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, 50% v/v, 10.00 L CubitainerSKU: C7306200-10F-EAManufacturer: Reagents IncSulfuric Acid, 50% v/v, 10.00 L Cubitainer (1 per EA )Learn Morewas $191.00 Special Price $143.64 -
Methyl Red TS - 500mLSKU: TS14169-500ml-EAManufacturer: Dawn ScientificMethyl Red TS - 500mL (1 per EA )Learn Morewas $65.62 Special Price $63.98 - Methyl Purple TS - 100mLSKU: TS14168-100ml-EAManufacturer: Dawn ScientificMethyl Purple TS - 100mL (1 per EA )Learn Morewas $59.62 Special Price $58.13
- Methylene Blue TS - 100mLSKU: TS14177-100ml-EAManufacturer: Dawn ScientificMethylene Blue TS - 100mL (1 per EA )Learn Morewas $39.62 Special Price $38.63
- Methyl Yellow-Methylene Blue TS - 500mLSKU: TS14175-500ml-EAManufacturer: Dawn ScientificMethyl Yellow-Methylene Blue TS - 500mL (1 per EA )Learn Morewas $154.62 Special Price $150.76
- Indicator A, 4.00 L Poly naturalSKU: C84030NE-4A-EAManufacturer: Reagents IncIndicator A, 4.00 L Poly natural (1 per EA )Learn Morewas $285.00 Special Price $213.84
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Formaldehyde, 10 Percent (v/v) Solution, Stabilized with approx. 3 Percent Methanol, Histological Grade-00-0SKU: HS008-20LT-EAManufacturer: Spectrum ChemicalFormaldehyde, 10 Percent (v/v) Solution, Stabilized with approx. 3 Percent Methanol, Histological Grade is used as an embalming and tissue fixative. as well as a nail hardener and in nail polish. It is not intended for and should not be (i) used for medical, surgical or other patient oriented applications, or (ii) combined with any food product or ingested in any form. (1 per EA )Learn Morewas $1,071.30 Special Price $950.96 - Sodium Carboxymethylcellulose, (Viscosity of 2 Percent Aqueous Solution @ 25 DEG C: 34.0-50.0 cP), USP, 12kg, CAS# 9004-32-4SKU: C4622-12KG-EAManufacturer: Spectrum ChemicalSodium Carboxymethylcellulose, (Viscosity of 2 Percent Aqueous Solution @ 25 DEG C: 34.0-50.0 cP), USP, 12kg, CAS# 9004-32-4 (1 per EA )Learn Morewas $2,640.60 Special Price $2,343.99
- Mercuric Nitrate TS - 1LSKU: TS14160-1L-EAManufacturer: Dawn ScientificMercuric Nitrate TS - 1L (1 per EA )Learn Morewas $244.62 Special Price $238.51
- Phenylhydrazine Acetate TS - 1LSKU: TS14202-1L-EAManufacturer: Dawn ScientificPhenylhydrazine Acetate TS - 1L (1 per EA )Learn Morewas $254.62 Special Price $248.26
- Phosphate Buffer,0.05 M,pH 7.4, 20.00 L CubitainerSKU: CP209500-20F-EAManufacturer: Reagents IncPhosphate Buffer,0.05 M,pH 7.4, 20.00 L Cubitainer (1 per EA )Learn Morewas $315.00 Special Price $242.33
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Sodium Hydroxide, 50 Percent (w/w), Solution, Reagent, 1L, CAS# 1310-73-2SKU: S1310-1LTPL-CSManufacturer: 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. (6 per CS )Learn Morewas $791.40 Special Price $702.51 - Weck's Reagent for alpha Ti, 500.00 mL Poly naturalSKU: CW000400-500A-EAManufacturer: Reagents IncWeck's Reagent for alpha Ti, 500.00 mL Poly natural (1 per EA )Learn Morewas $145.00 Special Price $111.56
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Total pHospHate , Pmb, Tube Test 0,20-10/0,07-3,0 Mg/L, Ea/1SKU: 2419019-EAManufacturer: Lovibond Tintometer GroupLovibond® Phosphate, Total LR Tube Test, 24 Tests Includes: Reaction Tube, LR Phosphate-101 Calibration Tube - 2 ct. Phosphate-102 Solution Phosphate-103 Reagent (1 per EA)Learn More$172.80 - Universal Indicator, 500.00 mL Poly naturalSKU: C6126000-500A-EAManufacturer: Reagents IncUniversal Indicator, 500.00 mL Poly natural (1 per EA )Learn Morewas $101.00 Special Price $75.60
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Ethyl Glyoxylate, (47 Percent in Toluene), 25g, CAS# 924-44-7SKU: E1489-25GM-EAManufacturer: Spectrum ChemicalEthyl Glyoxylate, (47 Percent in Toluene) (1 per EA )Learn More$90.60 - Chromic Acid, 30% w/w, 1.00 L Poly naturalSKU: CC241000-1A-EAManufacturer: Reagents IncChromic Acid, 30% w/w, 1.00 L Poly natural (1 per EA )Learn Morewas $267.00 Special Price $199.80
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Vario Alkaline-Cyanide Reagent Solution 500 ML, Ea/1SKU: 530622-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 2122349. Lovibond Vario Alkaline-Cyanide Reagent Solution, 500 ml (1 per EA)Learn More$101.00 -
Polyethyleneimine, 50 Percent (v/v) Aqueous Solution, 1L, CAS# 9002-98-6SKU: P1647-1LTBL-EAManufacturer: Spectrum ChemicalPolyethyleneimine, 50 Percent (v/v) Aqueous Solution, or PEI, is soluble in hot water as well as in methanol, ethanol, chloroform and at low pH. It ability to modify the surface of cellulose fibres make it usable in many products such as adhesives, cosmetics, water treatment agents and detergents. (1 per EA )Learn More$1,398.00 -
Magnesium Edta 0.02% W/V, 500ML, Poly BottleSKU: LC164501-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $59.60 Special Price $44.70 -
Vario Manganese Hr Reagent Set, F10 100 Tests, Ea/1SKU: 535100-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 2430000. Lovibond VARIO HR Manganese Reagent Set, F10, 100 Tests Includes: 530650, VARIO Manganese Citrate Buffer Reagent, F10 - 100 ct. 530660, VARIO Sodium Periodate Reagent, F10 - 100 ct. (1 per EA)Learn More$94.50 - Sodium Hydroxide, 25% w/v, 4.00 L Poly naturalSKU: C7550X00-4A-EAManufacturer: Reagents IncSodium Hydroxide, 25% w/v, 4.00 L Poly natural (1 per EA )Learn Morewas $98.00 Special Price $73.44
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Vario Total Chlorine Buffer Solution 473 ML, Ea/1SKU: 540223-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 2263511. Lovibond Vario Total Chlorine Buffer Solution, 473 ml (1 per EA)Learn More$26.90 -
Dissolved Oxygen - Vacu-Vials 0.1- 1.4 Mg/L, Ea/1SKU: 380450-EAManufacturer: Lovibond Tintometer GroupLovibond® Dissolved Oxygen Ampoule (Vacu-Vial®), 30 ct (1 per EA)Learn More$150.70
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4L Yellow Buffer Solution pH 7.0 @ 25°C, Poly Bottle
was $74.64 Special Price $21.46
BEAD BATH 20 L, 120 V, TYPE B PLUG, Liters/EA: 20
was $1,794.65 Special Price $1,714.78
LPS 200uL Universal Pipet Tips, Yellow, Bulk, PK1000
was $20.00 Special Price $15.75
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