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. Sodium Bisulfite, 38% w/v, 4.00 L Poly natural
    Manufacturer: Reagents Inc
    Sodium Bisulfite, 38% w/v, 4.00 L Poly natural (1 per EA )
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    was $316.00 Special Price $236.52
  2. Sulfuric Acid, 20 Percent (v/v) Solution, 4L, CAS# 7664-93-9
    Manufacturer: Spectrum Chemical
    Sulfuric Acid, 20 Percent (v/v) Solution - Spectrum utilizes the highest quality raw materials appropriate to your product. Most raw materials meet or exceed the specifications established by the American Chemical Society. Where appropriate, many finished products are traceable to NIST Standard Reference Materials. Manufacturing, quality control testing, and packaging are all performed in Spectrum’s own facilities. Record keeping and sample retention of all produced lots ensure product consistency and complete traceability.

    (1 per EA )
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    was $81.75 Special Price $66.52
  3. Buffer Solution, pH 7.00 +/- 0.01 @ 25 DEG C, Reference Standard, 500mL
    Manufacturer: Spectrum Chemical
    Buffer Solution, pH 7.00 +/- 0.01 @ 25 DEG C, Reference Standard is an inorganic solution in water. Spectrum solutions utilize the highest quality raw materials appropriate to your product. Most raw materials meet or exceed the specifications established by the American Chemical Society. Where appropriate, many finished products are traceable to NIST Standard Reference Materials. Manufacturing, quality control testing, and packaging are all performed in Spectrum's own facilities. Record keeping and sample retention of all produced lots ensure product consistency and complete traceability.

    (6 per CS )
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    was $255.30 Special Price $207.73
  4. Sulfuric Acid, 0.25N (0.125M), 20L, Cubitainer®
    Manufacturer: LabChem
    Shelf Life (months): 24, Traceable to NIST, UN Number: UN2796 (1 per EA)
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    was $230.60 Special Price $177.41
  5. Stannous Chloride Reagent I, 500ML, Poly Bottle
    Manufacturer: LabChem
    Shelf Life (months): 24, , UN Number: (1 per EA)
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    was $171.40 Special Price $131.86
  6. Sodium Hydroxide 10% W/W, 4L, Poly Bottle
    Manufacturer: LabChem
    Shelf Life (months): 24, Traceable to NIST, UN Number: UN1824 (1 per EA)
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    was $98.70 Special Price $75.93
  7. Yellow-Seven(TM) Buffer Solution, pH 7.00 (+/-0.01 @ 25 DEG C), Color-coded Yellow, Reference Standard
    Manufacturer: Spectrum Chemical
    Yellow-Seven (TM) Buffer Solution, pH 7.00 (+/-0.01 @ 25 DEG C), Color-coded Yellow, Reference Standard is an inorganic solution in water. Spectrum solutions utilize the highest quality raw materials appropriate to your product. Most raw materials meet or exceed the specifications established by the American Chemical Society. Where appropriate, many finished products are traceable to NIST Standard Reference Materials. Manufacturing, quality control testing, and packaging are all performed in Spectrum’s own facilities. Record keeping and sample retention of all produced lots ensure product consistency and complete traceability.

    (6 per CS )
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    was $243.10 Special Price $197.80
  8. EDTA Disodium, 0.0575 M Solution, 4L, CAS# 6381-92-6
    Manufacturer: Spectrum Chemical
    EDTA Disodium, 0.0575 M 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.

    (4 per CS )
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    was $628.85 Special Price $511.69
  9. Sodium Thiosulfate 8% W/V, 1L, Poly Bottle
    Manufacturer: LabChem
    Shelf Life (months): 24, , UN Number: (1 per EA)
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    was $49.30 Special Price $37.93
  10. Glutaraldehyde, 24 Percent Aqueous Solution, 200L, 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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    $7,962.50
  11. EDTA, 0.1M EP (Sodium Edetate), 1.00 L Poly natural
    Manufacturer: Reagents Inc
    EDTA, 0.1M EP (Sodium Edetate), 1.00 L Poly natural (1 per EA )
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    was $56.00 Special Price $42.12
  12. Ferric Alum Indicator, 500.00 mL Glass amber
    Manufacturer: Reagents Inc
    Ferric Alum Indicator, 500.00 mL Glass amber (1 per EA )
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    was $96.00 Special Price $72.36
  13. Citric Acid, 0.5% w/w, 1.00 L Poly natural
    Manufacturer: Reagents Inc
    Citric Acid, 0.5% w/w, 1.00 L Poly natural (1 per EA )
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    was $74.00 Special Price $55.08
  14. Sulfuric Acid, 93% (66° Baume), 190.00 L Drum
    Manufacturer: Reagents Inc
    Sulfuric Acid, 93% (66° Baume), 190.00 L Drum (1 per EA )
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    was $1,470.00 Special Price $1,102.68
  15. Ferric Chloride Acid Solution, 100.00 mL Poly natural
    Manufacturer: Reagents Inc
    Ferric Chloride Acid Solution, 100.00 mL Poly natural (1 per EA )
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    was $37.50 Special Price $28.08
  16. Citric Acid Monohydrate Pure, 3.00 K Poly natural
    Manufacturer: Reagents Inc
    Citric Acid Monohydrate Pure, 3.00 K Poly natural (1 per EA )
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    was $394.00 Special Price $295.92
  17. Hydrogen Sulfide Water, Solution, 500mL, CAS# 2148878
    Manufacturer: Spectrum Chemical
    Hydrogen Sulfide Water, Solution can be used in the degradation of biopolymers. 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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    was $281.65 Special Price $229.19
  18. Sodium Sulfate Buffer, 1.00 L Poly natural
    Manufacturer: Reagents Inc
    Sodium Sulfate Buffer, 1.00 L Poly natural (1 per EA )
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    was $147.00 Special Price $110.16
  19. Sodium Hydride, 60 Percent Dispersion in Mineral Oil, 500g, CAS# 7646-69-7
    Manufacturer: Spectrum Chemical
    Sodium Hydride, 60 Percent Dispersion in Mineral Oil, a chemical compound, can be used in organic synthesis as a strong base, as well as a drying agent to dry organic solvents. 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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    $619.95
  20. Hyamine Solution, 0.005 M (N), 1.00 L Glass amber
    Manufacturer: Reagents Inc
    Hyamine Solution, 0.005 M (N), 1.00 L Glass amber (1 per EA )
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    was $164.00 Special Price $123.12
  21. Hardness Reagent .001M, gal
    Manufacturer: Taylor Technologies
    Hardness Reagent .001M, gal (1 per EA)
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    was $100.73 Special Price $0.10
  22. Acid Ferric Chloride TS - 500mL
    Manufacturer: Dawn Scientific
    Acid Ferric Chloride TS - 500mL (1 per EA )
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    was $79.62 Special Price $77.63
  23. Propylene Glycol 30% v/v Aq., 200.00 L Drum
    Manufacturer: Reagents Inc
    Propylene Glycol 30% v/v Aq., 200.00 L Drum (1 per EA )
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    was $3,080.00 Special Price $2,310.12
  24. Pot Bromide, 11.9g/L /10% HCl, 10.00 L Cubitainer
    Manufacturer: Reagents Inc
    Pot Bromide, 11.9g/L /10% HCl, 10.00 L Cubitainer (1 per EA )
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    was $116.00 Special Price $87.48
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