对硝基偶氮氯膦(CPApN)与镧络合物的分光光度法研究

铬变酸的不对称双偶氮衍生物是稀土元素的灵敏显色剂。如间乙酰基偶氮氯膦、间羧基偶氮氯膦、间硝基偶氮氯膦、对硝基偶氮氯膦、间磺酸基偶氮氯膦、对(间)甲酰基偶氮氯膦、对碘偶氮氯膦、氨基C酸偶氮氯膦等,已分别用于稀土总量、铈组稀土、钇等的光度测定。对硝基偶氮氯膦在酸性溶液中呈紫红色,与稀土离子生成蓝色的络合物。它不仅在酸性介质中能与铈组稀土发生α型的反应,而且与钇还发生特征的β型反应。据此曾拟定了在钇的存在下测定铈组稀土和在铈组存     

间磺酸基偶氮氯膦用作光度测定钍的试剂

含有一个分析功能团的一类不对称的变色酸双偶氮衍生物是稀土的灵敏显色剂。如间羧基偶氮氯膦、间乙酰基偶氮氯膦、间硝基偶氮氯膦、对硝基偶氮氯膦、间(或对)甲酰基偶氮氯膦、间磺酸基偶氮氯膦等,已分别用于稀土总量、铈组稀土和钇的光度测定。我们进一步研究了此类试剂与钍、铀、铈的反应情况,发现在较高的酸度下,此类试剂中的间磺酸偶氮氯膦,不仅与钍有较灵敏的反应,而且对铀和铈的反应能力显著减弱,是一种灵敏度高、选择性较好的光度测定钍的新试剂。     

偶氮氯膦——一类新型的有机分析试剂

一、前言1961年罗金(А.М.Лукин)等试验合成了在有机分子中含有下列分析官能团的一类新化合物,定名偶氮氯膦(Хлорфосфоназо)。其中偶氮氯膦Ⅰ用作光度测定钿,偶氮氯膦Ⅲ用作光度测定铀(Ⅵ)、镎(Ⅴ)、镤(Ⅴ)、钛、锆、钍、钪和钚(Ⅳ),以及偶氮氯膦R用作光度测定铍。     

两种钙离子络合显色剂在指纹显现中的应用初探

偶氮氯膦Ⅲ和乙二醛缩双(邻氨基酚)与钙离子的显色反应快速、灵敏,是无机及分析化学中常用的检测微量钙离子含量的方法。考虑到汗潜指纹中含有一定的钙离子,文章尝试利用它们与钙离子的显色反应,快速显现或者"定位"指纹。通过实验得到了适用于显现指纹的偶氮氯膦Ⅲ和乙二醛缩双(邻氨基酚)体系,并且将这些体系试用于指纹显现,已在镀锌板、陶瓷、滤纸等材质上取得了良好效果。     

间(对)甲酰基偶氮氯膦的合成及其与稀土元素显色反应的研究

变色酸双偶氮衍生物是一类重要的显色剂,常用于稀土、碱土和铀钍的测定。自偶氮胂M和偶氮硝羧合成以后,不对称变色酸双偶氮衍生物的研究与应用发展很快。1974年,我们合成了甲酰基、乙酰基、丙酰基偶氮羧等不对称变色酸双偶氮衍生物。实验证明,甲酰基、乙酰基和丙酰基是有效的功能团。本文介绍将甲酰基引进偶氮氯膦类试剂以后所得到的间(对)甲酰基偶氮氯膦Ⅰ对甲酰基偶氮氯膦 2-(4-氯-2-膦酸基苯偶氮)-7-(4-甲酰基苯偶氮)-1,8-二羟基萘-3,6-二磺酸Ⅱ间甲酰基偶氮氯膦 2-(4-氯-2-膦酸基苯偶氮)-7-(3-甲酰基苯偶氮)-1,8-二羟基-3,6-二磺酸     

