催化荧光光度法测定痕量铁（Ⅲ）

基于痕量铁（Ⅲ）在稀硫酸溶液中对过氧化氢氧化靛蓝胭脂红的催化褪色作用,建立了催化荧光光度法测定痕量铁（Ⅲ）的新方法。方法的线性范围为0．7～80ng·mL^-1检出限为2．96×10^-1g·L^-1。回收率为98．37％～101．56％。该法用于自来水中痕量铁（Ⅲ）的测定,结果令人满意。     

催化动力学光度法测定痕量铁(Ⅲ)──铁(Ⅲ)-甲基紫-过氧化氢体系

本文研究了硫酸介质中，铁（Ⅲ）催化过氧化氢氧化甲基紫的褪色反应，建立了分光光度法直接测定痕量铁（Ⅲ）的新方法，其灵敏度为4．0×10(-9)g·ml(-1)，测定铁（Ⅲ）的范围为0～0．70μg／25ml。方法简便、快速，分析费用低，可用于水样中痕量铁（Ⅲ）的测定。     

催化光度法测定食品中的痕量铁

本文研究了铁（Ⅲ）对过氧化氢氧化劳氏青莲退色反应的催化作用及其动力学条件,从而建立了痕量铁（Ⅲ）的催化光度法,检出限为１．８×１０－９ｇ·ｍＬ－１。用本法测定食品中的痕量铁,结果令人满意。     

硫堇-I3^-PVA共振瑞利散射法测定环境水样中痕量砷（Ⅲ）

建立了一种测定环境水中痕量砷的共振瑞利散射（RRS）新方法。在pH=5．6的HAc—NaAc缓冲溶液中,I3^-与硫堇在聚乙烯醇（PVA）存在时能生成稳定的离子缔合物,体系共振瑞利散射增强。当加人微量As（Ⅲ）时,碘能定量氧化As（m）,导致共振瑞利散射减弱,在0．05—12．0μg／25mL浓度范围内,共振瑞利散射强度的改变值△IRRS与As（Ⅲ）浓度呈线性关系,方法检出限为0．92μg/L。用于环境水样中痕量As（Ⅲ）的测定,结果令人满意。     

邻二氮菲显色树脂相光度法同时测定水中Fe（Ⅲ）和Fe（Ⅱ）

在ｐＨ４．００～７．００ 条件下，同一溶液中Ｆｅ（Ⅲ）、Ｆｅ（Ⅱ）与邻二氮菲生成有色配合物，用７３２＃ 强酸性阳离子树脂交换吸附，进行树脂相光度法同时测定痕量Ｆｅ（Ⅲ）和Ｆｅ（Ⅱ）。结果表明，在５１０ｎｍ 处测得的吸光度可测定Ｆｅ（Ⅱ），在４００ｎｍ 处测得的吸光度可测定Ｆｅ（Ⅲ）＋ Ｆｅ（Ⅱ）。该法用于测定自来水和六次甲基四胺样品中的Ｆｅ（Ⅲ）和Ｆｅ（Ⅱ），结果令人满意。     

溴氯酚蓝催化动力学光度法测定痕量铁

本文研究了在硫酸介质中，铁（Ⅲ）催化过氧化氢氧化溴氯酚蓝而使其褪色的反应，建立了一种催化动力学光度法测定痕量铁的新方法。本方法的测定范围为０～２．１μｇ／２５ｍｌ，检出限为４．１×１０－１０ｇ／ｍｌ，用于水样及人发样品中痕量铁（Ⅲ）的测定，相对标准偏差小于５．５％，加标回收率为９２～１０８％。     

在混合表面活性剂存在下,银盐光度法测定黄磷中的痕量砷

银盐光度法测砷是基于在酸性溶液中，碘化钾和氯化亚锡将Ａｓ（Ⅴ）还原为Ａｓ（Ⅲ），加锌粒与酸作用，产生新生态氢，使Ａｓ（Ⅲ）进一步还原为砷化氢，再以硝酸—硝酸银—聚乙烯醇—乳化剂ＯＰ—乙醇为吸收显色液来测定黄磷中的痕量砷，该方法操作简便，灵敏度较高，用于黄磷中砷的分析，结果满意。     

分光光度法测定环境水样中痕量铁(Ⅲ)

报道了在曲通Ｘ－１００存在下，含有０．１０ｍｏｌ／Ｌ硫酸溶液中的铁（Ⅲ）与结晶紫和硫氰酸钾形成可溶性离子缔合物，该缔合物的表观摩尔吸光系数为１．０６×１０６Ｌ·ｍｏｌ－１ｃｍ－１，本显色体系铁（Ⅲ）的浓度在０．００８～０．０９２ｍｇ·Ｌ－１范围内符合比耳定率。本法可快速测定环境水样中痕量铁（Ⅲ）。     

2-[(对硝基苯基)偶氮]桑色素的合成及其与铁(Ⅲ)显色反应的研究

研究合成了新试剂２－［（对硝基苯基）偶氮］桑色素，并对其理化性质、分析特性等作了鉴定。系统地研究了该试剂与铁（Ⅲ）显色反应的最佳条件。拟定了测定人发中痕量铁的分光光度法，结果满意。     

苯并噻唑偶氮苯类试剂的分光光度法的应用

自８０年代以来,共合成了苯并噻唑偶氮苯类试剂近５０种,在环保废水测定、合金中痕量元素测定等应用效果满意。苯并噻唑偶氮苯类试剂可与Ｃｏ（Ⅱ）、Ｃｕ（Ⅱ）、Ｆｅ（Ⅱ）、Ｆｅ（Ⅲ）、Ｎｉ（Ⅱ）、Ｐｄ（Ⅱ）等多种离子发生配位显色反应。在表面活性剂或有机溶剂存在下,具有较高的灵敏度和选择性,在分析领域得到广泛应用,具有实际意义。     

