鲁米诺化学发光熄灭法测定铕

研究了Ｅｕ（Ⅲ）对Ｌｕｍｉｎｏｌ－Ｈ２Ｏ２－Ｃｒ（Ⅲ）体系化学发光的熄灭效应,在此基础上建立了铕的流动注射化学发光分析法。分析灵敏度高,线性范围宽,仪器设备简单,操作方便。     

KMnO_4-鲁米诺体系测定苯唑西林钠

基于苯唑西林钠对碱性介质中KMnO4-鲁米诺体系化学发光的增强作用,建立了流动注射化学发光法测定苯唑西林钠的新方法.在最佳的实验务件下,苯唑西林钠的质量浓度与化学发光强度成正比,线性范围为0.01～20μg/mL,检出限(3σ)为1.0 ng/mL,对1.0μg/mL苯唑西林钠进行了11次平行测定,其相对标准偏差为2.4%.     

KIO4-鲁米诺化学发光体系测定青霉素钠

在碱性介质中,KIO4氧化鲁米诺产生化学发光,青霉素钠对该体系有增强作用.在最佳的实验条件下,青霉素钠浓度与增强的发光强度成正比,线性范围为0.01～20μg/mL,检出限(3σ)为3.0 ng/mL,对1.0μg/nL青霉素钠进行11次平行测定,其相对标准偏差为1.2%.方法已用于粉针剂、合成样品及尿样中青霉素钠的测定.     

流动注射化学发光法测定盐酸仑氨西林

盐酸仑氨西林(lenampicillin hydrochloride)是新一代广谱口服半合成青霉素类抗菌素,测定盐酸仑氨西林的方法有紫外分光光度法[1],高效液相色谱法[2-4]。光度法灵敏度都不高,高效液相色谱法仪器昂贵且操作烦琐。利用流动注射化学发光分析法测定盐酸仑氨西林,尚未见报道。本文研     

鲁米诺-过氧化氢体系流动注射化学发光法测定痕量钌

1　引　　言钌是贵金属之一 ,在地壳中的平均含量很低 ,即使富集在某些矿床中 ,其实际含量也不高。因此 ,测定时要求采用高灵敏度的测定方法和特效的分离富集技术。目前多采用光度法 ,如催化光度法、荧光光度法等。化学发光分析法具有很高的灵敏度。曾报道有Luminol 溴酸钠 羟基化学发光体系测定痕量钌 ,Luminol Tritonx 10 0 Ru化学发光体系测定微量钌等都获得了成功。流动注射化学发光法具有样品与反应剂的混合过程 ,化学发光的反应过程以及检测过程都在流动体系中连续进行的特点 ,实现了在线检测。采用微型锥形柱 ,以VS Ⅱ型阴离子…     

美洛西林钠的电化学行为与测定

用线性扫描伏安法、循环伏安法研究了美洛西林钠的电化学行为;在0.2mol／LKCl-0.001mol／LHCl底液中,美洛西林钠在滴汞电极上有一灵敏的还原峰(峰电位-0.7V),峰电流与扫描速度成正比,方法的线性范围为5.0×10-4～1.0×10-2g／L,检出限为1.0×10-4g／L;方法可直接用于美洛西林钠样品的测定。     

鲁米诺化学发光抑制法测定阿洛酮糖

建立一种流动注射化学发光测定阿洛酮糖的方法。基于碱性条件下,阿洛酮糖对鲁米诺-H₂O₂体系的发光强度具有显著的抑制作用,且发光信号的降低值(即相对发光强度)ΔI与阿洛酮糖浓度的对数在一定范围内成线性关系,建立了一种流动注射化学发光法测定阿洛酮糖的新方法。在最佳实验条件下,方法的线性范围为在0.002 mg·mL^-1～2.0 mg·mL^-1(R=0.9977),方法的检出限为4.3×10^-4 mg·mL^-1,对0.05 mg·mL^-1的阿洛酮糖连续测定11次,其相对标准偏差为3.1%。该方法用于果冻中阿洛酮糖含量的测定,与高效液相色谱法测得结果基本一致。     

鲁米诺-过氧化氢体系流动注射化学发光法测定维生素B4

维生素B4(VB4),又名磷酸腺嘌呤。它是核酸的组成成分,在体内参与RNA和DNA的合成。传统测定嘌呤类的方法是利用其在260 nm附近有最大吸收的性质,用紫外分光光度法定量[1],但此方法灵敏度不高。已报道的测定维生素B4的方法还有磷光法[2]、高效液相色谱法[3]、极谱法[4]、伏安法[5     

鲁米诺-铁氰化钾流动注射化学发光法测定头孢拉定

在碱性介质中,铁氰化钾氧化鲁米诺产生化学发光,头孢拉定对该体系有显著的增强作用。基于此并结合流动注射技术建立了测定头孢拉定含量的化学发光新方法。该法线性范围为0.16~160 mg/L,检出限为0.028 mg/L;对80 mg/L的头孢拉定进行平行测定11次,其相对标准偏差为0.99%。用本法对胶囊中头孢拉定进行测定,并初步探讨了该化学发光的反应机理。     

鲁米诺-铁氰化钾化学发光体系测定双嘧达莫

在碱性条件下,铁氰化钾氧化鲁米诺产生化学发光,双嘧达莫对该体系的化学发光有显著的增强作用。基于此并结合流动注射技术建立了测定双嘧达莫的新方法。该方法检出限为5.7×10-11g mL(IUPAC),线性范围为1.0×10-10～5.0×10-8g mL,对5.0×10-9g mL双嘧达莫平行测定11次,其相对标准偏差为1.9%。     

AuCl4--鲁米诺体系测定阿莫西林钠的含量

在NaOH介质中,AuCl4-氧化鲁米诺产生化学发光,阿莫西林钠显著增强该体系的发光,据此建立了测定阿莫西林钠的流动注射化学发光新方法.在优化的实验条件下,测定阿莫西林钠的线性范围为0.01～15 μg/mL,检出限为2.6 ng/mL,对1.0 μg/mL阿莫西林钠进行了11次平行测定,其相对标准偏差为1.7%.本法已用于针剂及血清中阿莫西林钠的测定.     