对(间)氨磺酰基偶氮氯膦的合成及其应用

氨磺酰基—SO_2NH_2属于吸电子功能基,具有很好的亲水性能,因此我们将其引入偶氮膦类变色酸双偶氮衍生物,获得对氨磺酰基偶氮氯膦(Ⅰ)和间氨磺酰基偶氮氯膦(Ⅱ)两种新显色剂: (Ⅰ)4-SO_1NH_2对氮磺酰基偶氮氯膦 (Ⅱ)3-SO_2NH_2间氨磺酰基偶氮氯膦本文用试剂磺胺经重氮化与偶合反应(与偶氮氯膦Ⅰ偶合)得到化合物(Ⅰ)。合成化合物(Ⅱ)需先制得间氨基苯磺酰胺,我们参照文献[1]经以下步骤合成了该化合物:     

间磺酸基偶氮氯膦光度法测定四元碳酸盐中的钪

介绍了用间磺酸基偶氮氯膦测定碳酸盐中钪的方法。在０．１８～０．４８ｍｏｌ／Ｌ盐酸介质中，钪与试剂形成蓝色的化合物。在６７０ｎｍ波长处是有最大吸收峰，摩尔吸光系数４．６×１０４，钪是在０～４５μｇ／５０ｍＬ范围内符合比耳定律。经预先有机萃取分离，该法可满意地应用于碳酸盐中微量钪的测定。     

用正丁醇萃取纯化偶氮氯膦Ⅲ

偶氮氯膦Ⅲ属于变色酸的双偶氮衍生物,是继偶氮胂Ⅲ之后,于1961年合成并应用于光度分析的。目前已报导的是可用于铀、稀土、钍、镎、钚、镤、钛、钙、镁、钡、锶、钪、锆、锌等十多种元素的光度测定。在国内主要是用它测定铀和稀土元素。偶氮氯膦Ⅲ比偶氮胂Ⅲ能在更强的酸性溶液中与铀和稀土发生显色反应,故选择性较高,在适宜的掩蔽剂存在下,可不需分离进行直接测定。如目前已广泛采用偶氮氯膦Ⅲ直接测定钢铁中的稀土总量,方法快速准确。因此偶氮氯膦Ⅲ是一种具有重     

KBrO3氧化间乙酰基偶氮氯膦动力学光度法测定痕量钒

研究了在H3PO4介质中,钒(V)对KBO3氧化间乙酰基偶氮氯膦褪色反应的催化作用,测定了体系的动力学性质,拟定了反应的最佳条件,建立了测定痕量钒的新方法。该方法是用固定时间法在530nm波长处监测化学反应,方法的线性范围为0~9.0×1-0 8g.mL-1,检出限为2.8×1-0 10g.mL-1,在NH4F及尿素存在下,大多数常见离子无干扰。可用于钢样中微量钒的直接测定。     

偶氮氯膦-mA与铀~Ⅵ显色反应的研究

上海师范大学等单位合成的偶氮氯膦-mA是测定稀土的高灵敏显色剂。实验证明,在弱酸性介质中偶氮氯膦-mA与铀~Ⅵ也产生显色反应,且反应的灵敏度较高,选择性也较好。本文研究了偶氮氯膦-mA与铀~Ⅵ显色反应的条件及所形成络合物的性质。研究表明,铀~Ⅵ—偶氮氯膦-mA络合物形成的最佳酸度为pH3.0～5.0。络合物的组成     

Many Drugs of Abuse May Be Acutely Transformed to Dopamine,Norepinephrine and Epinephrine In Vivo

