光度检测离子色谱法测定大豆中的植酸

本文介绍了用光度检测离子色谱法分离分析植酸的适宜条件。以NaNO_3和HNO_3为淋洗液,用磺基水杨酸和三氯化铁为柱后衍生试剂,使用国产YSA型阴离子分离柱分离和测定了大豆中的植酸,得到满意的结果。     

新显色剂1-羟基-2-(5-NO2-2-吡啶偶氮)-8-氨基-3,6-萘二磺酸与铜显色反应的研究

探讨了新显色剂 1-羟基-2-(5-NO2-2-吡啶偶氮)-8-氨基-3,6-萘二磺酸(简称5-NO2-PAH)与铜离子显色的适宜条件及其共存离子的影响,建立了 5-NO2-PAH测定铜的新显色反应体系.在 pH 7.0～10.0 范围内,铜与试剂形成稳定的 1∶2 配合物,其最大吸收峰位于 653 nm, 表观摩尔吸光系数εCu=4.68×104 L·mol-1·cm-1,铜的浓度在 0 μg/10 mL～14 μg/10 mL 范围内遵守比尔定律.方法已用于合金中铜的测定.     

高碘酸法测定水中锰的改进

介绍了一种室温下测定水中锰的方法，经检验，其显色反应可在短时间内完成，且色泽稳定，精密度和准确度均能达到分析要求。     

氨基酸的光化学诱导动态核极化

维生素B₂与氨基酸和氨基酸衍生物水溶液体系的光化学诱导动态核极化(photo chemically induced dynamic nuclear polarization, CIDNP)研究表明,在维生素B₂作为光敏化剂的体系中,N-乙酰-L-酪氨酸和N_α-乙酰-L-组氨酸显示很强的极化信号,而其它氨基酸和衍生物则未观察到。     

羟基喹啉偶氮类化合物的互变异构与顺反异构的研究

本工作合成了数种带不同取代苯基的羟基喹啉偶氮类化合物。对它们在不同溶剂。不同酸碱度溶液中的偶氮式及腙式间互变异构平衡进行了研究。苯环上不同取代基的引入可引起平衡发生变化。拉电子基的引入有利于腙式结构的形成,而推电子基的引入则对偶氮的生成影响不大。此外,工作中还发现:羟基喹啉偶氮化合物在光照下存在着以偶氮顺-反异构化反应为主的变化过程。     

高效液相色谱法分离和测定面粉中增白剂过氧化苯甲酰

提出了用高效液相色谱分离和测定面粉中增白剂过氧化苯甲酰的新方法。用乙醇为熔剂通过超声提取面粉中的过氧化苯甲酰，在氢氧化钾存在下使之转化为苯甲酸，再用HPLC进行测定，具有良好的准确度和再现性。     

Molecular magnet based on the FeII,III complex with squaric acid

The reaction of Fe^II and Fe^III salts with tetrabutylammonium squarate in an aqueous solution gives rise to a new molecular magnet (T _c = 8.6 K).     

Investigations for Modification of Polyacrylamide-Bentonite by Phytic Acid and its Usability in Fe3+, Zn2+ and UO2 2+ Adsorption

Composite of polyacrylamide-bentonite (PAA-B) was prepared by direct polymerisation of PAA in a suspension of bentonite (B). Adsorption and thermodynamic features of phytic acid (Phy) adsorption onto B, PAA and PAA-B, and those of Fe³⁺, Zn²⁺, UO₂ ²⁺ adsorption onto PAA-B and its modification by Phy (PAA-B-Phy) have been investigated. The reusability, storagability, ion selectivity and recoverability of sorbed ions with 1 M HCl have also been considered.The chemical and physical structure of adsorbents has been characterised by means of FT-IR and XRD. All adsorption isotherms for Phy and the ions were L-type of the Giles classification except, the one which is S type for adsorption of Phy onto PAA. The maximum adsorption capacities for the ions adsorbed were in order of UO₂ ²⁺ > Fe³⁺ > Zn²⁺ for PAA-B and Zn²⁺ > Fe³⁺ > UO₂ ²⁺ for PAA-B-Phy. Langmuir equilibrium constants for the adsorption of ions onto PAA-B-Phy were significantly higher than those found for PAA-B; the magnitude of increase for UO₂ ²⁺ was about 100. The thermodynamic parameters indicated that adsorption reactions are spontaneous in terms of adsorption free enthalpy.The chemical structure of PAA-B-Phy was not changed at the end of the studies of reusability and storagability. The composite was selective for UO₂ ²⁺ of the ions of interest.The composite of PAA-B and its modification by Phy have been used for the first time in this investigation. It is proposed that the composites can be practically used in the investigations and applications of adsorption.     

Oxidation of Aromatic Amines to Quinones by Iodic Acid under Microwave Irradiation in the Presence of Montmorillonite K10 and Silica Gel

Summary. A variety of aromatic amines are oxidized to their corresponding quinones in excellent yields by supported iodic acid under microwave irradiation and solvent free conditions.     

YDHC-10催化剂用于不饱和植物油脂肪酸氢化工艺条件的研究

采用自制的催化剂YDHC-10对氢化工艺条件进行了研究。找出了植物油脂肪酸氢化时,氢化压力2MPa、氢化温度180-200℃、氢化时间60min以及催化剂浓度对植物油脂肪酸氢化的影响．