玫瑰精B光度法测定苯唑西林的含量

在pH=9.13的Tris-HCl缓冲体系中,玫瑰精B可与苯唑西林反应生成浅粉红色离子缔合物,产生两个明显的褪色峰.其最大褪色波长分别位于578 nm和494nm,表观摩尔吸光系数(ε)分别为8.70×104L/(mol·cm)和5.20×104L/(mol·cm).苯唑西林的浓度在0～0.6 mg/L范围内与溶液的褪...     

超高灵敏显色反应及其应用的研究：Ⅴ.高灵敏光度法测定钼

研究了以Cu~(2 )为催化剂的Mo(V)-SCN~--ERB~ -PVA超高灵敏新显色体系及钼的分光光度测定条件。缔合物的吸收峰在580nm处,表观摩尔吸光系数ε=5.6×10~6L·mol~(-1)·cm~(-1)。Mo(Ⅵ)含量在0～0.3μg/25mL范围内符合比耳定律。初步研讨了显色反应的机理。结合离子交换分离,本法可成功地用于水样及麦饭石浸出液中痕量钼的测定。     

超高灵敏显色反应的理论和实践

本文系统评述了我国在ε≥１＊１０＾６Ｌ．ｍｏｌ＾－１．ｃｍ＾－１的超高灵敏显色反应的理论和实践，总结了规律和发展趋势。文献１２７篇。     

阿莫西林与玫瑰精B的共振瑞利散射光谱及应用

利用共振瑞利散射法测定阿莫西林的含量.在pH=9.5～9.9的Tris-HCl緩冲溶液中,阿莫西林和玫瑰精B作用后,共振瑞利散射显著增强,在306～378 nm波长范围内呈现高的散射强度,并以340和372 nm波长处的△IRRS最强.阿莫西林的质量浓度在0～0.4μg/mL范围内与△IRRS呈正比,据此建立了测定阿莫...     

超高灵敏显色反应及其应用的研究——Ⅳ.生命活性元素锌的高灵敏光度法

本文研究了Zn~(2+)-SCN~--RB~+-PVA_(124)超高灵敏显色体系及锌的分光光度测定条件。缔合物的吸收峰在607nm处,表观摩尔吸光系数达2.6×10~6L·mol~(-1)·cm~(-1)。Zn~(2+)浓度在0～0.5μg/25ml范围内符合比耳定律。测得缔合物的组成比Zn~(2+):RB~(+)为1:30。初步研讨了显色反应的机理。方法有较好的选择性,可不经预分离,成功地用于水样,麦饭石浸出液、花粉和发样中痕量锌的测定。     

测定痕量硅的超高灵敏显色反应的研究

本文详细研究了在阿拉伯树胶存在下,硅钒钼蓝-罗丹明B水相光度法测定硅的新方法.四元络合物的最大吸收峰在595nm处,表观摩尔吸光系数为1.0×10~6·L·mol~(-1)·cm~(-1),Sandell灵敏度为2.25×10~(-5)μgSi/cm~2。硅含量在0～0.7μg/25mL范围内遵守比尔定律。方法用于水中痕量硅的测定,结果令人满意。     

超高灵敏显色反应及其应用的研究 Ⅱ.汞(Ⅱ)-乙基罗丹明 B-碘化物体系

本文研究了在聚乙烯醇-124存在下,汞(Ⅱ)-乙基罗丹明B_碘化物超高灵敏显色体系及其反应机理。缔合物λ_(max)=605nm,表观摩尔吸光系数ε_(605nm)=1.14×10~6L.mol~(-1).cm~(-1)。汞(Ⅱ)浓度在0—2.5μg/25ml时符合比耳定律。方法可用于水样及地球化学标样中痕量汞的测定。     

曲利本蓝-氨基糖苷类抗生素的显色反应及其分析应用

曲利本蓝 (TB)与硫酸卡那霉素 (KANA)和硫酸妥布霉素 (TOB)等氨基糖苷类抗生素在pH 2 .0～ 7.0的条件下反应生成蓝色离子缔合物。其最大显色波长位于 680nm(TOB)和 686nm(KANA) ,线性范围分别是 0～ 1 1 .0 μg mL(TOB)和0～ 1 3.0 μg mL(KANA) ,摩尔吸光系数 (ε)分别为 5 .32× 1 0 3(TOB)和 3.64× 1 0 3(KANA)L·mol-1·cm-1;最大褪色波长位于 5 88nm(TOB)和 5 90nm(KANA) ,线性范围均为 0～ 1 1 .0 μg mL ,摩尔吸光系数 (ε)分别为 1 .84× 1 0 4 (TOB)和 1 .1 1× 1 0 4(KANA)L·mol-1·cm-1。当用双波长叠加法时 ,ε值分别为 2 .37× 1 0 4 (TOB)和1 47× 1 0 4 (KANA)L·mol-1·cm-1。探讨了适宜的反应条件及主要的分析化学性质。该方法用于市售药物中氨基糖苷类抗生素的测定。     

Micelle-mediated cloud point extraction and spectrophotometric determination of rhodamine B using Triton X-100

A new micelle-mediated cloud point extraction method is described for sensitive and selective determination of trace amounts of rhodamine B by spectrophotometry. The method is based on the cloud point extraction of rhodamine B from aqueous solution using Triton X-100 in acidic media. The extracted surfactant rich phase is diluted with water and its absorbance is measured at 563 nm by a spectophotometer. The effects of different operating parameters such as concentration of surfactant and salt, temperature and pH on the cloud point extraction of rhodamine B were studied in details and a set of optimum conditions were obtained. Under optimum conditions a linear calibration graph in the range of 5-550 ng mL⁻¹ of rhodamine B in the initial solution with r = 0.9991 (n = 15) was obtained. Detection limit based on three times the standard deviation of the blank (3S_b) was 1.3 ng mL⁻¹ (n = 10) and the relative standard deviation (R.S.D.) for 50 and 350 ng mL⁻¹ of rhodamine B was 2.40 and 0.87% (n = 10), respectively. The method was applied for the determination of rhodamine B in soft pastel, hand washing liquid soap, matches tip and textile dyes mixture samples.     

