Determination of Pd(II) in Street Dust and Water Samples by FAAS after Preconcentration with Dimethylglyoxime-Anchored Organobentonite

2012 ◽  
Vol 433-440 ◽  
pp. 24-28
Author(s):  
Dong Zhang
Keyword(s):  
Ph Value ◽  
Absorption Spectrometry ◽  
Environmental Water ◽  
Street Dust ◽  
Citrate Buffer ◽  
Flame Atomic Absorption ◽  
Experimental Parameters ◽  
Ph Range ◽  
Palladium Ion

A preconcentration method based on the adsorption of palladium-dimethylglyoxime -anchored organobentonite (DMG-bentonite) for the determination of palladium at trace levels by flame atomic absorption spectrometry (AAS) has been developed. The optimum experimental parameters for the adsorption and preconcentration of the palladium, such as pH value of medium, contact time, eluent and coexisting ion, have been investigated. The results showed that the palladium ion could be quantitatively retained by the DMG-bentonite in the pH range of 3–5 using citric acid/citrate buffer, the adsorption time was 20 min, and capability of adsorption was 8.73 mg•g-1. The palladium ion adsorbed on the DMG-bentonite could be completely eluated by using 1 mol•L-1 HCl. The detection limits of this method for palladium was 1.02µg•L-1 with an enrichment factor of 60. The method has been applied to the determination of trace amounts of palladium ion in street dust and environmental water with satisfactory results.

Determination of Trace Silver in Water by FAAS after Concentration and Separation by the Modified Organobentonite Using Dithizone

2011 ◽  
Vol 71-78 ◽  
pp. 3508-3511
Author(s):  
Dong Zhang ◽  
Yan Li Zhang
Keyword(s):  
Contact Time ◽  
Ph Value ◽  
Absorption Spectrometry ◽  
Environmental Water ◽  
Experimental Conditions ◽  
Flame Atomic Absorption ◽  
Experimental Parameters ◽  
Preconcentration Factor ◽  
Coexisting Ions

A new modified organo-bentonite using dithizone(D-O-bentonite) was used for preconcentration, separation and determination of silver(I) in natural water by flame atomic absorption spectrometry (FAAS). The experimental conditions for effective adsorption and elution of trace levels of silver (I) were optimized with respect to different experimental parameters. The influences of some common coexisting ions were also examined. The results show that the silver ion could be adsorbed on the D-O-bentonite. The adsorbed quantitively was affected by the pH value of medium and contact time. In the medium of pH 4-8, the contact time was 15 min, and capacity of the sorbent was 19.7 mg·g-1. The silver(I) adsorbed on the sorbent could be completely eluated by using 1 mol·L-1HNO3. The preconcentration factor is 100. The detection limit of the method for silver was 0.02 µg·L-1. The method was applied to the pre-concentration/separation of silver in the environmental water with satisfactory results.

Determination of Trace Heavy Metal Ions in Water by FAAS after Preconcentration with ASTO

2013 ◽  
Vol 826 ◽  
pp. 267-270
Author(s):  
En Jun Song
Keyword(s):  
Heavy Metal ◽  
Metal Ions ◽  
Heavy Metal Ions ◽  
Absorption Spectrometry ◽  
Environmental Water ◽  
Flame Atomic Absorption ◽  
Experimental Parameters ◽  
Ph Range ◽  
Coexisting Ions

A new method of preconcentration with nanometer-strontium titanate immobilized on aluminum oxide (ASTO) combined with flame atomic absorption spectrometry (FAAS) was proposed for the determination of trace heavy metal ions, included Cu2+, Ni2+ and Ag+, in environmental water. The optimum experimental parameters for preconcentration of the heavy metals studied, such as pH, shaking time, eluent and coexisting ions, have been investigated. The results showed that Cu2+, Ni2+ and Ag+, could be quantitatively retained by the ASTO in the pH range of 5-8, and then eluted completely with 2 mol·L-1 HNO3. The detection limits of this method for Cu2+, Ni2+ and Ag+ were 0.031μg·L-1, 0.15μg·L-1and0.041μg·L-1 with an enrichment factor of 50, respectively. The method has been applied to the simultaneous determination of trace amounts of Cu2+, Ni2+ and Ag+ in environmental water, the recoveries were all in 95%-105%.

Adsorption and Preconcentration Capabilities of Porous Nano-Barium-Strontium Titanate for Nickel in Water

2011 ◽  
Vol 403-408 ◽  
pp. 1141-1145
Author(s):  
Dong Zhang
Keyword(s):  
Strontium Titanate ◽  
Barium Strontium Titanate ◽  
Ph Value ◽  
Absorption Spectrometry ◽  
Flame Atomic Absorption ◽  
Barium Strontium ◽  
Determination Of Nickel ◽  
Experimental Parameters ◽  
Sorghum Straw

The adsorption capability of porous nano-barium-strontium titanate by sorghum straw template method (SBST) for nickel in water was studied. The optimum experimental parameters for the adsorption and preconcentration of the nickel, such as pH, time, eluent and coexisting ion, have been investigated. The results showed that the nickel in water could be adsorbed on the SBST. The adsorbed quantitively was affected by the pH value of medium and time. In the medium of pH 5-8, the adsorption time was 20 min, and capacity of adsorption was 13.27 mg•g-1. The adsorbed nickel could be completely eluated using 2 mol•L-1 HNO3. The pre-concentration factor for nickel was more than 100. The method has been applied to the preconcentration and flame atomic absorption spectrometry determination of nickel in water samples. The recoveries were 92.0%-104.0%.

