Determination of Trace Silicon by Inhibition Discoloring Spectrophotometry
- VernacularTitle:阻抑-褪色光度法测定痕量硅
- Author:
Jiaming LIU
- Publication Type:Journal Article
- From:
Chinese Journal of Analytical Chemistry
2001;29(3):293-295
- CountryChina
- Language:Chinese
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Abstract:
A new spectrophotometric method for the determination of trace amount of silicon was developed. It is based on the fact that Si(Ⅳ) inhibits discoloration of the ion-association complex of cetyltrimethylammonium-curcumin by H2O2 in the NH3-NH4Cl buffer medium. The apparent molar absorption coefficient ε500=5.70×105 L*mol－1*cm－1. The Beer′s law is obeyed in the range of 0.4～3.6 μg/L with a linear regression equation ΔA=2.23×10－4＋0.02017CSi(μg/L),r=0.9999. The determination limit is 2.0×10－8 g/L. The method has been used for the determination of silicon in water and hair samples with satisfactory results.
