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Digitale Medien

Investigations of trace elements in high salinity waters by ICP-MS (1999)

Klemm, W. ; Bombach, G. ; Becker, K. P.

Springer

Fresenius' journal of analytical chemistry 364 (1999), S. 429-432

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ISSN: 1432-1130

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Abstract A separation and enrichment procedure for the analysis of trace elements (Cd, Co, Cu, Fe, Mn, Ni, Pb, Tl, U, Zn) in seawater or brines from ore dumps by ICP-MS was established based on the complexation with sodium diethyldithiocarbamate-trihydrate (Na-DDTC) and separation on a phenyl column. The method was tested with seawater samples from the hydrothermal system of Axial Seamount, Juan de Fuca Ridge. The analytical results demonstrated the influence of hydrothermal activity on the concentration of Fe and Mn.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/s002160051362

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Digitale Medien

Cyclic changes in volatile constituents of bovine vaginal secretions (1995)

MA, Weidong ; Clement, B. A. ; Klemm, W. R.

Springer

Journal of chemical ecology 21 (1995), S. 1895-1906

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ISSN: 1573-1561

Schlagwort(e): Cow ; vaginal secretions ; estrus ; pheromones ; acetaldehyde ; gas chromatography

Quelle: Springer Online Journal Archives 1860-2000

Thema: Biologie , Chemie und Pharmazie

Notizen: Abstract Headspace gas chromatography was used to examine the volatile components of bovine vaginal secretions in three consecutive estrous cycles from each of four cows. Results indicated that there was an interesting peak with a retention of 2.7 min. It showed a successive rise and fall zero to three days before estrus. Gas chromatographic evidence and mass spectral data confirmed that this peak was acetaldehyde. Another unidentified compound with a retention time of 27 min was found to be unique to proestrus. It occurred two to three days prior to estrus, but was absent at any other time of the cycle.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF02033850

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Digitale Medien

Trace element determination in contaminated sediments and soils by ultrasonic slurry sampling and Zeeman graphite furnace atomic absorption spectrometry (1995)

Klemm, W. ; Bombach, G.

Springer

Fresenius' Zeitschrift für analytische Chemie 353 (1995), S. 12-15

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ISSN: 1618-2650

Quelle: Springer Online Journal Archives 1860-2000

Thema: Chemie und Pharmazie

Notizen: Abstract Ultrasonic suspension of powder samples in combination with graphite furnace atomic absorption spectrometry (GFAAS) has been proven to be a promising method for the analysis of the total content of As, Cd, Cr, Cu, Ni and Pb in sediments and soils. The samples have been ground to a grain size 〈63 μm. The calibration has been carried out with aqueous solutions of the analytes, with the exception of Cr which requires a calibration with suspensions of a suitable reference sample. The reproducibility has been slightly lower than for measurements obtained with solutions. Advantages are the considerable simplification of the sample preparation and the reduction of blank values. Comparative analyses have shown a good agreement of the results with those obtained by other methods.

Materialart: Digitale Medien

URL: http://dx.doi.org/10.1007/BF00322883

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