Table T1. Known
and measured content of quartzsilica mixtures.
Biogenic
silica (wt%)
Known
Measured
49
36
19
17
12
7
6
6
Notes: Known biogenic
silica is represented by chromatography grade silica gel. Measured biogenic
silica was determined by X-ray diffraction (see "X-Ray Diffraction" in
"Methods").
