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1ppm is greater than 1ppb. Reason: ppm is mg/l and ppb is ug/l. And mg is always greater than ug.

1ng = 1000ug

1ug = 1000mg

1mg= 1000kg....

Hope this information helps.

Regards,

Nazia Farooqui

Heriot Watt University,

Scotland.

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15y ago

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