摘要：Experimental design （DOE） was employed to precisely determine the content of rubidium in chloride type brine of Qionglai （A city in Sichuan province, southwest of China） using atomic absorption spectrometry （AAS） technique. From the statistical analysis of six factors, it was found that K＋ and CI- were the significant interfering elements for the determination of rubidium. A model was established to eliminate the interference effects of K＋ and Cl . The experimental results indicate that, under the optimal conditions, the developed method for the rubidium determination possesses the advantages of low detection limit （0.019 μg·mL^-1 at a significant level of 0.05） and higher recovery （97.2%--103.4%）.

摘要：The performance of magnesium oxychloride cement concrete(MOCC)in road engineering in the arid region in northwest China was investigated over a two-year *** categories of MOCC pavement,light-burnt magnesia concrete road(Road-L)and dolomite concrete road(Road-D),were prepared with light-burnt magnesia and a mixture of light-burnt magnesia and caustic dolomite(1:3 by mass),*** in the properties of the MOCC pavement,such as compressive and flexural strength,mineralogical phase,and microstructure,after being exposed to two rainy seasons in the field were *** compressive strength of the cored samples were conducted after being aged for 28 d,and the compressive and flexural strength were tested at ages of 1,2,3,28,90,180,270,360 and 720 *** mineralogical phase and microstructure of the pavement were also analyzed by X-ray diffraction(XRD)and scanning electron microscopy(SEM).The results demonstrate that MOCC pavement obtained desirable compressive and flexural strengths after curing for 3 d for Road-L and 28 d for *** of the compressive and flexural strength of Road-L and Road-D decreased slightly after experiencing two rainy seasons,with the major hydration products being 5Mg(OH)2 MgCl28H2O(Phase 5)and 3Mg(OH)2 MgCl28H2O(Phase 3).The decomposition of Phase 5 is mainly responsible for reducing the mechanical strength of the MOCC pavement.