GREEN TREE SCIENTIFIC & INSTRUMENT CO.

KEM Product

Karl Fischer Moisture Titrator

Volumetric method

ASTM E203 Standard Test Method for Water Using Volumetric Karl Fischer Titration

The sample, containing a maximum of 100 mg of water, is dissolved or dispersed in a suitable liquid and titrated with KF reagent, which consists of iodine, sulfur dioxide, organic base, and a solvent (typically an alcohol, such as methanol, ethylene glycol, or 2-methoxyethanol). The titration end point is determined amperometrically with a platinum electrode which senses a sharp change in cell resistance when the iodine is reduced by sulfur dioxide in the presence of water.

ISO 760 Determination of water -- Karl Fischer method (General method)


MKV-710B	MKV-710S	MKV-710M

Measuring method : Volumetric method

Measuring range : 0.1mg ~ 500mgH2O，10 ppm ~ 100% H2O

Burette volume: 10mL

Discharge precision: ± 0.015mL

Coulometric method

ASTM E1064 Standard Test Method for Water in Organic by Coulometric Karl Fischer Titration

This test method is based on the Karl Fischer reaction for determining water-the reduction of iodine by sulfur dioxide in the presence of water to form sulfur trioxide and hydriodic acid. The reaction becomes quantitative only when pyridine or other organic base and methanol or other alcohol are present. Unlike the volumetric Karl Fischer reagents that include iodine, the coulometric technique electrolytically generates iodine, with 10.71 C of generating current corresponding to 1 mg of water in accordance with Faraday’s law.


MKC-710B	MKC-710S	MKC-710M

Measuring method : Coulometric method

Measuring range : 10µg ~ 300mg

Sensitivity : 0.1µg

Precision : RSD < 0.3%(n=10)

Evaporator

ASTM D6869 Standard Test Method for Coulometric and Volumetric Determination of Moisture in Plastics Using the Karl Fischer Reaction (the Reaction of Iodine with Water)

Samples are heated to vaporize water that is transported by a nitrogen carrier gas to the titration cell. The moisture collected in the solution within the titration cell is determined using the reaction of water with I₂.

Endpoint detection is made by instrumented methods. Determination of the moisture present is made using the reaction of I₂ with water.

Coulometric instruments use Faraday’s law to measure the moisture present with 10.71 Coulombs (C) of generating current corresponding to 1 mg of water (2I^- ® I₂+ 2e^-). Volumetric instruments measure the volume of solution containing I₂ that is required to keep the current constant.

ISO 15512 Plastics -- Determination of water content


ADP-611	CHK-501
Evaporator	Multiple Sample Changer

Options

ADP-344	ADP-513
Heat Extractor for Sugar Samples	Evaporator for Oil Samples


ADP-512	ADP-512S
Evaporator for Ores	Evaporator for Ores

Software


KF-Win/ER	Tview6	SOFT-CAP
Software for Titrators	Analysis Software for Titration Results	Data Capture Software