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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Vario Reactive pHospHorus Reagent Set 50 Tests, Ea/1SKU: 535200-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 2742545. Lovibond VARIO Ortho Phosphate Reagent Set, 50 Tests Includes: VARIO Dilution Vial - 50 ct. 531551, VARIO Phosphate 3 Reagent, F10 - 50 ct. Deionized Water (for Zero) - 100 ml (1 per EA)Learn More$71.20 -
Lactic Acid 10% V/V, 500ML, Poly BottleSKU: LC160001-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $66.40 Special Price $49.80 -
Total Hardness Reagent, .75 oz, Dropper BottleSKU: R-0854-A-EAManufacturer: Taylor TechnologiesTotal Hardness Reagent, .75 oz, Dropper Bottle (1 per EA)Learn Morewas $10.08 Special Price $7.69 -
Chlorine Water, Saturated Solution, Approx. 0.4 Percent Chlorine, 500mL, CAS# 7782-50-5SKU: C-205-500ML-EAManufacturer: Spectrum ChemicalChlorine Water, Saturated Solution, Approx. 0.4 Percent Chlorine is a Spectrum solution concentrate that allows the preparation of fresh, reliable standard volumetric solutions quickly and accurately. Simply dilute the desired USP test solution concentrate to the specified volume (carefully following instructions provided with the package) and the resulting solution will have an exact Normality within 0.1%. Spectrum USP test solution concentrates are relied upon for fast, accurate results in life sciences and pharmaceutical quality control applications. (1 per EA )Learn Morewas $265.85 Special Price $216.32 - Potassium Bromide Solution, 500ML, Poly BottleSKU: LC187851-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: (1 per EA)Learn Morewas $84.90 Special Price $63.68
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Potassium Dichromate, 0.1 N, 25.00 mL Glass amberSKU: CP203900-25C-EAManufacturer: Reagents IncPotassium Dichromate, 0.1 N, 25.00 mL Glass amber (1 per EA )Learn Morewas $21.00 Special Price $16.15 -
Iodine, 0.1 N Solution, USP Volumetric Solution, 500mL, CAS# 7553-56-2SKU: I-118-500MLGL-EAManufacturer: Spectrum ChemicalIodine, 0.1 N Solution, USP Volumetric Solution is a ready-to-use chemical solution used in the analysis of many finished USP grade products. Spectrum Chemical USP products are manufactured, packaged and stored under current Good Manufacturing Practices (cGMP) per 21CFR part 211 in FDA registered and inspected facilities. (1 per EA )Learn Morewas $72.20 Special Price $58.75 -
Barium Hydroxide, Saturated Solution, 1L, Poly BottleSKU: LC116402-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: UN3266 (1 per EA)Learn Morewas $167.30 Special Price $125.47 -
Bleach Reagent #1, 2 oz, Dropper BottleSKU: R-0664-C-DB-EAManufacturer: Taylor TechnologiesBleach Reagent #1, 2 oz, Dropper Bottle (1 per EA)Learn Morewas $27.40 Special Price $20.93 - Buffer Solution pH 9.0, 1L, Poly BottleSKU: LC124402-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $56.40 Special Price $42.30
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Sodium Cobaltinitrite TS - 100mLSKU: TS14253-100ml-EAManufacturer: Dawn ScientificSodium Cobaltinitrite TS - 100mL (1 per EA )Learn Morewas $185.62 Special Price $180.98 -
Sodium Hydroxide Reagent (1 drop = 1 g/100 mL H₂SO₄, H₃PO₄, or H₃NSO₃)SKU: R-0740-C-EAManufacturer: Taylor TechnologiesSodium Hydroxide Reagent (1 drop = 1 g/100 mL H₂SO₄, H₃PO₄, or H₃NSO₃) (1 per EA)Learn Morewas $23.54 Special Price $17.99 -
Acid Digestion Reagent (19Th Ed.), 4L, Poly BottleSKU: LC105604-EAManufacturer: LabChemShelf Life (months): 12, , UN Number: UN2796 (1 per EA)Learn Morewas $260.50 Special Price $195.37 -
Sulfuric Acid Reagent, 2 oz, Dropper BottleSKU: R-0691-C-EAManufacturer: Taylor TechnologiesSulfuric Acid Reagent, 2 oz, Dropper Bottle (1 per EA)Learn Morewas $26.42 Special Price $20.18 -
Glucose-Glutamic Acid, 24X6ML, VialSKU: LC14845246-PKManufacturer: LabChemShelf Life (months): 24, , UN Number: (24 per PK )Learn Morewas $129.80 Special Price $97.35 - Hydroxylamine HCl, 5% w/v, 1.00 L Poly naturalSKU: CH144200-1A-EAManufacturer: Reagents IncHydroxylamine HCl, 5% w/v, 1.00 L Poly natural (1 per EA )Learn Morewas $112.00 Special Price $84.24
- Mercuric Acetate TS, 500.00 mL Glass amberSKU: CM102200-500C-EAManufacturer: Reagents IncMercuric Acetate TS, 500.00 mL Glass amber (1 per EA )Learn Morewas $231.00 Special Price $172.80
- Sulfuric Acid, 0.2N (0.1M), 500ML, Poly BottleSKU: LC257001-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: UN2796 (1 per EA)Learn Morewas $31.80 Special Price $24.46
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Picric Acid, Saturated Aqueous Solution, 1L, CAS# 88-89-1SKU: P-201-1LT-EAManufacturer: Spectrum ChemicalPicric Acid, Saturated Aqueous Solution is used in the production of explosives, matches, and electric batteries. 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 $108.50 Special Price $88.28 - Sodium Hydroxide, 0.5 N, 10.00 L CubitainerSKU: C7318250-10F-EAManufacturer: Reagents IncSodium Hydroxide, 0.5 N, 10.00 L Cubitainer (1 per EA )Learn Morewas $144.00 Special Price $108.00
- Sodium Hydroxide, 0.05N (0.05M), 500ML, Poly BottleSKU: LC242501-EAManufacturer: LabChemShelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)Learn Morewas $25.90 Special Price $19.93
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Vario Dpd Indicator Powder 24 Grams, Ea/1SKU: 530200-EAManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 2297255. Lovibond VARIO DPD Indicator Powder, 24 Grams 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 (1 per EA)Learn More$26.90 -
Acetone-Alcohol, 1:1, 20L, Cubitainer®SKU: LC104405-EAManufacturer: LabChemShelf Life (months): 24, , UN Number: UN1993 (1 per EA)Learn Morewas $745.50 Special Price $559.13 -
Buffer Solution, pH 4.01 +/- 0.01 @ 25 DEG C, Reference StandardSKU: B1160-4LTPL-EAManufacturer: Spectrum ChemicalBuffer Solution, pH 4.01 +/- 0.01 @ 25 DEG C, Reference Standard (1 per EA )Learn Morewas $142.70 Special Price $116.11
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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
LPS 200uL Universal Pipet Tips, Yellow, Bulk, PK1000
was $20.00 Special Price $15.75
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