About what precautions the chemist should take--
It depends on what she is working with and how she is exposed.  She is much
more vulnerable in pregnancy, when her blood levels might match the fetal
levels.  So she should know some things already.
Industrial sites, including research labs, have protective hoods with
separate ventilation for doing work with aromatic organic compounds which
could be absorbed and distributed in the body.  All this is regulated by
occupational health law.

Fat-soluble things are often the baddies, water soluble things tend to go
through the system faster and not accumulate.  But the pH and the
pharmacokinetics of the substances will determine whether they pose a hazard
to the baby, as that will determine how much is likely to end up in her
milk.  She should be able to provide a list of the chemicals she is exposed
to and the nature of the exposure.  There should be info about each agent
which is readily available to her, and through OSHA or the relevant local
authority.

Hope this helps.
Rachel Myr
Norway

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