analytical and laboratory chemicals, what is a chemical, chemical definition

Analytical & Laboratory Chemicals

GFS Chemicals has been serving chemists since 1928. Founder George Frederick Smith, a practicing analytical chemist, believed in truthful and accurate reporting of specifications and believed in strengthening relationships with customers/partners.  Today GFS Chemicals continues that tradition by providing excellent customer service and continuous process improvement.   GFS Chemicals is a U.S. based chemical manufacturer with more than 90 years serving the worldwide chemical industry. GFS Manufactures a wide range of laboratory and research chemicals including but not limited to:

buffers and volumetric solutions, what is a buffer, buffer definition

Buffers & Volumetric Solutions

GFS understands that standards and reagents are vital for achieving optimal performance and compliance using analytical instrumentation. GFS is constantly improving manufacturing methods and testing capabilities to reduce variability and improve quality. GFS manufactures hundreds of Analytical Solutions and Normality Solutions. Examples include:

  • Acetic Acid/Barium Chloride/Ceric Sulfate Solutions
  • Hydrochloric Acid/Sodium Hydroxide/Sulfuric Acid Solutions
  • Disodium EDTA /Silver Nitrate/TISAB II for Fluoride Solutions
  • PH Buffers/Conductivity Standards 

primary standards, what is a primary standard, primary standard definition, lab supplies

Primary Standards

Consider GFS primary standards for use in your titrations and standardization solutions. GFS manufactures very pure primary standards that meet NIST standards. Some can be manufactured in large quantities.  Our Popular In-Stock Primary Standards include:

  • Benzoic Acid/Calcium Carbonate/Ceric Ammonium Nitrate
  • Potassium Acid Phthalate (KHP)/Sodium Tartrate Dihydrate
  • Sodium Carbonate/Sodium Oxalate/Sulfamic Acid
  • Ferrous Ethylenediammonium Sulfate/TRIS Hydroxymethylaminomethane
  • Potassium Dichromate/Potassium Bi-lodate

Organic Halogen Reagent (OHR) — Sodium Biphenyl Reagent

Organic Halogen Reagent (OHR) Sodium Biphenyl Reagent

GFS Chemicals Organic Halogen Reagent (OHR) is also known as Sodium Biphenyl Reagent. The reactive nature of the sodium biphenyl complex in ethyl diglyme ensures complete extraction of any halide species present in most any organo-halide derivative. This includes pesticides, petrochemicals, aliphatic and aromatic hydrocarbons, mixed halides and fluro-organics. Extraction of the halide into an aqueous layer allows for easy determination via titration, color reagent or ISE. OHR does this effectively and rapidly for samples that can be dissolved in an inert solvent such as toluene or ether.


  • Rapid — can be completed in 30 minutes or less.
  • Safe — protects against hazards in chemical preparation and handling.
  • Versatile — applicable to a wide range of organic materials.

Turbidity Standards, what is turbidity standards, turbidity definition

Turbidity Standards

Our Amco Clear turbidity standards are traceable to NIST Primary Standards on account of their consistent particle size and photometric accuracy via US-UV spectroscopy.  The United States EPA recognizes Amco Clear as a Primary Standard for the calibration of turbidity meters used both online and in the laboratory for the analysis of drinking water.  These time tested quality standards and calibrations kits are also essential to a variety of industry applications including petrochemicals, specialty chemicals, food and beverage, environmental, wastewater treatment, power generation and in-process water. Our Amco Clear products are:

  • ISO I7025 Accredited Laboratory
  • Accurate 1 % lot-to-lot
  • Ready to use, no dilution required
  • Completely non-toxic and non-carcinogenic
  • Guaranteed 12 months from the date of shipment
  • Customizable 
  • ​Tailored sizing and packaging options

ACS Salts

ACS Salts

GFS Chemicals offers one of the widest arrays of ACS Salts on the market today with in-stock salts in a variety of sizes. As a primary manufacturer, GFS can also manufacture and package these materials in small bottle to larger bulk sizes.  Some of our popular In-stock ACS Reagent Salts include:

