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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Dimethylglyoxime, 1% Alcoholic, 120.00 mL Poly naturalSKU: CD261000-120A-EAManufacturer: Reagents IncDimethylglyoxime, 1% Alcoholic, 120.00 mL Poly natural (1 per EA )Learn Morewas $36.50 Special Price $27.00 -
Sodium Carboxymethylcellulose, (Viscosity of 2 Percent Aqueous Solution @ 25 DEG C: 34.0-50.0 cP), USP, 2.5kg, CAS# 9004-32-4SKU: C4622-2.5KG-EAManufacturer: Spectrum ChemicalSodium Carboxymethylcellulose, (Viscosity of 2 Percent Aqueous Solution @ 25 DEG C: 34.0-50.0 cP), USP, 2.5kg, CAS# 9004-32-4 (1 per EA )Learn Morewas $1,175.70 Special Price $869.69 - Alkaline-Iodide-Azide, Pomeroy, 500.00 mL Poly naturalSKU: CA014600-500A-EAManufacturer: Reagents IncAlkaline-Iodide-Azide, Pomeroy, 500.00 mL Poly natural (1 per EA )Learn Morewas $352.00 Special Price $270.80
- Buffer, pH 5.00, 4.00 L CubitainerSKU: C2155250-4F-EAManufacturer: Reagents IncBuffer, pH 5.00, 4.00 L Cubitainer (1 per EA )Learn Morewas $100.00 Special Price $74.52
- Kjeldahl Solution, 4.00 L Poly naturalSKU: C2220050-4A-EAManufacturer: Reagents IncKjeldahl Solution, 4.00 L Poly natural (1 per EA )Learn Morewas $79.00 Special Price $59.40
- Methylene Chloride:EtOH 2:3v/v, 1.00 L Glass amberSKU: CM010200-1C-EAManufacturer: Reagents IncMethylene Chloride:EtOH 2:3v/v, 1.00 L Glass amber (1 per EA )Learn Morewas $104.00 Special Price $77.76
- Methanol, 4% w/v, 500.00 mL Glass amberSKU: CM002600-500C-EAManufacturer: Reagents IncMethanol, 4% w/v, 500.00 mL Glass amber (1 per EA )Learn Morewas $78.00 Special Price $58.32
- Acetic Acid, 50% v/v, 20.00 L Winpak blueSKU: C7100610-20E7-EAManufacturer: Reagents IncAcetic Acid, 50% v/v, 20.00 L Winpak blue (1 per EA )Learn Morewas $501.00 Special Price $375.84
- Dimethylamine, 26% w/v, 4.00 L glass sc ambSKU: CD261100-4C1-EAManufacturer: Reagents IncDimethylamine, 26% w/v, 4.00 L glass sc amb (1 per EA )Learn Morewas $571.00 Special Price $428.76
- Potassium Hydroxide, 0.02 N, 20.00 L CubitainerSKU: CP115300-20F-EAManufacturer: Reagents IncPotassium Hydroxide, 0.02 N, 20.00 L Cubitainer (1 per EA )Learn Morewas $144.00 Special Price $108.00
- Hydrochloric Acid, 0.25 N, 20.00 L CubitainerSKU: C7101070-20F-EAManufacturer: Reagents IncHydrochloric Acid, 0.25 N, 20.00 L Cubitainer (1 per EA )Learn Morewas $197.00 Special Price $147.96
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Methyl Red-Methylene Blue TS - 100mLSKU: TS14172-100ml-EAManufacturer: Dawn ScientificMethyl Red-Methylene Blue TS - 100mL (1 per EA )Learn Morewas $54.62 Special Price $53.25 - Cupric Citrate TS, Alkaline - 500mLSKU: TS14085-500ml-EAManufacturer: Dawn ScientificCupric Citrate TS, Alkaline - 500mL (1 per EA )Learn Morewas $199.62 Special Price $194.63
- Methyl Red-Methylene Blue TS - 500mLSKU: TS14172-500ml-EAManufacturer: Dawn ScientificMethyl Red-Methylene Blue TS - 500mL (1 per EA )Learn Morewas $95.62 Special Price $93.23
