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. TISAB III, with CDTA, 500.00 mL Poly natural
    Manufacturer: Reagents Inc
    TISAB III, with CDTA, 500.00 mL Poly natural (1 per EA )
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    was $110.00 Special Price $84.62
  2. Boric Acid 2% W/V With Indicator, 1L, Poly Bottle
    Manufacturer: LabChem
    Shelf Life (months): 1, , UN Number: (1 per EA)
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    was $107.30 Special Price $80.47
  3. Ammonium Vanadate TS - 500mL
    Manufacturer: Dawn Scientific
    Ammonium Vanadate TS - 500mL (1 per EA )
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    was $72.62 Special Price $70.80
  4. Hydrogen Peroxide, 30 Percent, Solution, Reagent, 500mL, CAS# 7722-84-1
    Manufacturer: Spectrum Chemical
    Hydrogen Peroxide, 30 Percent, Solution, Reagent is the simplest peroxide, a strong oxidizer that appears as a clear and slightly viscous liquid. Its oxidizing properties are so strong that it is considered a highly reactive oxygen species. Due to it being a weak acid, it can form thermally unstable hydroperoxides. One of its biggest uses is in the treatment of drinking water, removing odors, organic materials and the amount of Hydrogen sulfides and Iron. As a Reagent grade, Spectrum Chemical manufactured Hydrogen Peroxide is a high quality chemical suitable for use in many analytical and general laboratory applications.

    (6 per CS )
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    was $1,489.70 Special Price $1,212.16
  5. Phosphate Buffered Saline, 10X Solution, 1 Liter
    Manufacturer: Research Products International
    Mol. Wt: Common Name: Phosphate Buffered Saline 10X Sterile Solution Formula: Dimensions: 5.50 x 8.00 x 2.00 Weight: 2.63 - Research or further manufacturing use only, not for food or drug use. (1 per EA)
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    $55.05
  6. Barbituric Acid 98%, 100.00 g Glass amb wm
    Manufacturer: Reagents Inc
    Barbituric Acid 98%, 100.00 g Glass amb wm (1 per EA )
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    was $196.00 Special Price $146.88
  7. TE Buffer, 10X Powder, 158.35 Grams of Powder, Makes 10 Liters of Solution
    Manufacturer: Research Products International
    Dimensions: 3.50 x 3.75 x 3.50 Weight: 0.44 - Research or further manufacturing use only, not for food or drug use. (1 per EA)
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    $24.45
  8. Isopropyl Alcohol, 70% v/v Technical, 5 gal, Poly Pail CAS# 67-63-0
    Manufacturer: 710 Spirits Rocky Mtn Reagents
    Isopropyl Alcohol, 70% v/v Technical, 5 gal, Poly Pail CAS# 67-63-0 (1 per EA)
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    $98.40
  9. TRIS BASE, 40% SOLUTION, 4 LITER CAS# 77-86-1
    Manufacturer: Research Products International
    Product usually ships within 24 hours. This product is sold for laboratory research use only. Dimensions: 7.00 x 12.00 x 4.00, Weight: 10.11, Cas#: 77-86-1 Research or further manufacturing use only, not for food or drug use. (1 per EA)
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    $131.70
  10. Dimethylamine, 26% w/v, 1.00 L Glass amber
    Manufacturer: Reagents Inc
    Dimethylamine, 26% w/v, 1.00 L Glass amber (1 per EA )
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    was $153.00 Special Price $114.48
  11. pHenylarsine Oxide, 0.0375N (0.01875M), 1L, Amber Glass
    Manufacturer: LabChem
    Shelf Life (months): 12, Traceable to NIST, UN Number: (1 per EA)
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    was $299.80 Special Price $224.85
  12. Hyamine Solution, 0.004 M (N), 10.00 L Cubitainer
    Manufacturer: Reagents Inc
    Hyamine Solution, 0.004 M (N), 10.00 L Cubitainer (1 per EA )
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    was $291.00 Special Price $218.16
  13. TAE 10X Solution, TRIS Acetate EDTA 10X Solution, 1 Liter
    Manufacturer: Research Products International
    Mol. Wt: Common Name: TRIS Acetate EDTA 10X Solution Formula: Dimensions: 5.25 x 7.50 x 2.25 Weight: 2.62 - Research or further manufacturing use only, not for food or drug use. (1 per EA)
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    $46.00
  14. Potassium Hydroxide, 20 Percent (w/v) Aqueous Solution, 500mL, CAS# 1310-58-3
    Manufacturer: Spectrum Chemical
    Potassium Hydroxide, 20 Percent (w/v) 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 $55.65 Special Price $45.28
  15. Formaldehyde TS - 100mL
    Manufacturer: Dawn Scientific
    Formaldehyde TS - 100mL (1 per EA )
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    was $39.62 Special Price $38.63
  16. Potassium Hydroxide 45% W/W, 1L, Poly Bottle
    Manufacturer: LabChem
    Shelf Life (months): , Traceable to NIST, UN Number: UN1814 (1 per EA)
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    was $72.40 Special Price $54.30
  17. Potassium Iodide, 20 Percent (w/v) Aqueous Solution, 4L, CAS# 7681-11-0
    Manufacturer: Spectrum Chemical
    Potassium Iodide, 20 Percent (w/v) 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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    was $588.10 Special Price $478.53
  18. Sodium Hydroxide, 5 N Aqueous Solution, 1L, CAS# 1310-73-2
    Manufacturer: Spectrum Chemical
    Sodium Hydroxide, 5 N Aqueous Solution is a standard solution of Caustic soda ideally suited for laboratory titrimetric techniques. You can rely on the quality of LabChem analytical test solutions for lot-to-lot reproducibility.

    (6 per CS )
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    was $424.10 Special Price $345.08
  19. Reagent Alcohol 50% V/V (1+1), 500ML, Poly Bottle
    Manufacturer: LabChem
    Shelf Life (months): 24, , UN Number: UN1987 (1 per EA)
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    was $49.80 Special Price $37.35
  20. Edta, 0.25M (0.5N), 500ML, Poly Bottle
    Manufacturer: LabChem
    Shelf Life (months): 24, Traceable to NIST, UN Number: (1 per EA)
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    was $97.00 Special Price $72.75
  21. Hydrochloric Acid 50% V/V (1+1), 4L, Amber Glass
    Manufacturer: LabChem
    Shelf Life (months): 36, Traceable to NIST, UN Number: UN1789 (1 per EA)
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    was $173.70 Special Price $130.28
  22. Edta 50% W/V, 500ML, Poly Bottle
    Manufacturer: LabChem
    Shelf Life (months): 24, , UN Number: (1 per EA)
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    was $123.20 Special Price $92.40
  23. Hydrochloric Acid, 0.25N (0.25M), 20L, Cubitainer®
    Manufacturer: LabChem
    Shelf Life (months): 24, Traceable to NIST, UN Number: UN1789 (1 per EA)
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    was $241.70 Special Price $181.28
  24. Hydrogen Peroxide, 35% w/w, 4.00 L Poly natural
    Manufacturer: Reagents Inc
    Hydrogen Peroxide, 35% w/w, 4.00 L Poly natural (1 per EA )
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    was $176.00 Special Price $131.76
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