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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Ammonia TS, Stronger - 100mLSKU: TS14028-100ml-EAManufacturer: Dawn ScientificAmmonia TS, Stronger - 100mL (1 per EA )Learn Morewas $44.62 Special Price $43.50 -
Hydrogen Peroxide Solution, 30 Percent, Reagent, ACS, 500mL, CAS# 7722-84-1SKU: H1065-500MLPL-EAManufacturer: Spectrum ChemicalHydrogen Peroxide Solution, 30 Percent, Reagent, ACS, is the simplest peroxide, a strong oxidizer that appears as a clear and slightly viscous liquid. Its oxidizing properties are so strong that it is considered a highly reactive oxygen species. Due to it being a weak acid it can form hydroperoxide or peroxide salts. One of its biggest uses is in the treatment of drinking water, removing odors, organic materials and the amount of Hydrogen sulfides and Iron. As an ACS grade Reagent, Spectrum Chemical manufactured Hydrogen Peroxide is used as the quality standard against which other substances are graded and has met the toughest regulatory standards for quality and pureness. (1 per EA )Learn Morewas $244.40 Special Price $144.63 -
PAN Indicator, 0.1% / Alcohol, 500.00 mL Glass amberSKU: CP005000-500C-EAManufacturer: Reagents IncPAN Indicator, 0.1% / Alcohol, 500.00 mL Glass amber (1 per EA )Learn Morewas $88.00 Special Price $65.88 - Indigo Carmine, 1%, Aqueous, 500.00 mL Glass amberSKU: CI160000-500C-EAManufacturer: Reagents IncIndigo Carmine, 1%, Aqueous, 500.00 mL Glass amber (1 per EA )Learn Morewas $172.00 Special Price $128.52
- Sodium Periodate, 10.69 g/L, 500.00 mL Glass amberSKU: CS041900-500C-EAManufacturer: Reagents IncSodium Periodate, 10.69 g/L, 500.00 mL Glass amber (1 per EA )Learn Morewas $115.00 Special Price $86.40
- Acetic Acid, 0.02 N, 4.00 L Poly naturalSKU: CA008300-4A-EAManufacturer: Reagents IncAcetic Acid, 0.02 N, 4.00 L Poly natural (1 per EA )Learn Morewas $120.00 Special Price $89.64
- Pyridine-Barbituric Acid Rgt, 1.00 L Glass amberSKU: CP302600-1C-EAManufacturer: Reagents IncPyridine-Barbituric Acid Rgt, 1.00 L Glass amber (1 per EA )Learn Morewas $218.00 Special Price $163.08
- Sodium Citrate TS - 100mLSKU: TS14251-100ml-EAManufacturer: Dawn ScientificSodium Citrate TS - 100mL (1 per EA )Learn Morewas $44.62 Special Price $43.50
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TRIS BUFFERED SALINE, 10X SOLUTION, 1 LITER CAS# 77-86-1; 7647-14-5; 7447-40-7SKU: T60075-1000.0-EAManufacturer: Research Products InternationalMol. Wt: Common Name: TRIS Buffered Saline 10X Solution Formula: Dimensions: 5.25 x 7.50 x 2.25, Weight: 2.62, Cas#: 77-86-1; 7647-14-5; 7447-40-7 Research or further manufacturing use only, not for food or drug use. (1 per EA)Learn More$50.80 - Murexide-Sodium Chloride APHA, 250.00 g Glass amb wmSKU: CM200100-250C2-EAManufacturer: Reagents IncMurexide-Sodium Chloride APHA, 250.00 g Glass amb wm (1 per EA )Learn Morewas $135.00 Special Price $101.52
- Potassium Hydroxide TS 2, Alcoholic - 500mLSKU: TS14221-500ml-EAManufacturer: Dawn ScientificPotassium Hydroxide TS 2, Alcoholic - 500mL (1 per EA )Learn Morewas $109.62 Special Price $106.88
