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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Water Hardness Indicator, Mod, 500.00 mL Glass amberSKU: CW200600-500C-EAManufacturer: Reagents IncWater Hardness Indicator, Mod, 500.00 mL Glass amber (1 per EA )Learn Morewas $89.00 Special Price $68.47 - Thymolphthalein, 0.05%/90% SDA, 120.00 mL Poly naturalSKU: CT120000-120A-EAManufacturer: Reagents IncThymolphthalein, 0.05%/90% SDA, 120.00 mL Poly natural (1 per EA )Learn Morewas $39.50 Special Price $30.38
- Sodium Silicate, 42° Baume, 4.00 L Poly naturalSKU: C2325000-4A-EAManufacturer: Reagents IncSodium Silicate, 42° Baume, 4.00 L Poly natural (1 per EA )Learn Morewas $78.00 Special Price $58.32
- Beraha's Sulfamic Acid Rgt #4, 500.00 mL Poly naturalSKU: CB004600-500A-EAManufacturer: Reagents IncBeraha's Sulfamic Acid Rgt #4, 500.00 mL Poly natural (1 per EA )Learn Morewas $70.50 Special Price $52.92
- Sulfamic Acid, 15% w/w, 4.00 L Poly naturalSKU: C7114300-4A-EAManufacturer: Reagents IncSulfamic Acid, 15% w/w, 4.00 L Poly natural (1 per EA )Learn Morewas $72.00 Special Price $54.00
- Sodium Hydroxide, 150 mM, 100.00 mL Poly naturalSKU: CS008900-100A-EAManufacturer: Reagents IncSodium Hydroxide, 150 mM, 100.00 mL Poly natural (1 per EA )Learn Morewas $103.00 Special Price $77.76
- Sodium Thiosulfate, 20% w/v, 500.00 mL Glass amberSKU: CS127500-500C-EAManufacturer: Reagents IncSodium Thiosulfate, 20% w/v, 500.00 mL Glass amber (1 per EA )Learn Morewas $88.00 Special Price $65.88
- Trifluoroacetic Acid, 500.00 mL EachSKU: C2342660-500X-EAManufacturer: Reagents IncTrifluoroacetic Acid, 500.00 mL Each (1 per EA )Learn Morewas $264.00 Special Price $197.64
- Potassium Chloride, 3 M (3 N), 250.00 mL Poly naturalSKU: CP183000-250A-EAManufacturer: Reagents IncPotassium Chloride, 3 M (3 N), 250.00 mL Poly natural (1 per EA )Learn Morewas $41.50 Special Price $31.32
- Isopropanol, 40% v/v HPLC, 4.00 L Glass amberSKU: CI298000-4C-EAManufacturer: Reagents IncIsopropanol, 40% v/v HPLC, 4.00 L Glass amber (1 per EA )Learn Morewas $153.00 Special Price $114.48
- Phosphoric Acid, 0.1% HPLC, 4.00 L Glass amberSKU: CP106200-4C-EAManufacturer: Reagents IncPhosphoric Acid, 0.1% HPLC, 4.00 L Glass amber (1 per EA )Learn Morewas $90.00 Special Price $68.04
- Acetonitrile, 44% v/v HPLC, 4.00 L Glass amberSKU: CA108100-4C-EAManufacturer: Reagents IncAcetonitrile, 44% v/v HPLC, 4.00 L Glass amber (1 per EA )Learn Morewas $325.00 Special Price $244.08
- Buffer, pH 6.00, 500.00 mL Poly naturalSKU: C2155550-500A-EAManufacturer: Reagents IncBuffer, pH 6.00, 500.00 mL Poly natural (1 per EA )Learn Morewas $29.00 Special Price $21.60
- Silver Nitrate, 0.0171 N, 4.00 L Glass amberSKU: CS003900-4C-EAManufacturer: Reagents IncSilver Nitrate, 0.0171 N, 4.00 L Glass amber (1 per EA )Learn Morewas $209.00 Special Price $156.60
- Sulfuric Acid, 93% (66° Baume), 500.00 mL Poly naturalSKU: C5102700-500A-EAManufacturer: Reagents IncSulfuric Acid, 93% (66° Baume), 500.00 mL Poly natural (1 per EA )Learn Morewas $39.00 Special Price $29.16
- Buffer, pH 10.00, Blue, 100.00 mL Single ShotSKU: C2156500-100S-EAManufacturer: Reagents IncBuffer, pH 10.00, Blue, 100.00 mL Single Shot (1 per EA )Learn Morewas $12.00 Special Price $8.64
- Acrylamide Solution 100 ppm, 500.00 mL Glass amberSKU: CA017200-500C-EAManufacturer: Reagents IncAcrylamide Solution 100 ppm, 500.00 mL Glass amber (1 per EA )Learn Morewas $92.00 Special Price $69.12
- Phosphate Buffer, pH 7, D1094, 1.00 L Poly naturalSKU: CP211500-1A-EAManufacturer: Reagents IncPhosphate Buffer, pH 7, D1094, 1.00 L Poly natural (1 per EA )Learn Morewas $99.00 Special Price $74.52
- Calcium Carbonate, 0.02 M, 4.00 L Glass amberSKU: CC203500-4C-EAManufacturer: Reagents IncCalcium Carbonate, 0.02 M, 4.00 L Glass amber (1 per EA )Learn Morewas $279.00 Special Price $209.52
- Oxalic Acid, 0.1 N (0.05 M), 4.00 L Poly naturalSKU: CO100000-4A-EAManufacturer: Reagents IncOxalic Acid, 0.1 N (0.05 M), 4.00 L Poly natural (1 per EA )Learn Morewas $257.00 Special Price $192.24
- Aluminum Sulfate, 0.05 M, 4.00 L Poly naturalSKU: CA011800-4A-EAManufacturer: Reagents IncAluminum Sulfate, 0.05 M, 4.00 L Poly natural (1 per EA )Learn Morewas $91.00 Special Price $68.04
- 1,10-Phenanthroline, 0.3% w/v, 20.00 L CubitainerSKU: CP121800-20F-EAManufacturer: Reagents Inc1,10-Phenanthroline, 0.3% w/v, 20.00 L Cubitainer (1 per EA )Learn Morewas $563.00 Special Price $422.28
- Hydrochloric Acid, 10% w/w, 1.00 L Poly naturalSKU: CH101000-1A-EAManufacturer: Reagents IncHydrochloric Acid, 10% w/w, 1.00 L Poly natural (1 per EA )Learn Morewas $45.50 Special Price $34.56
- Ammonium Hydroxide, 10% v/v, 1.00 L Poly naturalSKU: CA011500-1A-EAManufacturer: Reagents IncAmmonium Hydroxide, 10% v/v, 1.00 L Poly natural (1 per EA )Learn Morewas $77.00 Special Price $57.24
- Manufacturer Reagents Inc Remove This Item
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