Karl Fischer Reagents


GFS Chemicals manufactures the Watermark® Karl Fischer line - one of the largest selections of Karl Fischer reagents on the market and has the internal technical expertise to meet your needs. From volumetric and coulometric Karl Fischer reagents to certified water standards, GFS Watermark® Karl Fischer Reagents are in stock and available to ship. GFS offers both pyridine and pyridine-free solutions. Our Watermark® Karl Fischer coulometric reagents have a water capacity, in excess of 1000 mg of water/100 ml charge.

Watermark Karl Fischer Reagents & Standards

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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 KF 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.


Standardization of a KF 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 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, are tested under an ISO/IEC 17025 accredidated management system and are NIST traceable
  • Solid standards, including sodium tartrate and potassium citrate, are available.

Watermark® One-Component Titrants & Solvents 

  • With a methanol-free, pyridine-free formulation, Watermark® volumetric titrants are suitable for all samples that can be analyzed via KF titration, even those containing aldehydes or ketones. Choose a one component titrant if your lab is on a budget, or your lab performs frequent KF titrations.

Watermark® Two-Component Titrants & Solvents

Choose a two-component system if you want faster titrations, need a higher degree of accuracy, or want to standardize less frequently. Wondering how two component and one component titrants differ? The reactants are SEPARATED between the titrant and solvent. In a one component product, all reactants are in the titrant bottle. Watermark® non-hygroscopic titrants are designed to be exceptionally stable with a guaranteed minimum shelf life of 2 years. The two-component line also offers a titrant with the lowest titer strength available: 0.5 mg/mL. Designed for applications with minimal available sample, samples with very low water contents.


Coulometric titration is typically selected for samples with a water content of less than 1%, although samples with water contents 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 on the market today. With extended shelf life, rapid moisture determinations, and a stable end point, it’s easy to see why Watermark® outperforms the competition. They are specially formulated to provide the ultimate in analytical performance.


The Karl Fisher reaction is pH dependent. Most of the Watermark® 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 that will adjust the pH back to within 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.

