Determination of platinum, palladium and rhodium in Pt-catalysts by high performance thin layer chromatography using densitometry

Aygün, R. Sezer; Merdıvan, Melek; Külcü, Nevzat

doi:10.1007/bf01242728

Cited by 8 publications

(2 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…N,N-diethyl-N′-benzoylthiourea (DEBT) and N,N-dibutyl-N′-benzoylthiourea (DBBT) have been used for preconcentration of several transition metals (Merdivan et al 2000), actinide ion (Merdivan et al 2001) and some platinum group metals (Aygun et al 1997;Philippeit and Angerer 2001). So, it was attractive to study the impregnation of DBBT ligand to polystrene-divinylbenzene polymeric resin.…”

Section: Introductionmentioning

confidence: 99%

Solid phase extractive preconcentration of silver from aqueous samples

Ayata

Kaynak

Merdıvan

2008

Environ Monit Assess

Self Cite

View full text Add to dashboard Cite

N,N-dibutyl-N1-benzoylthiourea (DBBT) impregnated onto a polymeric matrix, Amberlite XAD-16 was prepared. The separation and enrichment of Ag(I) from solution was investigated. Effective extraction conditions were optimized in column methods prior to determination by atomic absorption spectrometry. The optimum pH range for quantitative adsorption is 2-5. Quantitative recovery of Ag was achieved by stripping with 1 mol L(-1) thiourea in 1 mol L(-1) HCl. The sorption capacity of resin is 0.115 mmol Ag+ g(-1) resin. The relative standard deviation and detection limit was 3.1% for 1 microg Ag+ mL(-1) solution and 0.11 microg L(-1), respectively. The method was used for the determination of silver in geological water samples.

show abstract

Section: Introductionmentioning

confidence: 99%

Solid phase extractive preconcentration of silver from aqueous samples

Ayata

Kaynak

Merdıvan

2008

Environ Monit Assess

Self Cite

View full text Add to dashboard Cite

show abstract

“…Most separations have so far focused on the complexes of porphyrins with metal ions using high performance liquid chromatography and high performance thin layer chromatography; [13][14][15][16][17] only a few papers have been presented involving the quantitative analysis of metals using chelating agents by HPTLC. [18][19][20][21] The purpose of this study was to develop a fast, selective, cheap, and simple possible method of separation and simultaneous determination of mercury, zinc, copper, and cobalt in aqueous solutions by HPTLC with the basis of solid phase extraction using TBHPP, TPPP or CMPP ( Figure 1) as complexing agents. By this proposed method, the analysis of metal ions in water and food samples has also been successful.…”

Section: Introductionmentioning

confidence: 99%

Determination of Trace Metal Ions Using Porphyrins as Chelating Agents by High Performance Thin Layer Chromatography-Densitometry

Bozkurt

Çavdar

Kurtbay

et al. 2010

Journal of Liquid Chromatography & Related Technologies

Self Cite

View full text Add to dashboard Cite

& A method was developed for separation and quantitative determination of mercury, copper, cobalt, and zinc as porphyrin complexes using newly synthesized tetra-(3-bromo-4-hydroxyphenyl) porphyrin (TBHPP), tetra-(4-phenoxyphenyl) porphyrin (TPPP) and tetra-p-chloromethylphenyl porphyrin (CMPP) in aqueous medium by HPTLC densitometry. The method involves enrichment of metal ions as metal complexes with octadecyl cartridges and elution using tetrahydrofuran. The analysis was performed on HPTLC silica gel plates with acetone-chloroform (2:8, v=v) as the mobile phase for TBHPP and TPPP quantification and dichloromethane-chloroform-hexane (1:1:3, v=v) for CMPP quantification. Quality parameters were confirmed and detection limits were ranged from 0.16 to 0.92 ng lL À1 . Detection was performed densitometrically in absorption-reflection mode around 420 nm. The method was found to be simple, precise and accurate for the determination of these metal ions in water and food sample.

show abstract

Noble Metals, Analytical Chemistry of

Balcerzak

2000

Encyclopedia of Analytical Chemistry

View full text Add to dashboard Cite

Analytical methods for the determination of noble (precious) metals: ruthenium (Ru), rhodium (Rh), palladium (Pd), osmium (Os), iridium (Ir), platinum (Pt) and gold (Au) are presented in this article. Discovery, natural occurrence and main applications of the metals are described. Physical and chemical properties of noble metals are summarized. The nobility and catalytic activity of precious metals are the main properties that allow their use in a wide variety of applications, e.g. as catalysts in various chemical processes, as autocatalysts, in the electrical and electronic industry and in jewellery. Recent applications of some platinumcompounds (cisplatin and its derivatives) as anticancer drugs are important. The large variety of complex matrices, wide analytical concentration range (from sub‐ppb to >99.99%), low reactivity towards single chemical reagents, great chemical similarities (especially between the pairs Ru and Os, Rh and Ir, Pt and Pd), complexity of platinum group metals (PGMs) species in solutions and rates of reaction make the accurate determination of noble metals a difficult analytical problem. The use of direct instrumental methods is restricted owing to interferences caused by matrix elements and low analyte concentrations. Sampling, sample decomposition, separation and preconcentration are critical steps in the majority of analytical procedures used. The choice of the digestion procedure used depends on the nature of the sample matrix and the analyte concentration. Fire assay (lead, iron, copper, nickel, tin or nickel sulfide as collectors), oxidizing fusion, acids treatment and chlorination are used to digest various materials. Precipitation, solvent extraction and chromatographic methods (ion‐exchange and chelating resins, capillary electrophoresis) are applied to separate noble metals from associated base metals and to separate the individual precious metals. Preliminary isolation of ruthenium and osmium from the other noble and base metals, as well as from each other, by distillation or extraction in the form of RuO 4 and OsO 4 , is often applied. Spectrophotometric methods using the complexes with inorganic and organic reagents can be applied to the determination of precious metals at ppm levels. Atomic absorption spectroscopy (AAS) (flame and graphite furnace) is well suited to the determination of Au, Pd, Rh and Pt (ppm and ppb levels, respectively). Ultratraces (ppb and sub‐ppb levels) of noble metals can be determined in a large number of complex matrices by inductively coupled plasma mass spectrometry (ICPMS) with or without separation and preconcentration steps. A wide range of PGM concentrations, from percentage to ppm levels, can be determined by X‐ray fluorescence (XRF) directly in solid samples or after pretreatment procedures (fire assay, coprecipitation, chromatographic preconcentration). Nuclear techniques (mainly neutron activation) are favored for the determination of low (ppb and sub‐ppb) levels of precious metals (high sensitivities for Au, Ir, Pd and Os) in geological samples. Voltammetric measurements in combination with sample preparation, including the transformation of noble metals into electrochemically active compounds, provide high sensitivity (ppm and ppb levels) for the determination. The use of standard reference materials is essential to check the accuracy of the results obtained by various analytical techniques.

show abstract

Determination of platinum, palladium and rhodium in Pt-catalysts by high performance thin layer chromatography using densitometry

Cited by 8 publications

References 10 publications

Solid phase extractive preconcentration of silver from aqueous samples

Solid phase extractive preconcentration of silver from aqueous samples

Determination of Trace Metal Ions Using Porphyrins as Chelating Agents by High Performance Thin Layer Chromatography-Densitometry

Noble Metals, Analytical Chemistry of

Contact Info

Product

Resources

About