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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Bromocresol Green TS - 100mLSKU: TS14061-100ml-EAManufacturer: Dawn ScientificBromocresol Green TS - 100mL (1 per EA )Learn Morewas $29.62 Special Price $28.88 - Potassium Carbonate TS - 500mLSKU: TS14214-500ml-EAManufacturer: Dawn ScientificPotassium Carbonate TS - 500mL (1 per EA )Learn Morewas $99.62 Special Price $97.12
- Bromocresol Green TS - 500mLSKU: TS14061-500ml-EAManufacturer: Dawn ScientificBromocresol Green TS - 500mL (1 per EA )Learn Morewas $45.62 Special Price $44.47
- Acetic Acid, strong, TS - 500mLSKU: TS14003-500ml-EAManufacturer: Dawn ScientificAcetic Acid, strong, TS - 500mL (1 per EA )Learn Morewas $69.62 Special Price $67.88
- Quinone TS - 500mLSKU: TS14232-500ml-EAManufacturer: Dawn ScientificQuinone TS - 500mL (1 per EA )Learn Morewas $144.62 Special Price $141.00
- Bromophenol Blue TS - 500mLSKU: TS14064-500ml-EAManufacturer: Dawn ScientificBromophenol Blue TS - 500mL (1 per EA )Learn Morewas $129.62 Special Price $126.38
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VB E (EDTA Titrant 0.01 M), 1.00 L Poly naturalSKU: C8310300-1A-EAManufacturer: Reagents IncVB E (EDTA Titrant 0.01 M), 1.00 L Poly natural (1 per EA )Learn Morewas $165.00 Special Price $124.20 - Indicator A, 1.00 L Poly naturalSKU: C84030NE-1A-EAManufacturer: Reagents IncIndicator A, 1.00 L Poly natural (1 per EA )Learn Morewas $140.00 Special Price $104.76
- Potassium Iodide 10% w/w, 4.00 L Opaque polySKU: CP195600-4QP-EAManufacturer: Reagents IncPotassium Iodide 10% w/w, 4.00 L Opaque poly (1 per EA )Learn Morewas $270.00 Special Price $203.04
- Potassium Dichromate 2% w/v, 1.00 L Poly naturalSKU: CP204000-1A-EAManufacturer: Reagents IncPotassium Dichromate 2% w/v, 1.00 L Poly natural (1 per EA )Learn Morewas $116.00 Special Price $87.48
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Buffer Solution, pHospHate-Chlorine, Mercury-Free, 4L, Poly BottleSKU: LC185454-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $234.50 Special Price $175.88 -
Nitric Acid, 20 Percent (w/v) Aqueous Solution, 2.5L, CAS# 7697-37-2SKU: N-170-2.5LTPV-EAManufacturer: Spectrum ChemicalNitric Acid, 20 Percent (w/v) Aqueous Solution - Ungraded products supplied by Spectrum are indicative of a grade suitable for general industrial use or research purposes and typically are not suitable for human consumption or therapeutic use. (1 per EA )Learn Morewas $179.90 Special Price $146.37 - Sulfuric Acid, 1.00 N Solution, APHA, 1L, CAS# 7664-93-9SKU: S-630-1LT-EAManufacturer: Spectrum ChemicalSulfuric Acid, 1.00 N Solution, APHA - As an APHA certified solution, this item is meets the ASTM D1209 standards and can be used in water and waste water treatment facilities to determine the concentration of dissolved and particulate materials. Spectrum Chemical manufactured APHA grade products meet the toughest regulatory standards for quality and purity. (1 per EA )Learn Morewas $69.25 Special Price $56.35
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250mL Red Buffer Solution pH 4.0 @ 25°C, Poly BottleSKU: MSIB2283-250ML-EAManufacturer: Midland Scientific250mL Red Buffer Solution pH 4.0 @ 25°C, Poly Bottle (1 per EA )Learn Morewas $9.32 Special Price $7.59 - Alkaline Sodium Hydrosulphite TS - 1LSKU: TS14022-1L-EAManufacturer: Dawn ScientificAlkaline Sodium Hydrosulphite TS - 1L (1 per EA )Learn Morewas $239.62 Special Price $233.63
- Aminonaphthol sulfonic Acid TS - 1LSKU: TS14024-1L-EAManufacturer: Dawn ScientificAminonaphthol sulfonic Acid TS - 1L (1 per EA )Learn Morewas $269.62 Special Price $262.88
- Ammonium Molybdate TS - 1LSKU: TS14038-1L-EAManufacturer: Dawn ScientificAmmonium Molybdate TS - 1L (1 per EA )Learn Morewas $284.62 Special Price $277.51
- Magnsia Mixture TS - 1LSKU: TS14150-1L-EAManufacturer: Dawn ScientificMagnsia Mixture TS - 1L (1 per EA )Learn Morewas $239.62 Special Price $233.63
- Mercuric Sulfate TS (Denig`es' Reagent) - 1LSKU: TS14162-1L-EAManufacturer: Dawn ScientificMercuric Sulfate TS (Denig`es' Reagent) - 1L (1 per EA )Learn Morewas $319.62 Special Price $311.63
- Potassium Iodoplatinate TS - 50mLSKU: TS14224-50ml-EAManufacturer: Dawn ScientificPotassium Iodoplatinate TS - 50mL (1 per EA )Learn Morewas $339.62 Special Price $331.13
- Bromocresol Green TS - 1LSKU: TS14061-1L-EAManufacturer: Dawn ScientificBromocresol Green TS - 1L (1 per EA )Learn Morewas $79.62 Special Price $77.63
- Sodium Bitartrate TS - 100mLSKU: TS14248-100ml-EAManufacturer: Dawn ScientificSodium Bitartrate TS - 100mL (1 per EA )Learn Morewas $79.62 Special Price $77.63
- 5 mg/ml of thymol in a mixture of alcohol and sulfuric acid - 100mLSKU: TS14304-100ml-EAManufacturer: Dawn Scientific5 mg/ml of thymol in a mixture of alcohol and sulfuric acid - 100mL (1 per EA )Learn Morewas $99.62 Special Price $97.12
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Vario Sulfate 4 Reagent, F25 1000 Pack, Ea/1SKU: 532153-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 1206528. (1 per EA )Learn More$353.60
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