催化动力学流动注射荧光光度法测定微量亚硝酸根

基于亚硝酸根离子在硫酸介质中催化溴酸钾氧化罗央明６Ｇ使其荧光强度降低的反应，建立了快速，灵敏，简便的催化动力学流动注射荧光光度法测定亚硝酸根的新方法。     

溴酸钾-溴甲酚紫催化光度法测定水中痕量亚硝酸根

基于在0．45mol/mL H3PO4中NO2^-对KBrO3氧化溴甲酚紫的催化褪色反应,建立了测定NO2^-的新方法,发现温度仅对反应初速有较大影响,但在10－22min及20－28度范围内ΔA趋于恒定,温度及时间几乎无影响,在反应12min后于434nm测定NO2^- ,线性范围及检测限分别为0．01－0．4mg/L及9ug/L,多数常见离子无干扰,Fe（Ⅲ）可用NaF掩蔽,V（V）及基体干扰可加尿素制备空白样予以扣除。本法简便,灵敏度及选择性较高,用于水中痕量NO2^-的测定,结果满意。     

溴酸钾氧化茜素绿催化光度法测定痕量亚硝酸根

基于酸性介质溴酸钾氧化茜紊绿反应,提出了测定痕量亚硝酸根新的催化光度法.本法的Sandell灵敏度为9.4×10~(-5)μg/cm~2亚硝酸态氮,测定亚硝酸根量的线性范围为0.01～0.12μg/ml,可用于水样中亚硝酸根测定。     

停流流动注射分析同时测定碘离子和亚硝酸根的研究

基于铁（Ⅲ）－硫氰酸根络合物褪色动力学反应，利用流动注射分析停流技术，建立了流动注射动力学分析法同时测定碘离子和亚硝酸根离子的新方法，方法对碘离子的线性范围为２×１０＾－－１．６×１０－４ｍｏｌ／Ｌ，对亚硝酸根的线性范围为４×１０＾－７－１×１０ｍｏｌ／Ｌ。应用于全成混合液中碘离子和亚硝酸根的测定，结果满意。     

动力学催化光度法测定痕量亚硝酸根

磷酸和棉红在１００℃下反应生成天蓝色物质（λｍａｘ＝６７５ｎｍ）,该物质在痕量亚硝酸根的催化下被ＫＢｒＯ３氧化褪色,研究了反应的条件,测定了动力学参数,建立了测定痕量亚硝酸根的方法,方法检出限是４＊１０＾－１０ｇ／ｍＬ,测定范围是０．４０－２０．００μｇ／Ｌ,用于水体中痕量亚硝酸根的测定,结果满意。     

溴酸钾氧化靛红催化光度法测定痕量亚硝酸根

基于磷酸介质中ＮＯ２＾－催化溴酸钾氧化靛红的褪色反应，建立了测定痕量ＮＯ２＾－的新方法，并讨论了其动力学条件。方法检测限为１．３６×１０＾－６ｇ／Ｌ，线性范围０．３￣２μｇ／２５ｍＬ，方法简便，已用于环境水样中痕量ＮＯ２＾－的测定。     

水中亚硝酸根的表面活性剂增敏催化动力学流动注射荧光法测定

研究发现十二烷基硫酸钠对稀磷酸介质中亚硝酸根催化溴酸钾氧化藏红T有显著的增敏作用;据此建立了催化动力学流动注射荧光法测定痕量亚硝酸根的方法,方法检出限为0．2μg／L,线性范围为0．5～25．0μg／L,进样频率为72次／h;该法用于水样中亚硝酸根的测定,结果与标准方法相符。     

Kinetic Spectrophotometric Determination of Trace Amounts of Nitrite Ion Using Its Reaction With Neutral Red

Abstract

A rapid, simple, sensetive and selective method for the determination of trace amounts of nitrite ion(30-800 ng/ml) is developed. It depends on the reaction of nitrite with Neutral Red. The reaction is monitored spectrophotometrically by measuring the decrease in absorbance at 530 nm by a fixed time method. The limit of detection is 14 ng/ml. The method is used for the determination of nitrite ion in waste water.     

流动注射示差动力学分析法提高测定的选择性

本文归纳了流动注射示差动力学分析法所基于的化学反应和常用的流路,评述了流动注射示差动力学分析法在单一组分的高选择性测定和多组分的连续或同时测定中的应用。     

溴酸钾氧化酸性品红催化光度法测定亚硝酸根

研究了在强酸介质中亚硝酸根催化溴钾氧化酸性品红的褪色反应及其动力学条件，建立了高灵敏测定痕量亚硝酸根的新催化光度法。方法灵敏度为３．７×１０＾－１１ｇ／ｃｍ＾２亚硝酸态氮，线性范围为０．０６－０．４２μｇ／１０ｍＬ，用于测定唾液及硝钾中亚硝酸根。     

Catalytic Spectrophotometric Determination of Vanadium by Flow Injection Analysis

Determination of trace amount of vanadium in water was studied by flow injection analysis. Catalytic spectrophotometric detection was performed with bromate oxidation of o-phenylenediamine and by addition of tiron as an activator and also as a masking agent. Vanadium can be determined with sample rate of ca. 60–70 samples/hour with in a range of 0.01 ppm to 0.5 ppm V and with r.s.d. 0.555% for 0.1 ppm V and 0.37% for 0.3 ppm V. Interference by Fe(III) can be reduced by using 0.3% NH₄F as a carrier solution.     

