For the first time, the daily dietary silicon intake of adults in Belgium h
as been evaluated by duplicate portion sampling, the samples were heated in
a microwave oven and atomic absorption spectrometric determination of the
element was carried out. The mean intake value of adults (18.6+/-8.5 mg/day
) is similar to the few data found in the literature. Since the silicon req
uirement of humans and animals is still unknown, no comparison could be mad
e with recommended daily allowance values.