The standard for the allowable concentration of cadmium in tap water has been revised downward from 0.01 mg/L or less to 0.003 mg/L or less according to Japan's 'Ministerial Ordinance for Partial Revision of the Ordinance Concerning the Water Quality Standard' (The Ministry of Health, Labour and Welfare Ordinance No.18) (February 17, 2010). The revised standard has been in effect since April 1, 2010. Of the original analysis methods specified, the flame atomic absorption spectrometry has been removed, with the following 3 methods remaining and specified for use.
1. Flameless atomic absorption spectrometry
2. ICP emission spectrometry
3. ICP mass spectrometry
Here we introduce an example of flameless atomic absorption analysis of tap water spiked with cadmium at 1/10 the concentration specified in the revised ordinance, using the certified river water reference material JAC 0302 (spiked) provided by The Japan Society for Analytical Chemistry. In addition, the convenient automatic dilution and re-analysis function is introduced.