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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Acetic Acid, 5% v/v Solution, 1 LSKU: A1040-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsAcetic Acid, 5% v/v Solution, 1 L (1 per EA)Learn More$19.80 -
Sulfuric Acid, 2.0 N Solution, 1L, CAS# 7664-93-9SKU: S-640-1LT-EAManufacturer: Spectrum ChemicalSulfuric Acid, 2.0 N Solution - Spectrum utilizes the highest quality raw materials appropriate to your product. Most raw materials meet or exceed the specifications established by the American Chemical Society. Where appropriate, many finished products are traceable to NIST Standard Reference Materials. Manufacturing, quality control testing, and packaging are all performed in Spectrum’s own facilities. Record keeping and sample retention of all produced lots ensure product consistency and complete traceability. (1 per EA )Learn Morewas $79.10 Special Price $64.36 -
Molybdate Reagent .75oz DBSKU: R-0601-A-EAManufacturer: Taylor TechnologiesMolybdate Reagent .75oz DB (1 per EA)Learn Morewas $11.10 Special Price $8.49 -
Copper Sulfate-Sulfamic Acid, 1L, Poly BottleSKU: LC134702-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: UN1760 (1 per EA)Learn Morewas $96.20 Special Price $72.15 - Sodium Chloride-Hydroxylamine Sulfate, 1L, Poly BottleSKU: LC236002-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $182.40 Special Price $140.32
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Sulfuric Acid, 1.00 N Solution, APHA, 4L, CAS# 7664-93-9SKU: S-630-4LTPL-EAManufacturer: Spectrum ChemicalSulfuric Acid, 1.00 N Solution, 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 $131.80 Special Price $107.24 - Potassium Thiocyanate, 0.1 Normal, 1 L, PolySKU: P1058-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsN/10 (0.1 M); Potassium Sulfocyanate; Potassium Thiocyanide (1 per EA)Learn More$20.70
- Nitric Acid, 50% v/v Solution, 1 LSKU: N1016-1L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsADD LW1100-056 (1L DOT ACID PACKER) (1 per EA)Learn More$39.40
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FAS-DPD Titrating Reagent (for chlorine), 2 oz, Dropper Bottle, 12-packSKU: R-0871-C-12-PKManufacturer: Taylor TechnologiesFAS-DPD Titrating Reagent (for chlorine), 2 oz, Dropper Bottle, 12-pack (12 per PK)Learn Morewas $237.21 Special Price $181.21 - Buffer Solution pH 12.0, 1L, Poly BottleSKU: LC125602-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $55.10 Special Price $41.32
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Thiosulfate Reagent (25 mL sample, 1 drop = 5 ppm H₂O₂), 16 ozSKU: R-0774-E-EAManufacturer: Taylor TechnologiesThiosulfate Reagent (25 mL sample, 1 drop = 5 ppm H₂O₂), 16 oz (1 per EA)Learn Morewas $47.36 Special Price $36.18 -
Sulfosalicylic Acid 3% W/V, 4L, Amber PolySKU: LC255304-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $161.80 Special Price $124.47 -
Sodium Hydroxide, 30 Percent (w/v) Solution, 500mL, CAS# 1310-73-2SKU: S-954-500ML-EAManufacturer: Spectrum ChemicalSodium Hydroxide, 30 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 $62.35 Special Price $50.73 - Copper Sulfate, 0.02M (0.02N), 1L, Poly BottleSKU: LC134432-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $45.80 Special Price $34.35
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TBE Buffer, TRIS-Borate-EDTA, 10X Powder, 170.3 Grams of Powder Makes 1 Liter of Solution CAS# 77-86-1; 10043-35-3;6381-92-6/60-00-4SKU: T22020-1.0-EAManufacturer: Research Products InternationalMol. Wt: Common Name: TRIS-Borate-EDTA Formula: Dimensions: 3.50 x 3.75 x 3.50, Weight: 0.47, Cas#: 77-86-1; 10043-35-3;6381-92-6/60-00-4 Research or further manufacturing use only, not for food or drug use. (1 per EA)Learn More$38.35 -
Hydrochloric Acid, 5.0N (5.0M), 4L, Amber GlassSKU: LC153604-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1789 (1 per EA)Learn Morewas $183.20 Special Price $137.40 - Boric Acid 2% W/V, 4L, Poly BottleSKU: LC117204-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $127.00 Special Price $95.25
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Iron Reagent #2, .75 ozSKU: R-0852-A-EAManufacturer: Taylor TechnologiesIron Reagent #2, .75 oz (1 per EA)Learn Morewas $9.72 Special Price $7.43 -
Sodium Thiocyanate, 0.1N (0.1M), 500ML, Poly BottleSKU: LC249701-EAManufacturer: LabChemShelf Life (months): 4, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $47.20 Special Price $36.31 - Oxalic Acid 5% W/V, 1L, Poly BottleSKU: LC180502-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $68.50 Special Price $51.38
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Murexide Indicator 0.15%, 500ML, Amber GlassSKU: LC175001-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: (1 per EA)Learn Morewas $117.70 Special Price $88.28 -
Hardness Reagent (25 mL sample, 1 drop = 2 ppm hardness as CaCO₃), 32 ozSKU: R-0806-F-EAManufacturer: Taylor TechnologiesHardness Reagent (25 mL sample, 1 drop = 2 ppm hardness as CaCO₃), 32 oz (1 per EA)Learn Morewas $41.84 Special Price $31.96 - Sodium Hydroxide, 2 Normal, 3.8 L, Poly GallonSKU: S1029-3.8L-EAManufacturer: 710 Spirits Rocky Mtn Reagents2 M (1 per EA)Learn More$45.40
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Iron Reagent #1, 2 ozSKU: R-0851-C-EAManufacturer: Taylor TechnologiesIron Reagent #1, 2 oz (1 per EA)Learn Morewas $18.59 Special Price $14.19
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LPS 200uL Universal Pipet Tips, Yellow, Bulk, PK1000
was $20.00 Special Price $15.75
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
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