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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Zinc Sulfate, 0.05 M, 1.00 L Poly naturalSKU: CZ000600-1A-EAManufacturer: Reagents IncZinc Sulfate, 0.05 M, 1.00 L Poly natural (1 per EA )Learn Morewas $102.00 Special Price $78.47 - Magnesium Sulfate, 2.25% w/v, 500.00 mL Poly naturalSKU: C7240000-500A-EAManufacturer: Reagents IncMagnesium Sulfate, 2.25% w/v, 500.00 mL Poly natural (1 per EA )Learn Morewas $27.00 Special Price $20.52
- Sodium Persulfate, 1.5 M, 20.00 L Winpak blueSKU: CS158500-20E7-EAManufacturer: Reagents IncSodium Persulfate, 1.5 M, 20.00 L Winpak blue (1 per EA )Learn Morewas $332.00 Special Price $249.48
- Pot Hydroxide, 0.05 N /Rgt Alc, 1.00 L Poly naturalSKU: CP109100-1A-EAManufacturer: Reagents IncPot Hydroxide, 0.05 N /Rgt Alc, 1.00 L Poly natural (1 per EA )Learn Morewas $62.00 Special Price $46.44
- Hydrochloric Acid, 0.1% v/v, 200.00 L DrumSKU: CH001500-200E-EAManufacturer: Reagents IncHydrochloric Acid, 0.1% v/v, 200.00 L Drum (1 per EA )Learn Morewas $1,090.00 Special Price $817.56
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Midget, Chlorine OT, 5-250 ppmSKU: 5521-EAManufacturer: Taylor TechnologiesMidget, Chlorine OT, 5-250 ppm (1 per EA )Learn Morewas $1.04 Special Price $0.93 -
Bromocresol Blue TS - 500mLSKU: TS14060-500ml-EAManufacturer: Dawn ScientificBromocresol Blue TS - 500mL (1 per EA )Learn Morewas $64.62 Special Price $63.01 - Zinc Chloride, Saturated, 4.00 L Poly naturalSKU: CZ001900-4A-EAManufacturer: Reagents IncZinc Chloride, Saturated, 4.00 L Poly natural (1 per EA )Learn Morewas $390.00 Special Price $300.03
- Zircaloy 2 Etchant, 500.00 mL Poly naturalSKU: CZ140200-500A-EAManufacturer: Reagents IncZircaloy 2 Etchant, 500.00 mL Poly natural (1 per EA )Learn Morewas $173.00 Special Price $133.09
- Villella's Etch, 1% / Ethanol, 250.00 mL Glass amberSKU: CV200200-250C-EAManufacturer: Reagents IncVillella's Etch, 1% / Ethanol, 250.00 mL Glass amber (1 per EA )Learn Morewas $74.00 Special Price $56.92
- Potassium Chloride, 4 M w/AgCl, 120.00 mL Poly naturalSKU: CP007400-120A-EAManufacturer: Reagents IncPotassium Chloride, 4 M w/AgCl, 120.00 mL Poly natural (1 per EA )Learn Morewas $29.00 Special Price $21.60
- Sulfuric Acid, 3.2 N, 4.00 L Poly naturalSKU: CS204500-4A-EAManufacturer: Reagents IncSulfuric Acid, 3.2 N, 4.00 L Poly natural (1 per EA )Learn Morewas $88.00 Special Price $65.88
- Sodium Hydroxide, 0.03 N, 4.00 L Poly naturalSKU: CS131200-4A-EAManufacturer: Reagents IncSodium Hydroxide, 0.03 N, 4.00 L Poly natural (1 per EA )Learn Morewas $66.00 Special Price $49.68
- Sulfuric Acid, 0.04 N, 4.00 L Poly naturalSKU: CS133200-4A-EAManufacturer: Reagents IncSulfuric Acid, 0.04 N, 4.00 L Poly natural (1 per EA )Learn Morewas $126.00 Special Price $95.04
- M-Cresol Purple TS - 500mLSKU: TS14077-500ml-EAManufacturer: Dawn ScientificM-Cresol Purple TS - 500mL (1 per EA )Learn Morewas $47.62 Special Price $46.43
- Neutral Red TS - 500mLSKU: TS14187-500ml-EAManufacturer: Dawn ScientificNeutral Red TS - 500mL (1 per EA )Learn Morewas $61.62 Special Price $60.08
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Vario Glycine Reagent, 10%, 125 ML, Ea/1SKU: R-5011-7-EAManufacturer: Lovibond Tintometer GroupLovibond Vario Glycine Reagent, 10%, 125 ml (1 per EA)Learn More$28.60 -
Vario Aluminum Masking Reagent 25 ML, Ea/1SKU: 531625-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 2380123. Lovibond VARIO ECR Masking Reagent Solution, 25 ml As a rule, liquid reagents do not consist of a single preparation but comprise several components that need to be added to the sample in a certain order. As both (1 per EA)Learn More$21.70 -
Vario Cu1, F10 1000 PackSKU: 530303-PKManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 2105828. Lovibond VARIO Cu1, F10, 1000 Pack The fast and easy use of VARIO Powder Packs has made them extremely popular for water testing applications in many countries throughout the world. The Lovibond Powder Pack progr (1000 per PK )Learn More$560.20 -
Vario Dpd Total, F5 1000 Pack, Ea/1SKU: 530083-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 1407628. (1 per EA )Learn More$208.31 - Potassium Hydroxide, 0.5 N, 4.00 L Poly naturalSKU: CP119300-4A-EAManufacturer: Reagents IncPotassium Hydroxide, 0.5 N, 4.00 L Poly natural (1 per EA )Learn Morewas $134.00 Special Price $100.44
- Slide, Bromine DPD, 2.0-10 ppmSKU: 5517-EAManufacturer: Taylor TechnologiesSlide, Bromine DPD, 2.0-10 ppm (1 per EA )Learn Morewas $1.04 Special Price $0.93
- Acetate Buffer pH 4.0 APHA, 10.00 L CubitainerSKU: CA016400-10F-EAManufacturer: Reagents IncAcetate Buffer pH 4.0 APHA, 10.00 L Cubitainer (1 per EA )Learn Morewas $336.00 Special Price $251.64
- Sodium Thiosulfate 10% w/v, 1.00 L Poly naturalSKU: CS137500-1A-EAManufacturer: Reagents IncSodium Thiosulfate 10% w/v, 1.00 L Poly natural (1 per EA )Learn Morewas $51.00 Special Price $37.80
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