headerdrawing1.jpg (96365 bytes)

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

Knowledge for the Sulphuric Acid Industry Line.jpg (1139 bytes)

Sulphuric Acid on the Web

Introduction
General
Equipment Suppliers
Contractor

Instrumentation
Industry News
Maintenance
Acid Traders
Organizations
Fabricators
Conferences

Used Plants
Intellectual Propoerty
Acid Plant Database
Market Information
Library

Technical Manual

Introduction
General

Definitions
Instrumentation
Plant Safety
Metallurgial Processes
Metallurgical
Sulphur Burning
Acid Regeneration
Lead Chamber
Technology
Gas Cleaning
Contact
Strong Acid
Acid Storage
Loading/Unloading

Transportation
Sulphur Systems
Liquid SO2
Boiler Feed Water
Steam Systems

Cooling Water
Effluent Treatment
Utilities
Construction
Maintenance
Inspection
Analytical Procedures
Materials of Construction
Corrosion
Properties
Vendor Data

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
Order Form
Table of Contents

Introduction

Bibliography of Sulphuric Acid Technology
Order Form

Preface
Contents

Sulphuric Acid Plant Specifications
 

Google Search new2.gif (111 bytes)

 

log 2.JPG (76785 bytes)

Sharplex.jpg (28953 bytes)

MAHLEInd.jpg (21078 bytes)

 


Analytical Procedures - Mercuric Ion (Hg++)
February 24, 2002

Introduction
Equipment
Reagents
Procedure
Calculation
Associated Links

Introduction

The analytical method for the measurement of mercuric ion (Hg++) concentration in solution is a double titration with magnesium.

An amount of ethylene diamine tetra-acetic acid (EDTA) solution is added to the sample, and the excess is back titrated with magnesium solution.  Iodine ion is then added to form a strong complex with the mercury ions, thereby liberating an equivalent amount of EDTA.  The EDTA is again titrated with magnesium solution.

Equipment

Reagents

 

Procedure

To 25 ml of sample (filtered through a folded filter if necessary) in a 400 ml beaker, add 10 ml EDTA solution and 10 ml buffer solution (pH must be 9.5 to 10).   If there is any free chlorine in the sample boil briefly and add more buffer solution.  Dilute with 150 ml distilled water and add four (4) drops of indicator.   The colour should turn green.  If the colour is red, add more EDTA solution.   Titrate with magnesium solution until the colour changes from green to red.   Fill the burette again with magnesium solution.  Add approximately 3 g potassium iodide to the beaker.  The colour will change to green again.  Stir the sample for 1 minute, then titrate again with magnesium solution until the colour changes from green to red.  The amount of magnesium solution (ml) is used to calculate the Hg++ content.

Calculation

Hg++ (g/l) = (ml) x 0.05 x 200.6 / 25

For solutions of higher concentrations of Hg++ ions, reduce the sample volume accordingly, and adjust the actual sample volume in the calculation.

TopofPage.jpg (2219 bytes)