多金属结核样品中微量碘的测定

试验了艾斯卡试剂半熔温度对离子色谱法测定多金属结核中碘的影响，选定半熔温度为６７０℃可控制锰酸盐的形成以消除其对测碘的干扰。用此法测定多金属结核标样中碘，其结果与信息值符合，９次测定的ＲＳＤ小于２５％，加标回收率在９５５％～９７％。     

海底沉积物孔隙水钡循环对天然气渗漏的指示

冷泉流体的渗漏活动强烈地影响着海底沉积物孔隙水钡循环。冷泉流体中的Ba2+ 向上扩散与孔隙水硫酸盐反应,在硫酸盐—碳氢化合物转化带（SHT）之上沉淀重晶石。随着沉积物的埋藏,先前沉淀的重晶石被埋藏于SHT之下的硫酸盐亏损带,将发生溶解,溶解的钡向上扩散,在SHT之上再次沉淀重晶石。当体系中向上扩散的Ba2+超过埋藏的重晶石中的钡时,在剖面上形成“钡锋”。向上渗漏的碳氢化合物（甲烷为主）通量控制了SHT的深度,二者之间存在很好的地球化学耦合关系,从而,可以用“钡锋”来评价天然气渗漏活动的特征。在总结和分析国际海底冷泉渗漏活动区沉积物孔隙水的甲烷和钡循环的研究进展基础上,综述了海底沉积物孔隙水钡循环对现在和过去天然气渗漏的指示,总结了渗漏成因重晶石的地质和地球化学特征。     

Determination of butyltin in seawater by gas chromatography with flame photometric detector

INTRODUCTIONTheincreasinglydiverseuseofbutyltininindustry ,agricultureandaquaculturehasledtocon cernregardingtheimpactanddangerofthesealkyltincompoundsonenvironment.Muchattentionhasbeenpaidbyworldscientistsinthelastthirtyyearstotheproblemsoforganotincontamination .Theuseoforganotin ,particularlytributyltinbiocides,asshippaintcomponentcausescontaminationofharbourandcoastalaquaticbiota.Tributyltinandbutyltinareveryeffectiveagainstmarinefoulingorganismsbutalsopollutethemarineenvironmentandar…     

Sweden and the Baltic Sea pipeline: Between ecology and economy

Building a submarine pipeline in the Baltic Sea to transport natural gas from Russia to Germany contradicts targets to reduce fossil fuel dependency and seems to ignore a long history of environmental challenges in the area. This article examines the tensions between the environmental, economic, and national security arguments framing the Swedish government decision to allow the pipeline to be laid on the Baltic seabed passing through the Swedish economic zone. At first sight, the decision seems to run contrary to Sweden's ambitious environmental policy. However, by framing the issue within a broader understanding of the country's tradition of consensual decision-making, and considering the tensions and contradictions inherent in policies for sustainable development, the permission fits well with the logic that, in case of conflict, economic growth is given priority even when the environment is at stake.     

离子色谱法测定冰川末端大气PM2.5可溶性离子及其来源解析

为了研究祁连山西段冰川末端地区大气PM_2.5细粒子中可溶性无机离子组分的变化特征,于2011年采集了一批大气PM_2.5的Telfon滤膜样品,并应用离子色谱对可溶性离子进行了分析。样品采用超纯水超声萃取各种水溶性离子,优化的萃取溶液体积为25 mL,萃取时间为30 min,萃取液用0.45μm纤维滤膜过滤,各种离子在一定浓度范围内线性关系良好,相关系数r>0.999。所测样品的阴阳离子中,SO₄^2-、NO₃^-、Ca²⁺、和NH₄⁺的质量浓度约占到水溶性离子总量的88%。可溶性离子浓度呈现出春夏高、秋冬低的季节变化特征,夏季可溶性离子浓度最高。     

Stability analysis of submarine slopes in the area of the test production of gas hydrate in the South China Sea

In this paper, the mechanical properties of gas hydrate-bearing sediments (GHBS) were summarized and the instability mechanism of submarine hydrate-bearing slope (SHBS) was analyzed under the background of the test production of gas hydrate in the northern part of the South China Sea. The strength reduction finite element method (SRFEM) was introduced to the stability analysis of submarine slopes for the safety of the test production. Two schemes were designed to determine the physical and mechanical parameters of four target wells. Through the division of the hydrate dissociation region and the design of four working conditions, the range and degree of hydrate dissociation at different stages during the test production were simulated. Based on the software ABAQUS, 37 FEM models of SHBS were set up to analyze and assess the stability of the submarine slopes in the area of the test production. Necessary information such as safety factors, deformation, and displacement were obtained at different stages and under different working conditions. According to the calculation results, the submarine slope area is stable before the test production, and the safety factors almost remains the same during and after the test production. All these indicate that the test production has no obvious influence on the area of the test production and the submarine slopes in the area are stable during and after the test production.     

吹扫捕集-气相色谱-质谱法测定土壤中挥发酚的方法研究

文章研究了吹扫捕集-气相色谱-质谱法测定土壤中挥发酚的方法,分析了吹扫捕集各参数对挥发酚测定的影响,优化了吹扫捕集条件和气相色谱-质谱条件。通过与索氏提取技术对比,证明吹扫捕集-气相色谱-质谱法在实际样品检测中具有操作简便、分析周期短、试剂用量少、干扰小等优点,适用于测定沸点较低、溶解度较小的挥发酚,推荐选择经典的索氏提取技术测定沸点较高、溶解度较大的挥发酚。     

分形方法在海洋溢油的气相色谱鉴别中的应用研究

将分形理论应用于溢油的气相色谱鉴别,建立了一种新的海洋溢油气相色谱鉴别方法。即首先采用小波分解将气相色谱图曲线分解至不同的尺度,计算各尺度曲线分量的分形维数,基于分形维数参量,采用欧几里得距离判断不同样品气相色谱曲线的近似程度,达到对溢油样品进行鉴别的目的。溢油事故实例数据分析表明,分形维数能较好的反映不同色谱曲线的差异,所建立的方法在筛选溢油样品时,能在一定程度上缩小鉴别范围,可作为溢油鉴别的一种有效辅助方法。     

甘肃省氡观测资料地震监测效能评估及其结果分析

根据中国地震局监测预报司关于前兆观测资料监测评估工作的要求,对甘肃19个模拟氡观测、8个数字化气氡观测点的观测资料,从观测资料质量、基础资料、震例等三个方面进行监测效能评估评估。评估结果为A级8个测点,B级7个测点,C级9个测点,D级3个测点。