交联壳聚糖在化学形态分析中的应用

简要介绍了近年来汞、铬、硒、锡和锑的化学形态分析进展，并详尽介绍了一种新的选择性富集分离试剂——交联壳聚糖在化学形态分析中的应用情况，综述了交联壳聚糖及其衍生物在化学形态分析中的广泛应用．     

联用技术在砷形态分析中的应用进展

综述了高效液相色谱与原子吸收光谱、原子发射光谱、原子荧光光谱和电感耦合等离子质谱等联用技术以及毛细管电泳原子荧光光谱联用技术在砷形态分析中的应用研究新进展,并对砷形态分析中的样品贮存、前处理技术进行了总结和评述。     

交联改性壳聚糖在棉织物活性染料染色中的应用

采用交联改性降解壳聚糖对棉织物进行接枝改性,考察壳聚糖接枝改性对棉织物雷马素活性染料染色性能的影响.结果表明:棉织物经壳聚糖改性后,增加了织物表面对染料阴离子的亲和力和固着力,上染率和K/S值都有所提升,其固色率也有很大提高,均达80%以上;经雷马素红RR和雷马素黄RR染色后,改性棉织物的干、湿摩擦牢度和耐皂洗褪色同未改性棉织物一样,分别为4、3~4和4级,耐皂洗沾色降低半级,为3~4级.用雷马素蓝RR染色后,改性棉织物干摩擦牢度提高半级,达4级,湿摩擦牢度和耐皂洗等级同未改性棉织物一样,分别为3~4和4级.     

交联黄原酸壳聚糖的制备及性能

以壳聚糖为原料,制备出交联黄原酸壳聚糖。考察pH值、温度、时间、Pb⁽²⁺⁾初始浓度等因素对吸附性能的影响。实验研究表明:在铅离子初始浓度为3.0 mmol/L,pH=5,25℃吸附100 min的条件下,改性壳聚糖对铅离子的吸附效果最佳。该研究可为废水处理提供新思路。     

砷化学形态分析研究进展

文章总结了近年来砷形态和痕量分析研究进展，包括分离、测定方法的进展情况。     

交联壳聚糖的合成及其对重金属离子吸附的研究进展

壳聚糖是一种天然高分子,分子中含有大量的氨基和羟基,对金属离子有很好的吸附能力。通过交联改性的方法可以提高壳聚糖的物理、化学性质。从直接交联、交联中进行化学修饰、分子印迹法交联3个方面简要介绍了交联壳聚糖的合成和对重金属离子吸附的研究进展。     

交联球型壳聚糖的研制

本文采用单凝固-交联法制备交联球型壳聚糖,并考察了各种因素对产品性能的影响。结果表明：交联反应是在壳聚糖的氨基上进行的,单凝固-交联法制备交联球型壳聚糖,其颗粒的均匀性和成球性较好。     

模板交联壳聚糖对模拟三价核素吸附性能研究

文章以钕离子为模板、戊二醛为交联剂,合成了钕模板交联壳聚糖;考察了pH值、吸附时间、Nd(Ⅲ)初始质量浓度对钕模板交联壳聚糖吸附性能的影响,得到钕模板交联壳聚糖吸附Nd(Ⅲ)的最佳条件为:pH值为6～8,Nd(Ⅲ)的质量浓度为57.14 mg/L,吸附时间为2h.在此条件下模板交联壳聚糖对Nd(Ⅲ)的吸附容量为41.0...     

砷在环境中的存在形态

前言利用砷及其化合物作为杀虫剂和杀菌剂已有悠久的历史,尤其是我国,使用历史更久远。环境砷污染对人体产生种种危害,甚至中毒死亡,已多有报导,砷及其化合物可致皮肤癌也早有报导。但是另一方面,如果均匀饮用极微量的砷,可使人强健身体,使妇女的肌肤更加光润鲜嫩。用砷作为治疗药物也有悠久历史。如治疗牛皮癣等,砷的有机化     

藻类中砷的形态分析研究

采用原子荧光光谱法,研究了藻类中砷的形态分析,测定3种藻类中的有机砷和无机砷。在选定的试验条件下,方法检出限为0.01 mg/kg和0.04 mg/kg;进行3种藻类样品的测定,相对标准偏差为1.32%～4.65%、2.78%～6.15%,加标回收率为83.85%～100.58%、78.12%～111.18%。样品处理简便快速,线性范围宽,基体干扰小,精密度、准确性均能满足藻类中的形态分析。     

Applications of crown ether cross-linked chitosan for the analysis of lead and cadmium in environmental water samples

