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

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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.

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