Solutions are used in practically every lab, for a broad range of processes.  Lab Procurement Services carries an extensive collection of products to handle our customers' diverse requirements, including various titrimetric and other wet methods.  Please be sure to visit our pH Buffers category for all of your electrochemistry calibration needs, and our Beakers and Flasks collections to view our offerings of those essential items.

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.

Buffers and Solutions

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  1. Buffer, Hydrion(R), Dry, pH 2.00 +/- 0.02, 1PC, CAS# 14882-18-9
    Manufacturer: Spectrum Chemical
    Buffer, Hydrion(R), Dry, pH 2.00 +/- 0.02 - This product contains 5 envelopes in glass bottle and each envelope is triple-layered to keep buffer completely dry and free-flowing. Hydrion is a registered trademark of Micro Essential Laboratory, Inc. and is reconstituted to a precise buffer solution by dissolving contents of envelope in 500 mL distilled water.

    (1 per EA )
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    $97.15
  2. Vario Aluminum Reagent Set 100 Tests, Ea/1
    Manufacturer: Lovibond Tintometer Group
    Direct Replacement for Hach P/N 2603700. Lovibond VARIO Aluminum Reagent Set, 100 Tests Includes: 531620, VARIO Aluminum ECR Reagent, F20 - 100 ct. 531650, VARIO Hexamethylenetetramine, F20 - 100 ct. 531625, VARIO ECR Masking Reagent Solution - 25 ml (1 per EA)
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    $211.80
  3. Sulfuric Acid 50% V/V (1+1), 2.5L, Clear Glass
    Manufacturer: LabChem
    Shelf Life (months): 24, Traceable to NIST, UN Number: UN1830 (1 per EA)
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    was $143.10 Special Price $110.08
  4. Davis Reagent, 1.00 L Glass amber
    Manufacturer: Reagents Inc
    Davis Reagent, 1.00 L Glass amber (1 per EA )
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    was $210.00 Special Price $157.68
  5. Sodium Citrate Buffer, 10% w/v, 4.00 L Poly natural
    Manufacturer: Reagents Inc
    Sodium Citrate Buffer, 10% w/v, 4.00 L Poly natural (1 per EA )
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    was $178.00 Special Price $133.92
  6. Vario Silica Lr Reagent Set, F10 100 Tests, Ea/1
    Manufacturer: Lovibond Tintometer Group
    Direct Replacement for Hach P/N 2459300. Lovibond VARIO Silica LR Reagent Set, 10 ml Sample, 100 Tests Includes: 531600, VARIO Amino Acid F Reagent, F10 - 100 ct. 531710, VARIO Citric Acid Reagent, F10 - 2 x 100 ct. 531730, VARIO Molybdate 3 Reagent Sol (1 per EA)
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    $100.10
  7. EDTA Disodium, 0.1 M Solution, 20L, CAS# 23411-34-9
    Manufacturer: Spectrum Chemical
    EDTA Disodium, 0.1 M Solution, is also referred to as Ethylenediaminetetraacetic acid. The EDTA is extremely good at binding metals. This property is useful in complexometric titrations for the determination of metal levels.

    (1 per EA )
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    $820.55
  8. Dibasic Sodium Phosphate TS, (U.S.P. Test Solution), 100mL, CAS# 10039-32-4
    Manufacturer: Spectrum Chemical
    Dibasic Sodium Phosphate TS, (U.S.P. Test Solution) is a ready-for-use solution for the purpose of conducting USP, National Formulary and assay tests and is prepared according to the specifications of the USP Pharmacopeial Convention.

