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炸药对环境的影响主要来自于军工企业及军事单位的武器生产、贮存及试验过程中的污染.痕量炸药的分析一般采用高效液相色谱法,如美国环保局(EPA)批准的方法(SW846中的方法8330),Waters最近推出的环境样品中炸药的痕量富集及HPLC分析方法,对于现有的方法提出了以下改进.1.固相萃取技术富集样品为了改进现有方法及减少有机溶剂的使用量,EPA正在就使用新的样品处理技术替代传统的液-液萃取进行探讨.固相萃取由于快速、经济、操作简便而倍受青睐.Waters生产的Porapak RDX预处理柱由一种低萃取度树脂制成,专门用于水中芳香硝基化合物及硝氨的富集,这种柱子具有很高的选择性,回收率达到90%以上.Ippb和10ppb样品富集,分析的变异系数分别好于7%和5%.图1为纯水中含lppb各化合物经Porapak RDX柱富集40倍后在waters反相色谱系统上的分离谱图.
The impact of explosives on the environment mainly comes from the production, storage and testing of weapons in military enterprises and military units. The analysis of trace explosives generally uses high-performance liquid chromatography, such as the method approved by the United States Environmental Protection Agency (EPA) (SW846 8330), and Waters recently introduced the method of trace enrichment and HPLC analysis of explosives in environmental samples. The following improvements have been made to the existing methods.1 Solid phase extraction (SPE) enrichment of samples In order to improve the existing methods and to reduce EPA is using traditional sample-processing techniques to replace conventional liquid-liquid extraction, which is favored by its rapid, economical and easy-to-use operation. The Porapak RDX pretreatment column from Waters consists of a Made of low extraction resin, specifically for the enrichment of aromatic nitro compounds and nitric ammonia in water, with a high selectivity and a recovery of more than 90% .Ippb and 10ppb samples are enriched and analyzed for variation The coefficients were better than 7% and 5%, respectively. Figure 1 shows the chromatograms of each compound containing 1 ppb in pure water on a Waters reverse phase chromatographic system after 40-fold enrichment with Porapak RDX column.