I was unfamiliar with this as well, but found these sources: https://www.sciencedirect.com/science/article/pii/S187853521400032X https://www.sciencedirect.com/

I was unfamiliar with this as well, but found these sources: https://www.sciencedirect.com/science/article/pii/S187853521400032X https://www.sciencedirect.com/science/article/pii/S187853521... (ctrl-f American) https://www.consumerreports.org/cro/magazine/2015/01/how-much-arsenic-is-in-your-rice/index.htm https://www.consumerreports.org/cro/magazine/2015/01/how-muc...