高效阴离子交换色谱-紫外检测器联用测定海水中碘   总被引：1，自引：0，他引：1  

墨淑敏梁立娜  蔡亚岐牟世芬 温美娟 《岩矿测试》2006,25(2):122-124

建立了在碱性体系中采用高效阴离子交换色谱和紫外检测器联用测定海水中碘离子的分析方法。以63mmol／L NaOH为淋洗液，利用IonPac AS16型强亲水性阴离子交换分离柱．碘离子在8．3min洗脱，经抑制器后进入紫外检测器在波长226nm处检测。方法的检出限为0．05μg／L（进样量500μL，3倍信噪比），标准曲线的线性范围为1～2000μg／L（r=0．9995）。20μg／L碘离子标准溶液9次连续进样的相对标准偏差为1．85％。方法已成功地应用于海水中碘离子的测定，1μg／L碘离子的加标回收率为98％～105％。  相似文献   

固相萃取-气相色谱／质谱法测定地面水中半挥发性有机物   总被引：1，自引：0，他引：1  

郁建栓 《岩矿测试》2006,25(4):331-333

利用XAD-2和XAD-8树脂吸附富集、有机溶剂洗脱、气相色谱／质谱法分析测定了福建九龙江流域水体中半挥发性有机化合物，共检出有机化合物138种，其中属于美国联邦环保总署和中国国家环保总局规定的优先控制有机污染物有20种。  相似文献   

新的机遇,新的挑战--关于"十五"工作的设想   总被引：1，自引：1，他引：0  

王椿镛  吴忠良  陈运泰 《国际地震动态》2000,(5):1-4

地震科学经历近百年的发展,现已步入中年.文章介绍针对地震科学当前面临的主要问题,IASPEI采取的措施和努力的方向,其中强调了宽频带数字地震观测在地震研究中的作用.这些背景值得我们在编制"十五"规划时借鉴.  相似文献   

基于9210工程的通用气象信息编辑与传输系统     

庞芳  李昭春  赵智  王萍 《气象研究与应用》2004,25(1):47-48

介绍通用气象信息编辑、传输系统的设计方法、主要功能模块及其技术实现。  相似文献   

Use of Chelating Resin YPA₄ Micro-Columns for the On-Line Preconcentration and Separation of Gold(III), Silver(I), Palladium(II) and Platinum(IV) in Geological and Environmental Samples and Their Determination by Inductively Coupled Plasma-Atomic Emission Spectrometry     

Yiwei Wu  Zucheng Jiang  Bin Hu 《Geostandards and Geoanalytical Research》2004,28(3):383-390

A simple and selective method of flow injection (FI) using a micro-column packed with chelating resin YPA₄ as solid phase extractant was developed for the preconcentration and separation of trace amount of noble metals, Au(III), Ag(I), Pd(II) and Pt(IV), followed by ICP-AES determination. In HNO₃ media, the chelating resin was selective towards Au(III), Ag(I), Pd(II) and Pt(IV), and the analysed ions were readily desorbed quantitatively with 5 ml of 2.5% m/v thiourea. Effects of acidity, sample flow rate and concentration, elution solution and interfering ions on the recovery of the analytes were systematically investigated. Under optimum conditions, the adsorption capacities of YPA₄ for Au(III), Ag(I), Pd(II) and Pt(IV) were 67.2, 43.1, 64.8 and 27.6 mg per gram of resin in HNO₃ media, respectively. It was found that YPA₄ could be used for more than eight runs in HNO₃ media without loss of capacity. The proposed method was used for the determination of trace noble metals in geological and environmental samples, and the analytical results obtained were in good agreement with the recommended values.  相似文献   

New Zealand since 1984: Elite succession, income distribution and economic growth in a small trading economy     

Geoff Bertram 《GeoJournal》2004,59(2):93-106

Four interrelated patterns of structural change in the New Zealand economy since 1980 are identified and analysed, against the backdrop of a growth rate which fell substantially behind the rest of the OECD in the late 1980s and early 1990s before recovering, but without catchup, from 1993. The changes discussed are: a shift in sharemarket capitalization from formerly-dominant productive activities in agriculture, manufacturing and construction to the current predominance of utilities, transport and finance; a sharp increase in overseas investors' share of the economic surplus, from around 20% to over half of post-tax corporate profits; a steady rise in international indebtedness at the same time as sovereign foreign-currency debt was eliminated; hence overseas debt was successfully privatized; a weakening of regulatory control over monopoly profits, opening the way for a surge of rent-seeking activity during the 1990s. The neoliberal reform programme has achieved fiscal and monetary sustainability, increased market flexibility, and insulated the economy against external shocks. At the same time it has led to denationalisation of economic surplus, ongoing current account deficits, and a significant diversion of resources from productive use into rent-seeking. This revised version was published online in July 2006 with corrections to the Cover Date.  相似文献   

