高压下CO2异丙醚体系的汽液相平衡

采用带有可视石英玻璃窗的高压汽液相平衡装置，测定了压力0.5～25MPa、温度265.15～333.15K条件下CO₂异丙醚体系的二元汽液相平衡数据，并通过了热力学一致性检验。用Peng-Robinson(PR)状态方程对CO₂-异丙醚体系的汽液相平衡数据进行关联，得到该方程的二元交互作用参数。结果表明，体系的汽液相平衡数据计算值与实验值偏差较小，可采用PR方程对CO₂-异丙醚二组分物系的汽液相平衡数据进行预测。     

水华蓝藻中微囊藻毒素的提取及其光催化降解

微囊藻毒素(MCs)广泛产生于水华蓝藻中.本研究从太湖水华蓝藻中提取出MCs,发现主要成分为MC-RR.经多级分离和半制备色谱提纯制备得到MC-RR纯品.用水热法合成了钨酸铋(Bi2WO6)催化剂,并对其进行了X射线衍射(XRD)、扫描电子显微镜(SEM)、比表面积(SBET)、等电点pH(pHZPC)等表征.利用不同pH条件下制备的Bi2WO6,在近紫外光照射下对MC-RR进行光催化降解,发现在酸性条件下制备的Bi2WO6有较强的降解效果.同时发现,Bi2WO6对MC-RR的降解以空穴直接氧化为主.     

Polymer-mediated mesoscale mineralization

Polymer-controlled mineralization in aqueous solution or in a mixed solvent media, as well as its com- bination with the interface of air-water can lead to the formation of minerals with unique structures and morphologies, which sheds light on the possibility to mimic the detailed structures of the natural min- erals.     

Calcium isotope fractionation and its controlling factors over authigenic carbonates in the cold seeps of the northern South China Sea

In this study, we analyzed stable calcium isotope results of authigenic carbonates from two cold seep areas of the Dongsha area and the Baiyun Sag in the northern South China Sea. The stable isotopes of carbon and oxygen as well as the mineral composition of authigenic carbonates were used to investigate control calcium isotope fractionation. The δ44/40Ca ratios of the southwestern Dongsha area samples ranged from 1.21‰ to 1.52‰ and the ratio of the Baiyun Sag sample was 1.55‰ of the SRM915a isotope standard. X-ray diffraction analysis showed that the carbonate samples consisted of dolomite, calcite and aragonite, with small amounts of high-Mg calcite and siderite. The δ13C values of the carbonates of the southwestern Dongsha area varied between δ49.21‰ and δ16.86‰ of the Vienna PeeDee Belemnite (VPDB) standard and the δ18O values ranged from 2.25‰ to 3.72‰ VPDB. The δ13C value of the Baiyun Sag sample was 2.36‰ VPDB and the δ18O value was 0.44‰ VPDB. The δ13C values of the carbonates of the southwestern Dongsha area revealed there is methane seeping into this area, with a variable contribution of methane-derived carbon. The sampled carbonates covered a range of δ13C values suggesting a dominant methane carbon source for the light samples and mixtures of δ13C values for the heavier samples, with possibly an organic or seawater carbon source. The δ18O values indicated that there is enrichment in 18O, which is related to the larger oxygen isotope fractionation in dolomite compared to calcite. The results of the Baiyun Sag sample exhibited normal seawater carbon and oxygen isotopic values, indicating that this sample is not related to methane seepage but instead to precipitation from seawater. The relatively high δ44/40Ca values indicated either precipitation at comparatively high rates in pore-water regimes with high alkalinity, or precipitation from an evolved heavy fluid with high degrees of Ca consumption (Raleigh type fractionation). The dolomite samples from the Dongsha area revealed a clear correlation between the carbon and calcium isotope composition, indicating a link between the amount and/or rate of carbonate precipitation and methane contribution to the bicarbonate source. The results of the three stable isotope systems, mineralogy and petrography, show that mineral composition, the geochemical environment of authigenic carbonates and carbon source can control the calcium isotope fractionation.     

Estimation of carbon sinks in chemical weathering in a humid subtropical mountainous basin

The fluvial geochemistry of the mainstream and tributaries of the Zengjiang River was investigated,and the mass balance approach and deduction methods were used to estimate the uptake of atmospheric CO2 through rock chemical weathering.The results showed that the chemical runoff mainly consisted of HCO3-,Ca2+,Na+,and dissolved Si,and that silicate mineral weathering was significant,but carbonate mineral weathering was a minor source of dissolved loads in the Zengjiang River basin because of the low amount o...     

Metallogenetic epoch and mechanism of the tungsten ore in Yushan,Beishan orogenic belt,Gansu

Using SHRIMP zircon U-Pb dating methods and cathodoluminescence （CL） technique, we have precisely dated ore samples from tungsten ore deposit, ore-bearing volcanic-sedimentary strata and granite in the Yushan region within the east Tianshan-Beishan W-bearing zone. This study reveals Yushan tungsten ore deposit zone formed in 250 ± 9 Ma, and it is closely associated with the Permian granites and felsic volcanic rocks. This new type of tungsten ore deposit in the east Tianshan-Beishang multiple-metallogenetic province may probably be associated with the regionally right-literal shearing after the main Carboniferous collisional orogeny, and the formation of pull-apart basin and the felsic magmatism.