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With hydrazine group benzyldithiocarbazate successfully modified nano-silicon dioxide, the solution for the enrichment and separation of trace heavy metal ions. Experiments show that, pH3, the modified nano-SiO2 to Cu (II) and Ni (II) ions with high selectivity and detection limits are 0.31,0.43μg L-1, RSD is less than 3.0%, for the actual the sample enrichment and separation satisfactory results Cu (II) and Ni (II) ions.

September 20, 2010, China National Accreditation Board for Conformity Assessment (CNAS) Laboratory Technical Committee nano Professional Committee in Beijing held a "specific surface area of standard material surface modification ordered nanoporous silicon dioxide surface area, pore volume and pore size standard substance "scientific and technological achievements appraisal meeting, 13 experts from the China Institute of metrology, Beijing University and China University of petroleum and other units attended the appraisal.

Hydrofluoric acid Dissolving - Determination of silicon dioxide content in phosphate rock potassium fluosilicate volumetric method, hydrofluoric acid decomposition phosphate rock sample, as long as control the temperature and volume of the sample solution, it can be converted to silicon fluoride acid remains in the solution, in a suitable acidic medium with potassium ions generated fluorine potassium silicate precipitate. Silicon potassium fluoride hydrofluoric acid hydrolysis in boiling water with a standard solution of sodium hydroxide and titrated to generate hydrofluoric acid. According to the volume of standard solution of sodium hydroxide consumption can be calculated silica content.



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