一阶导数催化动力学分光光度法测定饮用水中的铁

本文利用Ｆｅ＾＋离子催化过氧化氢氧化二苯胺磺酸钠的反应，将获得的动力学曲线转换成一阶导数曲线，根据导数峰高值与Ｆｅ＾＋离子浓度的线性关系测定自来水中的铁含量。本方法的线性范围为０．０２０－０．２００μｍ／ｍＬ Ｆｅ＾３＋，相对标准偏差小于５％，标准加入回收率为１０２％，检出限为０．００５０８μｇ／ｍＬ Ｆｅ＾３＋。对照实验结果表明，导数动力学法比普通非导数动力学法具有线性关系好，线性范围宽，检出限     

烟草中Fe,Co一阶导数分光光度法同时测定的研究

本文研究了在ｐＨ４．０时，ｍｅｓｏ－四（４－磺酸基苯基）卟啉与铁、钴同时络合显色的反应条件以及一阶导数光谱行为。此体系一阶导数的灵敏度比零阶导数灵敏度高。Ｆｅ￣（３＋）～０．１８μｇ／ｍＬ、Ｃｏ￣（２＋）０～０．２４μｇ／ｍｌ，范围内符合比耳定律；检测限为：Ｆｅ￣（３＋）＝０．４８ｎｇ／ｍＬ，Ｃｏ￣（２＋）＝０．２ｎｇ／ｍＬ。回收率为：Ｆｅ９８．５％～１００．８％，Ｃｏ９９．２％～１０１．３％。此方法用于烟草中痕量Ｆｅ、Ｃｏ测定，与ＡＡＳ值相比较，结果令人满意。     

新催化动力学光度法测定痕量铝

根据ＡＩ＾３对ＫＢｒＯ３氧化Ｂａｎｇ花青褪色的催化行为,建立了测定痕量铝的催化动力学动力学分析方法。本法线性范围为０～１６０ｎｇ．ｍＬ＾－１,检出限为１．０ｎｇ．ｍＬ＾－１。除Ｃｕ＾２＋、Ｆｅ＾３＋、Ｃｒ（Ⅵ）外,其余离子均不影响测定。Ｆｅ＾３＋和Ｃｕ＾２＋、Ｃｒ（Ⅵ）的干扰可分别有效消除。测定了人发、茶叶和不中的,加标回收率为９８．４％～１０２％,ＲＳＤ为１．３％～２．１％（ｎ＝６）。     

一阶导数吸光光度法同时测定纯硅中铁和铝的研究

提出了用一阶导数光光度法同时测定铁和铝的方法，在ｐＨ６．５乙二胺缓冲溶液中，乳化剂ＯＰ存在下，Ｆｅ＾３＋Ａｌ＾３＋与络天青Ｓ形成Ｆｅ＾３＋，Ａｌ＾３＋－ＣＡＳ－ＯＰ三元络合物，络合物一阶导数光谱等吸收点分别在６０６．２，６３８．０ｎｍ记录混合体系在两波长处一阶导数数值可以分别测定铝，铁含量，互不影响，铁，铝含量分别在１．０～１６μｇ／２５ｍｌ，０．３～１０μｇ／２５ｍｌ范围内呈良好线性，用于测定纯     

催化动力学垂直光路光度法测定痕量铜

建立了痕量铜的催化动力学垂直光路光度测定法，铜含量在０～３．０ｎｇ／２５０μｌ范围内符合比耳定律，工作曲线的回归方程为：△Ａ＝０．５３４Ｃ（ｃｕ＾２＋，ｎｇ），＋０．０１８（ｒ＝０．９９９９），检出限为１．５×１０＾－１１ｇ．ｍｌ＾－１（△Ａ＝０．０２，ｔ＝２ｍｉｎ）由曲线斜率法求得的表观摩尔吸光系数为１．２×１０＾７，方法用于氮三乙酸及标准水样中铜的测定，加标回收率在９２％～９８％，相对标准偏差     

间接紫外光度法测定食品添加剂乳酸亚铁中Fe^3^＋含量

基于Ｆｅ＾３＾＋能将抗坏血酸量氧化的特性，通过测定反庆前后体在紫外区２４５ｎｍ处吸光度值的差值，间接测定样品中Ｆｅ＾３＾＋的含量。试验结果表明，Ｆｅ＾３＾＋含量在０－２００μｇ／２５ｍＬ范围内服从比耳定律。应用于乳酸亚铁样品中Ｆｅ＾３＾＋含量的测定，回收率为９７．３％－１０１．７％，相对标准偏差为０．８％－２．７％。测定结果与标准方法基本一致。     

