Flotation Spectrophotometric Determination of Aluminium with Alizarin

ABSTRACT

Aluminium was determined in a weakly alkaline medium by reaction with alizarin at trace level. Flotation of the complex was carried out with heptane, followed by dissolution in N, N-dimethylformamide (DMF) for subsequent spectrophotometric determination. The molar absorptivity was 2.92×10⁵ mol^? cm^? at 518 run. Beer's law was obeyed in the range 5–80 μg/1 and the detection limit was 0.4μg/l.

The reliability of the procedure was confirmed by determination of a sample of milk with Graphite Furnace Atomic Absorption Spectrophotometric method (GFAAS). The precision and accuracy of the method were both acceptable via F and tests at the 95% confidence level.     

铝-二甲酚橙-吐温20三元体系光度法测定铝

研究了吐温20(Tween20)存在下,铝与二甲酚橙(XO)的显色反应,建立了分光光度法测定微量铝的新方法.结果表明,在pH=3.13的乙酸-乙酸钠缓冲介质中,铝与XO及吐温20反应生成有色络合物,络合物的最大吸收波长位于511 nm处, 表观摩尔吸光系数ε为1.99×10~4 L·moL~(-1)·cm~(-1),在10 mL溶液中,铝量在2.2～15.1 μg范围内符合比耳定律,检出限为0.0018 μg/mL.方法应用于茶叶、沙棘叶中铝的测定,样品加标回收率为96%～102.6%.     

邻硝基苯基荧光酮-Tween 80双波长分光光度法测定微量铝

本文研究了在非离子表面活性剂Tween 80存在下Al(Ⅲ)与O-NPF显色反应的条件,在pH9.0～11.0的HBO_3-Na_2CO_3缓冲溶液中可形成稳定的紫色络合物,最大吸收波长为564nm,铝量在0～5μg/25ml范围符合比尔定律,采用双波长法摩尔吸光系数高达1.81×10~5。本法具有简便、快速、灵敏度高、准确性好等优点。     

桑色素光度法测定痕量铝和聚丙烯酰胺

基于聚丙烯酰胺（ＰＡＭ）作为增稳剂时,Ａｌ＾３＋叠色素（ｍｏｒｉｎ）之间的显色反应,提出了一种简便,快速,高灵敏测定痕量铝的光度法,络合物组成比为Ａｌ：ｍｏｒｉｎ＝１：２;表观摩尔吸光系数ε４０８＝６．３×１０＾７Ｌ．ｍｏｌ＾－１．ｃｍ＾－１;铝浓度在０．０４－０．２８μｇ／Ｌ范围内服从比尔定律;检测限４．０×１０＾－１０ｇ／Ｌ。     

氟-铝络合滴定计算分析法测定乙醇-水溶液介质中的铝

导出了氟离子标准溶液滴定铝离子的络合滴定计算分析的数学模型。以氟离子选择性电极作指示电极,利用氟离子与铝离子在乙醇-水溶液中产生沉淀,仅形成3种络合物的现象,先计算出3个条件累积稳定常数,再计算出铝离子的分析浓度。通过氢氧化铝的条件溶度积常数,求出溶液控制的pH值约为4．7。讨论了滴定数据的位置对测定结果的影响。     

分光光度法测定卡那霉素的研究

在ＰＨ６．５－８．８的水溶液中,作为氨基糖甙类广谱抗生素的卡那霉素与Ｃｕ＾２＋离子迅速反应形成稳定的２：１带正电荷络合物,其λｍａｘ为２５６ｎｍ,其表观ε为１．８１×１０＾３Ｌ·ｍｏｌ＾－１·ｃｍ＾－１。卡地霉素含量在１．３０－１２０ｍｇ／Ｌ范围内遵从比耳定律,并探讨了络合物的结构。该方法用于注射用硫酸卡那霉素样品中卡那霉素含量的测定。结果与常规的抗生素微生物法相比,具有简便和快速的优点。     

双硫腙萃取光度法测定锌的研究

锌是一种重要的微量元素 ,其测定多采用原子吸收、等离子体发射光谱、电位溶出法等。本文报道双硫腙萃取光度法测定微量锌的新方法 ,其线性范围 0～ 4 .0μg/ 5 m L,Sandell灵敏度 =4 0 .0× 1 0 - 4 μg· cm- 2 ,变异系数 3.1 6 % ,回收率97.7%～ 1 0 3.4 %。方法用于粮食、饲料、生物材料等实际样品分析 ,结果满意。     

