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'Numerous studies have been published over the past decade documenting arsenic content in rice grown from around the world. Dr. Andrew Meharg, a professor of biogeochemistry at the University of Aberdeen, has led or been part of the research teams in many of these studies.
In 2007, Dr. Meharg led a study that measured arsenic levels among rice grown throughout the U.S. He and his team analyzed 107 samples of rice grown in Louisiana, Mississippi, Texas, Missouri, and Florida, and 27 samples of rice grown in California.
Meharg and his team found that the 107 southern US and central US rice samples averaged .30 micrograms per gram of arsenic (equivalent to 4.4 micrograms per serving), and the California rice samples averaged 0.17 micrograms/gram (ppm) (about 2.5 mcg per serving).'
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