- 0.01 mg-As/kg-water : is around the US safe limit
- 0.1 mg-As/kg-dry-rice-grain : is about the best-case scenario
- 1 mg-As/kg-dry-rice-grain : is about the worst-case scenario
- 0.03 mg-As/d/kg-bodyweight : long-term exposure, is where trouble seems to start
So for a 55 kg body, I should aim to ingest no more than 1.65 kg-dry-rice-grain/d ... which seems like a negligible risk. Even that is under the assumption that this was the worst, pre-monsoon-grown, As-rice in the world. Whereas if you go to rice packager websites in Malaysia, you'll see they boast of testing to ensure safe limits.
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