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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Methoxyphenylacetic TS - 500mLSKU: TS14166-500ml-EAManufacturer: Dawn ScientificMethoxyphenylacetic TS - 500mL (1 per EA )Learn Morewas $154.62 Special Price $150.76 -
Silver Nitrate 0.282 N, 4.00 L CubitainerSKU: CS150800-4F-EAManufacturer: Reagents IncSilver Nitrate 0.282 N, 4.00 L Cubitainer (1 per EA )Learn Morewas $2,150.00 Special Price $1,612.44 -
Hypophosphorous Acid, 30 Percent (w/v) Solution (DEA List I Chemical), 500mL, CAS# 6303-21-5SKU: H1100-4LTPV-EAManufacturer: Spectrum ChemicalHypophosphorous Acid, 30 Percent (w/v) Solution (DEA List I Chemical) - 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 $1,933.90 Special Price $1,592.91 - Carboxymethylcellulose Sodium, High Viscosity, Viscosity of 1 Percent Aqueous Solution @ 25 DEG C: 1500-3000 cP, USP4-32-4SKU: CA194-12KG-EAManufacturer: Spectrum ChemicalCarboxymethylcellulose Sodium, High Viscosity, Viscosity of 1 Percent Aqueous Solution @ 25 DEG C: 1500-3000 cP, USP is often used as a thickener and stabilizer. All Spectrum Chemical USP grade products are manufactured, packaged and stored under current Good Manufacturing Practices (cGMP). (1 per EA)Learn Morewas $3,726.15 Special Price $3,307.60
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4L Yellow Buffer Solution pH 7.0 @ 25°C, Poly BottleSKU: MSIB2287-4L-EAManufacturer: Midland Scientific4L Yellow Buffer Solution pH 7.0 @ 25°C, Poly Bottle (1 per EA )Learn Morewas $29.44 Special Price $24.75 - 10L Blue Buffer Solution pH 10.0 @ 25°C, CubitainerSKU: MSIB2281-10L-EAManufacturer: Midland Scientific10L Blue Buffer Solution pH 10.0 @ 25°C, Cubitainer (1 per EA )Learn More$102.77
- Alkaline Cupric Citrate TS - 1LSKU: TS14016-1L-EAManufacturer: Dawn ScientificAlkaline Cupric Citrate TS - 1L (1 per EA )Learn Morewas $389.62 Special Price $379.88
- Ceric Ammonium Nitrate TS - 1LSKU: TS14070-1L-EAManufacturer: Dawn ScientificCeric Ammonium Nitrate TS - 1L (1 per EA )Learn Morewas $259.62 Special Price $253.13
- Cupric Acetate TS, Sronger - 1LSKU: TS14082-1L-EAManufacturer: Dawn ScientificCupric Acetate TS, Sronger - 1L (1 per EA )Learn Morewas $274.62 Special Price $267.75
- Cupric Citrate TS, Alkaline - 1LSKU: TS14085-1L-EAManufacturer: Dawn ScientificCupric Citrate TS, Alkaline - 1L (1 per EA )Learn Morewas $344.62 Special Price $336.01
- Erichrome Black TS - 1LSKU: TS14107-1L-EAManufacturer: Dawn ScientificErichrome Black TS - 1L (1 per EA )Learn Morewas $214.62 Special Price $209.25
- Sulfomolybic Acid TS - 1LSKU: TS14284-1L-EAManufacturer: Dawn ScientificSulfomolybic Acid TS - 1L (1 per EA )Learn Morewas $244.62 Special Price $238.51
- Lead Acetate TS - 1LSKU: TS14143-1L-EAManufacturer: Dawn ScientificLead Acetate TS - 1L (1 per EA )Learn Morewas $194.62 Special Price $189.76
- Phenol Red TS, ( Alcoholic) - 1LSKU: TS14198-1L-EAManufacturer: Dawn ScientificPhenol Red TS, ( Alcoholic) - 1L (1 per EA )Learn Morewas $194.62 Special Price $189.76
- Potassium Iodide TS - 1LSKU: TS14222-1L-EAManufacturer: Dawn ScientificPotassium Iodide TS - 1L (1 per EA )Learn Morewas $169.62 Special Price $165.38
- Potassium Thiocyanate TS - 1LSKU: TS14228-1L-EAManufacturer: Dawn ScientificPotassium Thiocyanate TS - 1L (1 per EA )Learn Morewas $169.62 Special Price $165.38
- Saline TS - 1LSKU: TS14235-1L-EAManufacturer: Dawn ScientificSaline TS - 1L (1 per EA )Learn Morewas $139.62 Special Price $136.13
- Sodium Acetate TS - 1LSKU: TS14244-1L-EAManufacturer: Dawn ScientificSodium Acetate TS - 1L (1 per EA )Learn Morewas $99.62 Special Price $97.12
- Starch TS - 1LSKU: TS14273-1L-EAManufacturer: Dawn ScientificStarch TS - 1L (1 per EA )Learn Morewas $199.62 Special Price $194.63
- Thioacetamide TS - 1LSKU: TS14291-1L-EAManufacturer: Dawn ScientificThioacetamide TS - 1L (1 per EA )Learn Morewas $119.62 Special Price $116.63
- Thymol Blue TS - 1LSKU: TS14294-1L-EAManufacturer: Dawn ScientificThymol Blue TS - 1L (1 per EA )Learn Morewas $189.62 Special Price $184.87
- Hexamethylenetetramine TS - 100mLSKU: TS14307-100ml-EAManufacturer: Dawn ScientificHexamethylenetetramine TS - 100mL (1 per EA )Learn Morewas $79.62 Special Price $77.63
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Nitric Acid, 25% v/v Solution, 2.2 L, 6/case, PolySKU: N1043-2.2L(6cs)-EAManufacturer: 710 Spirits Rocky Mtn ReagentsNitric Acid, 25% v/v Solution, 2.2 L, 6/case, Poly (1 per EA )Learn More$296.30 - Sodium Hydroxide, 50 Percent (w/w), Solution, Reagent, 200L, CAS# 1310-73-2SKU: S1310-200LTBL-EAManufacturer: Spectrum ChemicalSodium Hydroxide, 50 Percent (w/w), Solution, Reagent is commonly known as Caustic soda. This inorganic compound is water soluble, as well as in ethanol and methanol. The dissolution of solid Sodium Hydroxide in water creates a highly exothermic reaction. The concentrated solution is suitable for further dilution or as a raw material feedstock in chemical synthetic transformations. As a Reagent grade item, Spectrum Chemical manufactured Sodium Hydroxide met the toughest regulatory standards for quality and purity. (1 per EA )Learn More$2,448.75
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