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刑侦新技术:只要化验指纹 就知你碰过什么  发帖心情 Post By:2008/8/12 15:51:38

   据美国媒体8月8日报道,科学家发现通过质谱仪分析指纹,能够知晓这个人触摸过哪些物质,这项新的分析技术能够在刑侦犯罪等领域发挥突出作用。  

   美国普渡大学的化学教授格兰姆·库克斯和他的同事将这项新的研究成果发表在8日当天出版的《科学》杂志上,并详细介绍了实验方法。科学家先将一小滴被电击过的液体滴在收集来的指纹上,液体可以是水或酒精,而电击的目的是为了让液体中充满电荷。电击液体可以分解指纹表面的混合物,溶有混合物的液体随后再被滴入分析仪器中。仪器会将液体蒸发殆尽,并将含有混合物的电荷转化为指纹分子。最后也是最关键的一步,便是用质谱仪甄别出指纹分子到底属于何种物质。像这样的实验过程不断重复进行,分析化验一整枚指纹所包含的混合物,最终结果会输入电脑,绘制成一份二维图像。科学家可以由此确定参与实验者究竟碰过哪些物质。 (中国日报) 

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