A new type of crown ether cross-linked chitosan was synthesized by the reaction of chitosan with 4,4′-dibromodibenzo-18-crown-6 (Br-DBC). Its token structure was analyzed with FT-IR and NMR and the adsorption behaviors for lead and cadmium in environmental water samples by FAAS were studied. In addition the best analysis conditions were discussed and the adsorption mechanism was explained. As the enrichment factor is above 100, both recoveries are 94%–106%, the detection limits of lead and cadmium are 0.5μg·L⁻¹ and 0.04 μg·L⁻¹ and the relatively standard deviations of lead and cadmium are 3.1% and 2.8% respectively, this new method was successfully applied to the determination of environmental water samples. This method is fast and simple and it greatly enhances the determination ability of FAAS for lead and cadmium. Foundation item: Supported by the State Education Committee Doctoral Foundation (No. 2000048615) Biography: Tang Yu-rong(1943-), female, Associate professor, research direction: trace elements analysis.     

砷矿区受污染土壤中As赋存形态分析

对云南省楚雄州某废弃砷矿区的土壤采取4个样品进行分析,采用BCR法对该矿区土壤中砷的弱酸提取态、可还原态和可氧化态、总态4种存在形态进行提取研究.结果表明该砷矿区土壤重金属最大含量达465.125 5 mg/kg,从砷的存在形态来看,主要以残渣态砷为主,含量达280.2 mg/kg,占到砷含量的67.11%.该矿区土壤已经受到严重污染,且以残渣态砷为主,属于难处理废物,对当地的水环境和土壤健康存在环境风险.     

Recent advances in speciation analysis of mercury, arsenic and selenium

Mercury(Hg),arsenic(As) and selenium(Se) are ubiquitous in the environment and exist in a variety of species,which have great influence on their transport,bioaccumulation and toxicity.This review presents the recent research progress in speciation analysis of Hg,As,and Se,with emphasis on enhanced cold vapor generation as interface for liquid chromatography and atomic spectrometry,speciation of volatile species in gas phase,and isotope dilution technique to improve the precision and accuracy of speciation.Hyphenated techniques to characterize the complexes of Hg and As with phytochelatins and chromatographic separation coupled with multi-collector-inductively coupled plasma mass spectrometry to measure species-specific isotopic ratios,are also briefly discussed.     

Laser photolysis of indolinospirobenzopyran bearing crown ether moity

The photochromic reaction of the indolinospirobenzopyran possessing a monoaza-benzo-15-C-5 at the 1′-position with or without alkali-metal cation as studied using nanosecond laser photolysis technique. Supported by the National Natural Science Foundation of China and the Special Funds of the State Education Committee for Doctorate Scientific Research Wu Xinyan: born in March, 1971, Ph. D. graduate student     

含脲官能团的新型二茂铁开链冠醚受体的合成

以1,1’-二茂铁二甲酰氯为原料,合成了含脲官能团的新型二茂铁开链冠醚受体,并通过IR,^1H NMR等手段对其进行了表征。     

Synthesis and properties of crown ether benzotellurazole heterocyclic styryl cyanines and merocyanines

Two Crown ether benzotellurastyryl cyanines and three crown ether benzotelluramerocyanines are synthesized via the key intermediate-3-methyl-5,6(15-crown-5)-2 (β-acetanilide) vinyl benzotellurazolium iodide. The reactive conditions are discussed. The influence of alkali (-earth) metal ions on the visible absorption spectra of these two types of crown ether cyanines are also studied. Supported by the National Natural Science Foundation of China Ke Weijun: born in 1971, Ph.D.     

浊点萃取-原子光谱法在金属离子形态分析中的应用

简要介绍了浊点萃取的原理及其与原子光谱技术的联用,综述了近十年来应用浊点萃取法分离富集、原子光谱法测定多种金属离子不同形态含量的进展,对浊点萃取与光谱法联用在测定不同形态金属离子含量方面的发展进行了展望．     

固相萃取与新银盐法联用测定水样中无机砷的形态

建立了活性碳负载APDC固相萃取与新银盐法联用分别测定水样中微量不同价态As(Ⅲ/Ⅴ)的新方法。实验表明:在pH为1.8～2.5的水溶液中,负载活性碳对As(Ⅲ)可选择性吸附,探讨了影响固相萃取的时间、酸度等主要因素,吸附率最高可达到90%,回收率大于90%.     

Synthesis and ion-binding studies of platinum(II) phenanthroline complexes containing crown ether moiety

Square-planar platinum(II) polypyridyl complexes represent an important class of compounds that possess a rich range of spectroscopic and photophysical proper- ties[1―17]. Some of them have demonstrated promise in wide-ranging applications including opti…