Yes, you are right, it is 189 micrograms, not 189 milligrams. Yet, much higher than lets say, in Indian rice: “The Basmati White rice variety, produced in India, contained low concentrations of As (32 ± 3 μg/kg), whereas the Australian Long White variety contained 189 ± 11 μg As/kg.”
Also: “Past agriculture practices of the extensive use of As-based chemicals as pesticides has led to As contamination of surface and sub-surface soils throughout Australia. The used of As-based chemicals for livestock dip to treat fleas, ticks and lice has also caused widespread As contamination, as the waste from the dips and bathing pens has drained into the soil”.
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