Spectrophotometric determination of iron as phenylfluorone complex sensitized with Triton X-100

Summary The effect of some surfactants and protective colloids on the absorbance of the iron(III)-phenylfluorone complex has been investigated. The binary complex formed at pH 9.0 show a molar absorptivity of 7.5×10⁴ l · mol^–1 · cm^–1 at 530 nm. In the presence of 2% Triton X-100, at the same pH, the molar absorptivity of the sensitized complex was 1.19×10⁵ l · mo^–1 · cm^–1 at 555 nm. Full colour development of the sensitized complex occurred within 25 min and Beer's law was followed up to 0.53 ppm of iron. The molar ratio and continuous variation methods indicated a 13 metal-ligand ratio for the sensitized complex. The effect of various amounts of different ions has been studied under the experimental conditions and some masking agents were recommended. The method has been applied to the determination of iron in copper and nickel metals and some non-ferrous alloys.

---

Spektralphotometrische Bestimmung von Eisen als Phenylfluoronkomplex sensibilisiert mit Triton X-100

     

Spectrophotometric determination of molybdenum(VI) with Bromopyrogallol red in the presence of Triton X-114

The complexation of molybdenum(VI) with Bromopyrogallol Red in the presence of the nonionic surfactant Triton X-114 is studied spectrophotometrically. A mixed-ligand complex is formed with the component ratio 1: 1: 1 and a stability constant of logβ = 8.2. The effect of pH, time, temperature, and component concentrations on the formation of the mixed-ligand complex is studied. A highly selective procedure for the spectrophotometric determination of trace molybdenum(VI) in drinking water in the presence of tungsten has been developed.     

Spectrophotometric method for the determination of manganese with phenylfluorone in the presence of Triton X-100 and cetylpyridinium chloride in pharmacological preparations and vegetable fertilizers

A simple and very sensitive method for the spectrophotometric determination of manganese in pharmacological preparations and vegetable fertilizers is proposed. The method is based on the formation of a blue coloured complex of Mn (II) with 9-phenyl-2,3,7-trihydroxy-6-fluorone (PF) in the presence of cetylpyridinium chloride (CP) and Triton X-100. Optimum concentrations of PF, CP, Triton X-100 and pH ensuring maximum absorbance were defined. The complex Mn(II)-PF-CP-Triton X-100 shows maximum absorbance at 591 nm with the molar absorptivity value 1.77x10(5 )L mol(-1 )cm(-1). The detection limit of the method is 0.004 microg mL(-1). The Beer's law is obeyed for manganese concentrations in the range 0.02-0.2 microg mL(-1). The effect of foreign ions was elucidated. The statistical evaluation of the method was carried out for six determination using 5 microg Mn and the following results were obtained: standard deviation 0.021, confidence interval 5.05+/-0.05 microg Mn. The method has been applied for the determination of manganese in pharmacological preparations (Biovital, Kinder Biovital) and vegetable fertilizers (Hydrovit 100, Florovit).     

Triton X-100存在下镉试剂分光光度法测定痕量铊(III)

本文首次提出了在Triton X-100存在下, 以镉试剂作显色剂于水相直接分光光度法测定了痕量铊, 结果表明: 该体系具有很高的灵敏度, 是目前分光光度法测定铊的最灵敏方法之一.     

Spectrophotometric determination of bismuth with semi-xylenol orange and its application in metal analysis

Semi-Xylenol Orange forms a 2 : 1 chelate with bismuth(III), which has a logarithmic value of 3.08 for its conditional formation constant and a molar absorptivity of 4.2 x 10(4) l.mole(-1).cm(-1). Beer's law is obeyed at 540 nm over the range 10-30 mug of Bi(III), with a standard deviation of 1.1 mug (n = 18). Lactic acid is used as an auxiliary complexing agent to prevent olation and oxolation. Interference from up to 1.3 mg of copper can be eliminated by the combined use of masking Cu(II) with thiourea, ascorbic acid and thiosemicarbazide and "post-masking" Bi(III) with sodium chloride. The proposed method has been successfully applied to the direct determination of 0.002% of Bi in lead metal, with a coefficient of variation varying from 3.7 to 6.9%.     

Photoinitiated gold sol generation in aqueous Triton X-100 and its analytical application for spectrophotometric determination of gold

Gold complex, HAuCl(4) has been transformed into pink-coloured stable gold sol having lambda(max) at 523 nm (in=3.06x10(3)1.mol(-1)cm(-1)) at room temperature in aqueous Triton X-100 (TX-100) upon photoirradiation. It is a very rapid and simple process and the absorbance at 523 nm is a direct measure of gold concentration. Beer's law is obeyed in the range of 0-150 ppm of gold. The relative standard deviation for 22.7 and 90.9 ppm of gold are 2.8 and 2.5% respectively. The 95% confidence limit (ten determinations) for 22.7 ppm of gold is 23.6+/-0.5 ppm. Sandell sensitivity is 6.44x10(-2) mug cm(-2). TX-100 acts both as a reducing agent and a stabilizer here. Statistical parameters, effects of TX-100 concentration, irradiation time and interferents are studied. The method is applicable for ore and synthetic mixture analysis.     

