Deveropment of analysis method to detect polution record of heavy metal in coral at polution site

在多米尼加共和国，我们可以在河口发现并取样一些2000年存活下来的珊瑚，那里的分水岭地区在2000年左右有广泛的铅污染。此外，我们还用常规方法分析了两只人工养殖的珊瑚在铅污染的人工海水中养殖一年后一周的铅含量。三种常规方法对环境中积累的铅有较高的分辨率(10微米)，但不能灵敏地检测环境中积累的铅。为了在大气条件下测定珊瑚中的巴L线，对微型X射线荧光分析仪进行了改进。在样品和探测器之间放置一个特殊的准直器，准直器的内部可以被抽空。该仪器对镁和KA线的灵敏度可达1000以上，可用于光基质中铁的定量分析，分析精度可达几ppm。

In Dominican Republic, we could find and sample some corals survived from 2000 year in the mouth of river in which watershed areas had extensive lead pollution at around 2000. In addition, we analyzed lead concentration for two corals in captivity by the conventional methods, after one year cultivation with lead polluted artificial seawater of one week. It was found that three conventional methods has enough higher resolution (10 micro meter) but doesn't have sensibility to detect lead accumulated in environ.Improvements in micro x-ray fluorescence analyzer were carried out to detect Ba L lines in coral under atmospheric condition. A special collimator was placed between a sample and the detector, and the interior of the collimator could be evacuated. The sensitivity for Mg and Ka line was gained more than 1000, and the present instrument can be applied to perform quantitative analysis of Fe in the light matrix down to several ppm levels.