scholarly journals Using nanometer TiO2 modified with cetyl trimethyl ammonium bromide for separation and preconcentration of Parathion in water sample

2016 ◽  
Vol 17 (2) ◽  
pp. 362-371
Author(s):  
Haghighe Fathi ◽  
Robab Soltani-Jigheh ◽  
Saeed Hemmati
Keyword(s):  
Water Samples ◽  
Cetyl Trimethyl Ammonium Bromide ◽  
Solid Phase ◽  
Environmental Water ◽  
Sample Volume ◽  
Ammonium Bromide ◽  
Base Line ◽  
Relative Standard ◽  
Separation And Preconcentration ◽  
Cetyl Trimethyl Ammonium

In this work, nanometer TiO2 modified by cetyl trimethyl ammonium bromide (CTAB) was used as adsorbent for solid-phase extraction (SPE) of Parathion in environmental water samples. Adsorbed Parathion was then desorbed with different eluents and determined by gas chromatography (GC)/flame ionization detection. Greater selectivity, resolution, and sensitivity have been seen by GC compared with other methods. Parameters that might influence the extraction efficiency, such as the eluent type and its volume, adsorbent amount, sample volume, sample pH and sample flow rate, were optimized. Under the optimized extraction conditions with toluene as the eluent, the experimental results showed the excellent linearity of Parathion (R2 > 0.99) over the range of 0.01–0.8 μg/mL, and the relative standard deviation was 6.3% (n = 5). The detection limit of the proposed method could reach 0.024 ng/mL based on the ratio of chromatographic signal to base line noise (S/N = 3). Recovery of 93% was achieved with spiked water samples. The method was successfully applied to the analysis of surface water samples.

scholarly journals Solid-Phase Extraction of Trace Amounts of Uranium(VI) in Environmental Water Samples Using an Extractant-Impregnated Resin Followed by Detection with UV-Vis Spectrophotometry

2013 ◽  
Vol 2013 ◽  
pp. 1-10 ◽  
Author(s):  
Ahmad Hosseini-Bandegharaei ◽  
Masoud Sarwghadi ◽  
Aliasghar Heydarbeigi ◽  
Seyyed Hossein Hosseini ◽  
Mehdi Nedaie
Keyword(s):  
Water Samples ◽  
Solid Phase ◽  
Environmental Water ◽  
Extraction Methods ◽  
Sample Volume ◽  
Environmental Water Samples ◽  
Adsorption Model ◽  
Separation And Preconcentration ◽  
Impregnated Resin ◽  
Maximum Sorption

A stable extractant-impregnated resin (EIR) containing Chrome Azurol B was prepared using Amberlite XAD-2010 as a porous polymeric support. The new EIR was employed for trace separation and preconcentration of U(VI) ion followed by spectrophotometric determination with the arsenazo III procedure. CAB/XAD-2010 exhibited excellent selectivity for U(VI) ion over coexisting ions. Experimental parameters including pH, contact time, shaking speed, and ionic strength were investigated by batch extraction methods. Maximum sorption of U(VI) ions occurred at pH 4.3–6.9. The capacity of EIR was found to be 0.632 mmol·g−1. Equilibrium was reached in 25 min and the loading half-time,t1/2, was less than 6 min. The equilibrium adsorption isotherm of U(VI) was fitted with the Langmuir adsorption model. In addition, a column packed with CAB/XAD-2010 was used for column-mode separation and preconcentration of U(VI) ion. For the optimization of the dynamic procedure, effects of sample volume, sample and eluent flow rate, eluent concentration, and its volume were investigated. The preconcentration factors for U(VI) were found out to be 160. But, for convenience, a preconcentration factor of 150 was utilized for the column-mode preconcentration. The dynamic procedure gave a detection limit of5.0×10-10 mol·L−1(0.12 μg·L−1) for U(VI) ion. The proposed dynamic method showed good performance in analyzing environmental water samples.

