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Sulphuric Acid on the WebTM Technical Manual DKL Engineering, Inc.

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Sulphuric Acid on the Web

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DKL Engineering, Inc.

Handbook of Sulphuric Acid Manufacturing
Order Form
Preface
Contents
Feedback

Sulphuric Acid Decolourization
Order Form
Preface
Table of Contents

Process Engineering Data Sheets - PEDS
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Table of Contents

Introduction

Bibliography of Sulphuric Acid Technology
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Preface
Contents

Sulphuric Acid Plant Specifications
 

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Analytical Procedures - Acid Colour
February 11, 2002

Introduction
Equipment
Reagents
Procedure
Associated Links

Introduction

The measurement of the colour of a liquid sample does not provide any information concerning the nature of the substance producing that colour.  An arbitrary standard scale is used as a means for matching of colour intensity.  A colour of 5 units means that the intensity of the colour of this sample is equal to the intensity of the colour of a sample of sulphuric acid 50% in water, containing 5 milligrams of platinum (as potassium chloroplatinate) per liter.

The true colour of a sample is due only to soluble substances and its accurate determination where suspended matter is present is practically impossible.  Filtration should no tbe used because of the decolourizing action.  The best results can be obtained by centrifuging prior to colour observation.  Photometers are not recommended for the determination of colour, because of interference from turbidity.

Equipment

Reagents

 

Potassium chloro platinate solution.  (Dissolve 1.246 g. of grade reagent and 1.00 g. of cobalt chloride (CoCl2) in water, add 100 ml of HCl and dilute to 1 liter. This solution has the conventional value of 500 units, according to APHA standard - American Public Health Association).

Procedure

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