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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Sodium Hydroxide, 0.100 N Solution, APHA, 4L, CAS# 1310-73-2SKU: S-340-4LTPL-CSManufacturer: Spectrum ChemicalSodium Hydroxide, 0.100 N Solution, APHA is a standard solution of Caustic soda ideally suited for laboratory titrimetric techniques. You can rely on the quality of LabChem analytical test solutions for lot-to-lot reproducibility. (4 per CS )Learn Morewas $425.75 Special Price $346.43 -
Vario Dpd Total, F5 100 Pack, Ea/1SKU: 530080-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 1407699. (1 per EA )Learn More$24.02 -
Biuret Reagent, 1L, Poly BottleSKU: LC116902-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: (1 per EA)Learn Morewas $75.90 Special Price $56.93 -
Acetonitrile, 30% v/v HPLC, 4.00 L Glass amberSKU: CA107200-4C-EAManufacturer: Reagents IncAcetonitrile, 30% v/v HPLC, 4.00 L Glass amber (1 per EA )Learn Morewas $246.00 Special Price $184.68 -
Hardness Reagent A (odorless buffer), 16 ozSKU: R-0614-E-EAManufacturer: Taylor TechnologiesHardness Reagent A (odorless buffer), 16 oz (1 per EA)Learn Morewas $245.19 Special Price $187.29 - Sodium Thiosulfate, 0.0375N (0.0375M), 1L, Poly BottleSKU: LC250302-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $38.80 Special Price $29.85
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Vanadomolybdate Solution, 4L, Poly BottleSKU: LC266204-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: UN3264 (1 per EA)Learn Morewas $401.00 Special Price $308.50 - Synthetic Perspiration Reagent, 1.00 L Poly naturalSKU: CS500100-1A-EAManufacturer: Reagents IncSynthetic Perspiration Reagent, 1.00 L Poly natural (1 per EA )Learn Morewas $291.00 Special Price $218.16
- Buffer Solution pH 8.0, 1L, Poly BottleSKU: LC124202-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $60.40 Special Price $45.30
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Silver Nitrate, 0.171N (0.171M), 1L, Amber GlassSKU: LC227202-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $419.90 Special Price $314.93 - Starch Indicator 1%, 4L, Poly BottleSKU: LC253104-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: (1 per EA)Learn Morewas $82.90 Special Price $63.78
- Sodium Thiosulfate, 0.01N (0.01M), 4L, Poly BottleSKU: LC250004-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $119.70 Special Price $92.09
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Sodium Thiosulfate, 0.025N (0.025M), 20L, Cubitainer®SKU: LC250205-EAManufacturer: LabChemShelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $230.60 Special Price $177.41 - Lactic Acid, 1% v/v, 10.00 L CubitainerSKU: CL101300-10F-EAManufacturer: Reagents IncLactic Acid, 1% v/v, 10.00 L Cubitainer (1 per EA )Learn Morewas $153.00 Special Price $114.48
- Phosphate Buffer, pH 7, D1253, 4.00 L Poly naturalSKU: CP004600-4A-EAManufacturer: Reagents IncPhosphate Buffer, pH 7, D1253, 4.00 L Poly natural (1 per EA )Learn Morewas $370.00 Special Price $277.56
- Sodium Hydroxide, 0.35 N, 1.00 L Poly naturalSKU: CS008500-1A-EAManufacturer: Reagents IncSodium Hydroxide, 0.35 N, 1.00 L Poly natural (1 per EA )Learn Morewas $49.00 Special Price $36.72
- Sodium Carbonate, 2 N, 1.00 L Poly naturalSKU: CS122200-1A-EAManufacturer: Reagents IncSodium Carbonate, 2 N, 1.00 L Poly natural (1 per EA )Learn Morewas $91.00 Special Price $68.04
- Hydrochloric Acid, 0.5 N, 200.00 L DrumSKU: C7101060-200E-EAManufacturer: Reagents IncHydrochloric Acid, 0.5 N, 200.00 L Drum (1 per EA )Learn Morewas $942.00 Special Price $706.32
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Potassium Dichromate, 0.25N (0.0417M), 500ML, Poly BottleSKU: LC190101-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $48.40 Special Price $36.30 -
Potassium Chlorate, 8% w/v Solution, 3.8 L, Poly GallonSKU: P1004-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsSaturated Solution (1 per EA)Learn More$209.40 -
Sodium Hydroxide, 1.54N 100 ML, Ea/1SKU: 531530-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 2743042. Lovibond VARIO Sodium Hydroxide, 1.54 N, 100 ml (1 per EA)Learn More$20.50 - Sodium Hydroxide-Sodium Thiosulfate, 20L, Cubitainer®SKU: LC246005-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $291.90 Special Price $224.56
- Water Hardness Buffer (With Magnesium), 1L, Poly BottleSKU: LC268102-EAManufacturer: LabChemShelf Life (months): 6, , UN Number: UN2672 (1 per EA)Learn Morewas $68.30 Special Price $52.54
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Sodium Hydroxide, 10.0 N Aqueous Solution, APHA, 1L, CAS# 1310-73-2SKU: S-395-1LT-CSManufacturer: Spectrum ChemicalSodium Hydroxide, 10.0 N Aqueous Solution, APHA - As an APHA certified solution, this item meets the ASTM D1209 standards for use 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. (6 per CS )Learn Morewas $480.75 Special Price $391.19
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