天然水与人类生活有着密切的关系,寻求简便的预浓集方法和发展一种多元素同时分析技术是十分必要的。我们在实验过程中摸索并发展了醋酸纤维超滤膜预浓集方法,利用带有Si(Li)探测器的能量色散x射线技术可成功地测出天然水中ppb级多种痕量元素。一、制样技术原理:在一定的条件下使天然水中的痕量金属和DDTC(铜试剂)形成螯合大分子,然后用醋酸纤维超滤膜加压过滤, Natural water has a close relationship with human life. It is necessary to find a simple preconcentration method and to develop a multi-element simultaneous analysis technique. In the course of experiment, we explored and developed the pre-concentration method of cellulose acetate ultrafiltration membrane. The energy dispersive x-ray with Si (Li) detector can successfully detect ppb trace elements in natural water. First, the sample preparation technique principle: Under certain conditions, trace metals in natural water and DDTC (copper reagent) to form chelating macromolecules, and then filtered with a cellulose acetate ultrafiltration membrane,