吡嗪—2,3—二羧酸体系导数荧光法同时测定铕,铽

研究了以吡嗪－２，３－二羧酸为荧光试剂应用导数荧光技术同时测定Ｅｕ＾３＋，Ｔｂ＾３＋的最佳条件，共存离子的影响和Ｅｕ＾３＋，Ｔｂ＾３＋－ＰＹＤＡ配合物的配合比，稳定常数及光机理，Ｅｕ＾３＋，Ｔｂ＾３＋的检测限分别达４．０和２．０ｎｇ／ｍＬ，利用本方法成功地测定了稀土试样中铕、铽的含量。     

单扫示波极谱法测定溴离子

在０．４５ｍｏｌ·Ｌ＾－１硝酸底液中,用单扫示波极谱仪,阳极化扫描,导数档,溴离子于＋０．１４Ｖ产生一尖锐、灵敏的极谱波。检出限为２μｇ·ｍｌ＾－１,工作曲线由２．４￣１０μｇ·ｍｌ＾－１及１０￣２０μｇ·ｍｌ＾－１两条不同斜率的直线组成,前者灵敏度是近者的两倍。常见阳离子Ｆ＾－、ＳＯ４＾２－、ＢｒＯ＾－３、ＮＯ３＾－不干扰Ｂｂ＾－的测定,用此法测定长江水、溴酸钾中的微量溴离子,回收率为１０７％和     

催化荧光法测定痕量铁的研究

本利用Ｆｅ（Ⅲ）与四乙撑五胺协同催化过氧化氢氧化还原型二氯荧光素的反应，提出了测定痕量Ｆｅ（Ⅲ）的新催化荧光方法。方法的线性范围为０．０１－０．３０μｇ／２５ｍｌ，检出限为１．３×１０＾－＾１＾０ｇ／ｍｌ，常见离子不干扰测定。用于人发，指甲，血清和面粉中痕量铁的测定，回收率为９７％－１０４％。     

催化动力学光度法测定药物和饮用水中痕量铁的研究

本文利用Ｆｅ＾３＋＋对Ｈ２Ｏ２氧化二苯胺碘酸的反应具有催化作用，且在一定条件下显色反应的速度与催化剂Ｆｅ＾３＋的含量成正比的原理，建立了一种痕量铁的分析方法。本文方法的线性范围为０．００８－０．０６４ｍｇ＝Ｌ，相对标准偏差小于５．０％，标准加入回收率为１０１％－１０３％，检出限为０．００６７３ｍｇ／Ｌ。     

2-(5-羧基-1,3,4-三氮唑偶氮)-5-二乙氨基苯甲酸-过氧化氢催化动力学光度法测定痕量铁的研究

研究了铁(Ⅲ)催化H2O2氧化2-(5-羧基-1,3,4-三氮唑偶氮)-5-二乙氨基苯甲酸(CTZDBA)的褪色反应及其动力学条件,褪色反应程度与铁(Ⅲ)量在一定范围内呈线性关系,建立了测定痕量铁(Ⅲ)的催化动力学光度法。在pH4.0的HAc-NaAc缓冲溶液介质中,褪色体系的最大吸收波长581nm,Fe(Ⅲ)的质量浓度在0.0008～0.04μg/mL范围内符合线性关系,回归方程为ΔA=25.325ρ-8.02×10-3(ρ:μg/mL),相关系数为0.9977,检出限3.78×10-10g/mL,方法用于头发和面粉中痕量铁的测定,结果与AAS测定结果相符。     

流动注射光纤荧光探针动力学法测定铁的研究

研究了8-苯胺基-1-萘磺酸作为表面活性剂胶束荧光探针的性质,并将其用作动力学分析的荧光指示剂。建立了以铁(Ⅲ)催化过氧化氢氧化ANS-Brij35体系荧光猝灭反应为基础,用流动注射和光导纤维技术测定痕量铁的动力学分析新方法。该法线性范围为5～300ng/mL,检测下限为2ng/mL,绝对检出量为0.2ng,对20ng/mL铁(Ⅲ)进行11次测定相对标准偏差为0.27%,可直接用于人发、纯铝和铝合金中铁的测定。     

催化荧光法测定痕量锰

本文拟定了一个催化荧光测定痕量锰的新方法。方法检出限为0.0180ng/ml。线性范围为0.04～1.00 ng/ml。直接用于头发、人尿、鱼、水样中锰的测定。回收率为96％～103％,获得满意结果。     

Derivative hydride generation atomic absorption spectrometry and determination of lead traces in waters

Fundamentals of derivative hydride-generation atomic absorption spectrometry (DHGAAS) are described. A linear relationship was obtained between the derivative absorbance and the concentration of analysis in a sample. The new DHGAAS method was applied to the determination of traces of lead in water. The conditions affecting the derivative absorbance of lead were evaluated and optimized. The detection limit and sensitivity of the proposed method were 26 times and 8.8 times better, respectively, than those of conventional hydride-genera-tion atomic absorption spectrometry. The characteristic concentration (for a derivative absorbance of 0.0044) and detection limit (3sigma) for lead were 0.017 and 0.096 ng mL(-1), respectively, for a 2 mV min(-1) sensitivity range setting. The recovery range was 92.5-103%.     