化学发光法测定氨苄西林钠

在NaOH介质中,KI04氧化鲁米诺产生化学发光,氨苄西林钠显著增强该体系的发光.据此,建立了一种简单、快速测定氨苄西林钠的流动注射化学发光新方法.在优化的实验条件下,线性范围为0.01～10 μg/mL,检出限为3.0 ng/mL,对1.0 μg/mL氨苄西林钠进行了11次平行测定,其相对标准偏差为1.4%.已用于粉针剂、合成样品及尿样中氨苄西林钠的测定.     

Chemiluminescence system for automatic determination of chemical oxygen demand using flow injection analysis

A novel chemiluminescence (CL) system for automatic determination of chemical oxygen demand (COD) combined with flow injection analysis is proposed in this paper. In this system, potassium permanganate is reduced to Mn²⁺ which is first adsorbed on a strongly acid cation-exchange resin mini-column to be concentrated during chemical oxidation of the organic compounds at room temperature, while the excessive MnO₄⁻ passes through the mini-column to be waste, then the concentrated Mn²⁺ is eluted reversely and measured by the luminol-H₂O₂ CL system. The calibration graph is linear in the range of 4-4000 mg l⁻¹ and the detection limit is 2 mg l⁻¹. A complete analysis could be performed in 1.5 min including washing and sampling, giving a throughout of about 40 h⁻¹. The relative standard deviation was 4.4% for 10 mg l⁻¹ COD (n=11), 4.8% for 100 mg l⁻¹ COD (n=11). This CL flow system for determination of COD is very simple, rapid and suitable for automatic and continuous analysis. The presented system has been applied successfully to the determination of COD of water samples.     

Chemiluminescence determination of carbofuran at trace levels in lettuce and waters by flow-injection analysis

A simple, fast chemiluminescence (CL) flow-injection (FI) method based on the reaction of luminol with KMnO₄ in alkaline medium has been described for the direct determination of carbofuran. The method is based on the enhancing effect in the emission light from the oxidation of luminol produced in presence of carbofuran. The optimisation of instrumental and chemical variables influencing the CL response of the method has been carried out by applying experimental design, using the proposed flow-injection manifold. Under the optimal conditions, the CL intensity was linear for a carbofuran concentration over the range of 0.06-0.5 μg ml⁻¹, with a detection limit of 0.02 μg ml⁻¹. The method has been successfully applied to the determination of carbofuran residues in spiked water and lettuce samples.     

化学发光新体系测定盐酸洛美沙星

在碱性条件下盐酸洛美沙星对Luminol KIO4 钙黄绿素发光体系有强烈的抑制作用。据此建立了流动注射化学发光抑制法测定盐酸洛美沙星的新方法。该方法的线性范围为1 0～20mg L,检出限(3σ)为0 30mg L,相对标准偏差(n=10,ρ=5.0mg L)为0 9%。已用于胶囊中盐酸洛美沙星的测定,回收率为95%～106%。     

流动注射化学发光灵敏测定阿洛西林

基于阿洛西林对Luminol-KIO4化学发光体系的抑制作用,提出了一种流动注射-化学发光测定阿洛西林的快速、灵敏的新方法.在优化条件下,阿洛西林的线性范围是5.0×10-8～1.0×10-5 mol/L,检出限为3.1×10-8 mol/L.对1.0×10-7 mol/L阿洛西林进行11次测定,相对标准偏差为1.7％...     

Chemiluminescence determination of ferulic acid by flow-injection analysis using cerium(IV) sensitized by rhodamine 6G

A simple, sensitive and rapid flow-injection chemiluminescence method has been developed for the determination of ferulic acid based on the chemiluminescence reaction of ferulic acid with rhodamine 6G and ceric sulfate in sulphuric acid medium. Strong chemiluminescence signal was observed when ferulic acid was injected into the acidic ceric sulfate solution in a flow-cell. The present method allowed the determination of ferulic acid in the concentration range of 8.0x10(-6) to 1.0x10(-4)moll(-1) and the detection limit for ferulic acid was 8.7x10(-9)moll(-1). The relative standard deviation was 2.4% for 10 replicate analyses of 1.0x10(-5)moll(-1) ferulic acid. The proposed method was applied to the determination of ferulic acid in Taita Beauty Essence samples with satisfactory results.     

流动注射化学发光抑制法测定氨苄西林钠

基于氨苄西林钠在H2SO4溶液中降解后,其降解产物对桑色素-KMnO4体系的化学发光具有显著的抑制作用,据此建立了流动注射化学发光抑制法快速测定氨苄西林钠的新方法。化学发光信号的降低值△Icl与氨苄西林钠的质量浓度在10．0～100．0mg／L范围内呈良好的线性关系,其中r=0．9995(n=7)。方法的检出限为2．7mg／L,对50．0mg／L氨苄西林钠进行了11次平行测定,方法的相对标准偏差为0．8％。用本法对氨苄西林钠针剂的测定结果符合国家药典要求,回收率为99．1％～102．0％。初步探讨了化学发光反应的抑制机理。