Study on Flotation Separation of Trace Copper in Water Samples Using Microcrystalline Adsorption System Prior to the Determination by Spectrophotometry

2013 ◽  
Vol 864-867 ◽  
pp. 333-338
Author(s):  
Xin Rong Wen ◽  
Chang Qing Tu
Keyword(s):  
Ascorbic Acid ◽  
Water Samples ◽  
Cetyl Trimethyl Ammonium Bromide ◽  
Environmental Water ◽  
Ammonium Bromide ◽  
Separation Mechanism ◽  
Adsorption System ◽  
Novel Method ◽  
Cetyl Trimethyl Ammonium

The paper presents a novel method for the flotation separation of Cu2+ using microcrystalline adsorption system and the determination of trace Cu2+ in water samples by spectrophotometry. The effects of different parameters,such as the dosages of KI, ascorbic acid (AA) and cetyl trimethyl ammonium bromide (CTMAB),various salts and acidity on the flotation yield of Cu2+ have been investigated. The possible flotation separation mechanism of Cu2+ was discussed.The results showed that under the optimum conditions, CTMAB cation (CTMAB+) reacted with I- to produce the microcrystalline matter (Ms-M) of (CTMAB+·I-), Cu2+ could be reduced to Cu+ by ascorbic acid,and then Cu+ reacted with I- to form the precipitation of CuI.The precipitation of CuI was quantificationally adsorbed on the surface of Ms-M of (CTMAB+·I-) and was floated above water phase. While Zn2+,Ni2+,Co2+, Mn2+, Fe2+ and Al3+ could not be floated.Therefore, Cu2+ was separated completely from the above metal ions. The proposed method has been successfully applied to the determination of trace Cu2+ in various environmental water samples by spectrophotometry after flotation separation using microcrystalline adsorption system, and the results agreed well with those obtained by GFAAS method.The recoveries were 98.4%~106.8%, and the RSD was 1.1%~1.6%.

scholarly journals Solid phase extraction and determination of indium using multiwalled carbon nanotubes modified with magnetic nanoparticles

2018 ◽  
Vol 1 (01) ◽  
pp. 5-10 ◽  
Author(s):  
Ehsan Zolfonoun
Keyword(s):  
Inductively Coupled Plasma ◽  
Solid Phase ◽  
Optical Emission ◽  
Environmental Water ◽  
Sample Volume ◽  
Emission Spectrometry ◽  
Multiwalled Carbon ◽  
Inductively Coupled ◽  
Relative Standard

In this work MWCNTs-Fe3O4 nanocomposite was used as an adsorbent for extraction and preconcentration of indium from aqueous solutions. The magnetic MWCNTs with adsorbed analytes were easily separated from the aqueous solution by applying an external magnetic field. After elution of the adsorbed analytes, the concentration of indium was determined using inductively coupled plasma optical emission spectrometry determination. The effects of pH, sorbent amount, eluent type, chelating reagent concentration, sample volume and time on the recovery of the In(III) were investigated. Under the optimum conditions, the detection limit for In(III) was 0.28 μg L−1. The precision of the method, evaluated as the relative standard deviation obtained by analyzing a series of ten replicates, was 3.1 %. The method was successfully applied for the determination of In(III) in environmental water samples.

Study on Separation/Enrichment of Trace Nickel in Water Samples Using Ammonium Sulfate-Dithizone-Cetyl Trimethyl Ammonium Bromide System

2014 ◽  
Vol 665 ◽  
pp. 233-236
Author(s):  
Chang Qing Tu ◽  
Xin Rong Wen
Keyword(s):  
Metal Ions ◽  
Ammonium Sulfate ◽  
Water Samples ◽  
Cetyl Trimethyl Ammonium Bromide ◽  
Ammonium Bromide ◽  
Optimum Conditions ◽  
Novel Method ◽  
Cetyl Trimethyl Ammonium

The paper presents a novel method for the separation/enrichment of trace Ni2+ using (NH4)2SO4-dithizone(H2Dz)-cetyl trimethyl ammonium bromide(CTMAB) system.The effects of different parameters on the enrichment yield of Ni2+ have been investigated. The possible enrichment mechanism of Ni2+ was discussed.The results showed that under the optimum conditions,the water-insoluble chelate of Ni(H2Dz)2 which formed by Ni2+ and H2Dz was quantificationally floated onto CTMAB foam phase.In this condition, Cd2+、Zn2+、Mn2+、Fe2+ and Co2+ could not be floated.Therefore, Ni2+ was separated completely from the above metal ions. The proposed method has been successfully applied to the separation/enrichment of Ni2+ in various water samples, and the recoveries were 94.2%～103.8%.

scholarly journals Magnetic Polydopamine Modified with Choline-Based Deep Eutectic Solvent for the Magnetic Solid-Phase Extraction of Sulfonylurea Herbicides in Water Samples

