Kalman滤波-流动注射化学发光法同时测定痕量铌和钽的研究

流动注射化学发光（Flow injection-chemiluminescence,简称FI-CL）是基于流动注射（FI）进样技术与化学发光（CL）定量分析结合的痕量分析技术,具有仪器简单、操作方便及易于自动化等特点,从而在分析痕量元素方面取得了较大进展,尤其在痕量金属元素快速分析方面更具有优势.     

流动注射化学发光法测定痕量钯

在NaOH介质中,H_2O_2能氧化鲁米诺(Luminol)产生化学发光,在OP乳化剂存在下,金属钯能催化该反应,据此建立了Luminol-NaOH-H_2O_2-OP-Pd(Ⅱ)化学发光体系,用流动注射化学发光法测定钯,检出限为4.1ng/mL,Pd(Ⅱ)浓度在1.0×10~(-8)～1.0×10~(-6)g/mL范围内与发光强度呈良好的线性关系,相对标准偏差(n=10)为3.8％。     

流动注射化学发光测定乙醛的研究

本文研究了应用Ｇａ（没食子酸）－Ｈ２Ｏ２－ＯＨ＾－化学发光体系，流动注射技术测定乙醛的条件，如反应介质及其ｐＨ值，Ｇａ及Ｈ２Ｏ２溶液的浓度，温度，试液混合次序与化学发光强度的关系等，选择了流动注射系统的若干参数，所拟定的方法测定乙醛的浓度范围为每ｍＬ１．７×１０＾－３～４．４×１０＾－７ｇ，相对标准偏差为１．８％（２×１０＾－５ｇ／ｍＬ，乙醛溶液进行１１次平行测定）检出限为每ｍＬ３．１×１０＾－８     

流动注射化学发光测定水中的苯酚

基于苯酚对鲁米诺－铁氰化钾化学发光体系有增敏作用，建立起测定苯酚的新方法。苯酚浓度在0.01-10mg/L范围内与化学发光强度呈良好的线性关系，标准曲线为△I=307.44C(mg/L)-36.929(n=9,r^2=0.9983），检出限（3σ）为0.004mg/L，对1mg/L的苯酚进行11次平行测定，相对标准偏差（RSD）为1.06%。本法已用于废水中苯酚的测定。     

偶合反应流动注射化学发光测定锆的研究

基于Ｚｒ置换Ｃｏ－ＮＴＡ配合物中的Ｃｏ（Ⅱ）和Ｃｏ（Ⅱ）催化过氧化氢氧化鲁米诺产生化学发光的反应，建立了偶合反应流动注射化学发光测定锆的新方法。方法的线性范围为１×１０＾－１０－１×１０＾－７ｇ．ｍｌ＾－１，检出限为３×１０＾－１１ｇ．ｍｌ＾－１，方法用于地矿术中锆的测定，结果满意。     

无机偶合流动注射化学发光测定钒的研究

基于钒（Ⅳ）对铬（Ⅵ）氧化Ｉ－产生Ｉ２的诱导作用，和Ｉ２氧化鲁米诺产生化学发光的反应，建立了无机偶合反应流动注射化学发光测定痕量钒的新方法。本方法线性范围１×１０－６～１×１０－２ｇ／Ｌ，ＲＳＤ＝２．８％（ｎ＝１１次，ｃ＝８×１０－６ｇ／Ｌ），检出限为７×１０－７ｇ／Ｌ。本法用于水样、人发中钒的测定，结果令人满意。     

流动注射化学发光传感器测定抗坏血酸

基于抗坏血酸抑制ＫＭｎＯ４－鲁米诺体系化光反应这一效应，设计出一种简便，快速，灵敏度高的消耗型化学发光抗坏血酸传感器。该传感器线性响应范围为１．０＊１０＾－５－４．０＊１０＾－３ｇ／Ｌ；相对标准偏差为２．３％（１．０＊１０＾－４ｇ／Ｌ，ｎ＝１１）；     