乙酰胺的分光光度检测

研究了乙酰胺的分光光度分析方法。该方法用溴水氧化酰胺 ,其氧化产物可把 I-氧化成 I2 ,I2 再和淀粉 -KI生成有色络合物来测定酰胺的含量 ,主要适用于伯酰胺的分析。方法在 5× 1 0 - 6 ～ 1× 1 0 - 4 g/ 2 5m L范围内符合比耳定律 ,表观摩尔吸光系数 ε5 76 nm=4 .5× 1 0 4L·mol- 1·cm- 1。该法灵敏、快速、重现性好。     

Selective Spectrophotometric Determination of Aluminium in the Presence of Beryllium and Lanthanide Cations

 A spectrophotometric method for the selective determination of Al(III) in the presence of Be and lanthanide cations is proposed. It is based on the selective reaction of Semi-Xylenol Orange with Al(III) at pH 2.6. The presence of 8% v/v of 1,2- ethanediol serves to stabilize the chelate formed by heating for 5 min at 100 °C. 0.5 mg each of Be(II), Ce(III), La(III), 4 mg of Mn(II), 1.2 mg of Pb(II), 1 mg of Tl(I), 40 mg each of Ca(II) and Mg(II) and 1.9 mg of sodium dihydrogen phosphate are tolerable. A ligand buffer of HEDTA-Pb is incorporated to further enhance the selectivity of the color reaction. Under the specified condition Semi-Xylenol Orange reacts with Al(III) to form a 1:1 chelate, its molar absorptivity at 526 nm was found to be 3.3 × 10⁴ L mol⁻¹ cm⁻¹. The linear regression equation for 2–20 μg of Al(III) is A = 0.04458C + 0.0112 (here C stands for the concentration of Al(III), μg per 25 mL), and correlation coefficient γ = 0.9988. The RSD at a level of 10 μg (n = 10) and LOQ were found to be 3.5% and 2 μg respectively. Author for correspondence. E-mail: weston@online.sh.cn Received November 15, 2002; accepted February 11, 2003 Published online June 13, 2003     

Selective Spectrophotometric Determination of Aluminium in the Presence of Beryllium and Lanthanide Cations

A spectrophotometric method for the selective determination of Al(III) in the presence of Be and Ln (lanthanide) cations is proposed. It is based on the selective reaction of SXO (Semi-Xylenol Orange) with Al(III) at pH 2.6. The presence of 8%v/v of 1,2-ethanediol serves to stabilize the chelate formed by heating at 100°C for 5min. 0.5mg each of Be(II), Ce(III), La(III), 4mg of Mn(II), 1.2mg of Pb(II), 1mg of Tl(I), 40mg each of Ca(II) and Mg(II) and 1.9mg of sodium dihydrogen phosphate are tolerable. A ligand buffer of HEDTA-Pb is incorporated to further enhance the selectivity of the color reaction. Under the specified conditions SXO reacts with Al(III) to form a 1:1 chelate. Its molar absorptivity at 526nm was found to be 3.3×10⁴Lmol^–1cm^–1. The linear regression equation for 2–20µg of Al(III) is A=0.04458C+0.0112 (where C stands for the concentration of Al(III), µg per 25mL) and correlation coefficient =0.9988. The RSD at the level of 10µg (n=10) and LOQ were found to be 3.5% and 2µg, respectively.     

醇的分光光度检测

研究了在相转移催化剂条件下正丁醇的分光光度检测法 ,该法对比耳定律的适用范围是 2～ 1 3μg/m L,表观摩尔吸光系数 ε30 0 =1 0 4 L· mol- 1·cm- 1。     

可变误差多面体法同时测定复方新诺明中二组分的含量

以可变误差多面体法处理多波长吸光光度数据同时测定了复方新诺明制剂模样和五个批号实际样品中磺胺甲恶唑（ＳＭＺ）,甲氧苯氨嘧啶（ＴＭＰ）的含量,１１份模拟样中ＳＭＺ、ＴＭＰ的回收率分别为９９．８％和１００．３％,复方新诺明片和注射液的测定结果与药典方法一致。     

A Spectrophotometric Study of the Determination of Copper with Dithiooxamide in Acidic Media

Abstract

A spectrophotometric method for the determination of copper has been developed based on the development of a red color in acidic solution using dithiooxamide as the chromogenic agent. The molar absorptivity is 7.04 × 10³ 1. mol^?1 cm^?1 at 525 nm. Relatively few ions interfere.     