  • Ammonium Chloride/Ammonium Acetate/Ammonium Persulfate
  • Barium Chloride/Calcium Carbonate/Ceric Ammonium Nitrate
  • Magnesium Nitrate/Magnesium Sulfate/Potassium Hydroxide
  • Potassium Iodide/Potassium Phosphate/Potassium Chloride
  • Sodium Borohydride/Sodium Chloride/Sodium Hydroxide
  • Sodium Sulfate/Sodium Acetate/Sodium Iodide
  • Sodium Nitrate/Sodium Peroxide/Sodium Oxalate
  • Silver Nitrate/Zinc Nitrate

karl fischer, reagents, water analysis

Karl Fischer Reagents/Trace Water Analysis

GFS offers one of the largest selections of Karl Fischer formulations on the market and has the internal technical expertise to meet your needs. We have been manufacturing KF reagents in the United States since the 1980’s. Our Watermark brand will help you save money while receiving excellent quality and service. Reagents are freshly manufactured in the U.S. and are available to ship within 24 hours. The line includes reagents for volumetric and coulometric applications, and products are available in pyridine and pyridine-free solutions. GFS Watermark® Karl Fischer Reagents are designed for use with most titrators on the market. Our coulometric reagents have an extremely high-water capacity, in excess of 1000 mg of water/100 ml charge.

  • Watermark® Karl Fischer Reagents Pyridine Free and Pyridine Based Volumetric Reagents
  • One Component and Two Component Reagents for Volumetric determination of water
  • Coulometric Reagents Karl Fischer Solvents
  • Water Standards and Reference Materials

Solvents — ACS, HPLC, what is a solvent, solvent definition

Solvents ACS, HPLC

GFS solvents offer exceptional value and superior quality for any lab application. Our customer’s know that we are committed to the highest purity requirements demanded for today’s most discriminating needs.  We offer a complete line of solvents for any lab application including:

  • HPLC for Discriminant Instrumentation Needs
  • VERITAS® for critical applications such as residue analysis
  • LC gradient grade materials
  • Ultimate grade -meets or exceeds specifications for HPLC, GC/GC-MS, LC/LC-MS and UV-Vis

high purity salts

High Purity Salts (Metals Basis)

We offer high-purity inorganic salts for sample preparation, for manufacture of AA/ ICP Standards or other applications where total metals impurities need to meet exacting requirements. For accurate results and high performance — detection in the parts-per million to parts per-billion-range — in critical environmental trace element analyses many research and quality control organizations trust GFS Chemicals.Some of Our Popular High Purity Salts include:

  • Aluminum Oxide/Manganese Dioxide
  • Ammonium Molybdate/Nickel Oxalate
  • Lead Nitrate/Rubidium Chloride
  • Lithium Bromide/Silver Sulfate

Spectrophotometric Reference Materials, what is Spectrophotometric Reference Materials, Spectrophotometric Reference Materials definition

Spectrophotometric Reference Materials

GFS Chemicals to ISO/IEC 17025:2005 for the testing of its In-Spec® line of UV/ Vis spectrophotometer standards. The In-Spec® product line makes UV/visible spectrophotometer validation accessible and easy for everyone. In-Spec® standards can be used as a quality control check and to verify the operating procedure practiced by laboratory staff. This allows the lab to ensure the data collected by the UV/Vis spectrophotometer is reliable.  The range of non-toxic, NIST traceable materials includes:

  • Photometric accuracy reference standards
  • Wavelength accuracy filters
  • Stray light filters

Dyes, Stains, and Indicators

Dyes, Stains, and Indicators

We offer a broad range of superior quality dyes, stains and indicators for numerous applications.  Dyes, Stains and Indicators Such as:

  • Amaranth/Calcein/Snazox
  • Aniline Blue/Methylene Blue/Hydroxy Naphthol Blue
  • Cresol Red/Phenol Red/Crystal Violet Reagent
  • Phenolphthalein/Phenanthrolines/Diphenylamine Reagent
  • Rhodamine/Ferric Ammonium Sulfate
  • 1,2-Cyclohexanedionedioxime/4,4’-Dicarboxy-2,2’ Biquinoline