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 Lactate Solution, 60 Percent, FCC, 200L, CAS# 72-17-3
    Manufacturer: Spectrum Chemical
    Sodium Lactate Solution, 60 Percent, FCC is used in food products as a preservative. The FCC grade meets the requirements of the Food Chemical Codex indicates and is suitable for all food, beverage and nutritional supplement applications. Spectrum Chemical offers over 300 Food grade chemical ingredients packaged in laboratory size bottles to production drum quantities and are manufactured, packaged and stored under current Good Manufacturing Practices (cGMP) per 21CFR part 211 in FDA registered and inspected facilities.

    (1 per EA )
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    $6,822.80
  2. Glyoxal, 40 Percent in Water
    Manufacturer: Spectrum Chemical
    Glyoxal, 40 Percent in Water is used as a crosslinker for starch-based products in the coated paper and textile industry, as well as, being used as a solubilizer and crosslinker in polymer chemistry.

    (1 per EA )
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    $7,205.10
  3. Sodium Hydroxide, 20 Percent (w/v) Solution, 200L, CAS# 1310-73-2
    Manufacturer: Spectrum Chemical
    Sodium Hydroxide, 20 Percent (w/v) Solution, also known as caustic soda or lye, is used as a strong chemical base in the manufacture of textiles, drinking water, detergents, soaps and as a drain cleaner. 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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    $2,366.45
  4. Trivalent Chromium 1.50 oz/gal, 100.00 mL Glass clear
    Manufacturer: Reagents Inc
    Trivalent Chromium 1.50 oz/gal, 100.00 mL Glass clear (1 per EA )
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    was $132.00 Special Price $101.55
  5. Vario Molybdate Hr Reagent Set, F10 100 Tests, Ea/1
    Manufacturer: Lovibond Tintometer Group
    Direct Replacement for Hach P/N 2604100. Lovibond VARIO HR Molybdenum Reagent Set, F10, 100 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 Lovi (1 per EA)
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    $149.30
  6. Sodium Hydroxide, 2 N Aqueous Solution, 200L, CAS# 1310-73-2
    Manufacturer: Spectrum Chemical
    Sodium Hydroxide, 2 N Aqueous Solution is a highly caustic metallic base combined with alkali salt. 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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    $1,291.60
  7. TISAB IV, for Fluoride ISE, 20.00 L Cubitainer
    Manufacturer: Reagents Inc
    TISAB IV, for Fluoride ISE, 20.00 L Cubitainer (1 per EA )
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    was $2,170.00 Special Price $1,669.41
  8. Trivalent Chromium 0.75 oz/gal, 100.00 mL Glass clear
    Manufacturer: Reagents Inc
    Trivalent Chromium 0.75 oz/gal, 100.00 mL Glass clear (1 per EA )
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    was $132.00 Special Price $101.55
  9. Trivalent Chromium 0.25 oz/gal, 100.00 mL Glass clear
    Manufacturer: Reagents Inc
    Trivalent Chromium 0.25 oz/gal, 100.00 mL Glass clear (1 per EA )
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    was $132.00 Special Price $101.55
  10. Tris, 0.1 M, in dil HCl, 4.00 L Poly natural
    Manufacturer: Reagents Inc
    Tris, 0.1 M, in dil HCl, 4.00 L Poly natural (1 per EA )
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    was $156.00 Special Price $120.01
  11. Morpholine, 0.2 N, 4.00 L Glass amber
    Manufacturer: Reagents Inc
    Morpholine, 0.2 N, 4.00 L Glass amber (1 per EA )
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    was $345.00 Special Price $265.41
  12. Zinc Sulfate, 9.5% with NH4OH, 1.00 L Poly natural
    Manufacturer: Reagents Inc
    Zinc Sulfate, 9.5% with NH4OH, 1.00 L Poly natural (1 per EA )
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    was $110.00 Special Price $84.62
  13. Zinc Sulfate, 10% w/v, 20.00 L Cubitainer
    Manufacturer: Reagents Inc
    Zinc Sulfate, 10% w/v, 20.00 L Cubitainer (1 per EA )
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    was $720.00 Special Price $553.91
  14. Phosphate Buffered Saline, 10X Solution, 5 Liters
    Manufacturer: Research Products International
    Dimensions: 11.00 x 11.00 x 11.00 Weight: 12 - Research or further manufacturing use only, not for food or drug use. (1 per EA )
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    $176.50
  15. Vario Pan Indicator Solution 60 ML, Ea/1
    Manufacturer: Lovibond Tintometer Group
    Direct Replacement for Hach P/N 2122426. Lovibond VARIO PAN Indicator Solution, 60 ml (1 per EA)
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    $26.00
  16. Thioacetamide TS, 4% w/v, 1.00 L Glass amber
    Manufacturer: Reagents Inc
    Thioacetamide TS, 4% w/v, 1.00 L Glass amber (1 per EA )
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    was $230.00 Special Price $176.94
  17. Ammonium Chloride, 0.1 M, 4.00 L Poly natural
    Manufacturer: Reagents Inc
    Ammonium Chloride, 0.1 M, 4.00 L Poly natural (1 per EA )
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    was $200.00 Special Price $153.87
  18. Copper Sulfate, 0.2% w/v, 4.00 L Poly natural
    Manufacturer: Reagents Inc
    Copper Sulfate, 0.2% w/v, 4.00 L Poly natural (1 per EA )
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    was $96.50 Special Price $74.24
  19. Tridecane, 1% w/v in Pyridine, 4.00 L Glass amber
    Manufacturer: Reagents Inc
    Tridecane, 1% w/v in Pyridine, 4.00 L Glass amber (1 per EA )
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    was $835.00 Special Price $642.38
  20. THF / Propylene Glycol, 4:1, 4.00 L Glass amber
    Manufacturer: Reagents Inc
    THF / Propylene Glycol, 4:1, 4.00 L Glass amber (1 per EA )
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    was $4,190.00 Special Price $3,223.43
  21. Transfer/Electro Blotting 10X Solution, 1 Liter CAS# 77-86-1, 56-40-6
    Manufacturer: Research Products International
    Dimensions: 3.50 x 8.50 x 3.50, Weight: 2.4, Cas#: 77-86-1, 56-40-6 Research or further manufacturing use only, not for food or drug use. (1 per EA)
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    $53.65
  22. Sodium Hydroxide, 3 M, Unstd, 20.00 L Cubitainer
    Manufacturer: Reagents Inc
    Sodium Hydroxide, 3 M, Unstd, 20.00 L Cubitainer (1 per EA )
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    was $207.00 Special Price $159.25
  23. Sodium Chloride, 1 N, 20.00 L Cubitainer
    Manufacturer: Reagents Inc
    Sodium Chloride, 1 N, 20.00 L Cubitainer (1 per EA )
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    was $579.00 Special Price $445.44
  24. Tris, 0.6 M, 20.00 L Cubitainer
    Manufacturer: Reagents Inc
    Tris, 0.6 M, 20.00 L Cubitainer (1 per EA )
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    was $845.00 Special Price $650.07
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