- Soap Solution for Biodiesel, 20.00 L CubitainerSKU: CS027000-20F-EAManufacturer: Reagents IncSoap Solution for Biodiesel, 20.00 L Cubitainer (1 per EA )Learn Morewas $688.00 Special Price $516.24
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Boric Acid 4% W/V With Indicator (Bcg), 4L, Poly BottleSKU: LC117504-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $108.20 Special Price $81.15 - Pot Hydroxide, 0.1 N in MeOH, 10.00 L CubitainerSKU: C7285050-10F-EAManufacturer: Reagents IncPot Hydroxide, 0.1 N in MeOH, 10.00 L Cubitainer (1 per EA )Learn Morewas $299.00 Special Price $224.64
- Sodium Oxalate, 0.1 M (0.2 N), 500.00 mL Poly naturalSKU: CS157500-500A-EAManufacturer: Reagents IncSodium Oxalate, 0.1 M (0.2 N), 500.00 mL Poly natural (1 per EA )Learn Morewas $70.00 Special Price $52.92
- Ferrous Sulfate TS - 100mLSKU: TS14113-100ml-EAManufacturer: Dawn ScientificFerrous Sulfate TS - 100mL (1 per EA )Learn Morewas $44.62 Special Price $43.50
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Vario Dpd Free, F10 100 Pack, Ea/1SKU: 530180-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 2105569. (1 per EA )Learn More$25.06 - Buffer, pH 1.68, 500.00 mL Poly naturalSKU: C2115168-500A-EAManufacturer: Reagents IncBuffer, pH 1.68, 500.00 mL Poly natural (1 per EA )Learn Morewas $29.00 Special Price $21.60
- Ammonium Hydroxide, 10% w/v, 20.00 L CubitainerSKU: C7103520-20F-EAManufacturer: Reagents IncAmmonium Hydroxide, 10% w/v, 20.00 L Cubitainer (1 per EA )Learn Morewas $392.00 Special Price $293.76
- Hydrochloric Acid, 6 N, 4.00 L Poly naturalSKU: C7101150-4A-EAManufacturer: Reagents IncHydrochloric Acid, 6 N, 4.00 L Poly natural (1 per EA )Learn Morewas $158.00 Special Price $118.80
- Ammonium Hydroxide, 2% v/v, 1.00 L Poly naturalSKU: CA011700-1A-EAManufacturer: Reagents IncAmmonium Hydroxide, 2% v/v, 1.00 L Poly natural (1 per EA )Learn Morewas $63.00 Special Price $47.52
- Mercuric Bromide TS, Alcoholic - 500mLSKU: TS14157-500ml-EAManufacturer: Dawn ScientificMercuric Bromide TS, Alcoholic - 500mL (1 per EA )Learn Morewas $189.62 Special Price $184.87
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TAE 50X Buffer, TRIS Acetate EDTA 50X Solution, 1 Liter CAS# 77-86-1; 64-19-7; 6381-92-6; 7732-18-5SKU: T60015-1000.0-EAManufacturer: Research Products InternationalMol. Wt: Common Name: TRIS Acetate EDTA 50X Solution Formula: Dimensions: 5.25 x 7.50 x 2.25, Weight: 2.62, Cas#: 77-86-1; 64-19-7; 6381-92-6; 7732-18-5 Research or further manufacturing use only, not for food or drug use. (1 per EA)Learn More$177.10 - Iodine, 0.01 N, 1.00 L Glass amberSKU: CI100900-1C-EAManufacturer: Reagents IncIodine, 0.01 N, 1.00 L Glass amber (1 per EA )Learn Morewas $56.00 Special Price $42.12
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LPS 200uL Universal Pipet Tips, Yellow, Bulk, PK1000
was $20.00 Special Price $15.75
BEAD BATH 20 L, 120 V, TYPE B PLUG, Liters/EA: 20
was $1,794.65 Special Price $1,714.78
4L Yellow Buffer Solution pH 7.0 @ 25°C, Poly Bottle
was $74.64 Special Price $21.46
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