卡尔曼滤波—分光光度法同时测定稀土

研究了卡尔曼滤波分光光度法。借助偶氮氯膦Ⅲ灵敏显色反应并结合最佳递推滤波数据处理方法,使本法兼具灵敏度高与选择性好的优点。该法已应用于混合稀土(镧、镨、钕、钐)的同时测定,也可用于单一稀土(钕)的选择测定。方法简便灵活。     

牛磺熊去氧胆酸的合成研究

以熊去氧胆酸为原料，先与氯甲酸乙酯形成混酐，再与牛磺酸反应合成牛磺熊去氧胆酸。通优化反应条件、简化后处理等工艺改进，提高了收率，得到了较高纯度的结晶产品。     

硫酸根的分光光度法测定

本文就硫酸根的间接及直接光度测定的基本原理，试剂，方法和应用等作了较为系统的评述。列出重要文献６７篇。     

分光光度法测定甲醛

重点论述了各种测定甲醛的分光光度法的现状及其改进,目前存在的不足之处及面临问题,同时展望了该法的前景。     

分光光度法测定多巴胺

根据多巴胺与亚硝酸钠在pH 5 .90时的反应产物在 30 0nm处有最大吸收 ,建立了测定多巴胺注射液中多巴胺浓度的分光光度法。多巴胺质量浓度在0～ 1 0 μg mL范围内与吸光度之间遵从朗伯比尔定律 ,表观摩尔吸光系数为 1 .85× 1 0 4 L·mol-1·cm-1,检测限为 0 .1 μg mL。试验了pH、放置时间、加热时间、干扰离子等对测定的影响。本法可用于注射液中多巴胺含量的测定 ,与药典规定方法对照 ,结果吻合。     

测定N—亚硝基化合物的分光光度法

利用Ｎ－亚硝基化合物的化学去亚硝基反应，建立了一种间接测定Ｎ－亚硝基化合物的分光光度法。实验结果表明，Ｎ－二苯基亚硝胺在０．２￣９．０ｍｇ／Ｌ浓度内呈线性关系。该法应用于香烟烟丝及侧流烟雾萃取液的分析，４次测定ＲＳＤ及回收率分别为１．８６％￣６．３２％，８６．２％￣９６．６％；３．０１％￣５．０３％，１０１．１％￣１０９．１％。     

动力学分光光度法测定微量草酸的研究

本文详细讨论了草酸对锡－苯基荧光酮－溴化十六烷基三甲基铵三元络合物显色反应的催化动力学条件，建立了动力学光度法测定微量草酸的新方法，本法Ｓａｎｄｅｌｌ灵敏度为７．４ｎｇ／ｃｍ＾２，草酸浓度在０－１．０μｇ／ｍＬ范围有良好线性关系，方法可直接用于菠菜中草酸含量的测定。     

猪去氧胆酸化学 II: 熊去氧胆酸的合成

本文报导了一个经过六步把猪胆酸甲酯转化成3,7-双酮-5β-胆烷酸甲酯的方法,总得率38%, 后者可用已知方法还原成熊去氧胆酸。     

薄层树脂相吸光光度法测定痕量铁的研究

本文提出了利用薄层树脂相通过光度法测定痕量铁的新方法。铁离子与硫氰酸钾形成红色络合物，将其富集在Ｈ＋型００１×７阳离子交换树脂上，通过制作成薄层直接测定。本法装皿容易，选择性好，用于天然水和化学试剂中痕量铁的测定，结果满意。     

STUDY ON THE DETERMINATION OF TRACE Fe(Ⅲ) BY THIN LAYER RESIN PHASE SPECTROPHOTOMETRY

A method to determine Fe(Ⅲ) by thin layer resin phase spectrophotometry has been developed in this paper. The colored complex formed by Fe(Ⅲ) and 1,2-benzendiol is concentrated on the 717# resin, then Fe(Ⅲ) can be determined directly by making thin layer. The method is sensitive with a apparent molar absorption of 4.8×104L/mol. cm, which is 16 times higher than that of liquid phase spectrophotometry, most coexisting ions do not influence the determination. The detection limit for Fe(Ⅲ) is 1.47μg/L with the precision of 3.3% [n=6, 7μg/50mL Fe(Ⅲ)]. The calibration curve is linear in the range of 0～25μg/50mL. The preposed method was applied to the determination of Fe(Ⅲ) in water sample with satisfactory results.     

