Samenvatting

This research is to investigate to what extend the NIOSH-7605 and ISO-16740 methods can be used to determine insoluble hexavalent chromium in air. The methods were tested and optimized on the extraction and sample preparation steps. After optimization the methods were validation on limit of detection (LOD) and quantification (LOQ), accuracy, reproducibility and expanded uncertainty.

NIOSH-7605 was found to have a LOD of 0.02 µg and a working range from 0.05-13.75 µg. ISO-16740 was found to have a LOD of 0.02 µg and a working range of 0.05-10 µg. Both methods were also validated in terms of accuracy, reproducibility and expanded uncertainty on levels of 0.40 µg and 4.00 µg of chromate.

Both NIOSH-7605 and ISO-16740 can be used to determine the amount of insoluble hexavalent chromium in air. It is recommended to use the NIOSH-7605 since the pH of test solution were the same as the mobile phase of the IC. The opposite is true for ISO-16740 which can have some interference with low standards and blanks.