[R.B.]

Some thing I have been looking in from a wider context - and it gets more complicated - some fertilisers may contain other potential damaging substances, such as radio active polonium, and the iodine blocking perchlorate.

Interestingly cadmium has been seen in breast milk as has perchlorate and polonium




http://www.acsa.net/HealthAlert/RadioFood.html

http://pubs.acs.org/doi/abs/10.1021/es990577k