2020 ◽  
Vol 59 (1) ◽  
pp. 95-102
Author(s):  
Dan-Dan Wang ◽  
Zhi-Heng Lu ◽  
Xiao-yu Guan ◽  
Mei-Nan Ou Yang ◽  
Hao-Ming Guo ◽  
...  
Keyword(s):  
Solid Phase Extraction ◽  
Water Samples ◽  
Solid Phase ◽  
Magnetic Solid Phase Extraction ◽  
Infrared Spectrometry ◽  
Phase Extraction ◽  
Sulfonylurea Herbicides ◽  
Relative Standard ◽  
Separation And Preconcentration ◽  
Magnetic Solid

Abstract A novel magnetic solid-phase extraction technique coupled to ultraperformance liquid chromatography has been developed for separation and preconcentration of four sulfonylurea herbicides (sulfosulfuron, bensulfuron-methyl, pyrazosulfuron-ethyl and halosulfuro-methyl) in aqueous samples. The key point of this method was the application of a novel magnetic nanomaterial that composed of a low eutectic solvent as a shell coated on the magnetic core modified by polydopamine. The extensive active sites outside the low eutectic solvent can effectively adsorb the target herbicide in the extraction process. The obtained magnetic adsorbent was characterized with fourier transform infrared spectrometry, scanning electron microscopy and vibrating sample magnetometer. The influence parameters relevant to this method were optimized. Under the optimum conditions, good linearities could be obtained within the range of 1.0–200 μg L−1 for all analytes, with correlation coefficients ≥0.9908. The limit of detections of the method was between 0.0074 and 0.0100 μg L−1 and the relative standard deviations were 1.1–3.6%. The enrichment factor is 66.6. In the final experiment, the proposed method was successfully applied to the analysis of sulfonylurea herbicides residue in environment and drinking-water samples, and the obtained recoveries were between 70.6% and 109.4%.

scholarly journals Fast Analysis of Water Samples for Trace Amount of Crystal Violet Dye Based on Solid Phase Extraction Using Nanoporous SBA-3 prior to Determination by Fiber Optic-Linear Array Detection Spectrophotometry

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
Azam Azarkohan ◽  
Farzaneh Shemirani ◽  
Mahrouz Alvand
Keyword(s):  
Standard Deviation ◽  
Relative Standard Deviation ◽  
Crystal Violet ◽  
Water Samples ◽  
Fiber Optic ◽  
Linear Array ◽  
Solid Phase ◽  
Relative Standard ◽  
Separation And Preconcentration ◽  
Array Detection

A solid phase preconcentration procedure using SBA-3 nanosorbent for the fast separation and preconcentration of crystal violet (CV) in water samples by fiber optic-linear array detection spectrophotometry (FO-LADS) is presented. Experimental parameters including pH, sample volume, amount of sorbent, type, volume, and concentration of eluent that affect the recovery of crystal violet have been optimized. Under optimized experimental conditions, analytical parameters including limit of detection, linear working range, and relative standard deviation have also been determined. A preconcentration factor of 200 was achieved in this method. In the initial solution, the detection limit for CV was found as 1.3 μg L−1. Under optimal conditions maximum adsorption capacity was obtained as 344.83 mg g−1. Also, the relative standard deviation was less than ±1.3% (n=5). The presented procedure was applied to the determination of crystal violet in water samples (fish, fish farming water, and river water) with good results.

Eggshell Membrane Biomaterials for Adsorption and Determination of Mn(II, VII) in Environmental Water

2012 ◽  
Vol 457-458 ◽  
pp. 536-539 ◽  
Author(s):  
Rui Hua Zhang ◽  
Xiao Li Yang ◽  
Jin Liu ◽  
Xian Zhong Cheng
Keyword(s):  
Solid Phase Extraction ◽  
Water Samples ◽  
Solid Phase ◽  
Extraction Procedure ◽  
Environmental Water ◽  
Eggshell Membrane ◽  
Environmental Water Samples ◽  
Phase Extraction ◽  
Relative Standard

A simple solid phase extraction procedure for adsorption and preconcentration of manganese(II, VII) in environmental water samples has been proposed prior to inductively coupled plasma mass spectrometry. The procedure presented based on quantitative recoveries of manganese >95%. In this work, the potential use of eggshell membrane(ESM), a typical biomaterial, as solid-phase extraction (SPE) adsorbent is evaluated for analysis of trace manganese. The analytical variables, pH, flow rate, sample volume, elution, coexisting ions for optimum recoveries of manganese (II) and manganese (VII) were investigated. The preconcentration factor was 60. The detection limit (3) of manganese was 0.031 ng L-1. The relative standard deviations of determination was found to be 3.21%. The procedure was successfully applied to the adsorption and determination of manganese in environmental water samples.

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