It is well established that a wide range of drugs of abuse acutely boost the signaling of the sympathetic nervous system and the hypothalamic–pituitary–adrenal (HPA) axis, where norepinephrine and epinephrine are major output molecules. This stimulatory effect is accompanied by such symptoms as elevated heart rate and blood pressure, more rapid breathing, increased body temperature and sweating, and pupillary dilation, as well as the intoxicating or euphoric subjective properties of the drug. While many drugs of abuse are thought to achieve their intoxicating effects by modulating the monoaminergic neurotransmitter systems (i.e., serotonin, norepinephrine, dopamine) by binding to these receptors or otherwise affecting their synaptic signaling, this paper puts forth the hypothesis that many of these drugs are actually acutely converted to catecholamines (dopamine, norepinephrine, epinephrine) in vivo, in addition to transformation to their known metabolites. In this manner, a range of stimulants, opioids, and psychedelics (as well as alcohol) may partially achieve their intoxicating properties, as well as side effects, due to this putative transformation to catecholamines. If this hypothesis is correct, it would alter our understanding of the basic biosynthetic pathways for generating these important signaling molecules, while also modifying our view of the neural substrates underlying substance abuse and dependence, including psychological stress-induced relapse. Importantly, there is a direct way to test the overarching hypothesis: administer (either centrally or peripherally) stable isotope versions of these drugs to model organisms such as rodents (or even to humans) and then use liquid chromatography-mass spectrometry to determine if the labeled drug is converted to labeled catecholamines in brain, blood plasma, or urine samples.     

Sapindaceae,cyanolipids, and bugs

Scentless plant bugs (Heteroptera: Rhopalidae) are so named because adults of the Serinethinae have vestigial metathoracic scent glands. Serinethines are seed predators of Sapindales, especially Sapindaceae that produce toxic cyanolipids. In two serinethine species whose ranges extend into the southern United States,Jadera haematoloma andJ. sanguinolenta, sequestration of host cyanolipids as glucosides renders these gregarious, aposematic insects unpalatable to a variety of predators. The blood glucoside profile and cyanogenesis ofJadera varies depending on the cyanolipid chemistry of hosts, and adults and larvae fed golden rain tree seeds (Koelreuteria paniculata) excrete the volatile lactone, 4-methyl-2(5H)-furanone, to which they are attracted.Jadera fed balloon vine seeds (Cardiospermum spp.) do not excrete the attractive lactone. Loss of the usual heteropteran defensive glands in serinethines may have coevolved with host specificity on toxic plants, and the orientation ofJadera to a volatile excretory product could be an adaptive response to save time.Mention of a commercial product does not consititute an endorsement by the USDA.     

Insect antifeedant properties of anthranoids from the genusVismia

Vismiones and ferruginins, representatives of a new class of lypophilic anthranoids from the genusVismia were found to inhibit feeding in larvae of species ofSpodoptera, Heliothis, and inLocusta migratoria.     

2008～2009年世界塑料工业进展

收集了2008年7月～2009年6月世界塑料工业的相关资料,介绍了2008～2009年国外塑料工业的发展情况,提供了世界塑料产量、消费量及全球各类树脂的需求量及产能情况。按通用热塑性树脂(聚乙烯、聚丙烯、聚苯乙烯、聚氯乙烯、ABS树脂)、工程塑料(尼龙、聚碳酸酯、聚甲醛、热塑性聚酯、聚苯醚)、特种工程塑料(聚苯硫醚、液晶聚合物、聚醚醚酮)、通用热固性树脂(酚醛、聚氨酯、环氧树脂、不饱和聚酯树脂)不同品种的顺序,对树脂的产量、消费量、供需状况及合成工艺、产品应用开发、树脂品种的延伸及应用的进一步扩展等技术作了详细介绍。     

ICP-MS法测定地球化学样品中As、Cr、Ge、V等18种微量痕量元素的研究

建立了测定地球化学样品中包括As、Cr、Ge、V等18种微量、痕量元素的ICP-MS方法。地化试样用HF-HNO3混酸分解后,以1 1 HNO3溶解干渣。由于制样不使用盐酸,避免了Cl对As、Cr、Ge、V的质谱干扰。用国家一级地球化学标准物质GBW 07309制备溶液优化仪器工作参数,并用于校准。方法测定限(6s)为:0.007~6.4μg/g,精密度(RSD%,n=12)为:29%~9.4%,经过国家一级地球化学标准物质的分析验证,结果与标准值吻合。方法已应用于国土资源调查的试样分析。