Spectrofotometric determination of copper in sugar cane spirit using biquinoline in the presence of ethanol and Triton X-100

The present paper proposes a method for molecular spectrophotometric determination of copper in sugar cane spirits. The copper(I) reacts with biquinoline forming a pink complex with maximum absorption at 545 nm. The reaction occurs in the presence of hydroxylamine, ethanol and Triton X-100 tensioative. Determination of copper is possible in a linear range 0.2-20.0 mgL(-1) with a detection limit 0.05 mgL(-1). The great advantages of the proposed methodology are the elimination of liquid-liquid extraction step and the use of toxic organics solvents, like dioxane, to dissolve the reagent.     

Fluorescence quenching method for the determination of sodium dodecyl sulphate with near-infrared hydrophobic dye in the presence of Triton X-100

A fluorophotometric method for the determination of anionic surfactant sodium dodecyl sulphate (SDS) was proposed. The method is based on the quenching effect of SDS on the fluorescence of near-infrared (NIR) hydrophobic dye, 2-[4'chloro-7'(3'hexadecyl-2'benzothiazolinylidene)-3',5'-(1',3'-propanediyl)-1',3',5'-heptatriene-1'-yl]-3-ethylbenzothiazolium iodide (dye I) in the presence of Triton X-100. The calibration graph is linear in the concentration range from 0 to 2 x 10(-6) mol L(-1) of SDS with a detection limit (LOD) of 8.3 x 10(-8) mol L(-1). The relative standard deviation for the determination of 7 x 10(-7) mol L(-1) SDS was 4.1%. Recoveries of 95.3-110.3% were found for the addition to 1.0 x 10(-6) mol L(-1) SDS in the analysis of environmental water samples. Preliminary research shows that the fluorescence quenching is due to the formation of dye aggregate facilitated by SDS.     

催化动力学分光光度法测定痕量甲醛

甲醛属有毒化学物质,皮肤接触甲醛可引起组织坏死,经消化道吸收,可使口腔粘膜糜烂,产生上腹疼痛、吐血昏迷、肝脏损害及急性肾功能衰竭等症状,甲醛已被列为可疑致癌物之一。个别不法商贩将甲醛直接加入水发产品、米粉、面类和腐竹等食品中,它会在人体中蓄存,达到一定浓度时集中爆发,对人们的身体健康造成极大的威胁。因此对环境及     

Phase separation in non-ionic surfactant Triton X-100 solutions in the presence of phenol

The influence of concentration conditions and acidity on the phase separation in non-ionic surfactants Triton X-100 solutions in the presence of phenol was investigated. It was shown that the addition of small amounts of phenol results in the decrease of the cloud point temperature of Triton X-100 solutions. On the other hand, the addition of phenol into the investigated system resulted in the decrease of the hydration values of surfactant-rich phases and the increase of their hydrophobicity. The extraction degree and distribution coefficient of phenol between the water and the surfactant-rich phases were studied. On the basis of data obtained the molar parts of water, phenol and Triton X-100 in the non-ionic surfactant-rich phases formed at different concentration conditions were calculated. Possibilities of the application of phenol-induced micellar extraction for microcomponents preconcentration were estimated.     

Spectrophotometric determination of silver with cadion 2B and triton X-100

A highly sensitive and selective procedure for spectrophotometric determination of silver has been developed. At pH 9.2, in the presence of Triton X-100, silver forms a dark red-violet complex with cadion 2B which has an absorption maximum at 565 nm. The molar absorptivity is 1.0 x 10(5) l.mole(-1).cm(-1). Beer's law is obeyed for silver in the range 0.02-0.8 mug ml . The colour reaction, if EDTA is used as a masking agent, is free from interference by the 20 cations and 19 anions investigated. Only Cl(-), Br(-), I(-), S(2-) and CN(-) interfere and must be absent. This method has been used to determine silver in waste-water.     

头孢唑酮与Triton X-100缔合体系的相互作用

抗生素头孢唑酮的加入使得非离子表面活性剂Triton X-100的表面活性降低. ¹H-NMR的结果表明，头孢唑酮增溶于胶束极性基团附近.头孢唑酮与Triton X-100胶束的结合常数随Triton X-100含量的增加而下降，但头孢唑酮在Triton X-100胶束相和水连续相之间的分配系数不随Triton X-100含量变化而变化.     