Solid Phase Extraction and Preconcentration of Trace Gallium, Indium, and Thallium Using New Modified Amino Silica

2016 ◽  
Vol 71 (2) ◽  
pp. 288-299 ◽  
Author(s):  
Mohamed M. Hassanien ◽  
Wael I. Mortada ◽  
Ibrahim M. Kenawy ◽  
Heba El-Daly
Keyword(s):  
Solid Phase ◽  
Liquid Crystal Display ◽  
Absorption Spectrometry ◽  
Separation Process ◽  
Phase Extraction ◽  
Flame Atomic Absorption ◽  
Adsorption Capacities ◽  
Experimental Parameters ◽  
Preconcentration Factor

Amino silica gel functionalized with 2-hydroxy-5 -(2-hydroxybenzylideneamino)benzoic acid was synthesized, characterized and used as adsorbent for the removal of Ga3+, In3+ and Tl3+ from aqueous solution prior to their determination by flame atomic absorption spectrometry. Experimental parameters that affect the separation process were investigated in both batch and column modes. The maximum adsorption capacities of the sorbent are 61.7 mg g−1, 81.3 mg g−1 and 133.0 mg g−1 for Ga3+, In3+ and Tl3+, respectively. The preconcentration factor is 200 and the limits of detection of Ga3+, In3+ and Tl3+ are 4.10 μg L−1, 1.55 μg L−1 and 1.21 μg L−1, respectively. Interference by Al3+ can be masked by the addition of F−; and that of Fe3+ by its reduction to Fe2+ using 10% ascorbic acid. The method was successfully applied for the determination of these ions in water, sediments and liquid crystal display samples.

scholarly journals Flame Atomic Absorption Spectrometry Determination of Trace Amount of Cobalt (II) After Preconcentration Using Modified Analcime Zeolite Loaded with bis(2-Hydroxy-1-Naphthaldimine)N-diethylene-triamine

2009 ◽  
Vol 92 (4) ◽  
pp. 1203-1207 ◽  
Author(s):  
Tayebeh Shamspur ◽  
Ali Mostafavi
Keyword(s):  
Atomic Absorption Spectrometry ◽  
Atomic Absorption ◽  
Flame Atomic Absorption Spectrometry ◽  
Absorption Spectrometry ◽  
Original Solution ◽  
Tetradentate Schiff Base ◽  
Diethylene Triamine ◽  
Flame Atomic Absorption ◽  
Ph Range

Abstract A simple and sensitive flame atomic absorption spectrometry technique was developed for the determination of trace amounts of cobalt (Co) in various samples after adsorption on modified analcime using a recently synthesized tetradentate Schiff base ligand, bis(2-hydroxy-1-naphthaldimine)N-diethylene-triamine, by a column method in the pH range of 5 to 7, with a flow rate of 1 mL/min. The influence of flow rates of the stripping and sample solution, the amount of ligand, types of stripping, and the least amount of eluent required for elution of the Co ion from the column were investigated. The effects of interfering ions on the recovery of Co were studied. The method was successfully applied for determination of Co in water and plant samples. The maximum capacity of the modified sorbent was found to be 0.58 mg/g of Co(II); the preconcentration factor was 250. Linearity was maintained at 0.240 g/L in the original solution. The LOD was 1.44 102 g/L in the original solution.

scholarly journals Determination of Trace Amounts of Lead and Manganese in Water Samples After Simultaneous Preconcentration onto Modified Amberlite XAD-4 Resin

2009 ◽  
Vol 92 (5) ◽  
pp. 1576-1579 ◽  
Author(s):  
Sayed Zia Mohammadi Mobarakeh ◽  
Darush Afzali ◽  
Mohammad Ali Taher ◽  
Roza Dargahi
Keyword(s):  
Absorption Spectrometry ◽  
Lead Ions ◽  
Aqueous Sample ◽  
Final Solution ◽  
Standard Samples ◽  
Flame Atomic Absorption ◽  
Separation And Preconcentration ◽  
Preconcentration Factor ◽  
Ph Range

Abstract A procedure for simultaneous separation and preconcentration of trace amounts of manganese and lead has been proposed. It is based on the adsorption of manganese and lead ions onto a column of Amberlite XAD-4 resin loaded with pyrocatechol reagent. Manganese and lead were quantitatively retained on the column in the pH range 4.06.5 at a flow rate of 2 mL/min. The manganese and lead ions were eluted with 5.0 mL of 4 M HNO3 solutions. Manganese and lead were measured by flame atomic absorption spectrometry. In this case, 100.0 ng manganese and 1000.0 ng lead were concentrated in the column from 800 mL of aqueous sample, where their concentrations were as low as 0.125 and 1.25 ng/mL, respectively. Seven replicate determinations of mixtures of 1.0 g/mL manganese and 2.0 g/mL lead in the final solution gave a mean absorbance of 0.1926 and 0.0832 with RSD values of 1.1 and 1.2, respectively. The LODs were 1.76 ng/mL for Mn(II) and 37.28 ng/mL for Pb(II) (3bl/m) in the final solution, with a preconcentration factor of 160. Sensitivities for 1 absorbance for Mn(II) and Pb(II) were 7.0 and 74.7 ng/mL, respectively. The interference of a large number of anions and cations has been studied and the optimized conditions were used for determination of trace amounts of manganese and lead in various environmental and standard samples.

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