GFS Chemicals Karl Fischer Reagents

Karl Fischer Reagents

GFS Chemicals manufactures the Watermark® Karl Fischer product line. We have one of the largest selections of Karl Fischer reagents in the industry, and the technical expertise to meet your project's needs. From volumetric and coulometric Karl Fischer reagents to certified water standards, we have the products you need in stock and ready to ship. GFS Chemicals also offers both pyridine and pyridine-free solutions. Our Watermark Karl Fischer coulometric reagents have a water capacity over 1000 mg/mL.

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Karl Fischer Product Categories

Volumetric titration is typically selected for samples in the 100 ppm to 100% water content range, although sample analysis down 10 ppm water is possible. One component Karl Fischer reagents are the most popular as they are the least expensive, and don't always require a special solvent. In one-component Karl Fischer Titration, a titrant with a known concentration is reacted with a sample in a vessel solvent, ultimately consuming the water in the sample.

The titrant contains all the components required for the KF reaction: iodine, base, sulfur dioxide, and a solvent medium. The vessel solvent is chosen to match the sample dissolution characteristics. By measuring the volume of the titrant added, the amount of water in the sample can be calculated. The Watermark product line includes reagents with titer values of 5 mg/mL, 2 mg/mL, and 1 mg/mL, covering an array of applications.

With a methanol-free and pyridine-free formula, Watermark volumetric titrants are suitable for all KF titration samples, even those with aldehydes or ketones.

Not sure which to choose?

Choose a
One-Component System if your lab is on a budget, or performs frequent KF titrations. All reactants are in the titrant bottle, and our Watermark non-hygroscopic titrants are designed to be exceptionally stable with a guaranteed shelf life of two years.

Choose a
Two-Component System if you need a higher degree of accuracy, faster titrations, or need to standardize less frequently. The lowest strength available is 0.5 mg/mL and is designed for applications with minimal sample, or very low water content.

Coulometric titration is typically selected with a water content of less than 1%, although samples with water content up to 5% are possible. Anolyte and catholyte choices are based on the sample matrix, which in turn influences generator choice.

Watermark reagents offer the best value and performance for Karl Fischer titration in the industry. With extended shelf life, rapid moisture determinations, and a stable end-point, it is evident that Watermark outperforms the competition. Watermark, by GFS Chemicals, is specially formulated to provide the ultimate in analytical performance.


Standardization of a Karl Fischer titrant is necessary to determine its water equivalency. GFS Chemicals manufactures a broad range of reference materials, including primary standards in our Columbus, Ohio facilities.

Water standards are delivered in boxes of 10 single-use ampoules, and come with a 5-year shelf life. Watermark water standards are methanol-free and can be used for all applications. All standards come with a Certificate of Analysis (COfA), are scrupulously tested in our ISO/IEC 17025 accredited management system, and are NIST traceable.

Solid standards, including sodium tartrate and potassium citrate, are also available.

The Karl Fischer reaction is pH dependent. Most of the Watermarks titrants and solvents are buffered to counter samples that cause small pH changes. If the sample causes the pH to change outside the required 5 to 7.5 range, side reactions and slow kinetics are likely to occur.

To counter the effects of samples with extremely high or low pH values, add a buffering material to adjust the pH back to the optimal pH range.

GFS Chemicals specializes in the manufacture of anhydrous magnesium perchlorate which is an excellent drying agent for air and gases. KF titration systems require protection from atmospheric moisture. We offer many options including molecular sieves, indicating silica beads, drierite and calcium-based desiccants.

Compare our prices and see if we can save you money over your current supplier.

