SKC Limited Chromic Acid Test Kit User Manual
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Chromic Acid Mist Test Kit
Operating Instructions
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Contents
Introduction
Synopsis of the method .............................................................................................................. 2
Getting started ........................................................................................................................... 2
Sampling
Loading the filter paper ............................................................................................................... 4
Calibration .................................................................................................................................. 5
Analysis
The chemicals ............................................................................................................................ 6
The apparatus ............................................................................................................................ 7
The comparator .......................................................................................................................... 8
Removing the filter paper for analysis .......................................................................................... 8
Administration and Next Steps
Record keeping ........................................................................................................................ 10
Results ..................................................................................................................................... 10
Supplies ................................................................................................................................ 11
Safety Data Sheets
Acetone .................................................................................................................................... 12
Alkali treated filter membranes .................................................................................................. 13
Sulphuric acid solution .............................................................................................................. 14
1,5 diphenylcarbazide ............................................................................................................... 15
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Introduction
This kit has been designed to comply with MDHS method 52/3 obtainable from the Health &
Safety Executive for the testing of Chromic Acid Mist.
We strongly recommend reading MDHS 52/3 prior to commencing any sampling.
Synopsis of the method
Using either a ‘seven hole head’ or - more recently - the ‘IOM sampler’ to hold an alkali treated filter
paper, an air sample is taken at 2 litres per minute over the time period of one hour.
This can be positioned over a tank with the optional clamp.
After sampling, the filter paper is removed from the sampling head and using the chemical kit and
comparator, an analysis and quantification can be made of the Chromic Acid Mist levels.
Getting started
Refer to your air sampling pump manual for detailed descriptions on setting the pump sampling
flow rate and time period. Most pumps can be started and stopped manually. The flow rate must
be set using an external calibration device such as a rotameter or other such calibrator. This must
be done with the filter sampling head assembled and inline.
For convenience we recommend an SKC Universal Deluxe air sampling pump which can be set to
automatically stop after one hour.
This manual contains all the information required to process the filter with the chemical kit that you
have purchased.
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Introduction
CAUTION!
Observe precautions when handling treated filters, and chemicals provided, as they may
cause harm to health.
We recommend only using stainless steel forceps/tweezers to handle alkali treated
filters.
Safety Data Sheets are provided at the rear of this manual.
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Sampling
Tips and advice on setting up a sampling train (the sample pump with a filter) can be found in the
SKC Step by Step guide.
The process of loading a filter paper and calibrating this sampling train is similar to the set up
required for inhalable dust sampling using an IOM sampler.
If you do not have this guide, a free copy can be downloaded from the SKC website at -
www.skcltd.com
Loading the filter paper
The IOM comprises a two piece cassette and
the filter is loaded into the cassette which is
then placed inside the sampler.
The front cover of the sampler is then
screwed onto the thread of the body.
Diagram showing the positioning of the filter
paper within an IOM Sampler.
Note that the filter is cream/ white in
colour.
A blue paper if present is a separator
only and is not used in sampling.
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front
cover
filter
cassette
front
body
cassette
grid
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