MIHAELA - FLORY MARIA, ANA - MARIA HOSSU, AUREL IOVI,  PETRU NEGREA, ALEXANDRU STOICA<br>Determination of Total Chromium in Workplace Atmospheres

MIHAELA - FLORY MARIA, ANA - MARIA HOSSU, AUREL IOVI, PETRU NEGREA, ALEXANDRU STOICA
Determination of Total Chromium in Workplace Atmospheres

Abstract:

The determination of chromium in most samples is extremely difficult because of very low levels present. The only widely available analytical method with sufficient sensitivity is graphite furnace atomic absorption spectrometry (GFAAS), yet values reported in the early literature were divergent. This paper describes a new analytical method to estimate occupational exposure levels of total chromium in workplace atmospheres by atomic absorption spectrometry with a background correction using a cellulosic membrane for sample and solubilization through wet mineralization with nitric acid. The atomisation temperature used was 2500oC and a cleaning step for graphite furnace after each samples serie was realized. The validation of GFAAS method was made in concordance with International Conference on Harmonization (ICH). Standard calibration solutions were used for the range 10 - 100mg/L and they were used in calculating the performance parameters for this method. The performance characteristics established during the “in-house” validation of the method indicate that it gives good information about mobility of total chromium in workplace atmospheres and it was validated. Determinations were undertaken over a three-year period in different points of a chroming room and led to different results for the total chromium concentration, ranging between 0.0018-0.051 mg/m3. Keywords: total chromium, GFAAS, “in-house” validation, workplace atmospheres

Issue: 2010, Volume 61, Issue 9

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