Determination of Trace Vanadium（V）in Seawater and Fresh Water by the Catalytic Kinetic Spectrophotometric Method     

JI Hongwei  SHA Yuanyuan  XIN Huizhen  LI Shuang 《青岛海洋大学学报(英文版)》2010,(4):343-349

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Determination of trace vanadium (V) in seawater and fresh water by the catalytic kinetic spectrophotometric method     

Hongwei Ji  Yuanyuan Sha  Huizhen Xin  Shuang Li 《中国海洋大学学报(英文版)》2010,9(4):343-349

A new kinetic spectrophotometric method has been developed for the determination of vanadium (V). The method is based on the catalytic effect of vanadium (V) on the oxidation of weak acid brilliant blue dye (RAWL) by KBrO₃ using the citric acid as activation reagent. The obtained optimum conditions are: c (RAWL) = 1×10⁻⁴ molL⁻¹, c (KBrO₃) = 3×10⁻² molL⁻¹, c (citric acid) = 9×10⁻³ molL⁻¹, pH = 2.50, the reaction time being 7.0 min and the temperature being 25.0°C. Under the optimum conditions, the proposed method allows the determination of vanadium (V) in the range of 0–70.0 ng mL⁻¹ and the detection limit is down to 0.407 ng mL⁻¹. For standard vanadium (V) solution determination, the recovery efficiency is in the range of 98.5%–102% and the RSD ranges from 0.76%–1.25%. Moreover, it is demonstrated that most cations and anions do not interfere with the determination of vanadium (V) under the analytical condition. The new method was successfully applied in the determination of vanadium (V) in fresh water and seawater samples with satisfactory results. Vanadium (V) in the seawater samples from Qingdao offshore was determined using the method and the distribution of vanadium (V) was mapped. Compared with other instrumental analytical methods, the proposed method shows good selectivity, sensitivity, simplicity, lower cost and rapidity. It can be employed on shipboard easily.  相似文献   

痕量锡的催化还原褪色光度法测定   总被引：1，自引：1，他引：0  

周之荣  金立志 《岩矿测试》1999,18(4):314-316

基于０．０２ｍｏｌ／ＬＨ３ＰＯ４介质中痕量Ｓｎ对盐酸联氨还原酸性铬蓝Ｋ褪色反应的催化作用,建立了测定痕量锡的动力学光度分析法。方法检出限０．０３９μｇ／Ｌ,线性范围０￣４．０μｇ／Ｌ。结合磷酸三丁酯色谱分离,对水系沉积物国家标准物质进行分析,结果与标准值相符。精密度试验以ω（Ｓｎ）为１０＾－６水平的试样检测,其ＲＳＤ≤７．２％。  相似文献   

磁黄铁矿在纳米碳管生长中的作用     

杨翔  陈代璋 《矿物岩石》1999,19(2):5-7

本文采用天然磁黄铁矿矿物－六方磁黄铁矿和单斜磁黄铁矿分别作催化剂,引入电弧法生长纳米碳管,发现二者具有截然不同的催化效果。在此基础上,探讨了在合成纳米碳管实验中磁黄铁矿的催化作用及催化机理。  相似文献   

淡水湖泊水体中溶解有机氮测定方法的对比   总被引：5，自引：0，他引：5  

黎文  白英臣  王立英  王静  傅平青  廖海清  吴丰昌  刘丛强 《湖泊科学》2006,18(1):63-68

溶解有机氮(Dissolved Organic Nitrogen,DON)是天然水体中氮的重要组成部分,目前研究相对很少．本文对淡水中测定DON的两种常见方法即过硫酸钾湿氧化法(Persulfate Oxidation,PO)和高温催化氧化法(High Temperature Cata- lytic Oxidation,HTCO)进行了对比研究．结果表明:两种方法各有特点,湿氧化法相对较为理想．湿氧化法对不同氮标准化合物的回收率较高,平均为96．0±3．0％以上(杂环氮化合物除外);对湖泊淡水样品,用PO法测定溶解有机氮的相对标准偏差范围为6．2％-12．5％．高温催化氧化法对不同氮标准化合物的回收率较低,平均为68．4±13．6％,需作进一步条件优化．  相似文献   

