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  • ISO
    ISO 6767:1990 Ambient air - Determination of the mass concentration of sulfur dioxide - Tetrachloromercurate (TCM)/pararosaniline method
    Edition: 1990
    $192.38
    / user per year

Content Description

This international Standard specifies a spectrophotometric method, known as the tetrachioromercurate (TCM)/pararosaniline method, for the determination of the mass concentration of sulfur dioxide in ambient air within the range of 20 μg/m3 to about 500 μg/m3.

The sampling period is 30 min to 60 min.

if a longer sampling period than 60 min is used, or higher concentrations of sulfur dioxide (up to about 2000 μg/m3) are expected, care is necessary to ensure that the concentrations of sulfur dioxide in the absorption solution given in clause 6, paragraph 2 are not exceeded. This can be achieved by a reduction of the volume flow rate during sampling. Sample solutions obtained by this procedure may be stored for up to 24 h before making measurements, provided that they are kept in a refrigerator at about 5 °C.

Substances which are known to interfere and which might be present in the air being sampled are listed in 7.5

indications of the precision and accuracy of the method, and of the lower detection limit are given in 8.2.

Detection limit, standard deviations and lnterferences qualify the TCM-method for orientating field measurements in the higher concentration range. When more accurafe measurements are necessary, instruments which are specially tested and calibrated should be used.



About ISO

ISO, the International Organization for Standardization, brings global experts together to agree on the best way of doing things – for anything from making a product to managing a process. As one of the oldest non-governmental international organizations, ISO has enabled trade and cooperation between people and companies all over the world since 1946. The International Standards published by ISO serve to make lives easier, safer and better.
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