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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BromopHenolblue pH Indicator Solution 100 ML, Ea/1SKU: 451621-EAManufacturer: Lovibond Tintometer GroupLovibond® Bromophenol Blue pH Indicator, Solution 100 ml (1 per EA)Learn More$45.20 -
Mercuric-Potassium Iodide TS (Mayer's Reagent) - 100mLSKU: TS14161-100ml-EAManufacturer: Dawn ScientificMercuric-Potassium Iodide TS (Mayer's Reagent) - 100mL (1 per EA )Learn Morewas $39.62 Special Price $38.63 -
Hydrochloric Acid, 33% v/v, 1.00 L Poly naturalSKU: C7101160-1A-EAManufacturer: Reagents IncHydrochloric Acid, 33% v/v, 1.00 L Poly natural (1 per EA )Learn Morewas $77.50 Special Price $58.32 -
Pd 250 Reagent Refill, Free Chlorine 1 X 250 Tests, Ea/1SKU: 530141-EAManufacturer: Lovibond Tintometer GroupLovibond PD 250 Reagent Refill, VARIO Free Chlorine, 1 X 250 Tests The fast and easy use of VARIO Powder Packs has made them extremely popular for water testing applications in many countries throughout the world. The Lovibond Powder Pack programmed prov (1 per EA)Learn More$63.70 -
Vario Lr Molybdate Reagent Set, F20 100 Tests, Ea/1SKU: 535450-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 2449400. Lovibond VARIO LR Molybdate Reagent Set, F20, 100 Tests The fast and easy use of VARIO Powder Packs has made them extremely popular for water testing applications in many countries throughout the world. The Lovib (1 per EA)Learn More$88.50 -
Phenolphthalein Indicator 2 oz DBSKU: R-0638-C-EAManufacturer: Taylor TechnologiesPhenolphthalein Indicator 2 oz DB (1 per EA)Learn Morewas $12.93 Special Price $9.88 - Phosphoric Acid, 0.085% /ACN, 4.00 L Glass amberSKU: CP223000-4C-EAManufacturer: Reagents IncPhosphoric Acid, 0.085% /ACN, 4.00 L Glass amber (1 per EA )Learn Morewas $259.00 Special Price $199.26
- Buffer, pH 10.00, Blue, 20.00 mL Single ShotSKU: C2156500-20S-EAManufacturer: Reagents IncBuffer, pH 10.00, Blue, 20.00 mL Single Shot (1 per EA )Learn Morewas $9.50 Special Price $7.56
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Pd 250 Reagent Refill, Free & Total Chlorine 250 Tests Each, Ea/1SKU: 530160-EAManufacturer: Lovibond Tintometer GroupLovibond PD 250 Reagent Refill, VARIO Free & Total Chlorine, 250 Tests Each The fast and easy use of VARIO Powder Packs has made them extremely popular for water testing applications in many countries throughout the world. The Lovibond Powder Pack progra (1 per EA)Learn More$118.40 -
Boric Acid 4% W/V With Indicator (Bcg), 1L, Poly BottleSKU: LC117502-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $60.90 Special Price $45.67 -
Hydrogen Peroxide, 3 Percent, Technical, 4L, CAS# 7722-84-1SKU: H4052-4LT-EAManufacturer: Spectrum ChemicalHydrogen Peroxide, 3 Percent, Technical – Technical grade products supplied by Spectrum are indicative of a grade suitable for general industrial use. These materials may or may not have a Certificate of Analysis available. (1 per EA )Learn Morewas $182.35 Special Price $175.36 - Picric Acid / EDTA Reagent, 4.00 L Black polySKU: CP006500-4BP-EAManufacturer: Reagents IncPicric Acid / EDTA Reagent, 4.00 L Black poly (1 per EA )Learn Morewas $267.00 Special Price $205.41
- Water Hardness Indicator, Mod, 500.00 mL Glass amberSKU: CW200600-500C-EAManufacturer: Reagents IncWater Hardness Indicator, Mod, 500.00 mL Glass amber (1 per EA )Learn Morewas $89.00 Special Price $68.47
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Buffer Solution Concentrate, pH 10.00, 500mLSKU: B1167-500ML-CSManufacturer: Spectrum ChemicalBuffer Solution Concentrate, pH 10.00 - Spectrum's Buffer Solution Concentrates when diluted as directed will yield a pH 10.00 SOLUTION. Spectrum Buffer Solution Concentrates are relied upon for cost effective, fast, accurate results in life sciences and pharmaceutical quality control applications. (6 per CS )Learn Morewas $1,208.80 Special Price $983.60 -
Buffer Solution pH 4.0, 10L, Cubitainer®SKU: LC122706-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $149.80 Special Price $112.35 -
Ceric Sulfate, 0.1N, Solution, 1L, CAS# 13590-82-4SKU: C-162-1LT-EAManufacturer: Spectrum ChemicalCeric Sulfate, 0.1N, Solution, is an aqueous solution is used as a potent oxidizer. It is used for redox titrations in analytical chemistry. (1 per EA )Learn Morewas $230.30 Special Price $187.39 - Thymolphthalein, 0.05%/90% SDA, 120.00 mL Poly naturalSKU: CT120000-120A-EAManufacturer: Reagents IncThymolphthalein, 0.05%/90% SDA, 120.00 mL Poly natural (1 per EA )Learn Morewas $39.50 Special Price $30.38
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EDTA, 0.1000 ± 0.0003 Molar, 1L, PolySKU: CF1322-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsEDTA, 0.1000 ± 0.0003 Molar, 1L, Poly (1 per EA )Learn More$57.78 - Alcoholic Potassium Hyroxide TS - 500mLSKU: TS14015-500ml-EAManufacturer: Dawn ScientificAlcoholic Potassium Hyroxide TS - 500mL (1 per EA )Learn Morewas $84.62 Special Price $82.50
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Potassium Permanganate, 0.05N (0.01M), 4L, Amber GlassSKU: LC199604-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $99.70 Special Price $74.78 - Sodium Silicate, 42° Baume, 4.00 L Poly naturalSKU: C2325000-4A-EAManufacturer: Reagents IncSodium Silicate, 42° Baume, 4.00 L Poly natural (1 per EA )Learn Morewas $78.00 Special Price $58.32
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Formaldehyde, 37 Percent, USP, 125mL, CAS# 50-00-0SKU: FO110-125ML-EAManufacturer: Spectrum ChemicalFormaldehyde, 37 Percent, USP. All Spectrum Chemical USP grade products are manufactured, packaged and stored under current Good Manufacturing Practices (cGMP). (1 per EA )Learn Morewas $71.55 Special Price $52.92 - Beraha's Sulfamic Acid Rgt #4, 500.00 mL Poly naturalSKU: CB004600-500A-EAManufacturer: Reagents IncBeraha's Sulfamic Acid Rgt #4, 500.00 mL Poly natural (1 per EA )Learn Morewas $70.50 Special Price $52.92
- Sulfamic Acid, 15% w/w, 4.00 L Poly naturalSKU: C7114300-4A-EAManufacturer: Reagents IncSulfamic Acid, 15% w/w, 4.00 L Poly natural (1 per EA )Learn Morewas $72.00 Special Price $54.00
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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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