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Analytical Procedures - Chloride Ion (Cl-)
February 24, 2002

Introduction

The analytical method for the measurement of chloride ion (Cl-) in solution is based on titration against AgNO3 using an ion selective electrode for the end point detection.

Equipment

• Cl- ion selective electrode, Orion Cl 9417 B
• Expanded scale pH meter
• 150 ml beaker

Reagents

• Concentrated HNO3
• AgNO3 solution, 1 ml = 1 ml Cl-

Procedure

A 1 ml filtered sample is transferred to a 150 ml beaker.  100 ml of distilled water and 5 ml HNO3 added.  Titrate with AgNO3 solution using ion selective electrode to detect the end point.

Calculation

ml AgNO3 x 1000 / 1000 : ml AgNO3 = g/l Cl-

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