Reductive coprecipitation as a separation method for the determination of gold, palladium, platinum, rhodium, silver, selenium and tellurium in geological samples by graphite furnace atomic absorption spectrometry

Niskavaara, Heikki; Kontas, E.

doi:10.1016/s0003-2670(00)86426-0

Cited by 90 publications

(25 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…10 Combined digestion procedures, a wet acid treatment followed by alkaline oxidizing fusion of an undissolved residue, are often applied for improving the recovery of the metals. [74][75][76] The use of hydrofluoric acid in the digestion procedures is preferable, particularly when examining geological 74,[76][77][78][79][80][81][82][83][84][85] and environmental materials. 72,[86][87][88][89][90][91][92][93][94] High-pressure systems and microwave heating are widely applied for improving the digestion of such samples.…”

Section: Wet Acid Treatmentmentioning

confidence: 99%

Sample Digestion Methods for the Determination of Traces of Precious Metals by Spectrometric Techniques

Balcerzak

2002

ANAL. SCI.

168

View full text Add to dashboard Cite

Recent advances in digestion methods used in the analysis of precious metal samples by spectrometric techniques are reviewed. The applicability of a fire assay, a wet acid treatment, chlorination and alkaline oxidizing fusion to a quantitative recovery of metals from various materials is discussed. Data on the precious metal contents obtained by using particular digestion methods as well as UV-VIS spectrophotometry, atomic absorption spectrometry, atomic emission spectrometry and inductively coupled plasma mass spectrometry in the examination of various samples are tabulated.

show abstract

Section: Wet Acid Treatmentmentioning

confidence: 99%

Sample Digestion Methods for the Determination of Traces of Precious Metals by Spectrometric Techniques

Balcerzak

2002

ANAL. SCI.

168

View full text Add to dashboard Cite

show abstract

“…The basic principle of SPE is the transfer of analytes from aqueous phase to the active sites of solid phase. A number of supports and chelating ligands have been widely used for the preconcentration and separation of trace metal ions from various matrices [11][12][13][14][15][16][17][18][19] . Activated carbon (AC) has the ability to absorb both organic and inorganic compounds.…”

Section: Introductionmentioning

confidence: 99%

Determination of Some Heavy Metals in Real Samples by FAAS after Preconcentration on 4-Nitro-2-(2-nitro-phenelazo)phenol Modified Activated Carbon

Sarrafi

Konoz²,

Khanmohammadi³

2012

Chem Sci Trans

View full text Add to dashboard Cite

A sensitive and simple method for determination of some heavy metals by flame atomic spectrometry after simultaneous preconcentration of trace heavy metals ions in some cereal and vegetable samples has been reported. The method is based on the adsorption of Cu 2+ , Fe 2+ , Zn 2+ and Pb 2+ on 4-nitro-2-(2-nitro-phenelazo)phenol (NNPP) loaded on activated carbon (AC). The adsorbed metals on activated carbon were eluted using 3 mL 4 mol L -1 nitric acid. The influences of the analytical parameters including pH, flow rate of sample and eluent, type and concentration of eluent, amount of adsorbent and sample volume were investigated. The recoveries of analytes were generally higher than 95%.

show abstract

“…5,6 So far, several methods for preconcentration and separation of trace amount of metals from various samples have been developed and used according to nature of the sample. 7 Liquid-liquid microextraction, 8 liquid-liquid extraction, 9,10 membrane disk extraction, 11 coprecipitation, 12,13 cloud point extraction, 14,15 leaching, 16 cyanidation, 17,18 adsorption process 19 and solid phase extraction (SPE) [20][21][22][23] are the most popular methods for this aim. Among these techniques, SPE is one of the most important preconcentration methods because of its simplicity, flexibility of choice of the solid phase, high preconcentration factor, low consumption of the organic solvents, low cost and extraction time for sample preparation.…”

Section: Introductionmentioning

confidence: 99%

Flame Atomic Absorption Spectrometric Determination of Palladium in Aqueous Samples after Preconcentration Using Nanoparticles of γ-Alumina Functionalized with Pyridine Groups

et al. 2010

View full text Add to dashboard Cite

Experimental ApparatusA flame atomic absorption spectrometer (FAAS), Shimadzu AA-680 equipped with a single element palladium hollow cathode lamp (current 6.0 mA) was used for determination of palladium(II). The operating conditions were as follows: wavelength 244.8 nm, which is the resonance line for palladium; acetylene/air flow rate, 4.7 L min -1 ; and 0.5 nm for spectral 2010 © The Japan Society for Analytical Chemistry † To whom correspondence should be addressed. A new solid phase, nanoparticles of alumina functionalized with pyridine groups, was synthesized and used for extraction and preconcentartion of palladium(II) ions from some water samples. The effects of various parameters such as pH, flow rates of sample and eluent, type and volume and concentration of eluent, sample volume, amount of adsorbent and cationic interferences have been studied and optimum conditions for best recovery have been obtained. The limit of detection of the method based on three times the standard deviation of the blank (3Sb) was obtained: 0.6 ng mL -1 . The preconcentration factor and the adsorption capacity were also calculated to be 60 and 37 mg g -1 , respectively. The recovery of extraction of palladium ions on nano-alumina particles was determined to be 98.5%. The utility of the modified nano-alumina was tested in some samples and showed an RSD value of <0.8%, reflecting its accuracy and reproducibility.

show abstract

Reductive coprecipitation as a separation method for the determination of gold, palladium, platinum, rhodium, silver, selenium and tellurium in geological samples by graphite furnace atomic absorption spectrometry

Cited by 90 publications

References 23 publications

Sample Digestion Methods for the Determination of Traces of Precious Metals by Spectrometric Techniques

Sample Digestion Methods for the Determination of Traces of Precious Metals by Spectrometric Techniques

Determination of Some Heavy Metals in Real Samples by FAAS after Preconcentration on 4-Nitro-2-(2-nitro-phenelazo)phenol Modified Activated Carbon

Flame Atomic Absorption Spectrometric Determination of Palladium in Aqueous Samples after Preconcentration Using Nanoparticles of γ-Alumina Functionalized with Pyridine Groups

Contact Info

Product

Resources

About