I have to compare my research result with WHO standards of Heavy Metal. Help me to find out recent permissible level of heavy metal in plants.
Maybe this link will be useful for you:
https://www.fao.org/fao-who-codexalimentarius/sh-proxy/en/?lnk=1&url=https%253A%252F%252Fworkspace.fao.org%252Fsites%252Fcodex%252FMeetings%252FCX-735-14%252FINFO-DOC%252FCF14_INF01x.pdf
The WHO gives heavy metal guidelines in the food, rather than plants...the limit values always connected with soil, water, sediment, air and the food.
Do you have the list of heavy metals?
https://www.fao.org/fao-who-codexalimentarius/thematic-areas/contaminants/en/
This link and the attached documents are about fao/who guidelines of metals and other contaminants in foods
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