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MAK Commission: Manganese - Determination of manganese and its inorganic compounds in workplace air using atomic absorption spectrometry (AAS)

Air Monitoring Method - Translation of the German version from 2021

The analytical method described here permits the simultaneous determination of manganese dusts and manganese compounds occurring in particulate form in the workplace air in a concentration range of one tenth up to twice the currently valid German Occupational Exposure Limits of 0.2 mg/m³ (inhalable dust fraction) and 0.02 mg/m³ (respirable dust fraction). The peak limits, each with an excursion factor of 8, can also be checked.

Sampling is carried out using a flow-regulated pump to draw a defined volume of air through a quartz fibre filter. The sampling head predetermines whether the inhalable fraction or respirable fraction is collected. Intake cones for 10 l/min as well as for 3.5 l/min can be used. The manganese deposited on the filter in the form of dust and particles is determined by a graphite furnace atomic absorption spectrometer (GF-AAS) after acid digestion using a high-pressure microwave digestion system. Quantitative evaluation is based on an external multiple-point calibration. If matrix influences occur, then the standard addition method is used for quantitative evaluation. The limit of quantification is 13.6 pg absolute and 0.02 μg/m³ for a sampling volume of 1.2 l and a sampling period of 2 h. The mean recovery is 96% and the expanded uncertainty for the validation range of 0.002 to 3.2 mg/m³ is 30% for the inhalable fraction and 27% for the respirable fraction.

Bibliographic information

C. Schuh, M. Kirchner, R. Hebisch, T. H. Brock, A. Hartwig:
MAK Commission: Manganese - Determination of manganese and its inorganic compounds in workplace air using atomic absorption spectrometry (AAS). Air Monitoring Method - Translation of the German version from 2021
in: The MAK Collection for Occupational Health and Safety, Vol 6, No 2 2021. pages 1-12, DOI: 10.34865/am743996e6_2or

download file "MAK Commission: Manganese - Determination of manganese and its inorganic compounds in workplace air using atomic absorption spectrometry (AAS)" (PDF, 434 KB, Not barrier-free file)

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