Method Statement Free Sulphur
@(#) Uncontrolled Document freesulphur.html Version 1.1 Last
Revised on 12/09/02
Contents
Introduction
Principle
Performance
Characteristics
Range
of Application
Limit of
Detection
Analytical
Quality Control
References
Introduction
The performance of this method is validated in accordance with
internationally recognised procedures.
The analytical procedure described herein outlines the
determination of free sulphur in soils by solvent extraction and
gravimetric procedures.
Principle
An aliquot of dried and ground soil is extracted with hot toluene.
The extract is reduced in volume to dryness. The residue is then
weighed after attack with concentrated sulphuric acid.
Performance
Characteristics
Substances Determined
Free sulphur.
Range of Application
Limit of Detection
Analytical Quality
Control
Analytical quality control is maintained by a number of measures:
Analysis of control samples within
each analytical batch.
Analysis of reagent/method blanks
within each analytical batch
Ongoing quality assured by the use
of control charts in conjunction with warning and action limits for
the QC sample data
Participation in external
proficiency testing and interlaboratory schemes such as LGC CONTEST,
HSE WASP, CSL FAPAS
References
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