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The Zheduo Mountain tunnel crosses the Xianshuihe fault zone in Kangding city. The Xianshuihe fault zone is composed of many large-scale faults and features a complex geological structure and strong geothermal activity. Based on geothermal drilling data, hydrogeological tests and the geothermal geological back-ground of the study area obtained via hydrogeological surveys and hydrogeo-chemical methods in the process of tunnel surveying, this paper explores the exposure characteristics and distribution of geothermal water in the study area, analyses its hydrogeochemical and isotopic characteristics, and thoroughly studies the hydrogeological structure of the geothermal water to explore the genetic mechanism responsible for the formation of the geothermal water. The influence of the geothermal water and high ground temperatures on tunnel construction is further predicted, and practical and effective engineering treatment suggestions are proposed.

The determination of lead in import ginseng was studied, where microwave assimilation offers a quick, safe and accurate approach with little pollution compared to conventional methods. In the measurements graphite-furnace atomic absorption spectrometry (GFAAS) was used with the advantages of high sensitivity, high speed and little wastage. The microwave assimilation was programed, the mixed acid was analyzed, the problem of the effect of final assimilating liquid on the inspection results was solved, and the inspection conditions of GFAAS were studied. Based on the many experimental results, the suitable incinerating temperature and atomizing temperature were chosen, and the final graphite-furnace temperature-rising program was determined. This method shows a linear range of 0-100 micrograms.L-1, a determination limit of 2.80 micrograms.L-1, a relative standard deviation of 0.91% and a recovery of 98.13%. The precision and accuracy are satisfying.