Do you know the permissible limits of heavy metals in edible birdnest?
To answer the question, fisrt must ask where are these heavy metals from?
Heavy metals exist in uncontrolled environment. If you were to spray insecticide in your farms, you will probably contaminated the nests with mercury and lead as pesticide contained these chemicals. If the nests do not clean thoroughly, small amount of arsenic with be detected due to arsenic present in the feather.
The permissible limits of ;mercury 0.5ppm, arsenic 5ppm, copper 150ppm, and lead 20ppm
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