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%.

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.

Column Preconcentration and FAAS Determination of Heavy Metal Ions using Artemisia Siberi as an Adsorbent

2014 ◽  
Vol 97 (6) ◽  
pp. 1707-1712 ◽  
Author(s):  
Hassan Zavvar Mousavi ◽  
Jalal Derakhshankhah
Keyword(s):  
Heavy Metal ◽  
Flame Atomic Absorption Spectrometry ◽  
Present Method ◽  
Heavy Metal Ions ◽  
Absorption Spectrometry ◽  
Sample Volume ◽  
Flame Atomic Absorption ◽  
Column Procedure ◽  
Column Preconcentration

Abstract A new column procedure for the determination of trace amounts of cadmium (II), lead (II), nickel (II), zinc (II), and copper (II), which combines flame atomic absorption spectrometry is described. These metals were sorbed on Artemisia siberi herb as an adsorbent at pH 4.0 and eluted with 3 mL of 1.5 M HNO3. The influences of analytical parameters including pH, flow rate, sample volume, type of eluent, and effect of diverse salts and cations on the recoveries of analyte ions were studied. The developed procedure provides preconcentration factors of about 117. LODs were 0.2 (Cd), 0.4 (Cu), 0.2 (Ni), 0.6 (Zn), and 1.4 (Pb) μg/L. The present method was successfully applied to the determination of the above-mentioned ions in water samples from Semnan, Iran. Recoveries greater than 95% and RSDs below 10% were obtained.

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