Objective
The different toxicity and bioavailability of Cr(III) and Cr(VI) are a public health concern and therefore require strict control. Trivalent chromium is found to be essential for man whereas Cr(VI) is a potent carcinogenic agent for the respiratory tract requiring continuous monitoring of occupational air. Hence monitoring of the separate species in e.g. drinking water, occupational exposure or environmental samples is necessary. Determination of the total Cr content does not provide sufficient information about possible health hazards. The present state of the art of Cr speciation leaves much to be desired and compels to improve quality assessment. In order to meet the requirements of the Directives, the reliability of the methods needs to be improved substantially. Appropriate reference materials certified for Cr(III) and Cr(VI) are necessary to provide both an effective and economical way for the laboratories to check and improve their performance.
The project aimed to evaluate the state-of-the-art of Cr speciation through an interlaboratory study involving around 20 European laboratories and to produce Certified Reference Materials (CRMs) representative of drinking water and welding dust collected on filter monitors.
The interlaboratory study has been successfully conducted in 1994. The certification campaign of CRM 544 (lyophilised solution) and CRM 545 (welding dust loaded on filter) was concluded in 1995 and the reports were approved in 1996. Both materials are available at the IRMM (Reports EUR 17605 EN, 1997, and EUR 18026 EN, 1998).
The programme involved the following steps: (1) interlaboratory study using a limited batch of reference materials, (2) preparation of a large batch of lyophilised solutions containing Cr(III) and Cr(VI) and of filters loaded with welding dust, (3) certification analyses by the participating laboratories, and (4) technical and statistical evaluation of the resulyts.
Fields of science (EuroSciVoc)
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
CORDIS classifies projects with EuroSciVoc, a multilingual taxonomy of fields of science, through a semi-automatic process based on NLP techniques. See: The European Science Vocabulary.
- medical and health sciences health sciences public health
- engineering and technology environmental engineering water treatment processes drinking water treatment processes
- natural sciences chemical sciences inorganic chemistry transition metals
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Coordinator
9000 Gent
Belgium
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