流动注射化学发光同时测定废水中的三价铬和六价铬

首次将镀铜锌粒作成优良的还原柱，在线还原Ｃｒ（Ⅵ）成Ｃｒ（Ⅲ），以鲁米诺－Ｈ２Ｏ２（ＫＢｒ）体系流动注射化学发光同时测定废水中两种价态的铬。分析速率为６０试样／ｈ；线性范围为１．０×１０＾－５－１．０×１０＾－９ｍｏｌ／Ｌ；测Ｃｒ（Ⅲ）及Ｃｒ（Ⅵ）的相对标准偏差（ｎ＝６）分别为０．３７％－４．０％及１．２％－４．４％；测定Ｃｒ（Ⅲ）的检出限２．３×１０＾－１１ｍｏｌ／Ｌ。测定结果与标准方法无显差     

全固定化试剂流动注射化学发光测定铜

采用离子交换固定法把Ｌｕｍｉｎｏｌ（Ｌｕ），ＣＮ＾－固定在阴离子交换树脂上，串入流动注射系统中，当一定量洗脱剂被注入阴离子交换柱时，洗脱下来的Ｌｕ和ＣＮ＾－与分析物Ｃｕ＾２＋发生化学反应，产生化学发光，实现对Ｃｕ＾２＋的在线检测。本法检出限为１．３×１０＾－９ｇ／ｍＬ，线性范围为４．０×１０＾－９－６．０×１０＾－６ｇ／ｍＬ，ＲＳＤ为３．４％，单次测定在１ｍｉｎ内能完成。已用于井水中铜的测定，结果     

流动注射化学发光法测定DL-酪氨酸

在甲醛存在下 ,高锰酸钾与DL 酪氨酸能够发生化学发光反应 ,产生很强的化学发光。据此采用流动注射技术 ,建立了一种测定DL 酪氨酸的化学发光分析法。方法的检出限为 2 .9× 1 0 - 8g/mL ,相对标准偏差为 1 .5 % ( 1 .0× 1 0 - 6g/mLDL 酪氨酸 ,n =1 1 ) ,线性范围为 1 .0× 1 0 - 7g/mL～ 5 .0× 1 0 - 6g/mL。     

流动注射化学发光法测定褪黑素

在强碱性介质中,铁氰化钾可直接氧化褪黑素产生化学发光。基于此,建立了一种测定褪黑素的流动注射化学发光分析方法。线性范围为1.9×10-6~2.3×10-4g/mL,检出限为5×10-7g/mL,该法已用于药物中褪黑素的测定。     

Sensitive and selective determination of molybdenum by flow injection chemiluminescence method combined with controlled potential electrolysis technique

A sensitive and selective flow injection chemiluminescence (CL) method combined with controlled potential electrolysis technique was described for the determination of molybdenum. The method is based on the chemiluminescence reaction of luminol with unstable molybdenum(III) in alkaline solution. The molybdenum(III) was on-line reduced from molybdenum(VI) via controlled potential electrolysis technique using a homemade flow-through carbon electrolytic cell at the potential of −0.6 V (versus Ag/AgCl). The method allows the determination of molybdenum in the 5.0×10⁻¹⁰ to 5.0×10⁻⁷ g ml⁻¹ range with a limit of detection (3σ) of 5×10⁻¹¹ g ml⁻¹ molybdenum. The relative standard deviation is 2.6% for the 1.0×10⁻⁹ g ml⁻¹ molybdenum solution in 11 repeated measurements. This method was successfully applied to the determination of molybdenum in water samples.     

快速化学发光联用流动注射技术测定西咪替丁

在NaOH-NaHCO3介质中,铁氰化钾氧化西咪替丁产生快速化学发光反应,0.5 s后发光达到最大,2 s后迅速衰减至零。本文结合流动注射技术,建立了一种化学发光测定西咪替丁的新方法。针对这一快速发光反应,设计了与之相应的管路系统和最短的反应管道来捕捉最大化学发光信号,发光强度与西咪替丁质量浓度在5×10-7~1×10-4g/mL范围内呈线性关系,检出限为1.1×10-7g/mL。对5×10-6g/mL西咪替丁进行11次平行测定,相对标准偏差为1.8%。本法已用于西咪替丁片剂的测定。     

流动注射化学发光法测定痕量NO_2~-的研究与应用

Based on the principle of the reaction of NO2-with I-and formation of I2 in HCl solution,and the chemiluminescence(CL) reaction between luminol and I2 in an alkaline medium.A fairly sensitive,simple and rapid flow-injection analysis-chemiluminescence method for the determina-tion of trace nitrite with the luminal-I——NO2-coupling luminescence system has been developed.Experiment conditions of flow-injection analysis are optimized.When satisfying the condition that Luminol as 4.0×10-4 mol/L,0.7 % KI,0.04 mol/...     

