SPECIFIC SILICON ASSAY TEST PROCEDURE
[Special note: As this is a trace elemental analysis technique, care must be taken during
sample preparation to avoid inadvertent contamination of the samples and reagents.
Latex gloves should be worn if the analyst has used silicone-containing cosmetics, to
avoid sample contamination.]
Sample preparation procedure. Using solvent-cleaned scissors, about 50-75 hair fibers
were cut from each previously treated, dried hair tress to be evaluated. The fibers from
the tress were cut just below the (carnauba-waxed) bound end of the tress, clipping off
and discarding the upper 2.5 cm of these hairs (root end). The remaining fibers were
cut into approximately 0.3-cm length clippings with the clean scissors.
Individual samples were prepared by weighing 0.10 _+ 0.02 g of the clipped hair into a
tared vial, using solvent-cleaned tweezers. The hair sample weight was recorded to use
for calculating mg/kg Si from the reported AAS results. Samples were then diluted with
10.0 _+ 0.10 g of enzyme solution, as prepared in the formula below:
Papain enzyme 0.13 -+ 0.02 g
Sodium sulfite 2.00 _+ 0.10 g
Distilled water 100.00 _+ 0.10 g
SPECIFIC SILICON ASSAY TEST PROCEDURE
[Special note: As this is a trace elemental analysis technique, care must be taken during
sample preparation to avoid inadvertent contamination of the samples and reagents.
Latex gloves should be worn if the analyst has used silicone-containing cosmetics, to
avoid sample contamination.]
Sample preparation procedure. Using solvent-cleaned scissors, about 50-75 hair fibers
were cut from each previously treated, dried hair tress to be evaluated. The fibers from
the tress were cut just below the (carnauba-waxed) bound end of the tress, clipping off
and discarding the upper 2.5 cm of these hairs (root end). The remaining fibers were
cut into approximately 0.3-cm length clippings with the clean scissors.
Individual samples were prepared by weighing 0.10 _+ 0.02 g of the clipped hair into a
tared vial, using solvent-cleaned tweezers. The hair sample weight was recorded to use
for calculating mg/kg Si from the reported AAS results. Samples were then diluted with
10.0 _+ 0.10 g of enzyme solution, as prepared in the formula below:
Papain enzyme 0.13 -+ 0.02 g
Sodium sulfite 2.00 _+ 0.10 g
Distilled water 100.00 _+ 0.10 g
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