超声波辅助萃取－高效液相色谱法测定食品中碱性玫瑰精

建立超声波辅助萃取—高效液相色谱法测定含辣椒食品中非法添加剂碱性玫瑰精的方法.样品经均质,辣椒面样品、辣椒油样品、红油豆瓣酱样品分别用乙腈:水=7:3(V/V)溶液、正己烷:50％乙醇=1:2(V/V)溶液、无水乙醇经超声波辅助萃取后,用高效液相色谱仪测定碱性玫瑰精.线性范围0.026～26 μg/mL,相关系数0.9...     

离子缔合物-萃取荧光光度法测定水中阴离子表面活性剂

在 0 .2 5 mol/L H2 SO4 溶液中 ,罗丹明 B与阴离子表面活性剂形成离子缔合物 ,氯仿萃取后 ,于 5 5 0 nm处激发 ,荧光波长为 60 0 nm,对于十二烷基硫酸钠的线性范围为 0 .0 2 5～ 0 .4mg/L,RSD<2 .6%。方法可用于河水及生活废水中 1 0 -7～ 1 0 -6mol/L 阴离子表面活性剂的测定     

电化学法研究罗丹明B与壳聚糖的相互作用

用电化学方法研究了罗丹明B与壳聚糖(CS)的相互作用,在pH 3.0的NaAc-HAc缓冲溶液中,罗丹明B在-0.67 V(vs.SCE)处有一个灵敏的线性扫描二阶导数极谱波,当加入一定量的CS后,反应体系的电化学信号发生变化,结果表明,罗丹明B与壳聚糖可形成结合物,结合物的峰电流在一定范围内与壳聚糖的浓度成正比,因而可用于测定壳聚糖的含量.此外,实验还探讨了罗丹明B与壳聚糖的最大结合数,为进一步研究有机染料与多糖的结合提供了理论基础.     

Kinetic studies of the polymerization of an epoxy resin modified with rhodamine B

Novel fluorescent materials were satisfactorily synthesized. With this aim, an epoxy resin based on diglycidyl ether of bisphenol A (DGEBA) was reacted with a laser dye, rhodamine B (RB), to achieve an epoxy-based prepolymer. Then, a diamine, m-xylylenediamine (MXDA), was used as hardener with the purpose of obtaining a crosslinked polymer. The curing conditions strongly influence the intended final properties and the optimization of the curing requires a reliable kinetic model. For that reason, this work presents the kinetic study of the polymerization of the epoxy resin by differential scanning calorimetry (DSC) in isothermal mode as well as by Fourier transform infrared spectroscopy (FTIR). DSC data were fitted using a Kamal autocatalytic equation. Conversion as a function of reaction time curves obtained by means of both techniques agreed well. In addition, the synthesized epoxy-based materials were characterized by proton nuclear magnetic resonance spectroscopy (¹H NMR) and their fluorescent properties were also analysed.     

铑（Ⅲ）－钼酸盐－罗丹明B显色体系的研究和应用

在聚乙烯醇（ＰＶＡ）存在下，铑（Ⅲ）与钼酸盐和罗丹明Ｂ（ＲＢ）形成离子缔合物，缔合物的最大吸收位于５８０ｎｍ，摩尔吸光系数ε值１．６８×１０５Ｌ·ｍｏｌ－１·ｃｍ－１，服从比耳定律范围０～１０μｇＲｈ／２５ｍＬ，方法用于催化剂和冶金产品中铑的测定，结果满意     

Highly sensitive and selective reversible sensor for the detection of Cr

A new fluorescent sensor capable of sensing Cr³⁺ has been synthesized. Complexing with Cr³⁺ triggers the formation of a highly fluorescent ring-open form which is pink in color. The sensor shows extremely high fluorescence enhancement upon complexation with Cr³⁺ and it can be used as a ‘naked eye’ sensor. Binding of Cr³⁺ was found to be reversible as the pink color disappears with excess EDTA.     

铑-钨酸盐-罗丹明B缔合显色反应的研究及应用

在聚乙烯醇 (PVA)存在下 ,铑 ( )与钨酸盐及罗丹明 B(RB)形成的离子缔合物在 570 nm处产生最大吸收。建立了测定铑 ( )的光度分析方法 ,其表观摩尔吸光系数 ε达 1 0 7(L·mol-1·cm-1)数量级。方法的检测范围为 0～ 50ng/2 5m L ,检出下限为 0 .2 9ng/2 5m L。大量存在的常见离子对 Rh( )的测定不干扰。用此方法测定了催化剂及工业产品中铑的含量 ,结果与标准方法 (Sn Cl2法 )一致。