Aluminum,Arsenic, Beryllium,Cadmium, Chromium,Cobalt, Copper,Iron, Lead,Mercury, Molybdenum,Nickel, Platinum,Thallium, Titanium,Vanadium, and Zinc: Molecular Aspects in Experimental Liver Injury

Experimental liver injury with hepatocelluar necrosis and abnormal liver tests is caused by exposure to heavy metals (HMs) like aluminum, arsenic, beryllium, cadmium, chromium, cobalt, copper, iron, lead, mercury, molybdenum, nickel, platinum, thallium, titanium, vanadium, and zinc. As pollutants, HMs disturb the ecosystem, and as these substances are toxic, they may affect the health of humans and animals. HMs are not biodegradable and may be deposited preferentially in the liver. The use of animal models can help identify molecular and mechanistic steps leading to the injury. HMs commonly initiate hepatocellular overproduction of ROS (reactive oxygen species) due to oxidative stress, resulting in covalent binding of radicals to macromolecular proteins or lipids existing in membranes of subcellular organelles. Liver injury is facilitated by iron via the Fenton reaction, providing ROS, and is triggered if protective antioxidant systems are exhausted. Ferroptosis syn pyroptosis was recently introduced as mechanistic concept in explanations of nickel (Ni) liver injury. NiCl₂ causes increased iron deposition in the liver, upregulation of cyclooxygenase 2 (COX-2) protein and mRNA expression levels, downregulation of glutathione eroxidase 4 (GPX4), ferritin heavy chain 1 (FTH1), nuclear receptor coactivator 4 (NCOA4) protein, and mRNA expression levels. Nickel may cause hepatic injury through mitochondrial damage and ferroptosis, defined as mechanism of iron-dependent cell death, similar to glutamate-induced excitotoxicity but likely distinct from apoptosis, necrosis, and autophagy. Under discussion were additional mechanistic concepts of hepatocellular uptake and biliary excretion of mercury in exposed animals. For instance, the organic anion transporter 3 (Oat3) and the multidrug resistance-associated protein 2 (Mrp2) were involved in the hepatic handling of mercury. Mercury treatment modified the expression of Mrp2 and Oat3 as assessed by immunoblotting, partially explaining its impaired biliary excretion. Concomitantly, a decrease in Oat3 abundance in the hepatocyte plasma membranes was observed that limits the hepatic uptake of mercury ions. Most importantly and shown for the first time in liver injury caused by HMs, titanium changed the diversity of gut microbiota and modified their metabolic functions, leading to increased generation of lipopolysaccharides (LPS). As endotoxins, LPS may trigger and perpetuate the liver injury at the level of gut-liver. In sum, mechanistic and molecular steps of experimental liver injury due to HM administration are complex, with ROS as the key promotional compound. However, additional concepts such as iron used in the Fenton reaction, ferroptosis, modification of transporter systems, and endotoxins derived from diversity of intestinal bacteria at the gut-liver level merit further consideration.     

THERMOPLASTIC,FLEXIBLE, AND RECYCLABLE COMPOSITES,DESIGN, PREPARATION,AND CHARACTERIZATION

Glass fiber reinforced composites based on thermosets are the traditional materials used for many applications due to their good mechanical properties. The non-recyclability of these materials has led to the necessity to develop thermoplastic composites and industrial processes for their manufacture [1]. The present paper deals with the preparation of thermoplastic pre-pregs unidirectionally reinforced with Twarn® and their mechanical characterization.     

DUO-ICP-AES测定精对苯二甲酸中的钴、铬、铁、锰、钼、镍、钛

采用DUO-ICP-AES同时测定精对苯二甲酸中钴、铬、铁、锰、钼、镍、钛,并对仪器的分析线选择、背景校正、入射功率、雾化器压力、辅助气流量、冷却气流量、蠕动泵转速的影响及共存元素的干扰、硝酸铯灰化助剂等因素进行了详细的研究。方法的检测限:钴0.0097 mg/L;铬0.0021 mg/L;铁0.0078 mg/L;锰0.0012 mg/L;钼0.0027 mg/L;镍0.016 mg/L;钛0.0027 mg/L,回收率和精密度分别为93.0%～99.5%和0.37%～3.2%。该方法快速简便,具有良好的精密度和准确度,适用于进出口精对苯二甲酸的日常检验。     

Pd-, Ni-, Fe-, and Co-Catalyzed Cross-Couplings Using Functionalized Zn-, Mg-, Fe-, and In-Organometallics

The development of new methods for preparing polyfunctional organometallics has made a broad range of such reagents available for various transition metal-catalyzed cross-couplings. An overview of the most general preparation methods will be presented. Applications to practical cross-coupling procedures will be covered, emphasizing the functional group compatibility and the reaction scope.     

Sylvatraxx树脂对半钢子午线轮胎胎面胶性能的影响

本文研究了Arizona Chemical公司生产的胎面增强助剂（Tread Enhancement Additive-TEA）Sylvatraxx 4401对半钢子午线轮胎胎面胶性能的影响。结果表明：Sylvatraxx 4401的加入有利于提高白炭黑的分散性,改善混炼胶的加工性能和硫化胶的物理机械性能,能够明显提高胎面的抗湿滑性。随着Sylvatraxx 4401用量的增加,白炭黑在胶料中的分散进一步提高,混炼胶的门尼粘度降低;硫化胶的压缩生热和阿克隆磨耗降低,0oC的tanδ明显提高的同时60oC的tanδ略微降低,有利于胎面胶抗湿滑性能的提高和滚动阻力、动态生热的降低。