Karl Fischer & Potentiometric Titration Application Library

Hydrocarbon, Halogenated hydrocarbon | Karl Fischer titrator AQ-300/MOICO-A19

Hiranuma Aquacounter AQ-300 Coulometric Karl Fischer TitratorJun 22, 2023

Water content of hydrocarbon and halogenated hydrocarbon could be determined by Karl Fischer coulometric titrator. In coulometric titration, iodine of Karl Fischer reagent is generated by electrolysis and generated iodine quantitatively reacts with water. Reaction formula is described below.

　H₂O ＋ I₂ ＋ SO₂ ＋ 3RN ＋ CH₃OH → 2RN・HI ＋ RN・HSO₄CH₃

　2RN・HI → I₂ ＋ 2RN ＋ 2H⁺ ＋ 2e⁻

Hydrocarbon and halogenated hydrocarbon do not interfere the Karl Fischer reaction and direct injection method could apply. Anode solution is selected in accordance with sample solubility. General use of anode solution contain methanol as solvent. When the sample like a long chain hydrocarbon have poor solubility in methanol, anode solution containing chloroform or hexanol or toluene is used. When fritless cell is used, cathode solution is not necessary.

Determination of chloride ion in concrete | Autotitrator COM-A19

Cement ConcreteJun 22, 2023

This report introduces an example of the determination of chloride ion in concrete. This measurement method is described in “Potentiometric titration method using chloride ion-selective electrode” of “JIS A 1154 Method of test for chloride ion content in hardened concrete”. Nitric acid is added to adjust the pH to 3 or less, and extract chloride ion with boiling. Cool to room temperature, filtrate to separate undissolved component and collect filtrated solution as sample. Chloride ion is determined by precipitation titration using a silver nitrate standard solution.

Determination of chloride ion in cement | Autotitrator COM-A19

Cement ConcreteJun 22, 2023

This report introduces an example of the determination of chloride ion in cement. This measurement method is described in “Method for measuring chloride” of “Japanese industrial standard JIS R 5202 Method for chemical analysis of cements”. The sample is dissolved in nitric acid, a chloride ion standard solution and a hydrogen peroxide solution are added, and the sample is heat-treated, and then the measurement is performed by precipitation titration using a silver nitrate standard solution. The measurements are made by potentiometric titration using a chloride ion-selective electrode as the electrode for end point detection.

Determination of isocyanate (NCO) content in adhesives | Autotitrator COM-A19

Hiranuma Aquacounter Autotitrator COM-A19Jun 22, 2023

Synthetic adhesives like hydrophilic macromolecule –Isocyanate type wood adhesives are consisted of base compound and cross-linker; the principal components of base compound are macromolecule aqueous solution or aqueous dispersing element, or those combination. The principal components of cross-linker is isocyanate compounds. The measurement procedure of isocyanate (NCO) content described in this report is standardized by JIS K 6806. NCO content is determined by the neutralization titration which excess di-n-butylamine is titrated with hydrochloric acid standard solution after sample and di-n-butylamine are mixed and reacted. A measurement example of potentiometric titration for NCO determination is introduced in this report.

ASTM D5155 : Standard Test Methods for Polyurethane Raw Materials: Determination of the Isocyanate Content of Aromatic Isocyanates

Epoxy equivalent determination of epoxy resins | Autotitrator COM-A19 - JM Science

Epoxy Equivalent Weight (EEW) Determination of Epoxy Resins | COM-A19

Application NotesJun 22, 2023

Learn how automated potentiometric titration accurately determines epoxy equivalent weight (EEW) in epoxy resins for quality control, formulation and curing.

Base number in Lubricant oil (Perchloric acid / Back-titration) | Autotitrator COM-A19 - JM Science

Base Number in Lubricating Oil by Perchloric Acid Back Titration — ASTM D2896

Hiranuma Aquacounter Autotitrator COM-A19Jun 22, 2023

Determine base number (TBN) in lubricating oils using automated perchloric acid back titration with the Hiranuma COM Series following ASTM D2896 principles.

Acid number in Refrigerating machine oil | Autotitrator COM-A19 - JM Science

Acid Number in Refrigeration Oil by Photometric Titration — ASTM D974

Hiranuma Aquacounter Autotitrator COM-A19Jun 22, 2023

Determine acid number in refrigeration oils using automated photometric color-indicator titration with the Hiranuma COM Series following ASTM D974 principles.

Base number in lubricating oil (Perchloric acid method) | Autotitrator COM-A19 - JM Science

Base Number in Lubricating Oil by Perchloric Acid Titration — ASTM D2896

Hiranuma Aquacounter Autotitrator COM-A19Jun 22, 2023

Determine base number (TBN) in lubricating oils by automated potentiometric perchloric acid titration using the Hiranuma COM Series, following ASTM D2896 principles.

Base number in lubricating oil (Hydrochloric acid method) | Autotitrator COM-A19 - JM Science

Base Number in Lubricating Oil by Hydrochloric Acid Titration — ASTM D4739

Hiranuma Aquacounter Autotitrator COM-A19Jun 22, 2023

Determine base number (TBN) in lubricating oils by automated potentiometric hydrochloric acid titration using the Hiranuma COM Series and ASTM D4739.

Acid Number in Lubricating Oil by Potentiometric Titration — ASTM D664

Hiranuma Aquacounter Autotitrator COM-A19Jun 22, 2023

Determine acid number (TAN) in lubricating oils using automated potentiometric titration with the Hiranuma COM Series following ASTM D664 principles.

Determination of Hydrogen Peroxide and Peracetic Acid in Food & Beverage Sanitizing Solutions Using Automated Potentiometric Titration

Application NotesJun 22, 2023

Learn how automated potentiometric titration accurately determines hydrogen peroxide and peracetic acid in CIP sanitizing solutions used throughout the food and beverage industry.

Fractional determination of ascorbic acid and sodium ascorbate | Autotitrator COM-A19 - JM Science

Fractional Determination of Ascorbic Acid and Sodium Ascorbate by Potentiometric Titration

Hiranuma Aquacounter Autotitrator COM-A19Jun 22, 2023

Automated potentiometric titration provides a rapid and reproducible method for the sequential determination of ascorbic acid and sodium ascorbate in pharmaceutical and nutraceutical formulations.

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