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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Buffer Solution pH 2.0, 500ML, Poly BottleSKU: LC122201-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $36.10 Special Price $27.08 -
Traceable, pH 10.012, 100ml pH Buffer Standard, PK6SKU: 4289-PKManufacturer: Control CompanyTraceable, pH 10.012, 100ml pH Buffer Standard, PK6 (6 per PK )Learn Morewas $30.17 Special Price $23.55 - Sulfuric Acid, 1.0N (0.5M), 500ML, Poly BottleSKU: LC257701-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2796 (1 per EA)Learn Morewas $23.10 Special Price $17.77
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Vario Hardness Buffer 100 MLSKU: R-5004-2-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 42432. Lovibond Vario Hardness Buffer, 100 ml (1 per EA)Learn Morewas $35.00 Special Price $25.60 -
Hydrogen Peroxide 30% W/W, 4L, Poly BottleSKU: LC154304-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2014 (1 per EA)Learn Morewas $439.60 Special Price $329.70 - Edta, 0.05M (0.1N), 4L, Poly BottleSKU: LC138704-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $123.50 Special Price $92.62
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Vario Dpd Total, F25 100 PackSKU: 530130-PKManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 1406499. Lovibond VARIO DPD Total, F25, 100 Pack 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 (100 per PK )Learn More$31.60 - Acetate Buffer pH 4.0 For Chlorine, Iodine, 4L, Poly BottleSKU: LC100304-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $204.80 Special Price $153.60
- Sulfuric Acid, 3.0N (1.5M), 4L, Poly BottleSKU: LC258104-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2796 (1 per EA)Learn Morewas $113.00 Special Price $86.94
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Isopropyl Alcohol 70% V/V (Made From ACS Grade), 10L, Cubitainer®SKU: LC157606-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: UN1219 (1 per EA)Learn Morewas $352.30 Special Price $264.22 -
Vario Lr Cod Reagent 0-150 Mg/L; 25 Vials, Ea/1SKU: 2420720-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 2125825. Reagent COD Vario Vials 0-150 mg/l, 16mm ø Pack Size 25 (1 per EA)Learn More$54.70 -
Sodium Thiosulfate, 1.0N (1.0M), 20L, Cubitainer®SKU: LC251005-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $361.10 Special Price $277.80 -
Electrolyte for Salt Analyzer, 500.00 mL Poly naturalSKU: CE000900-500A-EAManufacturer: Reagents IncElectrolyte for Salt Analyzer, 500.00 mL Poly natural (1 per EA )Learn Morewas $52.00 Special Price $38.88 - Silver Nitrate, 0.005 N, 1.00 L Glass amberSKU: CS302500-1C-EAManufacturer: Reagents IncSilver Nitrate, 0.005 N, 1.00 L Glass amber (1 per EA )Learn Morewas $67.00 Special Price $50.76
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Nitric Acid, 1.0N (1.0M), 1L, Amber GlassSKU: LC178402-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2031 (1 per EA)Learn Morewas $53.60 Special Price $40.20 -
Buffer Solution A, 1L, Poly BottleSKU: LC125702-EAManufacturer: LabChemShelf Life (months): 36, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $175.60 Special Price $131.70 - Isopropyl Alcohol 50% V/V (Made From ACS Grade), 20L, Cubitainer®SKU: LC157555-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: UN1219 (1 per EA)Learn Morewas $400.00 Special Price $300.00
- Sulfuric Acid, 0.2N (0.1M), 1L, Poly BottleSKU: LC257002-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2796 (1 per EA)Learn Morewas $37.10 Special Price $27.82
- Quimociac Reagent, 1.00 L Glass amberSKU: CQ102000-1C-EAManufacturer: Reagents IncQuimociac Reagent, 1.00 L Glass amber (1 per EA )Learn Morewas $336.00 Special Price $251.64
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Hydrochloric Acid 50% V/V (1+1), 20L, Poly DrumSKU: LC151305-EAManufacturer: LabChemShelf Life (months): 36, Traceable to NIST, UN Number: UN1789 (1 per EA)Learn Morewas $492.40 Special Price $369.30 - Arsenic Trioxide, 100 ppm As, 1.00 L Glass amberSKU: CA205300-1C-EAManufacturer: Reagents IncArsenic Trioxide, 100 ppm As, 1.00 L Glass amber (1 per EA )Learn Morewas $292.00 Special Price $219.24
- Silver Nitrate, 0.0141N (0.0141M), 10L, Cubitainer®SKU: LC226006-EAManufacturer: LabChemShelf Life (months): 18, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $405.80 Special Price $304.35
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Vario Dpd Total, F10 1000 PackSKU: 530123-PKManufacturer: Lovibond Tintometer GroupLovibond VARIO DPD Total Chlorine Reagent, F10, 1000 Pack 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 provides more (1000 per PK )Learn More$240.60 -
Vario Dpd Free, F10 1000 PackSKU: 530103-PKManufacturer: Lovibond Tintometer GroupLovibond VARIO DPD Free Chlorine Reagent, F10, 1000 Pack 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 provides more (1000 per PK )Learn More$238.20
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