STUDY ON THE DETERMINATION OF TRACE Fe（III） BY THIN LAYER RESIN PHASE SPECTROPHOTOMETRY

A method to determine Fe（Ⅲ） by thin layer resin phase spectrophotometry has been developed in this paper. The colored complex formed by Fe（Ⅲ） and 1,2-benzendiol is concentrated on the 717^# resin, then Fe（Ⅲ） can be determined directly by making thin layer. The method is sensitive with a apparent molar absorption of 4.8×10^4L/mol.cm, which is 16 times higher than that of liquid phase spectrophotornetry, most coexisting ions do not influence the determination. The detection limit for Fe（Ⅲ） is 1.47μg/L with the precision of 3.3% [n=6, 7μg/50mL Fe（Ⅲ）]. The calibration curve is linear in the range of 0-25μg/50mL. The preposed method was applied to the determination of Fe（Ⅲ） in water sample with satisfactory results.     

用紫外光度法测定扑草净粉剂中扑草净含量的研究

扑草净（ｐｒｏｍｅｔｒｙｎｅ）化学名为２,４－二异丙氨基－６－甲疏基－均三嗪,是一种常用的除草剂,具有毒性低,选择性好的特点,目前己用于多种作物的杂草防治。扑草净的定量测定常用气相色谱法和电位滴定法。由于电位滴定法操作麻烦、结果不准确,色谱法又因仪器设备价格较贵而使用有限。寻找简易、快速的扑草净测定具有重要意义。我们根据扑草净在紫外光区２２１ｎｍ处有特征吸收峰的性质,建立了一种用紫外分光光度法测定扑草净的新方法,方法用于农药扑草净粉剂中扑草净含量的测定,结果令人满意。１实验部分１．１主要仪器和试…     

STUDY ON DETERMINATION OF TRACE Fe BY Fe（Ⅱ）-VA THIN LAYER RESIN PHASE SPECTROPHOTOMETRY

A new method for the determination of Fe by thin layer resin phase spectrophotometry in alkali condition was reported. The complex anion formed by Fe(Ⅱ) and VA was absorbed on the 717#resin and Fe was determined by making thin layer. This method had a high sensitivity (ε620=3.0×105 L/mol·cm), which was 15 times higher than that of liquid phase spectrophotometry. It had been proved a satisfactory precision (5.0μg Fe, n=6, RSD=1.8%). The trace Fe in natural water was determined and the recovery was 97%.     

分光光度法测定水中微量汞

以巯基棉分离富集、用分光光度法测定水中微量汞。汞与溴化钠和罗丹明B形成水溶性离子缔合物,该缔合物在532nm处有最大吸收。汞浓度在0～0.16mg/L范围内符合比尔定律,摩尔吸光系数为8.76×10~5L/(mol·cm),该方法的回收率为99％～102％。     

STUDY ON DETERMINATION OF TRACE Cu（Ⅱ） BY DDCT CHELATING RESIN PRECONCENTRATION AND THIN LAYER RESIN PHASE SPECTROPHOTOMETRY

A new method for determination of Cu(Ⅱ) by DDCT chelating resin preconcentration and thin layer resin phase spectrophotometry was developed. The method has a high sensitivity (ε435 =3.6×105 L/mol· cm), which is 33 times higher than that of liquid phase spectrophotometry. It has a good selectivity (most coexisting ions could not influence determination) and an ideal precision [30μg Cu(Ⅱ), n=6, RSD= 1.67%]. The content of Cu(Ⅱ) in water, high purity rare earth and its oxide was determined. The detection limit of Cu(Ⅱ) is 5.3μg/L, and the linear range is 0～7.2 μg/ml. The result is satisfactory.     

分光光度法测定食品中的微量镉

探讨在聚乙烯醇存在下，镉（Ⅱ）-碘化钾-罗丹明B分光光度法测定食品中微量镉的可行性，讨论了影响测定结果的因素，确定了最佳反应条件。镉浓度在0-1.5μg/25mL范围内符合比尔定律，镉的回收率为95%-105%。     

一阶导数吸光光度法同时测定纯硅中铁和铝的研究

提出了用一阶导数光光度法同时测定铁和铝的方法，在ｐＨ６．５乙二胺缓冲溶液中，乳化剂ＯＰ存在下，Ｆｅ＾３＋Ａｌ＾３＋与络天青Ｓ形成Ｆｅ＾３＋，Ａｌ＾３＋－ＣＡＳ－ＯＰ三元络合物，络合物一阶导数光谱等吸收点分别在６０６．２，６３８．０ｎｍ记录混合体系在两波长处一阶导数数值可以分别测定铝，铁含量，互不影响，铁，铝含量分别在１．０～１６μｇ／２５ｍｌ，０．３～１０μｇ／２５ｍｌ范围内呈良好线性，用于测定纯