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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Sulfuric Acid, 10.0N (5.0M), 1L, Poly BottleSKU: LC258702-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2796 (1 per EA)Learn Morewas $77.20 Special Price $59.39 -
Reagent Alcohol, 500ML, Poly BottleSKU: LC222001-EAManufacturer: LabChemShelf Life (months): , , UN Number: UN1987 (1 per EA)Learn Morewas $45.70 Special Price $34.28 -
Buffer Solution, pH 4.01 +/- 0.01 @ 25 DEG C, Reference StandardSKU: B1160-500MLPL-EAManufacturer: Spectrum ChemicalBuffer Solution, pH 4.01 +/- 0.01 @ 25 DEG C, Reference Standard (1 per EA )Learn Morewas $65.95 Special Price $53.65 -
New Methylene Blue, 0.5% w/v with 1.6% w/v Potassium Oxalate, 120 mLSKU: N1007-120mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsNew Methylene Blue, 0.5% w/v with 1.6% w/v Potassium Oxalate, 120 mL (1 per EA)Learn More$23.30 -
Sodium Chloride 5M Solution, 500 MillilitersSKU: S24600-500.0-EAManufacturer: Research Products InternationalDimensions: 2.75 x 6.75 x 2.75 Weight: 0.27 - Research or further manufacturing use only, not for food or drug use. (1 per EA)Learn More$64.15 -
Sulfuric Acid, 3 N, 1.00 L Poly naturalSKU: CS203100-1A-EAManufacturer: Reagents IncSulfuric Acid, 3 N, 1.00 L Poly natural (1 per EA )Learn Morewas $46.50 Special Price $35.77 -
Bromocresol Green-Methyl Red (Alc), 125ML, White PolySKU: LC118807-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: UN1170 (1 per EA)Learn Morewas $67.00 Special Price $50.25 -
Buffer Solution pH 7.70, 20L, Cubitainer®SKU: LC124105-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $403.60 Special Price $302.70 -
Phenolphthalein, 0.5 Percent (w/v) Indicator Solution in 50 Percent Alcohol, APHASKU: P-150-4LTPL-EAManufacturer: Spectrum ChemicalPhenolphthalein, 0.5 Percent (w/v) Indicator Solution in 50 Percent Alcohol, APHA - As an APHA certified solution, this item meets the ASTM D1209 standards for use 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 $139.80 Special Price $134.44 - Formaldehyde, 10% v/v Solution, 1 LSKU: F1010-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsFormaldehyde, 10% v/v Solution, 1 L (1 per EA)Learn More$23.45
- Hydrochloric Acid, 0.1 Normal in Isopropanol, 1 L, PolySKU: H1040-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsHydrochloric Acid, 0.1 Normal in Isopropanol, 1 L, Poly (1 per EA)Learn More$50.35
- Sulfuric Acid, 10% v/v Solution, 1 LSKU: S1064-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSulfuric Acid, 10% v/v Solution, 1 L (1 per EA)Learn More$20.85
- Methyl Alcohol, HPLC, with 0.1% v/v Formic Acid, 4 L, Amber GlassSKU: CF1204-4L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsHPLC Mobile Phase [Custom for Origins, Inc.] (1 per EA)Learn More$50.55
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Ceric Sulfate, 0.1 Normal, 3.8 L, Poly GallonSKU: C1019-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/10 (0.1 M); in 2 N Sulfuric Acid (1 per EA)Learn More$154.20 - Sodium Hydroxide, 6 Normal, 3.8 L, Poly GallonSKU: S1085-3.8L-EAManufacturer: 710 Spirits Rocky Mtn Reagents6 M (1 per EA)Learn More$62.85
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TE Buffer 20X Solution pH 8.0, 250 MillilitersSKU: T32200-250.0-EAManufacturer: Research Products InternationalDimensions: 3.38 x 4.63 x 3.38 Weight: 0.17 - Research or further manufacturing use only, not for food or drug use. (1 per EA)Learn More$46.00 -
Locke-Ringer's Solution - 500mLSKU: TS14148-500ml-EAManufacturer: Dawn ScientificLocke-Ringer's Solution - 500mL (1 per EA )Learn Morewas $164.62 Special Price $160.51 - Sodium Hydroxide TS - 100mLSKU: TS14256-100ml-EAManufacturer: Dawn ScientificSodium Hydroxide TS - 100mL (1 per EA )Learn Morewas $29.62 Special Price $28.88
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Sulfuric Acid, 0.255N (0.1275M), 4L, Poly BottleSKU: LC257304-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2796 (1 per EA)Learn Morewas $80.30 Special Price $61.78 - Zinc Sulfate, 0.02 M, 4.00 L Poly naturalSKU: CZ000500-4A-EAManufacturer: Reagents IncZinc Sulfate, 0.02 M, 4.00 L Poly natural (1 per EA )Learn Morewas $244.00 Special Price $187.71
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Vario Mr Cod Reagent, Mercury-Free 0-1500 Mg/L; 25 Vials, Ea/1SKU: 2420711-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 2565125. Lovibond COD MR Vario Vials 0-1500 mg/l, Mercury Free, 16mm diameter (pack of 25) (1 per EA)Learn More$60.30 - Zero Oxygen Solution, 120.00 mL Poly naturalSKU: CZ129700-120A-EAManufacturer: Reagents IncZero Oxygen Solution, 120.00 mL Poly natural (1 per EA )Learn Morewas $52.50 Special Price $40.39
- Ferroxyl Test Solution Kit with Nitric acid (Modified), 1 Liter Ready to Use - 1LSKU: TS14501-1L-EAManufacturer: Dawn ScientificFerroxyl Test Solution Kit with Nitric acid (Modified), 1 Liter Ready to Use - 1L (1 per EA )Learn Morewas $79.62 Special Price $77.63
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Dodecyltrimethylammonium Chloride, 50 Percent Solution in Alcohol, High Purity, 100mL, CAS# 112-00-5SKU: D1072-100ML-EAManufacturer: Spectrum ChemicalDodecyltrimethylammonium Chloride, 50 Percent Solution in Alcohol, High Purity is a quaternary ammonium compound (QAC) commonly used as a cationic surfactant. The High Purity grade denotes that this chemical is the highest quality commercially available. Spectrum Chemical manufactured High Purity grade products meet the toughest regulatory standards for quality and purity. (1 per EA)Learn More$118.55
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