idBrandItem #DescriptionGFS Item
1Hydranal34805Composite 51600
2Aquastar188005CombiTrant 51600
3Hydra-Point6271-68Hydra-Point KF Reagent 5 mg/ml1600
4AquamicronSSZ50LTitrant SS-Z 5mg/ml1600
5Quveon23268Composit 5T1600
6Hydranal34806Composite 21601
7Aquastar188002CombiTitrant 21601
8Hydra-Point6272-68Hydra-Point KF Reagent 2 mg/mL1601
9AquamicronSSZ30LTitrant SS-Z 3 mg/ml1601
10Quveon23336Composit 2T1601
11Aquastar188001CombiTrant 11884
12Quveon23367Composit 1T1884
13Hydranal34816Composite 5K1893
14Aquastar188006CombiTitrant 5K1893
15Hydranal37817Methanol Rapid1885
16Quveon24275Methanol Sharp1885
17Hydranal34741Methanol Dry1610
18Aquastar188009Aquastar CombiMethanol1610
19AquamicronGEXSolvent GEX1610
20Hydranal34738Keto Solver1609
21Aquastar188007CombiSolvent Keto1609
22Hydra-Point6275-68Hydra-Point KF Solvent Methanol Free1609
23Hydranal34817Working Medium K5322
24Aquastar188007CombiSolvent Keto5322
25Hydra-Point6275-68Hydra-Point KF Solvent Methanol Free5322
26AquamicronKTXSolvent KTX5322
27Quveon43503Solvent KT5322
28Hydranal37856LipoSolver MH2978
29Aquastar188016Solvent for Oils and Fats2978
30AquamicronOLXSolvent OLX2978
31Hydranal34697Solver (Crude Oil)2978
32Aquastar188020CombiSolvent Oils2978
33AquamicronOL2Solvent OLII2978
34Quveon20763Medium C2978
35Hydranal34741Methanol, Dry3569
37Hydra-Point6290-68Hydra-Point Methanol Anhydrous3569
38Hydranal34801Titrant 51604
39Aquastar188010Titrant 51604
40Hydra-Point6274-02Hydra-Point KF Titrant 5 mg/mL1604
41Quveon22251Titrant 5T1604
42Hydranal34801Titrant 51616
43Aquastar188010Titrant 51616
44Hydranal34811Titrant 21603
45Aquastar188011Titrant 21603
46Hydra-Point6273-02Hydra-Point KF Titrant 2 mg/mL1603
47Quveon25299Titrant 2T1603
48Hydranal37817Methanol Rapid1885
50Aquastar188015Aquastar Solvent1610
51Hydra-Point6276-68Hydra-Point General Purpose Solvent1610
53Hydranal34817Working Medium K1609
54Aquastar188007CombiSolvent Keto1609
55Hydra-Point6275-68KF Solvent Methanol Free1609
56Quveon43503Solvent KT1609
57Hydranal37855Solvent CM2991
58Aquastar188016Solvent Oil2991
59Quveon26541Solvent DX2991
60AquamicronGKS100MTitrant SS1620
61AquamicronGMLSolvent ML1621
63Aquastar188035Aquastar Buffer1615
64Hydra-Point6282-02Hydra-Point Buffer Solution1615
65Quveon20756Buffer Acid1615
68Hydranal32035Benzoic Acid673
69AquastarBX0360Benzoic Acid673
70Aquastar109259Water Std. 5 mg/mL1617
71AquamicronGCHPGCHP Check Solution P1617
72AquamicronAWS10Water Standard 1.01618
73Hydranal34849Water Standard 102303
74Aquastar188052Water Standard 1.0%2303
75AquamicronAWS100Water Standard 102303
76Quveon81037Water Standard 10.02303
77Hydranal34813Water Standard 52304
78Hydranal34828Water Standard 1.02302
79Aquastar188051Water Standard 0.1%2302
80AquamicronAWS10Water Standard 1.02302
81Quveon81024Water Standard 1.02302
82Hydranal34847Water Standard 0.12301
83Aquastar188050Water Standard 0.01%2301
84AquamicronAWS01Water Standard 0.12301
85Quveon81014Water Standard 0.12301
86Hydranal34803Sodium Tartrate Dihydrate805
87Aquastar106664Sodium Tartrate Dihydrate 15.66%805
88AquamicronGMW20Standard Water/Methanol9425
89AquamicronSWSSolid Water Standard2385
90Hydranal34788Humidity Absorber963
91AquastarMX1583DMolecular sieve 3A963
92Hydranal34807Coulomat A1612
93AquastarAX1697ACoulomat A1612
94Aquastar109255CombiCoulomat Frit1612
95Hydra-Point6280-02HYDRA-POINT™ Karl Fischer Coulometric Vessel Solution (Pyridine-Free)1612
96AquamicronXAMAAquamicron AX1612
97AquamicronXAMA01Aquamicron AX011612
98Quveon11008Coulometric AGR1612
99Hydranal34820Coulomat AK1619
100Hydra-Point6283-01HYDRA-POINT™ Karl Fischer Coulometric Vessel Solution for Aldehydes and Ketones (Methanol-Free)1619
101AquamicronAKXAquamicron AKX1619
102Hydranal34843Coulomat AG-H1607
103Aquastar109255CombiCoulomat Frit1607
104Hydra-Point6284-01HYDRA-POINT™ Karl Fischer Coulometric Vessel Solution (CFC-Free)1607
105AquamicronSAMAAquamicron AS1607
106Quveon15572Coulometric AGR-C1607
107Hydranal34868Coulomat Oil5202
108Aquastar109255CombiCoulomat Frit5202
109Quveon17145Coulometric AGR-OIL5202
110Hydranal34840Coulomat CG1613
111Aquastar1697C-1CombiCoulomat AX1613
112Hydra-Point6281-00HYDRA-POINT™ Karl Fischer Coulometric Generator Solution (Pyridine-Free)1613
113AquamicronCXUAquamicron CXU1613
114Hydranal34841Coulomat CG-K2321
115Aquastar1697C-1CombiCoulomat AX2321
116Hydra-Point6286-00HYDRA-POINT™ Karl Fischer Coulometric Generator Solution (Universal Type)2321
117AquamicronCXUAquamicron CXU2321
118Quveon13060Coulometric CGR2321
119Hydranal34836Coulomat AG1671
120Hydranal34810Coulomat AD1671
121Aquastar109257CombiCoulomat Fritless1671
122Hydra-Point6280-02HYDRA-POINT™ Karl Fischer Coulometric Vessel Solution (Pyridine-Free)1671
123Quveon11008Coulometric AGR1671
124Hydranal34807Coulomat A1612
125Hydra-Point6280-02HYDRA-POINT™ Karl Fischer Coulometric Vessel Solution (Pyridine-Free)1612
126AquamicronAXMIAquamicron AXI1612
127AquamicronFLSAquamicron FLS1612
128Quveon15572Coulometric AGR-C1612
130Hydra-Point6287-02Hydra-Point KF Coulometric Oven Reagent1889
131Quveon18411Coulometric AGR-Oven1889
132Quveon31176Composit 5K5322
133Quveon20671Solvent D2978
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