EA )Learn Morewas $35.00 Special Price $30.24
- Total Ionic Strength Adjustment Buffer E for Nitrate Ion Electrodes (8 oz)SKU: AI4647-EAManufacturer: Apera InstrumentsTotal Ionic Strength Adjustment Buffer E for Nitrate Ion Electrodes (8 oz) (1 per EA )Learn Morewas $35.00 Special Price $30.24
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