24 Result(s)
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Article
B. Michalke
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Article
Calculation of internal dose from ingested soil-derived uranium in humans: Application of a new method
The aim of the present study was to determine the internal dose in humans after the ingestion of soil highly contaminated with uranium. Therefore, an in vitro solubility assay was performed to estimate the bio...
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Manganese speciation in paired serum and CSF samples using SEC-DRC-ICP-MS and CE-ICP-DRC-MS
Occupational manganese (Mn) overexposure leads to accumulation in the brain and has been shown to cause progressive, permanent, neuro-degenerative damage with syndromes similar to idiopathic Parkinsonism. Mn i...
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Enhanced extract preparation of native manganese and iron species from brain and liver tissue
To date, no reference method for the extraction of labile Mn species from biological tissues is published which provides sufficient extraction efficiency combined with monitoring speciation. Here, an extractio...
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Bioavailability of zinc from NutriSet zinc tablets compared with aqueous zinc sulfate
The apparent widespread extent of zinc (Zn) deficiency in develo** countries and the efficacy of oral Zn supplements as an adjunct to oral rehydration therapy make oral Zn supplementation an increasingly imp...
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Levels of Toxic Metals in Multisectoral Samples from Winam Gulf of Lake Victoria
In this study, the distribution and sources of inputs of trace metals including Cd, Cu, Zn and Pb from various sources as well as Fe which is widely used in the construction industry, into Winam Gulf of Lake V...
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Identification and quantification of metallothionein isoforms and superoxide dismutase in spiked liver extracts using HPLC-ESI-MS offline coupling and HPLC-ICP-MS online coupling
A two-dimensional chromatographic method for the characterization of metallothionein isoforms (MT) and superoxide dismutase (SOD) in spiked liver extracts was developed for the optimization of extraction proc...
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Effect of different extraction procedures on the yield and pattern of Se-species in bacterial samples
Investigations are described to extract Se-species from a bacterial sample. The five extraction methods investigated were: hot water, protease, lysozyme, lysozyme-protease, and HCl hydrolysis. The extraction ...
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Iodine species and the endocrine system: thyroid hormone levels in adult Danio rerio and develo** Xenopus laevis
Recently a new approach for the analysis of iodinated organic species in human serum has been developed using liquid chromatography–inductively coupled plasma–mass spectrometry (LC–ICP–MS). This method enable...
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Second International Conference on Trace Element Speciation in Biomedical, Nutritional and Environmental Sciences
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First International Conference on Trace Element Speciation in Biomedical, Nutritional and Environmental Sciences
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Capillary electrophoresis/electrospray ionization mass spectrometry (CE/ESI-MS) as a powerful tool for trace element speciation
The on-line coupling of capillary electrophoresis (CE) and electrospray ionization mass spectrometry (ESI-MS) for speciation analysis is entailed with a number of difficulties due to technical and methodical ...
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Quality control and reference materials in speciation analysis
This contribution describes the need and some strategies for a rigid quality control in speciation analysis. Firstly, the term “chemical speciation” is defined and differentiated from experimental concepts no...
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Capillary electrophoresis coupled to inductively coupled plasma mass spectrometry (CE/ICP-MS) and to electrospray ionization mass spectrometry (CE/ESI-MS): An approach for maximum species information in speciation of selenium
On-line hyphenations consisting of a separation and a detection step are one of the most efficient techniques for identification and characterization of metal containing species. The high resolution power of ...
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The capability of ultrafiltration and ETV-ICP-MS for size fractionation studies of arsenic and selenium species in ground water samples with high concentrations of iron, manganese and sulfur
A simple, but highly sensitive procedure for the determination of particular and colloidally bound arsenic and selenium species in ground water samples with high concentrations of iron, manganese and sulfur i...
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A new method for the analysis of arsenic species in urine by using HPLC-ICP-MS
Urinary arsenic speciation is considered to be an effective procedure to differentiate between toxic inorganic and less toxic organic arsenic exposure. The aim of the present work was to develop a new method ...
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Platinum speciation with hyphenated techniques: high performance liquid chromatography and capillary electrophoresis on-line coupled to an inductively coupled plasma-mass spectrometer – application to aqueous extracts from a platinum treated soil
1. An on-line hyphenation of reversed phase high-performance liquid chromatography (RP-HPLC) with inductively coupled plasma-mass spectrometry (ICP-MS) is applied, using an ultrasonic nebuliser combined with ...
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Platinum determination in nutrient plants by inductively coupled plasma mass spectrometry with special respect to the hafnium oxide interference
Platinum, emitted from automobile exhaust catalysts, is mainly oxidised in a humic soil, as described previously [1]. An experiment with nutrient plants was carried out to elucidate the bioavailability and ac...
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Coupling of capillary electrophoresis with ICP-MS for speciation investigations
An online hyphenation of capillary electrophoresis (CE) with inductively coupled plasma-mass spectrometry (ICP-MS) is developed, using a homemade nebulizer as the interface. The high resolution power of CE is...
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Determination of free iodide in human serum: Separation from other I-species and quantification in serum pools and individual samples
A method for the determination of free iodide in human serum was developed. For this purpose iodide from pooled serum samples was separated from the organic manner by SEC. The iodide fraction subsequently was ...
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Separation of free iodide from other I-species in human serum – Quantification in serum pools and individual samples
A method for the determination of free iodide in human serum has been developed. Iodide from pooled serum samples has been separated from the organic matter by SEC, subsequently freeze-dried and analyzed by io...