- Buffer, Hydrion(R), TriChek, Chemenvelope SetSKU: B1756-1SET-EAManufacturer: Spectrum ChemicalBuffer, Hydrion(R), TriChek, Chemenvelope Set - The Hydrion Tri-Chek Buffer Chemvelope Calibration Set is perfect for quick and easy pH meter calibration. When mixed with distilled or de-ionized water, Hydrion Buffer Chemvelopes will accurately produce 500 ml of solution at pH 4.00, 7.00 and 10.00. Hydrion Buffers are free flowing soluble powders that prepare clear or color safe solutions in minutes. The set contains three Chemvelopes at pH 4.00, four Chemvelopes at pH 7.00 and three Chemvelopes at pH 10.00. Each Chemvelope produces 500 ml of solution. Included with the set is 1 vial of Hydrion Color Key Buffer Preservative which prolongs the shelf life of the solution and automatically tints each solution to its own color value: orange for ph 4.00, green for ph 7.0 and blue for ph 10.0. (1 per EA )Learn More$136.80
- Sodium Hydroxide, SVS Concentrate, To Prepare 0.01 N Solution, 1UNIT, CAS# 1310-73-2SKU: SV225-1UNIT-CSManufacturer: Spectrum ChemicalSodium Hydroxide, SVS Concentrate, To Prepare 0.01 N Solution (6 per CS )Learn More$383.55
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Vario Dpd Free, F5 1000 PackSKU: 530093-PKManufacturer: Lovibond Tintometer GroupDirect Replacement for Hach P/N 1407728. Lovibond VARIO DPD Free, F5, 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 p (1000 per PK )Learn More$224.40 - Zinc Acetate, 2 N APHA, 120.00 mL Poly naturalSKU: CZ111500-120A-EAManufacturer: Reagents IncZinc Acetate, 2 N APHA, 120.00 mL Poly natural (1 per EA )Learn Morewas $38.00 Special Price $29.24
- Alkaline-Iodide-Azide, Pomeroy, 1.00 L Poly naturalSKU: CA014600-1A-EAManufacturer: Reagents IncAlkaline-Iodide-Azide, Pomeroy, 1.00 L Poly natural (1 per EA )Learn Morewas $653.00 Special Price $502.36
- Tetrabutylamm Hydroxide, 0.2 N, 1.00 L Glass amberSKU: CT004000-1C-EAManufacturer: Reagents IncTetrabutylamm Hydroxide, 0.2 N, 1.00 L Glass amber (1 per EA )Learn Morewas $1,530.00 Special Price $1,177.06
- Vanadate-Molybdate Reagent, 10.00 L CubitainerSKU: CV102000-10F-EAManufacturer: Reagents IncVanadate-Molybdate Reagent, 10.00 L Cubitainer (1 per EA )Learn Morewas $582.00 Special Price $447.74
- Salicylate-Nitroprusside, EPA, 4.00 L CubitainerSKU: CS007200-4F-EAManufacturer: Reagents IncSalicylate-Nitroprusside, EPA, 4.00 L Cubitainer (1 per EA )Learn Morewas $625.00 Special Price $480.82
- Water Hardness Buffer w/o Mg, 500.00 mL Poly naturalSKU: CW000700-500A-EAManufacturer: Reagents IncWater Hardness Buffer w/o Mg, 500.00 mL Poly natural (1 per EA )Learn Morewas $40.00 Special Price $30.78
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Pd 250 Reagent Refill, Total Chlorine 2 X 250 Tests, Ea/1SKU: 530150-EAManufacturer: Lovibond Tintometer GroupLovibond PD 250 Reagent Refill, VARIO Total Chlorine, 2 X 250 Tests 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 pro (1 per EA)Learn More$125.60
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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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