蒙成药吉如很阿嘎如-8中多糖的组分和糖含量

本文介绍了提取吉如很阿嘎如－8中水溶性多糖的方法，并用硫酸－苯酚法测定了该药中水溶性多糖的含量。回收率为99．3％－100．5％，RSD为0．90％。用气相色谱法测定了吉如很阿嘎如－8的水溶性多糖，它是由阿拉伯糖、木糖、甘露糖、半乳糖、葡萄糖等组成。它们的摩尔比为：1．00：0．76：3．61：2．88：5．00。     

The influence of different salting-out agents on the extraction of Ce,Eu, Gd,Tb using tri-n-butyl phosphate

The extraction enthalpies H ^o of Ce, Eu, Gd, Tb nitrates usingTBP in the presence of different salting-out agents in aqueous phase were determined. It was established that the extraction process is the most exothermic in the case of LiNO₃.

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Der Einfluß verschiedener Aussalzmittel auf die Extraktion von Ce, Eu, Gd und Tb mit Tri-n-butylphosphat

Zusammenfassung Es wurden die Extraktionsenthalpien H ^o von Ce-, Eu-, Gd- und Tb-Nitrat unter Verwendung vonTBP in Gegenwart verschiedener Aussalzmittel in wäßriger Phase bestimmt. Es wurde festgestellt, daß der Extraktionsprozeß im Fall von LiNO₃ am meisten exotherm verläuft.

     

气相色谱／质谱／计算机法分析松口蘑子实体和菌丝体中的香成分

本文用顶空收集法和蒸馏－萃取法提取富集了松口蘑子实体和菌丝体中的香成分，经色谱／质谱联机分析，在子实体中测得６４种香成分，并首次在菌丝体中测得３６种香成分。菌丝体中有２８种组分与子实体香成分相同。为深入研究和开发珍贵的松口蘑提供了科学依据。该提取方法充分有效；该分析方法简便，灵敏度高，可做为分析天然产物香成分时参考。     

用小波变换方法从强噪光谱中提取锑的弱信号

ICP－AES法测定样品中低含量锑时，信噪比很低，准确度和精密度差，用小波变换法对强噪光谱进行处理后，有效地消除了噪声，提高了信噪比，改善了分析结果的准确性和重现性。     

Determination of anionic surfactants by bis(ethylenediamine)copper(II) extraction and anodic stripping voltammetry

A stripping voltammetric finish for the measurement of total anionic surfactant has been developed. A limit of detection of 5.0 μg 1^?1 anionic surfactant was observed with a linear calibration from 5.0 to 500 μg 1^?1 in the original sample.     

2-(2-吡啶偶氮)-5-二甲氨基酚固相萃取光度法测定饮用水中铜

根据2-（2-吡啶偶氮）-5-二甲氨基酚（PADMAP）与铜的显色反应及Waters Porapak^RSep-Park固相萃取小柱对显色络合物的固相萃取，建立了一种测定水样中μg/L级铜的新方法。在Ph=6.0的HAc-NaAc缓冲介质中，溴化十六烷基三甲基铵（CTMAB）存在下，PADMAP与铜反应生成2：1稳定络合物，该络合物可用Waters Porapak^R Sep-Park固相萃取小柱富集，用乙酰洗脱后用光度法测定，可测定水样中μg/L级的铜。方法用于几种饮用水中铜的分析，结果令人满意。     

Liquid–liquid equilibrium for the system water + acetic acid + 1-heptanol at 278.1, 293.1, 303.1 and 313.1 K

Liquid–liquid equilibrium (LLE) for the system water+acetic acid+1-heptanol have been studied at atmospheric pressure in the temperature range of 278.1–313.1 K. The raw experimental data of this work, together with the available experimental data in the literature on the same ternary system, are analyzed and compared. The analysis is achieved by using three versions of the well-known UNIFAC model. The comparison is made in terms of root-mean-square (RMS) in temperature and composition, maximum deviation (MAXDEV) in temperature, and the average-absolute deviations (AAD) in compositions. In all of these models, the interaction parameters employed are those provided by Aspen Plus library. All models predict much lower deviations and RMS values for the data of this study than those for the data of the literature.     

Solvent extraction of tetravalent selenium

Summary A systematic study has been carried out on the extraction of SeI₄, by various water-immiscible organic solvents. Extraction has been investigated as a function of H₂SO₄ and KI concentrations. It has been found that the Se(IV) extraction is appreciably increased by addition of iodide ion to sulphuric acid solutions. In addition, the presence of water-miscible alcohols and acetone was found to enhance Se(IV) extraction from H₂SO₄-KI solutions. In the light of the obtained results an extraction mechanism is suggested.

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Untersuchungen zur Extraktion von vierwertigem Selen

Zusammenfassung Es wurde eine systematische Untersuchung zur Extraktion von SeI₄ mittels verschiedener mit Wasser nicht mischbarer organischer Lösungsmittel unternommen. Es wurde die Abhängigkeit der Extraktion von der Konzentration an H₂SO₄ und KI untersucht, wobei sich zeigte, daß die Se(IV)-Extraktion durch Zusatz von Iodid-Ionen zur schwefelsauren Lösung beträchtlich zu steigern ist. Weiters wurde gefunden, daß der Zusatz von wassermischbaren Alkoholen oder Aceton ebenfalls die Extraktion aus H₂SO₄-KI-Lösungen verbessert. Auf Basis dieser Resultate wird ein Extraktionsmechanismus vorgeschlagen.

     

Selective extraction of palladium(II) using hydrazone ligand: A novel fluorescent sensor

The acyclic tridentate blue luminescent ligand (λ_ex=300 nm, λ_em=415 nm) quinoline-2-carboxaldehyde 2-pyridylhydrazone, HL, 1, was recognized as a new fluorescent chemosensor for Pd²⁺. In alkaline methanol complete fluorescent quenching was observed in the presence of 2 equivalents of Pd²⁺ that was further reflected in the solid phase fluorescence microscopic study.Ligand formed 1:1 complexes with Ni²⁺, Cu²⁺, Zn²⁺, Pd²⁺ and 1:2 complexes with Co²⁺, Fe²⁺ as obtained from Job's plot of continuous variation. The binding constants of different metal complexes (Fe²⁺, Co²⁺, Ni²⁺, Cu²⁺, Zn²⁺ and Pd²⁺) were estimated by fluorescence titrations. The ligand can selectively extract significant amount of Pd²⁺ from the aqueous mixture of metal ions, and the extraction efficiency was increased from 80% to 95% with increase in the molar ratio of HL, 1, to Pd²⁺ from 1 to 3. No significant interference was observed up to 2-fold excess addition of Cu²⁺ and Zn²⁺ and 100-fold excess addition of Co²⁺, Fe²⁺ and Ni²⁺over the Pd²⁺ ion concentration (1.0×10⁻³ M).