Sensitive determination of captopril by flow injection analysis with chemiluminescence detection based on the enhancement of the luminol reaction

This work reports a novel flow injection (FI) method for the determination of captopril, 1-[(2S)-3-mercapto-2-methylpropionyl]-l-proline (CPL), based on the enhancement CPL affords on the chemiluminescence (CL) reaction between luminol and hydrogen peroxide. For this purpose alkaline luminol and hydrogen peroxide solutions were mixed online, the sample containing CPL was injected into an aqueous carrier stream, mixed with the luminol-hydrogen peroxide stream and pumped into a glass flow cell positioned in front of a photomultiplier tube (PMT). The increase in the CL intensity was recorded in the form of FI peaks, the height of which was related to the CPL mass concentration in the sample. Different chemical and instrumental parameters affecting the CL response were investigated. Under the selected conditions, the log-log calibration curve was linear in the range 5-5000 μg l⁻¹ of CPL, the limit of detection was 2 μg l⁻¹ (at the 3σ level), the R.S.D., s_r was 3.1% at the 100 μg l⁻¹ level (n=8) and the sampling rate was 180 injections h⁻¹. The method was applied to the determination of CPL in pharmaceutical formulations with recoveries in the range 100±3%.     

Selective determination of amino acids using flow injection analysis coupled with chemiluminescence detection

The determination of the amino acids proline, histidine, tyrosine, arginine, phenylalanine and tryptophan using flow injection analysis (FIA) with chemiluminescence detection is described. Proline was the only amino acid to exhibit chemiluminescence with the tris(2,2-bipyridyl)ruthenium(III) reaction at pH 10. While, histidine was found to selectively enhance the reaction of luminol with Mn(II) salts in a basic medium. Acidic potassium permanganate chemiluminescence was able to selectively determine tyrosine at pH 6.75. Low pressure separations using a C18 guard column allowed the simultaneous determination of tyrosine and tryptophan or phenylalanine and tryptophan with acidic potassium permanganate and copper(II)-amino acid-hydrogen peroxide chemiluminescence, respectively. Precision for each method was less than 3.9% (R.S.D.) for five replicates of a standard (1×10⁻⁵ M) and the detection limits ranged between 4×10⁻⁹ and 7×10⁻⁶ M. Preliminary investigations revealed that the methodology developed was able to selectively determine the individual amino acids in an equimolar mixture of the 20 naturally occurring amino acids.     

流动注射-化学发光法测定片剂中氨基比林

采用流动注射技术 ,研究了氨基比林 -高锰酸钾 -连二亚硫酸钠体系的化学发光行为。对影响化学发光强度的诸因素进行了实验探讨 ,建立了化学发光法测定片剂中氨基比林的新方法。方法的检出限为 6× 1 0 -8g/m L,线性范围为2 .0× 1 0 -7～ 8.0× 1 0 -5g/m L。对浓度为 4.0× 1 0 -6g/m L的氨基比林的相对标准偏差为 1 .8%     

流动注射化学发光法测定甲硝唑

在碱性条件下 ,铁氰化钾氧化鲁米诺产生化学发光 ,甲硝唑对该体系有显著的增强作用 (亚铁氰化钾存在时 )。基于此 ,建立了流动注射化学发光测定痕量甲硝唑的新方法。甲硝唑浓度在 2 .0× 1 0 -6～ 4 .0× 1 0 -4 mol L范围内与发光强度呈良好的线性关系 ;检出限 (3σ)为 1 .5× 1 0 -7mol L。相对标准偏差 (c =1 .0× 1 0 -5mol L ,n=1 1 )为 3.6 %。方法已用于制剂中甲硝唑含量测定     

流动注射化学发光法测定己烯雌酚

基于己烯雌酚对鲁米诺与高碘酸钾在碱性介质中反应产生的化学发光信号有较强的增敏作用,建立了测定己烯雌酚的流动注射化学发光分析法。己烯雌酚质量浓度在13．4—1340μg／L范围内与化学发光强度呈良好的线性关系,检出限（3d）为4μg／L;对26．8μg／L己烯雌酚进行11次平行测定,相对标准偏差（RSD）为1．4％。该法已用于药物制剂中己烯雌酚的测定。