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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Starch Indicator, 1% w/v Solution, 3.8 LSKU: S1047-3.8L-EAManufacturer: 710 Spirits Rocky Mtn ReagentsPotato Starch; Stabilized with Salicylic Acid (1 per EA)Learn More$39.95 -
Acetic Acid 56% W/W, 4L, Poly BottleSKU: LC103104-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2790 (1 per EA)Learn Morewas $222.30 Special Price $166.73 -
Potassium Iodide-Iodine Reagent, 1L, Amber GlassSKU: LC198162-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $99.40 Special Price $74.55 -
Sodium Hydroxide, 50 Percent (w/w) Solution, Technical, 4L, CAS# 1310-73-2SKU: S-622-4LTPL-EAManufacturer: Spectrum ChemicalSodium Hydroxide, 50 Percent (w/w) Solution, Technical is commonly known as Caustic soda. 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 $216.45 Special Price $176.13 -
Alkaline Iodide, 500ML, Amber PolySKU: LC106401-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: UN1824 (1 per EA)Learn Morewas $88.90 Special Price $66.68 -
Sodium Hydroxide, 0.4N (0.4M), 1L, Poly BottleSKU: LC243202-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)Learn Morewas $39.80 Special Price $30.62 -
Edta Reagent 5% W/V, 500ML, Poly BottleSKU: LC139301-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $66.20 Special Price $49.65 -
Vario Total Chlorine Indicator Solution 473 ML, Ea/1SKU: 540222-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 2263411. Lovibond Vario Total Chlorine Indicator Solution, 473 ml (1 per EA)Learn More$26.90 -
Alcoholic Phenol TS - 100mLSKU: TS14011-100ml-EAManufacturer: Dawn ScientificAlcoholic Phenol TS - 100mL (1 per EA )Learn Morewas $39.62 Special Price $38.63 -
Sodium Citrate, 40% w/v, 4.00 L Poly naturalSKU: C73145TX-4A-EAManufacturer: Reagents IncSodium Citrate, 40% w/v, 4.00 L Poly natural (1 per EA )Learn Morewas $130.00 Special Price $97.20 -
Vario Total & Acid Hydrolysable pHospHorous Reagent Set 50 Tests, Ea/1SKU: 535250-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 2742745. Lovibond VARIO Phosphorous, Total & Acid Hydrolyzable Reagent Set, 50 Tests Includes: VARIO Acid Reagent Vial - 50 ct. 531551, VARIO Phosphate 3 Reagent, F10 - 50 ct. Deionized Water (for Zero) - 100 ml 531520, V (1 per EA)Learn More$106.50 -
Sodium Hypochlorite, 5 Percent Available Chlorine, Solution, Reagent, ACS, 4L, CAS# 7681-52-9SKU: S1669-4LT-EAManufacturer: Spectrum ChemicalSodium Hypochlorite, 5 Percent Available Chlorine, Solution, Reagent, ACS is a chemical compound otherwise known as bleach. Sodium hypochlorite solutions are used for their disinfection, deodorizing and stain removal properties. As an ACS grade Reagent, Spectrum Chemical manufactured Sodium Hypochlorite is used as the quality standard against which other substances are graded and has met the toughest regulatory standards for quality and purity. (1 per EA )Learn Morewas $605.90 Special Price $358.56 -
Sulfuric Acid, 6.0N (3.0M), 2.5L, Clear GlassSKU: LC258503-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2796 (1 per EA)Learn Morewas $110.30 Special Price $84.86 -
RIPA Buffer 2X Solution, 250 MillilitersSKU: R26200-250.0-EAManufacturer: Research Products InternationalDimensions: 3.38 x 4.63 x 3.38 Weight: 0.17 - Research or further manufacturing use only, not for food or drug use. (1 per EA)Learn More$169.40 -
Sodium Hypochlorite, 5 Percent Available Chlorine, Solution, Reagent, ACS, 500mL, CAS# 7681-52-9SKU: S1669-500ML-CSManufacturer: Spectrum ChemicalSodium Hypochlorite, 5 Percent Available Chlorine, Solution, Reagent, ACS is a chemical compound otherwise known as bleach. Sodium hypochlorite solutions are used for their disinfection, deodorizing and stain removal properties. As an ACS grade Reagent, Spectrum Chemical manufactured Sodium Hypochlorite is used as the quality standard against which other substances are graded and has met the toughest regulatory standards for quality and purity. (6 per CS )Learn Morewas $776.55 Special Price $459.55 - TISAB III, with CDTA, 1.00 L Poly naturalSKU: CT131500-1A-EAManufacturer: Reagents IncTISAB III, with CDTA, 1.00 L Poly natural (1 per EA )Learn Morewas $192.00 Special Price $147.71
- Acetic Acid 2% V/V (1+49), 500ML, Poly BottleSKU: LC101501-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $47.00 Special Price $35.25
- Sodium Nitrate, 10% w/v, 1.00 L Poly naturalSKU: CS183400-1A-EAManufacturer: Reagents IncSodium Nitrate, 10% w/v, 1.00 L Poly natural (1 per EA )Learn Morewas $149.00 Special Price $111.24
- Sodium Hydroxide, 1.6 M (1.6N), 4.00 L Poly naturalSKU: CS131000-4A-EAManufacturer: Reagents IncSodium Hydroxide, 1.6 M (1.6N), 4.00 L Poly natural (1 per EA )Learn Morewas $97.00 Special Price $72.36
- Acetic Acid/Water Std 90/10, 20.00 L CubitainerSKU: CA012200-20F-EAManufacturer: Reagents IncAcetic Acid/Water Std 90/10, 20.00 L Cubitainer (1 per EA )Learn Morewas $665.00 Special Price $511.60
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Titration Solvent, 4L, Amber GlassSKU: LC261404-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: UN1993 (1 per EA)Learn Morewas $196.70 Special Price $151.33 - Sulfuric Acid 5% V/V (1+19), 500ML, Poly BottleSKU: LC255701-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2796 (1 per EA)Learn Morewas $31.00 Special Price $23.85
- Sodium Thiocyanate, 0.1N (0.1M), 4L, Poly BottleSKU: LC249704-EAManufacturer: LabChemShelf Life (months): 4, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $188.10 Special Price $144.71
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Vario pHospHonate Reagent Set, F10 100 Tests, Ea/1SKU: 535220-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 2429700. Lovibond VARIO Phosphonate Reagent Set, 100 Tests Includes: 531560, VARIO Potassium Persulfate, F10 - 100 ct. 531550, VARIO Phosphate 3 Reagent, F10 - 2 x 100 ct. (1 per EA)Learn More$132.80
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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
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
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