Dual PIN PLATINUM Karl Fischer Titration Electrode Care & Maintenance Guide

Dual PIN PLATINUM Karl Fischer Titration Electrode Care & Maintenance Guide

Introduction

This guide contains the basic information for proper use of your new Dual Pin Platinum Karl Fischer Titration electrode.

Karl Fischer titration is a widely used analytical method for quantifying water content in a variety of products. The fundamental principle behind it is based on the Bunsen Reaction between iodine and sulfur dioxide in an aqueous medium. Karl Fischer discovered that this reaction could be modified to be used for the determination of water in a non-aqueous system containing an excess of sulfur dioxide. He used a primary alcohol (methanol) as the solvent, and a base (pyridine) as the buffering agent.

What is the Karl Fischer Reaction?

The ALCOHOL reacts with SULFUR DIOXIDE (SO2) and BASE to form an INTERMEDIATE ALKYLSULFITE SALT, which is then oxidized by IODINE to an ALKYLSULFATE SALT. This oxidation reaction consumes water.

Preparation of electrode –

The Double Pin Platinum electrodes are delivered ready to use.

Application –

Water and iodine are consumed in a 1:1 ratio in the above reaction. Once all of the water present is consumed, the presence of excess iodine is detected voltametrically by the Dual Pin Platinum Indicator electrode. That signals the end-point of the titration.

The amount of water present in the sample is calculated based on the concentration of iodine in the Karl Fisher titrating reagent (i.e., titer) and the amount of Karl Fisher Reagent consumed in the titration.

Specifications –

BODY – PTFE
SENSOR – 2 Pin Platinum 0.75mm ø with 1.50mm balled end
TEMPERATURE RANGE – 0 – 600 C
ELECTRODE LENGTH (OVERALL) – 120mm / 96mm
BARREL DIAMETER – 12mm / 8mm
CONNECTOR (OTHERS ON REQUEST) – TNC(BNC) / Lemmo5
pH RANGE – 0 to 14

Cleaning

Dirt and contamination at the Platinum sensor will lead to measurement inaccuracies. They can be removed with the following procedure:

• Deposits and Scale – with diluted mineral acids
• Organic contamination – with the aid of suitable solvents
• Fats, grease and Oil – with acetone followed by Methylated spirits
• Proteins – with hydrochloric pepsin solution
• Persistent films by carefully rubbing down with fine sandpaper or a diamond file.

DO NOT BEND THE PLATINUM PIN!

CHECK COMPATIBILITY OF PTFE PRIOR TO USING

After the procedure the electrode must be rinsed with distilled water & stored dry with PINs covered with a cap to protect from dust and deposits.

Comments ( 31 )

  • Why two pins required for electrode dual platinum electrode in KF titration, single pin not sufficient?

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  • At the beginning and during the titration as long as the iodine generated reacts with the water, there is no free iodine in the titration solution. A voltage of ca. 400 mV to 650 mV is necessary to maintain the set polarization current at the double pin electrode.
    At the end of the titration when all the water in the sample has reacted with the iodine, free iodine is present in the titration solution. This free iodine gives rise to “ionic conduction”. Now a low voltage of 50 mV to 100 mV is required to keep the polarization current constant. This drop in voltage is used to indicate the end of the titration. Ionic conduction means Iodine takes up an electron at the negatively charged platinum pin of the indicator electrode and is thereby reduced to iodide (I-). Iodide ions, which are present in excess in the titration solution, then releases the electron again at the positively charged platinum pin and is again oxidized to iodine. Therefore to determine end point with Ionic conduction we need Two Pins and single pin will not be sufficient

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