Transformation behaviour of different platinum compounds in a clay-like humic soil: speciation investigations

Lustig, S.; Zang, Shuliang; Michalke, Bernhard; Schramel, P.; Beck, Wolfgang

doi:10.1016/0048-9697(96)05172-8

Cited by 101 publications

(45 citation statements)

References 20 publications

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“…The water-soluble fraction of Pt in tunnel dust was 3.9% and the fraction soluble in organic solvents was 3.1%, while no platinum was soluble in organic solvents for tested platinum compounds (Pt black, K 2 PtCl 4 , Na 2 PtCl 6 .6H 2 O) (Lustig et al, 1996). This indicates that the soluble species of Pt in tunnel dust are of organic character.…”

Section: Introductionmentioning

confidence: 67%

“…The solubility of Pt in tunnel dust was 52% in EDTA and 25% in thiourea, much higher than the solubility for tested platinum compounds. This means that 52% of the original metallic Pt in tunnel dust is mobile and oxidised in the soil (Lustig et al, 1996). The oxidation is most probably caused by the presence of humic soil, which contains S-attached complexones that oxidise platinum, forming insoluble compounds (Lustig et al, 1996).…”

Section: Introductionmentioning

confidence: 99%

“…Increasing platinum concentrations have been detected in environmental samples since the introduction of catalytic converters in 1984 in Europe (Nachtigall et al, 1997;Lustig et al, 1996). Metallic PGE particles in the micrometre and submicrometre range are emitted at nanograms per kilometre rates from the automobile catalyst due to surface abrasion of the washcoat during vehicle operation (Alt et al, 1993;Moldovan et al, 1999Moldovan et al, , 2002Zereini et al, 2001;Kanitsar et al, 2003).…”

Section: Introductionmentioning

confidence: 99%

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Identification of Pt and Pd bound to humic acid species in spiked soils and street dusts by size exclusion chromatography and ICP-MS

Lyubomirova

Djingova

2011

Chemical Speciation & Bioavailability

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The formation of PGE -humic acid (HA) complexes in soil and street dust samples was investigated. In order to assess the distribution of Pt and Pd among molecular weight fractions of humic substances, the HA extracts (extracted by 0.1 mol L À 1 sodium pyrophosphate) were analysed by size exclusion chromatography coupled on-line with UV-Vis detection. Similar chromatograms were obtained for soils and street dust samples (254 nm, 280 nm) and two size fractions were operationally defined as high (1600 -5000 Da) and low molecular (51600 Da) HA fractions. The concentration of Pt and Pd in the separated extracts was determined by ICP-MS. The results indicate that up to 43% of Pt is in the high molecular and up to 52% in the low molecular HA fraction. In both type of soil samples, Pd is preferentially bound to the low molecular HA fraction. Dependence of Pd -HA and Pt -HA formation on the sample type both in the soils and in the street dust sample as well as on Pt oxidation state was established. Metallic Pt shows a tendency for complexation with the fractions of HA higher than 5 000 Da. In the street dust samples, the distribution of Pt and Pd is similar and is strongly dependent on the sample type, being bound mainly to the fractions: higher than 5 000 Da, 1600 -5000 Da and the fraction lower than 1600 Da.

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Section: Introductionmentioning

confidence: 67%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Identification of Pt and Pd bound to humic acid species in spiked soils and street dusts by size exclusion chromatography and ICP-MS

Lyubomirova

Djingova

2011

Chemical Speciation & Bioavailability

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“…The study of possible organic complexes of Pt is limited to laboratory experiments with synthetic platinum compounds in different oxidation states and platinum contained in tunnel dust, used as a natural sample, added to a clay-like humic soil (Lustig et al, 1996). These results indicate the very efficient transformation of some Pt species in soils, in a relatively short time (Lustig et al, 1998).…”

Section: Introductionmentioning

confidence: 99%

“…The oxidation is most probably caused by the presence of humic soil, which contains S-attached complexones that oxidise platinum, forming insoluble compounds (Lustig et al, 1996). It was shown that the finely dispersed metallic platinum was dissolved in organic matrices, e.g.…”

Section: Introductionmentioning

confidence: 99%

Mass spectrometric techniques for characterisation of platinum–humic substance complexes in soil and street dust samples

Lyubomirova

Djingova

2013

Chemical Speciation & Bioavailability

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Increased platinum concentrations have been detected in environmental samples since the introduction of catalytic converters in Europe. It was previously believed that PGE are relatively inert and that the soluble fraction of automobile catalyst emitted PGE is only a few percent. However, new studies suggested that metallic Pt is oxidised in the soil and that the majority of the Pt species could be humic substance complexes.The aim of the present paper is the characterisation of platinum-humic acid complexes in spiked soil and street dust samples. A number of different soft ionisation mass spectrometric techniques, such as ESI-Q-MS, ESI-ION TRAP-MS and MALDI-TOF-MS have been tested. The ESI mass spectra of the soil humic acids were characterised by high complexity and irreproducibility.MALDI-TOF-MS was used for humic acid complexes characterisation in positive and negative modes. Positive ionisation was less effective and produced more simple and less informative spectra than negative ionisation. Two different MALDI matrices (CHCA, DHBA) were tested for use with humic substances. DHBA yielded better results, exhibiting superior ionisation efficiency, low spectral background and the matrix peaks were almost completely suppressed causing no interferences with identified analyte peaks. The application of MALDI-TOF-MS shows its suitability for humic substance characterisation. The comparison of the MALDI-spectra of humic acids, extracted from spiked and native soil proved that Pt undergoes transformation in the environment to humic acid complexes.

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Platinum speciation in clinical and environmental samples: Scrutiny of data obtained by using electrophoresis techniques (flatbed and capillary)

et al. 1999

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Transformation behaviour of different platinum compounds in a clay-like humic soil: speciation investigations

Cited by 101 publications

References 20 publications

Identification of Pt and Pd bound to humic acid species in spiked soils and street dusts by size exclusion chromatography and ICP-MS

Identification of Pt and Pd bound to humic acid species in spiked soils and street dusts by size exclusion chromatography and ICP-MS

Mass spectrometric techniques for characterisation of platinum–humic substance complexes in soil and street dust samples

Platinum speciation in clinical and environmental samples: Scrutiny of data obtained by using electrophoresis techniques (flatbed and capillary)

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