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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Calcium Chloride, 50% w/w Solution, 1 L, PolySKU: C1124-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsCalcium Chloride, 50% w/w Solution, 1 L, Poly (1 per EA )Learn More$168.90 -
Citric Acid 10% W/V, 1L, Poly BottleSKU: LC131502-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $75.60 Special Price $56.70 -
Alkaline Iodide, 4L, Amber PolySKU: LC106404-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: UN1824 (1 per EA)Learn Morewas $328.30 Special Price $246.23 -
Bromocresol Purple 0.04% (Aq), 500ML, Poly BottleSKU: LC118901-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $36.10 Special Price $27.08 -
Methylene Blue, 1 Percent (w/v) Aqueous Solution, 500mL, CAS# 61-73-4SKU: M-204-1LT-EAManufacturer: Spectrum ChemicalMethylene Blue, 1 Percent (w/v) Aqueous Solution (1 per EA )Learn Morewas $68.80 Special Price $56.67 -
Ammonium Sulfide, Light Solution, Reagent, 100mL, CAS# 12135-76-1SKU: A1250-100ML-EAManufacturer: Spectrum ChemicalAmmonium Sulfide, Light Solution, Reagent, is an unstable salt with the formula (NH4)2S. It has a very strong odor, and the Reagent grade means it is used in the laboratory as an analytical testing agent. Common uses of AMMONIUM SULFIDE, LIGHT SOLUTION, REAGENT are industrial applications including photo developing, textile manufacturing and others. (1 per EA )Learn Morewas $120.15 Special Price $97.76 - Formaldehyde, 10% v/v Solution, 3.8 LSKU: F1010-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsFormaldehyde, 10% v/v Solution, 3.8 L (1 per EA)Learn More$44.30
- Sodium Hydroxide, 5 Normal, 1 L, PolySKU: S1030-1L-EAManufacturer: 710 Spirits Rocky Mtn Reagents5 M (1 per EA)Learn More$28.05
- Sulfuric Acid, 1 Normal, 1 L, PolySKU: S1061-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/1 (0.5 M) (1 per EA)Learn More$21.05
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Mercuric Nitrate, 0.0141N (0.0071M), 1L, Amber GlassSKU: LC166502-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $64.80 Special Price $48.60 - Ferric Ammonium Sulfate 8%, 1L, Poly BottleSKU: LC142702-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $135.40 Special Price $101.55
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Bleach Reagent #3, 16 ozSKU: R-0666-E-EAManufacturer: Taylor TechnologiesBleach Reagent #3, 16 oz (1 per EA)Learn Morewas $53.07 Special Price $40.54 -
Potassium Iodate-Iodide, 0.1N (0.0167M), 1L, Amber PolySKU: LC196802-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $99.60 Special Price $74.70 -
Sulfuric Acid, 0.100N, APHA, Solution, 500mL, CAS# 7664-93-9SKU: S-615-500ML-EAManufacturer: Spectrum ChemicalSulfuric Acid, 0.100N, APHA, Solution - As an APHA certified solution, this item is meets the ASTM D1209 standards and can be used 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 $38.75 Special Price $31.53 -
Ammonium Chloride-Ammonium Hydroxide, Buffer Solution, pH 10.0 +/- 0.1, For Water Hardness, APHASKU: B-205-500MLGL-EAManufacturer: Spectrum ChemicalAmmonium Chloride-Ammonium Hydroxide, Buffer Solution, pH 10.0 +/- 0.1, For Water Hardness, APHA is an aqueous inorganic buffer solution concentrate that, when diluted, is used for the American Public Health Association's (APHA) method for determination of water hardness. Find the high quality buffer solution Ammonium Chloride-Ammonium Hydroxide at Spectrum. As an aqueous inorganic buffer solution concentrate, it is used for the American Public Health Association's (APHA) method for determination of water hardness after dilution. (1 per EA )Learn Morewas $79.85 Special Price $64.97 - Acetic Acid, 3% v/v Solution, 3.8 LSKU: A1005-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsAcetic Acid, 3% v/v Solution, 3.8 L (1 per EA)Learn More$33.80
- Acetic Acid, 10% v/v Solution, 100 mLSKU: A1006-100mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsAcetic Acid, 10% v/v Solution, 100 mL (1 per EA)Learn More$17.80
- Xylenol Orange, 0.1% w/v Solution, 500 mLSKU: X1001-500mL-EAManufacturer: 710 Spirits Rocky Mtn ReagentsXylenol Orange, 0.1% w/v Solution, 500 mL (1 per EA)Learn More$47.90
- Potassium Fluoride, 50% w/w Solution, 1 L, PolySKU: P1030-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsPotassium Monofluoride, Dihydrate (1 per EA)Learn More$114.80
- Sodium Chromate, 5% w/v Solution, 3.8 L, Poly GallonSKU: S1021-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsChromic Acid, Disodium Salt, Tetrahydrate (1 per EA)Learn More$157.20
- Iodine, 0.0167N (0.0084M), 1L, Amber GlassSKU: LC156052-EAManufacturer: LabChemShelf Life (months): 18, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $68.50 Special Price $51.38
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Total Ionic Strength Adjustment Buffer, Solution, For Fluoride, APHAkgSKU: T-210-500MLPL-EAManufacturer: Spectrum ChemicalTotal Ionic Strength Adjustment Buffer, Solution, For Fluoride, APHA - As an APHA certified solution, this item is meets the ASTM D1209 standards and can be used 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 $89.55 Special Price $86.12 -
Sodium Hydroxide, 40 Percent (w/v) Solution, 20L, CAS# 79902-63-9SKU: S-427-20LT-EAManufacturer: Spectrum ChemicalSodium Hydroxide, 40 Percent (w/v) Solution - 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 $784.90 Special Price $638.67 -
Formic Acid, 88%, ACS, CAS# 64-18-6SKU: F1018-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsAssay: 88.0% Minimum; Concentration: ?26 N (1 per EA)Learn More$39.80
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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
LPS 200uL Universal Pipet Tips, Yellow, Bulk, PK1000
was $20.00 Special Price $15.75
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