The Application Of HR-ICP-MS To The Measurement Technology Of Active State Element

Measurement technology of element active state, as a new type of geochemical method, which can effectively search for concealed ore body, circle around the known large deposits huge exception of active state and provide strategic target for unknown area. At present, the measurement technique of element active state analysis method can simultaneously determine the element is too little, atomic absorption spectrometry can only determine one element, inductively coupled plasma mass spectrometry method for simultaneous can mostly determine five elements in one time, and their detection limit is higher, thus greatly restricted the application of measurement technology on element active state.ELEMENT XR high-resolution plasma mass spectrometry (HR-ICP-MS) can determine more elements at the same time and which has a strong advantages of the dynamic linear range, this thesis first introduces the HR-ICP-MS water soluble state, clay adsorption state, the organic combination of iron and manganese oxide combining state four elements activity state analysis, the simultaneous determination of elements expand to more than50kinds, greatly improving the efficiency, and the results of detection limit is better than the observed earth chemistry method detection limit. Therefore, the research of this paper can provide measurement of element active states with a strong technical support and promote the further development of the element active state research.The main content of this paper is as follows:1. Using the response surface method, the conditions for HR-the main instrument icp-ms auxiliary gas flow rate, sample gas flow and sampling depth is optimized, the optimized result is:the auxiliary gas flow rate of0.56L/min, atomizing gas flow rate of0.95L/min, the sampling depth to2.3mm. Based on the condition which was optimized with instrument, a set of precise temperature control of semiconductor cooling system was added to HR-icp-ms fog chamber, and electrical double oxide ions production rate are significantly lower than normal fog chamber.2. The extraction conditions of the water extraction phase, clay adsorbed phase, the organic combine phase and Fe-Mn oxides phase in combination about four elements activity states was systemic investigated, extracting time, liquid-solid ratio, the centrifugal rotational speed, extraction temperature and solid-liquid separation methods was respectively researched and the best condition was confirmed. The best extraction conditions of element active state: extraction time for24h, liquid solid ratio of15:1, extraction temperature of35℃, solid-liquid separation methods using centrifugal separation, centrifugal speed in addition to water extraction phase is10000RPM, but the centrifugal speed of clay adsorbed phase, the organic combine phase and Fe-Mn oxides phase is4000RPM.3. Based on optimization of water extraction phase, clay adsorbed phase, the organic combine phase and Fe-Mn oxides phase extraction conditions, we established the HR-ICP-MS analysis method of element active state and expanded the determination of active state elements to more than50kinds of elements, respectively got the element active state detection limit.4. HR-ICP-MS for water extraction phase, clay adsorption state, clay adsorbed phase, the organic combine phase and Fe-Mn oxides phase in combination with the determination of the elements in the states are:precision3.4%～38.1%,3.78%～35.7%,2.41%～35.9%, and2.26%～32.5%; Meet the requirements of the current analysis on element active state.