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. Ammonium Hydroxide, 10% v/v Solution, 3.8 L, Poly Gallon
    Manufacturer: 710 Spirits Rocky Mtn Reagents
    Ammonium Hydroxide, 10% v/v Solution, 3.8 L, Poly Gallon (1 per EA )
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    $42.70
  2. TKN Digestion Reagent, 4.00 L Poly natural
    Manufacturer: Reagents Inc
    TKN Digestion Reagent, 4.00 L Poly natural (1 per EA )
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    was $439.00 Special Price $337.72
  3. Toluene/MEK, 85:15, 4.00 L Glass amber
    Manufacturer: Reagents Inc
    Toluene/MEK, 85:15, 4.00 L Glass amber (1 per EA )
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    was $115.00 Special Price $88.47
  4. Trichloroacetic Acid, 50 Percent (w/v) Aqueous Solution, 1L, CAS# 76-03-9
    Manufacturer: Spectrum Chemical
    Trichloroacetic Acid, 50 Percent (w/v) Aqueous Solution and other TCA solutions are used, depending upon grade and purity, in biochemistry to help the precipitation of macromolecules, cosmetics, topical medication preparations and in the production of pesticides. 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 $790.20 Special Price $642.99
  5. Vario Ferro, F25 1000 Pack, Ea/1
    Manufacturer: Lovibond Tintometer Group
    Direct Replacement for Hach P/N 85428. (1 per EA )
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    $301.18
  6. Potassium Nitrate, 1 M, 1.00 L Poly natural
    Manufacturer: Reagents Inc
    Potassium Nitrate, 1 M, 1.00 L Poly natural (1 per EA )
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    was $240.00 Special Price $180.36
  7. Potassium Dichromate, 0.1N (0.0167M), 4L, Poly Bottle
    Manufacturer: LabChem
    Shelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)
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    was $112.70 Special Price $84.52
  8. Mercuric Nitrate, 0.0171N (0.0086M), 1L, Amber Glass
    Manufacturer: LabChem
    Shelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)
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    was $79.80 Special Price $59.85
  9. Alum Solution 10% W/V, 1L, Poly Bottle
    Manufacturer: LabChem
    Shelf Life (months): 24, , UN Number: (1 per EA)
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    was $117.70 Special Price $88.28
  10. Vario Ferroin Indicator 100 ML
    Manufacturer: Lovibond Tintometer Group
    Direct Replacement for Hach P/N 181233. Lovibond Vario Ferroin Indicator, 100 ml (1 per EA)
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    $22.52
  11. Cupric Nitrate, 0.05 Molar, 3.8 L, Poly Gallon
    Manufacturer: 710 Spirits Rocky Mtn Reagents
    Cupric Nitrate, 0.05 Molar, 3.8 L, Poly Gallon (1 per EA )
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    $69.35
  12. Lanthanum Solution, 500ML, Poly Bottle
    Manufacturer: LabChem
    Shelf Life (months): 24, , UN Number: UN1789 (1 per EA)
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    was $128.50 Special Price $96.38
  13. Acetic Acid, 6.0N (6.0M), 4L, Poly Bottle
    Manufacturer: LabChem
    Shelf Life (months): 24, Traceable to NIST, UN Number: UN2790 (1 per EA)
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    was $114.70 Special Price $86.02
  14. Sodium Arsenite, 0.1N (0.05M), 1L, Poly Bottle
    Manufacturer: LabChem
    Shelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)
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    was $111.00 Special Price $83.25
  15. Potassium Biiodate, 0.0375N (0.00313M), 1L, Poly Bottle
    Manufacturer: LabChem
    Shelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)
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    was $95.90 Special Price $71.93
  16. Sulfuric Acid, 0.02 N Solution, APHA, 4L, CAS# 7664-93-9
    Manufacturer: Spectrum Chemical
    Sulfuric Acid, 0.02 N Solution, APHA - As an APHA certified solution, this item is meets the ASTM D1209 standards and can be used in water and waste water treatment facilities to determine the concentration of dissolved and particulate materials. Spectrum Chemical manufactured APHA grade products meet the toughest regulatory standards for quality and purity.

    (1 per EA )
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    was $128.40 Special Price $104.48
  17. Potassium Fluoride, 10% w/v Solution, 1 L, Poly
    Manufacturer: 710 Spirits Rocky Mtn Reagents
    Potassium Monofluoride, Dihydrate (1 per EA)
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    $42.60
  18. Chloroacetic Acid Buffer, 1 L, Poly
    Manufacturer: 710 Spirits Rocky Mtn Reagents
    Chloroacetic Acid Buffer, 1 L, Poly (1 per EA )
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    $74.85
  19. TAE 10X Solution, TRIS Acetate EDTA 10X Solution, 4 Liters
    Manufacturer: Research Products International
    Mol. Wt: Common Name: TRIS Acetate EDTA 10X Solution Formula: Dimensions: 7.00 x 10.50 x 4.50 Weight: 9.3 - Research or further manufacturing use only, not for food or drug use. (1 per EA)
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    $137.10
  20. Formaldehyde 10% V/V Buffered, 1L, Poly Bottle
    Manufacturer: LabChem
    Shelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)
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    was $44.90 Special Price $33.67
  21. Sodium Carbonate, 1.0 M (2.0N), 1L, Poly Bottle
    Manufacturer: LabChem
    Shelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)
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    was $87.90 Special Price $65.92
  22. Vario Starch Indicator 100 ML
    Manufacturer: Lovibond Tintometer Group
    Direct Replacement for Hach P/N 34932. Lovibond Vario Starch Indicator, 100 ml (1 per EA)
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    was $22.00 Special Price $18.07
  23. Sodium Thiosulfate, 1.0 N Aqueous Solution, 500mL, CAS# 10102-17-7
    Manufacturer: Spectrum Chemical
    Sodium Thiosulfate, 1.0 N Aqueous Solution - 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.

    (1 per EA )
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    was $45.60 Special Price $37.11
  24. Buffer Solution, pH 10.00 +/-0.02 @ 25 DEG C, Reference Standard, 4L
    Manufacturer: Spectrum Chemical
    Buffer Solution, pH 10.00 +/-0.02 @ 25 DEG C, Reference Standard are solutions mainly utilized to keep pH at a constant value in a variety of chemical applications. 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 $141.25 Special Price $114.93
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