BrandItem #DescriptionGFS ItemLink
Quveon81014Water Standard 1.0 in MeOH9425 
AquamicronGMW20Standard Water/Methanol9425 
AquamicronAWS02VWater Standard 0.25692 
Hydranal20618Working Medium K5322
AqualineAL2300Matrix K5322
Hydra-Point6275-68KF Solvent Methanol Free5322
AquamicronKTXSolvent KTX5322
Quveon43503Solvent KT5322
Hydranal34868Coulomat Oil5202
Quveon17145Coulometric AGR-OIL5202
Hydranal34741Methanol, Dry3569
Hydra-Point6290-68Methanol Anhydrous3569
AqualineAL2110Solvent CM2991
Hydranal37855Solvent CM2991
Aquastar188016Solvent Oil2991
Quveon26541Solvent CX2991
Hydranal37856LipoSolver MH2978
Aquastar188016Solvent for Oils and Fats2978
AquamicronOLXSolvent OLX2978
Quveon26541Solvent CX2978
Hydranal34697Solver (Crude Oil)2978
Aquastar188020CombiSolvent Oils2978
AquamicronOL2Solvent OLII2978
Hydranal34963Potassium Citrate Standard2385
AqualineK2760Potassium Citrate Standard2385
AquamicronSWSSolid Water Standard2385
Hydranal34841Coulomat CG-K2321
Aquastar1697C-1Coulomat C2321
Hydra-Point6286-00Karl Fischer Coulometric Generator Solution (Universal Type)2321
AquamicronCXUAquamicron CXU2321
Hydranal34813Water Standard 52304
Hydranal34849Water Standard 102303
Aquastar188052Water Standard 1.0%2303
AquamicronAWS100VWater Standard 102303
Quveon81037Water Standard 10.02303
Hydranal34828Water Standard 1.02302
Aquastar188051Water Standard 0.1%2302
AquamicronAWS10VWater Standard 1.02302
Quveon81024Water Standard 1.02302
Hydranal34847Water Standard 0.12301
Aquastar188050Water Standard 0.01%2301
AquamicronAWS01VWater Standard 0.12301
Quveon81014Water Standard 0.12301
Hydranal34816Composite 5K1893
Aquastar188006CombiTitrant 5K1893
AqualineAL-2720-80Water Standard 101892
Hydra-Point6287-02KF Coulometric Oven Reagent1889
Quveon18411Coulometric AGR-Oven1889
Hydranal37817Methanol Rapid1885
Quveon24275Methanol Sharp1885
AqualineAL1900Complete 11884
Hydranal34827Composite 11884
Aquastar188001CombiTitrant 11884
Quveon23367Composit 1T1884
Hydranal34836Coulomat AG1671
Hydranal34810Coulomat AD1671
Aquastar109255CombiCoulomat Frit1671
Aquastar109257CombiCoulomat Fritless1671
AqualineAL2520500Electrolyte AG1671
Hydra-Point6280-02Karl Fischer Coulometric Vessel Solution (Pyridine-Free)1671
Quveon11008Coulometric AGR1671
AquamicronGMLSolvent ML1621
AquamicronGKS100MTitrant SS1620
Hydranal34820Coulomat AK1619
AquastarAX1697ECoulomat AK1619
Hydra-Point6283-01Coulometric Vessel Solution for Aldehydes and Ketones (Methanol-Free)1619
AqualineAL2710-40Water Standard 11618
Aquastar109259Water Std. 5 mg/mL1617
AquamicronGCHPGCHP Check Solution P1617
AqualineAL2730-500Water Standard 51617
Hydranal34801Titrant 51616
Aquastar188010Titrant 51616
Hydra-Point6274-02KF Titrant 5 mg/mL1616
Quveon22251Titrant 5T1616
AqualineAL22001Titrant 51616
Hydra-Point6282-02Buffer Solution1615
Quveon20756Buffer Acid1615
Hydranal34840Coulomat CG1613
Quveon13060Coulometric CGR1613
AqualineAL2560Electrolyte CG1613
Hydra-Point6281-00Karl Fischer Coulometric Generator Solution (Pyridine-Free)1613
Hydranal34807Coulomat A1612
AquastarAX1697ACoulomat A1612
Hydra-Point6280-02Karl Fischer Coulometric Vessel Solution (Pyridine-Free)1612
Quveon15572Coulometric AGR-C1612
AqualineAL2500Electrolyte A1612
AqualineAL2510Electrolyte AD1612
AquamicronGEXSolvent GEX1610
Aquastar188015CombiMethanol Solvent1610
Hydra-Point6276-68General Purpose Solvent1610
Hydranal34738Keto Solver1609
Aquastar188007CombiSolvent Keto1609
Hydra-Point6275-68KF Solvent Methanol Free1609
Hydranal34817Working Medium K1609
Hydra-Point6275-68KF Solvent Methanol Free1609
Quveon43503Solvent KT1609
Hydranal34843Coulomat AG-H1607
Hydra-Point6284-01Karl Fischer Coulometric Vessel Solution (CFC-Free)1607
AqualineK-2530Electrolyte AG-H1607
Hydranal34811Titrant 21603
Aquastar188011Titrant 21603
Quveon25299Titrant 2T1603
Hydra-Point6273-02KF Titrant 2 mg/mL1603
Hydranal34806Composite 21601
AqualineAL1950Complete 21601
Aquastar188002CombiTitrant 21601
Hydra-Point6272-68KF Reagent 2 mg/mL1601
AquamicronSSZ30LTitrant SS-Z 3 mg/ml1601
Quveon23336Composit 2T1601
Hydranal34805Composite 51600
Aquastar188005CombiTitrant 51600
AqualineAL2200Complete 51600
Hydra-Point6271-68KF Reagent 5 mg/ml1600
AquamicronSSZ50LTitrant SS-Z 5mg/ml1600
Quveon23268Composit 5T1600
Hydranal34788Humidity Absorber963
AquastarMX1583DMolecular sieve 3A963
Hydranal34803Sodium Tartrate Dihydrate805
Aquastar106664Sodium Tartrate Dihydrate 15.66%805
AqualineK2770Sodium Tartrate Dihydrate805
Hydranal32035Benzoic Acid673
AquastarBX0360Benzoic Acid673
AqualineAC423475000Benzoic Acid673
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