Kinetic Spectrophotometric Determination of Nitrite with Tropaeolin 00-Bromate System

A simple accurate kinetic spectrophotometric method was developed for the determination of nitrite based on its catalytic effect on the redox reaction between tropaeolin 00 and bromate in acid medium. Nitrite was determined by measuring the decrease in the absorbance of tropaeolin 00 at 530 nm by a fixed time method, after 30 s from the initiation of the reaction. The calibration graph was linear in the range 6–500 ng mL^?1 of nitrite and the detection limit was 2 ng mL^?1. The proposed method is selective and is useful for the determination of nitrite in drinking water samples.     

Determination of perfluorooctanoate and perfluorooctanesulfonate in water matrices by inline matrix elimination liquid chromatography with reversed phase separation and suppressed conductivity detection

This work describes a new method for the determination of perfluorooctanoate (PFOA) and perfluorooctane sulfonate (PFOS) in water matrices by suppressed conductivity detection. Separation was achieved by isocratic elution on a reversed-phase column thermostated at 45°C using an aqueous mobile phase containing boric acid and acetonitrile. The PFOA and PFOS content in the water matrix were quantified by a pre-concentration technique. For the concentration range of 1 to 15 ng/mL and 2 to 30 ng/mL, the linear calibration curve for PFOA and PFOS yielded coefficients of determination (R(2)) of 0.9995 and 0.9985, respectively. The relative standard deviations were smaller than 1.5% for PFOA and PFOS. The retention-time precision of four consecutive 12 h injections was smaller than 0.641% and 0.818%, respectively. The presence of common divalent cations, such as calcium, magnesium, and iron in water matrices impairs PFOS recovery. This drawback was overcome by applying inline matrix elimination method. The optimized method was successfully applied for drinking water, ground water, and seawater samples.     

Kinetic spectrophotometric determination of traces of iron(II)

A simple method for the selective and sensitive kinetic spectrophotometric determination of iron (II) is described. The method is based on the oxidation reaction of reduced phenolphthalein by periodate in alkaline media. The change in absorbance was measured using the fixed time method. The effect of different variables on the reaction was investigated and optimum conditions were obtained. The calibration curve was linear in the range 50–3000 ng/mL, and a detection limit of 17 ng/mL was obtained. The relative standard deviation of ten replicate determinations of 200 ng/mL of Fe(II) was 1.2%. The determination of Fe(II) in the presence of a 50-fold amount of Fe(III) could be carried out. This article was submitted by the authors in English.     

铜(Ⅱ)催化PHA的褪色反应特性及应用

本文研究了铜(Ⅱ)催化抗坏血酸还原多卤代变色酸双偶氮胂类试剂(PHA)的褪色反应特性, 讨论了试剂结构对褪色反应动力学特性的影响, 探讨了反应机机。以三氯偶氮胂为代表, 拟定了测定痕量铜(Ⅱ)的新方法, 其检出限为3.06×10^-^1^2g/mL, 线性范围为0~28ng/10mL。用于生物材料中痕量铜(Ⅱ)的测定, 结果满意。     

Integrated retention/spectrophotometric detection in flow-injection analysis : Determination of Iron in Water and Wine

An integrated retention/spectrophotometric method is proposed for the determination of iron based on the Fe (III)-thiocyanate complex. The method has good selectivity, with a determination limit of 10 ng ml^?1 and a linear range of 10–400 ng ml^?1. Different types of measurements (peak height, absorbance increment, tangent curve) are shown to have their particular advantages. The method is applied to the determination of iron in natural water and wine, with an average recovery of 100.3% and 98.8% and an average deviation of the recovery of 2.5% and 1.6%, respectively.     

高效液相色谱法测定生活饮用水中的苯并[a]芘

建立高效液相色谱二极管阵列检测器检测生活饮用水苯并[a]芘的测定方法。采用C18反相色谱柱(150mm×4.6 mm,5μm),在流动相为甲醇–水(体积比为90∶10)、流量1.0 mL/min、检测波长295 nm、柱温35℃、进样体积20μL的条件下测定生活饮用水中苯并[a]芘。该方法检出限为6 ng/L,线性范围0～100 ng/mL,加标回收率为88.1%～93.4%,测定结果的相对标准偏差为1.06%(n=9)。该法样品预处理简单,分离度高,分析时间短,适用于生活饮用水中苯并[a]芘的准确定性定量测定。