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1980 (1)
1978 (2)
1Author    H.-R Schulten, R. Ziskoven, W. D. LehmannRequires cookie*
 Title    Cesium Determination in Physiological Fluids and Tissues by Field Desorption Mass Spectrometry+  
 Abstract    Quantitative ultratrace analysis (10 nmol to 10 /cmol/1) of cesium in biological samples such as human body fluids and animal tissues is performed without any prior purification or concentration steps. The normal level of cesium ions in heart cells was determined. After poisoning these cells with high concentrations of the alkali cation much higher levels were found inside the cells then had been suggested previously. It is demonstrated that field desorption mass spectrometry is a unique tool for the qualitative and quantitative investigations of metal cations in biological material. 
  Reference    Z. Naturforsch. 33c, 178 (1978); received February 20/March 8 1978 
  Published    1978 
  Keywords    Cesium, Ultratrace Determination, Biological Samples, Mass Spectrometry, Field Desorption 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0178.pdf 
 Identifier    ZNC-1978-33c-0178 
 Volume    33 
2Author    R. Ziskoven, C. Achenbach, U. Bahr, H.-R SchultenRequires cookie*
 Title    Quantitative Investigations on the Diaplacental Transfer of Thallium by Field Desorption Mass Spectrometry  
 Abstract    The placental transfer of thallium cations in pregnant mice was investigated by determining the thallium concentrations in fetal and maternal tissue 0.5 to 24 h after application of thallium. The maternal dose o f thallium was 8 mg/kg body weight throughout. Uterus and fetus were found not to differ from other organs like heart and liver in time course and magnitude of thallium uptake with an initial surge during the first few hours of exposure to thallium and a rapid decrease to steady 12 and 24 h values somewhat lower than those found in the kidney. Diaplacental transfer is therefore assumed comparatively rapid and a specific placental barrier for thallium does not seem to exist. For the determination of thallium concentrations Field Desorption Mass Spectrometry was utilized as a reliable, fast, and sensitive method for the analysis o f metal cations in biological material. This method does not require extensive pretreatment of the tissue and total sample amounts in the range of milligrams and less are sufficient for quantitative analysis. 
  Reference    Z. Naturforsch. 35c, 902 (1980); received August 8 1980 
  Published    1980 
  Keywords    Thallium, Placental Transfer, Ultratrace Determination, Mass Spectrometry, Field Desorption 
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 TEI-XML for    default:Reihe_C/35/ZNC-1980-35c-0902.pdf 
 Identifier    ZNC-1980-35c-0902 
 Volume    35 
3Author    H.-R Schulten, W. D. Lehmann, R. ZiskovenRequires cookie*
 Title    Determination of Thallium in Brain Tissue by Stable Isotope Dilution and Field Desorption Mass Spectrometry  
 Abstract    The utility of field desorption mass spectrometry for quantitative metal cation analysis in forensic sciences is demonstrated by the determination of a lethal thallium level in the brain tissue of an experimental animal. Stable isotope dilution and accumulation of the electrically recorded field desorption ion currents with a multi-channel analyzer allowed a direct estimation of thallium in homogenized tissue samples without further pretreatment. Experim ents with standard solutions revealed the limit of detection for thallium to be about 10 p g of the metal cation. 
  Reference    Z. Naturforsch. 33c, 484 (1978); received June 2 1978 
  Published    1978 
  Keywords    M ass Spectrometry, Field Desorption, M etal Cations, Isotope Dilution, Tissue Analysis 
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 TEI-XML for    default:Reihe_C/33/ZNC-1978-33c-0484.pdf 
 Identifier    ZNC-1978-33c-0484 
 Volume    33