Chemiluminescence determination of surfactant Triton X-100 in environmental water with luminol-hydrogen peroxide system

Background  

The rapid, simple determination of surfactants in environmental samples is essential because of the extensive use and its potential as contaminants. We describe a simple, rapid chemiluminescence method for the direct determination of the non-ionic surfactant Triton X-100 (polyethylene glycol tert-octylphenyl ether) in environmental water samples. The optimized experimental conditions were selected, and the mechanism of the Luminol-H₂O₂-Triton X-100 chemiluminesence system was also studied.     

Capillary electrochromatography of Triton X-100

Nonionic surfactants such as Triton X-100 (TX-100) are comprised of a mixture of oligomers with a varying degree of length in the ethoxylate chain. The development of chromatographic methods for resolution of the various oligomers of TX-100 is of environmental importance, and can be useful for quality control and characterization in industrial manufacture. Capillary electrochromatography (CEC) is fast becoming a capable separation technique that combines the benefits of both high-performance liquid chromatography (HPLC) and capillary electrophoresis (CE). This report presents a novel CEC method for separation of the various TX-100 oligomers. A comparison of monomeric vs. polymeric stationary phases for separation of TX-100 was conducted. Since the oligomers of TX-100 were better resolved on a monomeric phase as compared to polymeric phase, a systematic mobile phase tuning was performed utilizing a monomeric CEC-C18-3 microm-100 A stationary phase. Various mobile phase parameters such as acetonitrile (ACN) content, Tris concentration, pH, voltage, and temperature were manipulated in order to achieve the optimum separation of oligomers in less than 30 min.     

Gamma-radiolysis of Triton X-100 aqueous solution

The decomposition of the non-ionic surfactant Triton X-100 in gamma-irradiated deaerated aqueous solution is mainly attributed to the attack of OH radicals and H atoms. The mechanisms of these reactions were investigated in detail, including the influence of pH and dose rate. The RCHOH radicals formed by OH attack on alcohol molecules can decompose the surfactant in aqueous solution.     

Triton X-100体系层状液晶结构及其润滑性能

用小角Ｘ射线衍射和＾２ＨＮＭＲ方法测定ＴｒｉｔｏｎＸ－１００／ｎ－Ｃ１０Ｈ２１ＯＨ／Ｈ２Ｏ体系层状液晶的结构。用高速环块磨损试验机考察了不同组分含量的层状液晶对铝合金－钢磨擦副润滑性能的影响。结果表明：随着水含量的增加,层次液晶两新双层中分子的有序度降低,润滑效果也降低;随着ＴｒｉｔｏｎＸ－１００含量增加,层状液晶两亲双层中分子的有序度增加,其润滑效果提高。     

Triton X-100体系层状液晶结构及其润滑性能

用小角X射线衍射和2HNMR方法测定TritonX 100/n C10H21OH/H2O体系层状液晶的结构.用高速环块磨损验机考察了不同组分含量的层状液晶对铝合金 钢磨擦副润滑性能的影响.结果表明:随着水含量的增加,层液晶两亲双层中分子的有序度降低,润滑效果也降低;随着Tri tonX 100含量增加,层状液晶两亲双层中分子有序度增加,其润滑效果提高.     

Simultaneous spectrofluorimetric determination of terbium,samarium and europium with hexafluoroacetylacetone-trioctylphosphine oxide and Triton X-100

In aqueous solution, the fluorescence intensity is a linear function of concentration in the ranges 1.0 × 10^?4-1.0 × 1.0^?6 M Sm and 1.0 × 10^?6-1.0 × 10^?8 M Tb and Eu. The optimum conditions are 1 × 10^?3 M hexafluoroacetylacetone, 1 × 10^?4 M trioctylphosphine oxide and 0.05% Triton X-100 at pH 3.0.     

Positronium formation in aqueous Triton X-100 solution

The influence of micelles, formed by the aggregation of nonionic surfactant molecules, on positronium formation (combination of e⁻ and e⁺) probability is discussed in the light of radiation chemical phenomenon at the end part of the radiation track. The contribution due to the parapositronium/narrow-component intensity in the presence of micellar aggregation and further structural reorganization constitutes important aspects of the ortho-para conversion process.     

Synthesis of fluorescent alkoxybenzylidene derivatives of malononitrile dimer in water in the presence of Triton X-100

An efficient procedure has been developed for the synthesis of alkoxybenzylidene derivatives of malononitrile dimer in water in the presence of nonionic surfactant (Triton X-100). Depending on the number and position of alkoxy groups, the products showed solid-state fluorescence with the emission maximum in the range λ 491–560 nm.