    (1 per EA )
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    was $292.50 Special Price $281.28
  9. Caustic Blue Indicator, 0.1%, 50.00 mL Glass amber
    Manufacturer: Reagents Inc
    Caustic Blue Indicator, 0.1%, 50.00 mL Glass amber (1 per EA )
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    was $59.00 Special Price $44.28
  10. Sodium Thiosulfate, 30% w/v, 20.00 L Cubitainer
    Manufacturer: Reagents Inc
    Sodium Thiosulfate, 30% w/v, 20.00 L Cubitainer (1 per EA )
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    was $200.00 Special Price $150.12
  11. Glutaraldehyde, 24 Percent Aqueous Solution, 4L, CAS# 111-30-8
    Manufacturer: Spectrum Chemical
    Glutaraldehyde, 24 Percent Aqueous Solution - 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 )
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    $598.00
  12. Sodium Formate Buffer, pH 2.9, 1.00 L Poly natural
    Manufacturer: Reagents Inc
    Sodium Formate Buffer, pH 2.9, 1.00 L Poly natural (1 per EA )
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    was $145.00 Special Price $109.08
  13. Calcium sulfate TS - 500mL
    Manufacturer: Dawn Scientific
    Calcium sulfate TS - 500mL (1 per EA )
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    was $204.62 Special Price $199.51
  14. Vario Deha 2 Reagent 100 ML, Ea/1
    Manufacturer: Lovibond Tintometer Group
    Direct Replacement for Hach P/N 2168042. Lovibond VARIO DEHA-2 Reagent Solution, 100 ml (1 per EA)
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    $30.20
  15. Phosphate Buffered Saline, 10X Solution, 4 X 4 Liters
    Manufacturer: Research Products International
    Dimensions: 11.50 X 12.00 X 11.50 Weight: 37 - Research or further manufacturing use only, not for food or drug use. (4 per CS )
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    $552.50
  16. Dragendorff's TS - 500mL
    Manufacturer: Dawn Scientific
    Dragendorff's TS - 500mL (1 per EA )
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    was $59.62 Special Price $58.13
  17. Midget, Iron, 0-2.0 ppm
    SKU: 5112-EA
    Manufacturer: Taylor Technologies
    Midget, Iron, 0-2.0 ppm (1 per EA )
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    was $0.91 Special Price $0.82
  18. Sodium Hydroxide, 50 Percent (w/w), Solution, Reagent, 500mL, CAS# 1310-73-2
    Manufacturer: Spectrum Chemical
    Sodium Hydroxide, 50 Percent (w/w), Solution, Reagent is commonly known as Caustic soda. This inorganic compound is water soluble, as well as in ethanol and methanol. The dissolution of solid Sodium Hydroxide in water creates a highly exothermic reaction. The concentrated solution is suitable for further dilution or as a raw material feedstock in chemical synthetic transformations. As a Reagent grade item, Spectrum Chemical manufactured Sodium Hydroxide met the toughest regulatory standards for quality and purity.

    (6 per CS )
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    was $584.80 Special Price $519.11
  19. Hydrochloric Acid, 1.0 N/IPA, 1.00 L Glass amber
    Manufacturer: Reagents Inc
    Hydrochloric Acid, 1.0 N/IPA, 1.00 L Glass amber (1 per EA )
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    was $80.00 Special Price $60.48
  20. Buffer, pH 1.00, 10.00 L Cubitainer
    Manufacturer: Reagents Inc
    Buffer, pH 1.00, 10.00 L Cubitainer (1 per EA )
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    was $150.00 Special Price $112.32
  21. Indicator 1, Bromophenol Blue, 1.00 L Poly natural
    Manufacturer: Reagents Inc
    Indicator 1, Bromophenol Blue, 1.00 L Poly natural (1 per EA )
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    was $53.00 Special Price $39.96
  22. Pd 250 Reagent Refill, Vario Free Chlorine 1 X 250 Tests, Ea/1
    Manufacturer: Lovibond Tintometer Group
    Direct Replacement for Hach P/N 2105560. 530146, PD 250 Reagent Refill, VARIO Free Chlorine 250 pcs Suitable for colorimetric and photometric determination of Free Chlorine with powder dispenser PD 250 The PD250 is designed for easy and controlled dosa (1 per EA )
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    $62.40
  23. Sulfuric Acid, 0.5 N, 20.00 L Cubitainer
    Manufacturer: Reagents Inc
    Sulfuric Acid, 0.5 N, 20.00 L Cubitainer (1 per EA )
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    was $188.00 Special Price $141.48
  24. PAN Indicator, 0.3% / Ethanol, 500.00 mL Glass amber
    Manufacturer: Reagents Inc
    PAN Indicator, 0.3% / Ethanol, 500.00 mL Glass amber (1 per EA )
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    was $182.00 Special Price $136.08
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