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化学发光法测定微量铁 总被引:2,自引:0,他引:2
本文利用Fe(Ⅱ)对Cr(Ⅵ)-KⅠ反应的催化作用和Ⅰ2-鲁米诺化学发光反应,建立了测定微量铁的新方法。提出了测定的最佳条件,检出限为5.6×10(-11)g·ml(-1)的铁,线性范围1.0×10(-10)~1.0×10(-8)g·ml(-1)的铁。用于自来水和工业盐酸中铁的测定,结果满意。 相似文献
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报道了过氧化氢氧化对品红、催化光度法测定锅炉给水中痕量总铁的方法, 测定线性范围为 Fe3+ 0~06μg·50 m l- 1 , 检出限为43×10- 10 g·m l- 1 。 相似文献
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在pH值为3的NH3.H2O-NH4Cl介质中,镧,铈,镨与偶氮胂Ⅲ(ASAⅢ)形成配合物,并于-0.71V(vs.SCE)处产生灵敏的配合物吸附波峰电流与镧,铈,镨浓度分别为3.6×10^-8~1.4×10^-6mol/L,1.8×10^-8~8.6×10^-7mol/L,3.5×10^-8~7.0×10^-7mol/L范围内呈线性关系,测得镧与偶氮胂Ⅲ的配合比为1:1。稳定常数为4.5×10^ 相似文献
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报道了过氧化氢氧化对品红、催人工法测定锅炉给水中痕量总铁的方法,测定线性范围为Fe^3+-~0.6μg.50ml^-1,检出限为4.3×10^-10g.ml^-1。 相似文献
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催化动力学光度法测定痕量银(Ⅰ)的研究 总被引:4,自引:0,他引:4
基于在稀氨水溶液介质中,过硫酸钾与溴甲酚紫的氧化还原反应受银(Ⅰ)催化而使吸光度降低。提示了一种测定痕量银的新方法,在实验确定的最佳条件下,方法的摩尔吸光系数为1.86×10^6L·mol^-1·cm^-1,检出限为9.82×10^1-g·mL^-1,测定的线性范围为0 ̄0.8μg·25.5mL^-1。本方法已用于多各种类型水样、高纯物质和生物物料中痕量银的测定,结果令人满意。 相似文献
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介绍了荧光高分子近年来在理论研究中与作为一种新型功能材料在实际中的应用研究进展。在理论研究中 ,它主要是以荧光探针技术来研究聚合物的微相动力学和构象 ,聚合物相转移和聚集行为 ,聚合物能量转移及光聚合过程。它作为功能材料 ,主要用于荧光化学传感器、非线性光学装置中 ,以及用作光导树脂等材料。 相似文献
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Liwei Yan Chunjiao Su Linghong Shen Mingqian Lv Cheng Liu Xuan Liu Guangsheng Liu Jialing Li Zhongbin Ye 《应用聚合物科学杂志》2019,136(7):47062
A water-soluble fluorescent copolymer poly(acrylamide-acrylic acid-styrene pyridinium) (PAAS) for detecting polymer concentration in real time was synthesized via micellar free-radical polymerization by acrylamide, acrylic acid, and styryl-pyridinium salt derivative (SP- 4 ). The special Donor-π-Acceptor unit and ionic structure of SP- 4 endued the copolymer with excellent fluorescent properties and remarkable water solubility. The fluorescent copolymer was fully characterized by Fourier transform infrared, 1H nuclear magnetic resonance, thermogravimetry, Ubbelohde viscosity, ultraviolet–visible spectroscopy, and fluorescence measurements. Furthermore, the fluorescence intensity and the concentration of PAAS were verified to have ideal linear relationship with a correlation coefficient up to 0.9993, indicating that the copolymer's concentration can be easily measured by detecting its fluorescence intensity. Most importantly, the introduction of water-soluble fluorescent monomer SP- 4 endowed the PAAS with good fluorescent stability in a wide range of temperature, pH, and brine concentrations. This study demonstrated that the fluorescent copolymer PAAS exhibits great potential application in detecting polymer concentration in various environments. © 2018 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136, 47062. 相似文献
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水溶性共轭聚合物具有良好的光电性质和良好的水溶性,在传感器方面表现出诱人的应用前景,因此近年来关于它们的研究备受瞩目。本文主要概述近年来以水溶性共轭聚合物为基础的荧光传感器在金属离子、小分子以及生物大分子检测方面的应用进展。 相似文献
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N-Phenylmaleimide derivatives bearing a chiral oxazoline substituent at the benzene ring (N-[o-(4,5-dihydro-1,3-oxazol-2-yl)phenyl]maleimides, OPMIs) were polymerized using a binary initiating system composed of Et2Zn and n-BuLi to in situ produce the zinc complexes of optically active poly(OPMI)s. The significant changes in chiroptical and fluorescent properties were observed for these polymers upon complexation with metal ions due to the formation of supramolecular structure, evidenced by circular dichroism, fluorescence spectrum and atomic force microscopy. The fluorescence spectra of poly(OPMI)/ZnII complexes in the presence of (R)/(S)-1,1′-bi-2-naphthol (BINOL) and (R)/(S)-2-amino-1-propanol were studied in THF media. It was found that the fluorescence intensity of the complexes responded differently to both enantiomers of BINOL and the amino alcohol in a quenching and enhancement fashion, respectively. Furthermore, the enantioselective fluorescence response was strongly dependent on the amount of incorporated zinc in polymer matrices. 相似文献
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以天然生物基材料蓖麻油(CO)、柠檬酸(CA)和L-半胱氨酸(L-Cys)或L-丝氨酸(L-Ser)为原料,合成一系列生物基可降解荧光聚酯(BBPP-Cys、BBPP-Ser)。采用FTIR、~1HNMR、紫外-可见光谱和荧光光谱对其结构和荧光特性进行表征。同时,测量了聚酯的水接触角、粒径大小、力学性能、降解性能以及细胞毒性。研究结果表明,悬挂在聚酯主链上独特六元环状结构是其产生荧光特性的原因。BBPP-Cys在265 nm处有最强紫外吸收,在445 nm处有最强荧光发射;BBPP-Ser在266 nm处有最强紫外吸收,在460 nm处有最强荧光发射。所合成聚酯具有良好的亲水性和较小粒径,拉伸强度范围为1.21~1.95 MPa,在0.1 mol/L NaOH溶液中7 d降解率达到60%以上。采用MTT法对荧光聚酯进行细胞毒性实验的结果表明,细胞增殖率均大于90%,证明其具有良好的生物相容性。 相似文献
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设计合成含2-硫代海因的小分子对照物1和聚苯撑乙炔poly(1)。通过一系列阴离子的正四丁基铵盐的DMSO溶液来评价聚合物的阴离子识别性能。加入F-后,poly(1)的DMSO溶液荧光淬灭;然而,加入Cl-,Br-,HSO-4,NO-3和CH3CO-2后,poly(1)溶液荧光不变,说明poly(1)对氟离子有荧光识别能力。Poly(1)对F-的Stern-Volmer淬灭常数为7.09×104M-1,相应地,对照物1对F-的Stern-Volmer淬灭常数为5.10×102M-1,说明了poly(1)具有增强淬灭效应。 相似文献