SHORT COMMUNICATION A PROGRAM FOR THE SIMULTANEOUS POTENTIOMETRIC DETERMINATION OF PROTONATION CONSTANTS AND ELECTRODE CALIBRATION PARAMETERS

A program for the potentiometric determination of the protonation constants of mononuclear polyproticsubstances is described.A maximum of twelve parameters can be determined simultaneously,includingup to six protonation constants,four electrode calibration parameters,the protolysis constant of thesolvent and the titrant concentration.Optimization is carried out by using the non-simplifiedNewton-Raphson method,which is potentiated by the Marquardt algorithm and a distance speeding-upcoefficient.A direct search method is also used to improve the initial set of values.Variances arecalculated very accurately,since the real Hessian function is used.Statistical weights and ionic strengthcorrections are also considered,The program has been tested by using simulated titration curves ofpolyprotic acids with close constants.     

陕西省丹凤地区商丹断裂南侧糜棱岩的岩石学研究

以往都将研究区内商丹断裂南侧的岩石定为角岩化碎屑岩或火山岩,划归泥盆系青石垭组或加里东蛇绿岩套。笔者认为这些岩石是一套糜棱岩,不是一个独立的地层单位。对该区的长英质、富铝质、斜长角闪质和碳酸盐质四类糜棱岩,分别做了岩相学特征描述。通过化学成分、矿物成分、碎斑矿物特征和变余构造恢复了各种糜棱岩的原岩。并讨论了这些原岩的时代归属,认为这些原岩分别来自秦岭群、丹凤群和中泥盆统,说明有不同时代、不同成因的地质体卷入了这条韧性剪切带。     

测定水中硫酸根方法的概述

介绍了测定水中硫酸根的方法和几种常用方法在水质分析中的应用。     

汕头地区地壳平均波速比的联合测定

本文根据汕头传输台网测定的96次地震走时数据,用联合测定法计算了该区地壳波速比,得到地壳平均波速比为1.707±0.005。此值较华南区域平均波速比1.692略高。因研究时段区内无M≥5级地震,故1.707±0.005应视为该区地壳波速比正常背景值。     

用ASTER数据提取云南个旧西区矿化蚀变信息

以ASTER影像为数据源、野外实测波谱数据为参考,用光谱角分类法（SAM）在个旧矿区提取矿化蚀变信息。为剔除假“异常”信息,用ASTER热红外波段的比值计算定义硅酸盐、碳酸盐和超基性岩指数作RGB合成得反应岩性信息的影像,据此确定西区重点研究区。在此区域再次用SAM提取矿化蚀变信息,结合用ASTER短波红外数据的比值计算增强的构造信息,分析提取的重点研究区矿化蚀变信息结果,为该矿区找矿工作提供了参考。     

EH-4连续电导率剖面法在金牛厂铅锌矿的应用

金牛厂铅锌矿产状陡、下延不清,采用其他物探方法效果不够好,本文介绍在该区开展EH4方法有效性研究及其成效。     

原子荧光光度法测定地质化探样品中的砷、锑、铋

原子荧光光度法分析As、Sb、Bi已被广泛应用，但由于仪器没有色散系统，所以干扰因素较多。阐述了原子荧光光度分析法中常见的干扰及其消除方法。方法简单、快速、灵敏、低耗。     

The determination of total dissolved free primary amines in seawater: Critical factors, optimized procedure and artefact correction

The paper reviews the methods described in the literature for the determination of total dissolved free primary amines (TDFPA) by fluorescence. A wide set of reaction conditions can be found, but they rely on few experiments for their validation. Among fluorogenic compounds, o-phthaldialdehyde (OPA) is more sensitive than fluorescamine and was thus examined here. However, the use of mercaptoethanol (ME) in the reaction (as an additional derivatization compound) is able to generate unreliable results, in particular when standardization relies on glycine. We suggest replacing ME with 3-mercaptopropionic acid (MPA) which induces more stable and comparable fluorescence among amine compounds. A systematic study was therefore undertaken to define reagent concentrations and pH effects on the reaction rates for a variety of primary amines with particular focus on amino acids. The reaction rate is increased by increasing OPA concentration and pH, but slowed by excess MPA. Ammonium interference is influenced by several factors, but spectral investigation showed that the choice of conditions can drastically reduce it. The magnitudes of natural and OPA-induced background fluorescence signals have been assessed in various mediums and it is shown that their contribution to the signal amounts to a large fraction, when not most, of the measured fluorescence. A segmented flow method is proposed with a protocol for adequate correction of biases.     

浮游植物叶绿素a 含量测定方法的比较及优化

比较了丙酮萃取法和乙醇-超声波法测定水体中叶绿素a的方法,并对后者进行优化。结果显示,乙醇-超声波法的萃取效率显著地高于丙酮法的效率,两种方法的相关系数为0.9990,回归方程为Chla丙酮=1.0932Chla乙醇–11.677。优化后的乙醇-超声波法的最佳处理条件为:带样滤膜–20℃,冰冻24 h以上,加适量80℃热乙醇在80℃水浴中解冻,经超声振荡处理3 min后,室温黑暗条件下萃取6 h,再离心定容测定。     

一种确定大小地震比例的新方法及其在地震预报中的应用

本利用贝叶斯判别准则,提出了一种确定大小地震比例的新方法,并以１９８９年山西阳高地震和１９８３年山东荷泽地震为例,说明了此方法在震预报中应用的可能性,并说明对弱地震活动地区,本方法具有明显的可行性。