锶,硼和氟联合作用的亚急性毒理实验及环境意义

本文以自由饮水给药方式进行了锶、硼和氟联合作用的亚急性实验，以探讨锶、硼对氟的拮抗作用。实验结果，给予小鼠200×l0^-6 F 六个月后，可使其骨氟含量显著升高(P<0.01)，肾碱性磷酸酶活力(ALP)显著增高(P<0.01)，4、5个月后血清碱性磷酸酶(ALP)活力亦显著增高(P<0.O1)，同时给予80×l0^-1 B3+、100×l0^-6Sr2+ 时，可以显著降低骨氟含量，抑制血清、肾碱性磷酸酶的活力，表明锶与硼对氟存在拮抗作用。     

Sources of Inaccuracy in Boron Isotope Measurement Using LA-MC-ICP-MS

Laser ablation multi-collector-inductively coupled plasma-mass spectrometry (LA-MC-ICP-MS) has become a valuable tool for the in situ measurement of the boron isotope composition of geological samples at high (tens to hundreds of μm) spatial resolution. That said, this application suffers from significant analytical challenges. We focus in this study on the underlying processes of two of the main causes for inaccuracies using this technique. We provide empirical evidence that not only Ca ions (Sadekov et al. 2019, Standish et al. 2019, Evans et al. 2021) but also Ar ions, that are reflected within the flight tube of the mass spectrometer, are the source for previously reported issues with spectral baselines. We also address the impact of plasma conditions on the instrumental mass fractionation as a source for matrix- and mass-load-related analytical biases. Comparing experimental data with the results of a dedicated release and diffusion model (RDM) we estimate that a close to complete (~ 97%) release of boron from the sample aerosol is needed to allow for consistently accurate LA boron isotope measurement results without the need for corrections.     

滇黔北坳陷寒武系碳酸盐岩古海洋环境特征及地质意义

为厘定滇黔北坳陷寒武系碳酸盐岩古海洋环境,揭示成岩流体与岩溶作用的潜在联系,并预测有利储层发育层段,基于镇雄羊场碳酸盐岩剖面实测及系统取样基础上,采用微量元素、碳氧锶同位素及铸体薄片等分析手段,地球化学与岩石学方法相结合,探讨碳酸盐岩古海洋环境及地质意义。研究结果表明:滇黔北坳陷寒武系清虚洞组-娄山关组整体为海相环境,古海洋温度处于12.82℃~32.84℃之间,主体为温暖或炎热的亚热带气候。海平面具有主体震荡下降的趋势,存在8期海平面变化旋回,发育对应的岩相组合,其同位素演化曲线可作为地层划分依据。微量元素、同位素地球化学及岩石学特征证实娄山关组岩溶作用相对发育,成岩流体混入强氧化性低温大气水,有利储层纵向上主要分布在海平面下降旋回的高部位。     

唐古拉山冬克玛底冰川雪层中淋溶作用的初步研究

利用唐古拉山冬克玛底冰川雪坑和表层积雪样品的实测资料，初步探讨本区雪层中离子淋溶作用的特征，影响因素及其对冰芯记录的干扰。研究发现淋溶作用能够对数周至数月时间尺度的雪层记录产生“平滑”作用，但不会影响冰芯记录的长期变化趋势。     

湘南稀土矿床的放射性特征及其对开采的影响

湘南主要稀土矿区的岩、矿石和稀土矿物的放射性特征表明，矿区放射性强度的高低与稀土总量无关，而与矿石的铀、钍含量密切相关；主要矿区的放射性对其开发与产品都没有影响，但长期接触对人体有一定危害。因此，开采时必须加强防护，防止放射性的长期照射，并选用无放射性的清洁饮用水，以保护人体健康。     

西藏岗巴晚白垩世锶同位素曲线的地层学意义及问题讨论

地质历史时期古海洋中的锶同位素组成具有全球基本一致的演化规律 ,并主要受全球性海平面变化影响。根据从西藏岗巴宗山上白垩统剖面中 6 3个海相碳酸盐样品获得的锶同位素测试数据建立了锶同位素演化曲线 ,与北美同时代锶同位素曲线进行了对比 ,证明晚白垩世有一次全球性海平面升降事件 ,在宗山剖面宗山组近底部的年龄值为 89.4 Ma,并讨论了西藏岗巴宗山地区晚白垩世地层划分对比中的一些问题。     

A Laboratory and Theoretical Study on the Uptake of SO2 Gas by Large and Small Water Drops Containing Heavy Metal Ions

Laboratory experiments have been carried out to investigate the uptake of sulfur dioxide by water drops containing heavy metal ions where the metal ions serve as catalysts to oxidise the taken up S(IV) into S(VI). During the gas uptake the drops were freely suspended at their terminal velocity in the airstream of the Mainz vertical wind tunnel. Two series of experiments were carried out, one with large millimeter size water drops containing manganese or iron ions, and the other with small water drops containing manganese ions and having radii in hundreds of micron size range. The experimental results were compared against model computations using the Kronig–Brink model and the fully mixed model, modified for the case that heavy metal ions present in the liquid phase act as catalysts for the oxidising process. The results of the model calculations show that there are only small differences between the predicted gas uptake according to the two models. In addition it was found that the experimental obtained results from the uptake of SO₂ by water drops containing heavy metal ions for both, large and small water drops did agree with the model results.     

Real-Time Observation on Water-Soluble Ions of PM_(2.5)in Beijing under the Influences of Different Air Masses in Summer

To further understand the variations of water-soluble ions in PM2.5 in Beijing,the authors observed their concentrations continuously and in high temporal resolution by the system for rapid collection of fine particles and ion chromatography(RCFP-IC) during 12–18 July 2010.These results combined with those of earlier backward trajectory research are used analyzed to determine the causes of concentration changes in water-soluble ions under the influences of two kinds of air masses in summer.The results indicate that concentrations of NO3-,SO42-,and NH4+ were influenced strongly by the continental air mass than by the marine air mass.Cl- and Na+ were not changed significantly.Because the sources of K+,Mg2+,and Ca2+ are mainly concentrated on land,their concentration levels were slightly higher under the control of continental air mass than that of the marine air mass.Variations of NO2- during the observation differed from those of other ions;its concentration was significantly higher under the influence of marine air mass.Moreover,the authors obtain the diurnal variations of eight water-soluble inorganic ions including NH4+,K+,Mg2+,Ca2+,Cl-,NO2-,NO3-,and SO42-.Diurnal variations of NH4+,NO3-,and Cl- showed single peak,which appeared before noon,while SO42- showed two peaks that appeared during rush hours.Those of Mg2+,Ca2+,and K+ showed single peak that appeared in the afternoon.That of NO2- showed with a peak appearing at sunrise and a valley appearing at sunset.     

闪电首次回击过程的光谱特性

用无狭缝摄谱仪，拍摄了4次云对地闪电首次回击过程390一660nm波长范围的光谱，并将原子结构的理论应用于闪电光谱的研究，用多组态Dirac—Fock方法，系统考虑相对论效应、电子关联、弛豫效应等重要贡献，对光谱的精细结构进行了计算，给出了谱线的波长、振子强度以及相应的上能级激发能量。通过与试验观测谱线的比较分析发现，大多数谱线对应的上激发能在23ev左右。首次回击过程中，闪电通道内NII离子的密度最大，并且大多数处于n＝3的激发态。