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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Buffer, pH 8.00, 4.00 L Poly naturalSKU: C2156100-4A-EAManufacturer: Reagents IncBuffer, pH 8.00, 4.00 L Poly natural (1 per EA )Learn Morewas $96.00 Special Price $72.36 - Acetic Acid, 0.25% w/w, 4.00 L Poly naturalSKU: CA100500-4A-EAManufacturer: Reagents IncAcetic Acid, 0.25% w/w, 4.00 L Poly natural (1 per EA )Learn Morewas $168.00 Special Price $126.36
- Sulfuric Acid 70% w/w Textile, 55.00 gal DrumSKU: C7306600-55E-EAManufacturer: Reagents IncSulfuric Acid 70% w/w Textile, 55.00 gal Drum (1 per EA )Learn Morewas $1,170.00 Special Price $878.04
- Potassium Chloride, 3.3 M Unst, 500.00 mL Poly naturalSKU: CP183500-500A-EAManufacturer: Reagents IncPotassium Chloride, 3.3 M Unst, 500.00 mL Poly natural (1 per EA )Learn Morewas $67.50 Special Price $50.76
- IPA/Hexane, 46:54 w/w, 200.00 L DRUM, METALSKU: CI171400-200L-EAManufacturer: Reagents IncIPA/Hexane, 46:54 w/w, 200.00 L DRUM, METAL (1 per EA )Learn Morewas $2,530.00 Special Price $1,897.56
- Sulfamic Acid Technical, 500.00 g wide mouthSKU: C2114333-500A5-EAManufacturer: Reagents IncSulfamic Acid Technical, 500.00 g wide mouth (1 per EA )Learn Morewas $59.00 Special Price $44.28
- FFA Neutralized Alcohol, 1.00 L Poly naturalSKU: CN102400-1A-EAManufacturer: Reagents IncFFA Neutralized Alcohol, 1.00 L Poly natural (1 per EA )Learn Morewas $74.00 Special Price $55.08
- Hydrochloric Acid, 1 N w/X-100, 20.00 L Winpak blueSKU: CH120100-20E2-EAManufacturer: Reagents IncHydrochloric Acid, 1 N w/X-100, 20.00 L Winpak blue (1 per EA )Learn Morewas $237.00 Special Price $178.20
- Murexide Ind, 0.25% in Sucrose, 250.00 g Glass amb wmSKU: CM040000-250C2-EAManufacturer: Reagents IncMurexide Ind, 0.25% in Sucrose, 250.00 g Glass amb wm (1 per EA )Learn Morewas $129.00 Special Price $97.20
- Iodine Solution, 0.3% / 1% KI, 1.00 L Glass amberSKU: CI202700-1C-EAManufacturer: Reagents IncIodine Solution, 0.3% / 1% KI, 1.00 L Glass amber (1 per EA )Learn Morewas $175.00 Special Price $131.76
- Sodium Hydroxide, 0.1142 N, 1.00 L Poly naturalSKU: CS107200-1A-EAManufacturer: Reagents IncSodium Hydroxide, 0.1142 N, 1.00 L Poly natural (1 per EA )Learn Morewas $51.00 Special Price $37.80
- Sodium Thiosulfate, 0.2 N, 500.00 mL Poly naturalSKU: C7328010-500A-EAManufacturer: Reagents IncSodium Thiosulfate, 0.2 N, 500.00 mL Poly natural (1 per EA )Learn Morewas $29.00 Special Price $21.60
- Fehling's Alkaline Solution B, 1.00 L Poly naturalSKU: C7202500-1A-EAManufacturer: Reagents IncFehling's Alkaline Solution B, 1.00 L Poly natural (1 per EA )Learn Morewas $83.00 Special Price $62.64
- Acetic Acid / Isooctane 60:40, 4.00 L Poly naturalSKU: CA100700-4A-EAManufacturer: Reagents IncAcetic Acid / Isooctane 60:40, 4.00 L Poly natural (1 per EA )Learn Morewas $429.00 Special Price $321.84
- Perchloric Acid, 0.154 N / GAA, 2.50 L Glass clearSKU: CP120500-2.5D1-EAManufacturer: Reagents IncPerchloric Acid, 0.154 N / GAA, 2.50 L Glass clear (1 per EA )Learn Morewas $138.00 Special Price $103.68
- Nitric Acid, 30% v/v, 2.50 L Glass clearSKU: CN200900-2.5D1-EAManufacturer: Reagents IncNitric Acid, 30% v/v, 2.50 L Glass clear (1 per EA )Learn Morewas $205.00 Special Price $153.36
- Calcium Chloride, 58% w/w, 2.50 L Glass clearSKU: CC202900-2.5D1-EAManufacturer: Reagents IncCalcium Chloride, 58% w/w, 2.50 L Glass clear (1 per EA )Learn Morewas $204.00 Special Price $153.36
- Perchloric Acid, 2 N, 1.00 L Glass amberSKU: CP121300-1C-EAManufacturer: Reagents IncPerchloric Acid, 2 N, 1.00 L Glass amber (1 per EA )Learn Morewas $95.00 Special Price $71.28
- Calcium Nitrate, 10% w/v, 4.00 L Poly naturalSKU: CC203600-4A-EAManufacturer: Reagents IncCalcium Nitrate, 10% w/v, 4.00 L Poly natural (1 per EA )Learn Morewas $228.00 Special Price $170.64
- Sulfuric Acid, 20% w/v, 20.00 L Winpak blueSKU: CS101700-20E7-EAManufacturer: Reagents IncSulfuric Acid, 20% w/v, 20.00 L Winpak blue (1 per EA )Learn Morewas $291.00 Special Price $218.16
- Nitric Acid, 0.25 N, 1.00 L Poly naturalSKU: CN206500-1A-EAManufacturer: Reagents IncNitric Acid, 0.25 N, 1.00 L Poly natural (1 per EA )Learn Morewas $45.50 Special Price $34.56
- Acetate Buffer pH 3.5, 1.00 L Poly naturalSKU: CA102300-1A-EAManufacturer: Reagents IncAcetate Buffer pH 3.5, 1.00 L Poly natural (1 per EA )Learn Morewas $267.00 Special Price $199.80
- Potassium Fluoride, 25% w/w, 4.00 L Poly naturalSKU: CP201300-4A-EAManufacturer: Reagents IncPotassium Fluoride, 25% w/w, 4.00 L Poly natural (1 per EA )Learn Morewas $274.00 Special Price $205.20
- Pot Permanganate, 89.1 mg/L, 500.00 mL Glass amberSKU: CP240000-500C-EAManufacturer: Reagents IncPot Permanganate, 89.1 mg/L, 500.00 mL Glass amber (1 per EA )Learn Morewas $48.00 Special Price $35.64
- Manufacturer Reagents Inc Remove This Item
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