流动注射催化分光光度法测定钌的研究

利用钌（Ⅲ）对过氧化氢氧化还原型百里酚酞显色反应的显著催化作用，建立了钌的新流动注射催化分光光度分析法，该法快速灵敏、简便，用于实际样品分析，结果良好。     

溴酸钾氧化吡口罗红G催化动力学光度法测定痕量NO-2

研究了在磷酸介质中亚硝酸根催化溴酸钾氧化吡口罗红Ｇ而使其褪色，建立了催化动力学光度法测定痕量亚硝酸根的新方法，测定范围为０．２～２０μｇ／ｍＬ，检出限为０．２ｎｇ／ｍＬ，用于食品和水样中的亚硝酸根测定获得满意结果     

Determination of Nitrite by a New Spectrophotometric Method Using Safranin

Abstract

A spectrophotometric method was developed to determine nitrite using safranin as color reagent. The reaction between nitrite and safranin produces a safranin-HNO₂ species, which exhibits absorption peaks at 280, 349, 420(shoulder) and 610 nm. The peak at 610 nm was chosen as the analysis wavelength because nitrite ion and safranin do not present absorption bands in this region. The Lambert-Beer law was obeyed in the concentration range 7.0 × 10^?6 - 5.0 × 10^?5M. The effects of various ions on absorbance of the safranin-HNO₂ species were studied; the nitrite analysis can be performed without interference in the presence of the ions SCN^?, Br^?, CH₃COO^?, Cl^? (≤ 1.0 × 10^?3 M) and NO₃ ^? (< 1.0 × 10^?5 M). The SO₄ ⁼ does not interfere even at a concentration of 0.25M.     

动力学光度法测定甲醛

在室温及酸性条件下,甲醛对溴酸钾氧化乙基橙的反应具有显著的促进作用,量反应具有一定的诱导期。通过测量诱导建立了测定甲醛的动力学分析新方法,测定甲醛的线性范围为０．１０～１．５ｍｇ／Ｌ,检测限为０．０５ｍｇ／Ｌ。利用此法测定了废水中的甲醛,结果满意。     

Flow Injection Spectrophotometric Determination of Iodide in Environmental Samples

 An alternative and simple flow injection spectrophotometric analysis method for the determination of iodide in environmental samples is reported. The method is based on the catalytic destruction of the colour of the Fe(III)–SCN⁻–CP⁺–_nBP_y quarternary complex. The complex shows maximum absorption at 495 nm. The apparent molar absorptivity of the complex in terms of iodide is (6.22) × 10⁵ l mol⁻¹ cm⁻¹. The detection limit of the method is 0.1 ng ml⁻¹ of iodide. The method obeys Beer’s law up to 120 μg l⁻¹ with slope, intercept and correlation coefficient of 0.11, − 0.52 and + 0.99, respectively. Various flow injection analysis parameters for the determination of iodide in the environmental samples were optimized. The sample throughput of the method is 60 samples h⁻¹. The method was successfully useful for the determination of trace level of iodide in environmental samples i.e. ground, surface water. Received November 12, 2001; accepted April 2, 2002; published online July 22, 2002     

Catalytic Kinetic Spectrophotometric Method for Determination of Phosphate Ion

The kinetic method for the determination of phosphate microamounts was described. The developed method is based on catalytic effect of phosphate on sodium pyrogallol-5-sulphonate （PS） by dissolved oxygen. The reaction was followed spectrophotometrically by measuring the rate of change in the values of the absorbance of the oxidation product at 437 nm. The optimum reaction conditions are PS （0.44×10^-3 mol·L^-1） and HClO4 （3.6×10^-6 mol·L^-1） at 25 ℃. Following this procedure, phosphate can be determined with a linear calibration graph up to 0.23 μg·mL^-1. The interference effect of several species was also investigated and it was found that the most common cations and anions did not interfere with the determination. The developed procedure was successfully applied to the determination of phosphate in natural waters and soil.     

动力学分光光度法测定痕量亚硝酸根和硫氰酸根的研究

基于亚硝酸根对溴酸钾氧乙基橙反应的催化作用及硫氰酸根对此反应的抑制作用，建立了动力学光度法测定痕量亚硝酸根和硫氰酸根的新方法，测定亚硝酸根的线性范围为５－１００μｇ／Ｌ，测定硫氰酸根的线性范围为３－１２μｇ／Ｌ，用于湖水和蔬菜中的亚硝酸根量及化学试剂和尿中的硫氰酸根测定，结果满意。