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在地球化学找矿过程中,砷、锑、铋和汞都是十分重要的指示元素。采用氢化物发生技术并配合无色散原子荧光仪器,有很低的检出限,通常可以达到0.1～0.01ppm。对于接近或低于地质背景的元素均能明显检出,而且线性范围可达到3～4个数量级。故能满足化探扫面的要求。砷、锑、铋和汞4元素的单元素测定已有文报道,本文主要研究用国产双道原子荧光仪器,实现一次取样,砷和锑同测,铋和汞同测。经过对若干化探及地热样品的实测和对8个部颁水系沉积物1级标样的测定,证明本法简便,准确。一方法基本原理与特点本法是利用强还原剂硼氢化钾在酸性溶液中与待测元素生成氢化物(或汞蒸气),用氩气做载气将其载入开口石英炉中加热,在形成的氩- 氢火焰中原子化并被特征光源辐射激发,产生荧光。
In geochemical prospecting, arsenic, antimony, bismuth and mercury are all very important indicator elements. Using hydride generation technology and with non-dispersive atomic fluorescence spectrometer, has a very low detection limit, usually up to 0.1 ~ 0.01ppm. For the elements close to or below the geological background can be clearly detected, and the linear range can reach 3 to 4 orders of magnitude. It can meet the requirements of the geochemical scanning surface. A single element determination of arsenic, antimony, bismuth and mercury 4 elements has been reported, the main research in this paper using domestic dual-channel atomic fluorescence instrument to achieve a sampling, arsenic and antimony with the same test, bismuth and mercury with the same test. After a number of geochemical and geothermal samples of the measured and 8 ministry of water sediment sediment level 1 standard samples to prove that the method is simple and accurate. A method of basic principles and characteristics of this method is the use of strong reducing agent potassium borohydride in acid solution with the element to be measured to generate hydride (or mercury vapor), with argon as a carrier gas to load it into the open quartz furnace heating, at The formed argon-hydrogen flame is atomized and excited by the characteristic light source to generate fluorescence.