大孔树脂催化合成增塑剂DBP的研究   总被引：3，自引：0，他引：3  

杨志成 《华东地质学院学报》1998,21(2):171-177

本文论述了以功能树脂ＤＯＯＸ为催化剂,邻苯二甲酸酐和正丁醇为原料合成邻苯二甲酸二丁酯的新方法。实验表明,该催化剂具有活性高、选择性好、工艺流程简单、催化剂易回收并可重复使用等优点。在最佳工艺条件下,酯产率可达９０％以上。本方法无环境污染,易于工业化生产。  相似文献   

催化阴极溶出伏安法测定海水中的铁及实验条件的优化     

杨军  王宇婧  张曼平 《海洋技术学报》2001,20(3):61-64

电分析测定海水样品中的铁离子具有准确、快速的优点 ,通过拉丁方正交实验设计分析各个因子的影响 ,优化了催化阴极溶出伏安法的实验条件。分析表明催化电流受到 p H值的显著影响 ,而其它试剂的浓度及富集时间对峰高影响不显著 ,优化后方法的检出限为 6.5× 10 - 1 0 mol· dm- 3,线性范围在 1× 10 - 9mol· dm- 3至 1× 10 - 6 m ol·dm- 3。可应用于海水中痕量铁的分析。  相似文献   

极谱催化波对化探样品中微量钨钼的同时测定     

马凤英 《安徽地质》2013,(3):214-215

本文着重研究了利用极谱法测定钨钼的简便方法,如一次扫描同时读出钼钨的波高,一次性加入混合底液等,该方法使钨钼的测定变得轻松快捷。方法经国家一级标样检验,测定结果与标准值相符。本方法适用于钨含量在0.4×10-6～100×10-6钼含量在0.3×10-6～50×10-6的测定。  相似文献   

Statistical Optimization of Anaerobic Biological Processes for Dye Treatment     

Zahra Khalili  Babak Bonakdarpour 《洁净——土壤、空气、水》2010,38(10):942-950

In the present study both the synthetic media composition as well as some process parameters in the anaerobic decolorization of Reactive Black 5 (RB5) by activated sludge were studied and optimized using statistical design of experiments (DOEs). Statistical analysis of the results of Plackett–Burman DOE showed that the addition of Mn or Fe, or increase in concentration of Mg, had a positive effect on the anaerobic decolorization efficiency whereas the effect of increase in concentration of glucose, ammonium chloride, and calcium chloride was negative. The effect of change in the concentration of glucose, mixed liquor suspended solid (MLSS), and RB5 on the anaerobic decolorization efficiency and rate and chemical oxygen demand (COD) removal was studied using central composite design methodology. Statistical analysis of the data showed that all the factors had significant effect on both the dye decolorization efficiency and rate. The interaction of glucose with MLSS and with dye and the interaction of MLSS with glucose and with dye were significant when the response was decolorization efficiency and rate, respectively. When COD removal was the response, the effect of change in glucose and MLSS concentration and the interaction between these two factors had statistically significant effect on the response.  相似文献   

亮绿SF-过氧化氢体系催化动力学光度法测定痕量钒     

陈宗保  谢建鹰 《岩矿测试》2009,28(4):397-398

在硫酸介质中,痕量钒(Ⅴ)能明显催化过氧化氢氧化亮绿SF褪色,通过研究该反应的最佳实验条件和动力学参数,建立了测定痕量钒的新催化动力学光度法。该方法选择性强、操作简便、快速,其线性范围为0.0~40ng/mL,检出限为5.2ng/L。方法用于水样及茶叶中痕量钒(Ⅴ)的测定,结果满意。  相似文献