新试剂3,5—二溴—4—偶氮8—羟基喹啉苯基荧光酮光度法测定微量铝

在溴化十六烷基三甲胺（ＣＴＭＡＢ）存在下，ＰＨ６，０的ＨＡｃ－ＮａＡｃ缓冲介质中，铝与新试剂３，５－二溴－４－偶氮８－羟基喹啉苯基荧光酮形成红色三元胶束配合物，最大吸收波长位于５６４ｎｍ，表观摩尔吸光系数ε为１．３５×１０＾５．ｍｏｌ＾－１．ｃｍ＾－１，铝浓度在０～５μｇ／２５ｍＬ范围内符合比耳定律，拟定的方法用于铝铁黄铜中微量铝的测定，结果满意。     

5-(对-甲基苯基偶氮)-8-氨基喹啉分光光度法测定铝合金中微量铜

本文研究了5-(对-甲基苯基偶氮)-8-氨基喹啉(p-MPAQ)分光光度法测定微量铜(Ⅱ)的条件。在阳离子表面活性剂CTMAB存在下,于pH9.0～10.0的缓冲介质中,铜与p-MPAQ形成1:1的棕红色配合物,其表观摩尔吸光系数ε_(547)为3.62×10~4L·mol~(-1)·cm~(-1),Aλ高达117nm,铜量在0～13μg/10mL范围内服从比尔定律。采用氟化钠作掩蔽剂,可不经分离,直接测定铝合金中的微量铜。     

对磺酸基苯基亚甲基若丹宁光度法测定三乙酸甘油酯中的汞

合成了一种新的若丹宁类试剂对磺酸基苯基亚甲基若丹宁 (SBDR) ,并用红外光谱和元素分析进行结构鉴定。研究了该试剂与汞的显色反应 ,在 p H4.0的HAc- Na Ac缓冲介质中 ,吐温 - 80存在下 ,SBDR与汞反应生成 2∶ 1稳定络合物 ,λmax=5 1 0 nm,ε=1 .0 7× 1 0 5L· mol- 1· cm- 1。汞含量在 0～ 3 0μg/2 5 m L内符合比耳定律。方法用于三乙酸甘油酯中汞含量的测定 ,结果满意。     

褪色光度法测定氰化物

根据ＣＮ－ 对５－（４－磺酸基苯偶氮）－８－氨基喹啉（ＳＰＡＱ）－Ｎｉ２＋ －ＣＴＭＡＢ体系的干扰褪色作用，建立了一种测定氰化物的新方法。该方法比传统方法操作简便，不需要萃取。体系λｍ ａｘ＝ ６００ｎｍ ，ε＝ ６．８８×１０４ Ｌ·ｍ ｏｌ－ １·ｃｍ － １。ＣＮ－ 含量在０～５ μｇ／２５ｍ Ｌ内符合比尔定律。方法用于环境水样中氰化物的测定。     

非催化动力学光度法测定铬的研究

研究了在ＨＣｌ介质中，Ｃｒ（Ⅵ）氧化碘离子显色反应的动力学条件，建立了测定Ｃｒ（Ⅵ）的非催化动力学分析法。方法的灵敏度７．２７×１０－７ｇ·Ｌ－１，检测限５．３３×１０－６ｇ·Ｌ－１，测定范围２×１０－５～３×１０－４ｇ·Ｌ－１。用于测定标钢中的铬，测定值与标准值基本一致     

A Sensitive and Specific Resin-Bead Test for Histidine and Its Spectrophotometric Determination Using KBr-KBrO3 Reagent

Abstract

A new, sensitive and specific spot test has been developed for histidine on resin beads. Also, a spectrophotometric method has been devised improving the old Knoop method, which is quite precise and applicable in clinical and biomedical analysis. A tentative mechanism has been proposed for the reaction.