NY 525-2012(沸水浴法)是测定有机肥料有机质现行有效的检测标准,该标准由于耗试剂、耗时长,效率低,无法满足批量检测需求。为了提高检测效率,采用微敞开-石墨消解加热方式,建立适用于大批量有机肥料中有机质的快速测定方法,并与NY 525-...NY 525-2012(沸水浴法)是测定有机肥料有机质现行有效的检测标准,该标准由于耗试剂、耗时长,效率低,无法满足批量检测需求。为了提高检测效率,采用微敞开-石墨消解加热方式,建立适用于大批量有机肥料中有机质的快速测定方法,并与NY 525-2012进行比对。研究表明,微敞开-石墨消解法具有精密度高、操作简便快速、节省试剂、温度均匀等优势,测定结果与沸水浴法比较无显著差异。批量样品测定的结果表明,该方法能将现行标准方法的工作效率提升100%以上。展开更多
Nano-sized trinitrotoluene(TNT) material restrained in silica gel has been prepared by using the sol-gel process to study the effect of varying porosity in gel on the sensitivity of TNT. The TNT content in the gel has...Nano-sized trinitrotoluene(TNT) material restrained in silica gel has been prepared by using the sol-gel process to study the effect of varying porosity in gel on the sensitivity of TNT. The TNT content in the gel has been varied from 60 to 90 wt %(at fixed acetone/tetramethoxysilane ratio of 50). Also, for a fixed TNT content of 75 wt %, the pore structure in the gel has been varied by changing the ratio of silica gel precursor to the solvent. The resultant TNT–silica gel composites have been characterized using scanning electron microscopy, thermal analysis, small angle X-ray scattering and surface area analysis techniques. Impact sensitivity studies were carried out using Fall Hammer Impact Test. The results showed that the sensitivity of nanostructured explosives prepared by sol-gel process can be tailored precisely by controlling the process parameters.展开更多
文摘Nano-sized trinitrotoluene(TNT) material restrained in silica gel has been prepared by using the sol-gel process to study the effect of varying porosity in gel on the sensitivity of TNT. The TNT content in the gel has been varied from 60 to 90 wt %(at fixed acetone/tetramethoxysilane ratio of 50). Also, for a fixed TNT content of 75 wt %, the pore structure in the gel has been varied by changing the ratio of silica gel precursor to the solvent. The resultant TNT–silica gel composites have been characterized using scanning electron microscopy, thermal analysis, small angle X-ray scattering and surface area analysis techniques. Impact sensitivity studies were carried out using Fall Hammer Impact Test. The results showed that the sensitivity of nanostructured explosives prepared by sol-gel process can be tailored precisely by controlling the process parameters.