REYNOLDS EXCHANGE IN THE ATMOSPHERIC MULTI-SCALE MOTIONS          下载免费PDF全文

Xu Dahai 《Acta Meteorologica Sinica》1994,8(2):203-219

In this paper the system of Reynolds equations of the multi-scaled atmospheric motions is set up based on the con-cept of decomposing the meteorological elements into multi-scale disturbances.It is proved to be true that the Reynoldsexchange term in the averaged motion is equal to the sum of averaged nonlinear terms in all sub-averaged motions.Inorder to avoid the higher order closure in Eulerian approaches,a new K-theory based on the multi-scaled Reynoldsequations is given in which the subscale motions are described by Langevin equation as the air particles are moving inthe Eulerian average background.From the new K-theory are derived the momentum,heat and mass exchangecoefficients as the functions of statistical variables such as variances and Lagrangian time scales of velocity,temperatureand other meteorological elements in disturbances.The new K-theory also expounds the causes for the differences be-tween the exchange coefficients of one element and another and gives the ambient conditions in which the buoyancyand/or Coriolis force Will build the chaotic disturbances into the orderly gradient of mean values of the correspondingelements.In consequence the K-theory can be used to explain some of negative viscosity phenomena in atmospheric mo-tions.  相似文献   

石墨炉原子吸收光谱法测定地质样品中的痕量铂、钯   总被引：1，自引：0，他引：1  

裴玲云 《铀矿地质》1993,(4)

本文提出了用717阴离子交换树脂富集铂、钯的石墨炉原子吸收光谱分析方法。对富集铂、钯的条件,共存离子的干扰情况以及在GF-2000型石墨炉中测定铂、钯的最佳条件进行了研究。样品用王水分解后,在10％的王水介质中,用717阴离子交换树脂富集铂、钯,以热的硫脲溶液解脱,在拟定的工作条件下,于石墨炉原子吸收光谱仪上进行测定,大量的共存离子不干扰测定。方法简便快速,检出限分别为Pt8.8×10~(-9)g/ml,Pd3.4×10~(-9)g/ml,方法的相对标准偏差分别为Pt7.09％Pd11.48％,适用于地质样品中铂、钯的测定,结果令人满意。  相似文献   

焦家式金矿水－岩交换作用─—成矿流体氢氧同位素组成研究   总被引：7，自引：0，他引：7  

张理刚  陈振胜  刘敬秀  于桂香  王炳成  徐金方  郑文深 《矿床地质》1994,(3)

焦家式金矿位于胶东半岛西北部，矿体赋存于花岗片麻岩－花岗闪长岩类岩石断裂带内，呈破碎黄铁绢英岩化浸染状矿石。矿体中均伴有富含金的成矿前、后中基性脉岩。成矿作用包括乳白色块状黄铁矿石英和（或）伟晶石英脉阶段、含金硫化物石英阶段和方解石石英阶段。三个阶段石英δ￣（１２）Ｏ值平均为１２．４‰、１３．２‰和１４．４‰。计算的石英δ￣（１８）Ｏ＿（Ｈ＿２Ｏ）值平均分别为４．７‰、３．５‰和３．５‰。三个阶段石英流体包裹体水δＤ＿（Ｈ＿２Ｏ）值平均分别为－７３‰、－８０‰和－９２‰。经反演计算，提出成矿流体是中生代大气降水（δ￣（１８）Ｏ＝－１５．５‰，δＤ＝－１１５‰）与５ｋｍ以下深部中基性岩在３５０～４００℃时，有效Ｗ／Ｒ比值从０．０１至０．０５之间交换作用形成。  相似文献   

多孔介质中酚醛树脂冻胶动态成胶规律   总被引：1，自引：1，他引：0  

史胜龙  王业飞  于海洋  吕鹏 《东北石油大学学报》2012,(1):41-46,63,4

为认识酚醛树脂冻胶在多孔介质中动态成胶行为,通过测定黏度和注入压力随成胶时间的变化,研究酚醛树脂冻胶在安瓿瓶和多孔介质中的静态成胶及多孔介质中动态成胶过程;考察聚合物和交联剂质量分数对成胶时间和冻胶强度的影响.结果表明:静态条件下,酚醛树脂冻胶在多孔介质中的初始和最终成胶时间分别为安瓿瓶内成胶的1～1.5倍和1.5～2倍;多孔介质中,动态初始和最终成胶时间分别为静态条件下的2倍和2～3倍;随聚合物和交联剂质量分数增大,成胶时间缩短,冻胶强度增大,但在成胶过程中冻胶向深部运移的能力降低.后续水驱结果表明:动态成胶过程中,冻胶封堵位置主要集中在岩心入口端,封堵率达99.8%以上;只有当酚醛树脂冻胶可以在多孔介质中产生明显的运移时,冻胶体系才具有深部调剖的能力;当多孔介质的渗透率为8μm2左右,HPAM质量分数小于0.2%,酚醛树脂预聚体质量分数小于0.6%时,冻胶可以进行深部调剖.多孔介质中静态成胶形成的为整体冻胶,而动态成胶形成的为分散的冻胶颗粒.  相似文献