ISO 20552:2007
Workplace air - Determination of mercury vapour - Method using gold-amalgam collection and analysis by atomic absorption spectrometry or atomic fluorescence spectrometry

Standard No.

ISO 20552:2007

Release Date

2007

Published By

International Organization for Standardization (ISO)

Latest

ISO 20552:2007

Scope

This International Standard specifies a procedure for determination of the mass concentration of mercury vapour in workplace air using a method of gold-amalgam collection with analysis by either cold vapour atomic absorption spectrometry (CVAAS) or cold vapour atomic fluorescence spectrometry (CVAFS). The procedure specifies a number of sampling methods for different applications. a) When it is known that no particulate inorganic mercury compounds are used in the workplace and that none are produced in the processes carried out, samples of mercury vapour are collected using a pumped sorbent tube containing porous gold-coated diatomaceous earth. Suitable sorbent tubes are commercially available or they can be made from sorbent prepared by pyro-decomposition of chloroauric acid [hydrogen tetrachloroaurate(III)] sintered on diatomaceous earth. b) When both mercury vapour and particulate inorganic mercury compounds could be present in the test atmosphere, samples of mercury vapour are collected using a pumped sorbent tube fitted with a quartz fibre prefilter to remove particulate inorganic mercury compounds. If desired, the procedure described in ISO 17733 can be used to collect and analyse separate samples for measurement of particulate inorganic mercury compounds. c) When it is known that no elemental mercury is used in the workplace and that no mercury vapour is produced in the processes carried out, the procedure described in ISO 17733 can be used, if desired, to collect and analyse samples for measurement of particulate inorganic mercury compounds. The procedure is highly sensitive and suitable for static sampling or for determination of short-term personal exposure to mercury vapour in workplace air. The lower limit of the working range of the procedure is governed by the lower limit of the analytical range of the CVAAS or CVAFS instrument, which is approximately of mercury for a sorbent tube containing of sorbent (see 13.1). The upper limit of the working range of the procedure is governed by the upper limit of the analytical range of the CVAAS or CVAFS instrument, e.g. about of mercury (see 13.2). The sampling capacity of one commercially available sorbent tube has been shown to be greater than . The concentration ranges of mercury in air for which the procedure is applicable are determined in part by the sampling method selected by the user. The procedure is suitable for making short-term measurements (e.g. ) when sampling at a flow rate of between and using a commercially available sorbent tube. For assessment of long-term exposure, such as , this procedure can be used with sampling flow rate of in workplaces where the concentration of mercury vapour is expected to be lower than . If the expected concentration of mercury vapour is higher than , it is necessary to use the procedure prescribed in ISO 17733. The method is unsuitable for making measurements of mercury vapour in air when chlorine is present in the atmosphere, e.g. in chloralkali works (see 13.8.1). Gaseous organo-mercury compounds can cause a positive interference (see 13.8.2).

ISO 20552:2007 Referenced Document

• ISO 17733 Workplace air - Determination of mercury and inorganic mercury compounds - Method by cold-vapour atomic absorption spectrometry or atomic fluorescence spectrometry*， 2015-12-01 Update

ISO 20552:2007 history

• 2007 ISO 20552:2007 Workplace air - Determination of mercury vapour - Method using gold-amalgam collection and analysis by atomic absorption spectrometry or atomic fluorescence spectrometry