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Species analysis with the LC-ICPMS

Detecting Toxins: Arsenic in Your Rice?

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Measurement results: Arsenic species in rice

As can be seen, arsenic (III) is predominant in both types of rice. Also arsenic contamination is significantly higher in brown rice. The results show good correlation between the measurement results and the reference values for the certified materials.

The total amount of inorganic arsenic and the concentration of dimethylarsenic acid (DMAA) detected in the rice coincides with the reference values. The results also show good reproducibility with an RSD (relative standard deviation) of 1.1 to 2.6%. Figure 3 shows the chromatograms.

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Positively identifying heavy metals

Highly sensitive and accurate species analysis can be performed with a combined LC-ICPMS system. It is a highly effective method in particular for positively identifying the state of heavy metals, both qualitatively and quantitatively. First, LC is used to separate out the constituents of the sample. The heavy metal content is detected with the ICPMS.

Literature:

[1] Europäische Union, Verordnung (EG) Nr. 1881/2006 vom 19. Dezember 2006 zur Festsetzung der Höchstgehalte für bestimmte Kontaminanten in Lebensmitteln (2006).

[2] Europäische Union, Verordnung (EU) 2015/1006 vom 25. Juni 2015 zur Änderung der Verordnung (EG) Nr. 1881/2006 hinsichtlich der Höchstgehalte für anorganisches Arsen in Lebensmitteln (2015).

[3] Stone, R. (2008). FOOD SAFETY: Arsenic and Paddy Rice: A Neglected Cancer Risk? Science, 321(5886), 184–185. https://doi.org/10.1126/science.321.5886.184

[4] Banerjee, M., Banerjee, N., Bhattacharjee, P., Mondal, D., Lythgoe, P. R., Martínez, M., … Giri, A. K. (2013). High arsenic in rice is associated with elevated genotoxic effects in humans. Scientific Reports, 3(1), 2195. https://doi.org/10.1038/srep02195

* Dr. K. Kartaschew: Shimadzu Deutschland GmbH, 47269 Duisburg/Germany

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