scholarly journals CHEMICAL CHARACTERIZATION OF UNCOATED ASBESTOS FIBERS FROM THE LUNGS OF ASBESTOS WORKERS BY ELECTRON MICROPROBE ANALYSIS

1972 ◽  
Vol 20 (9) ◽  
pp. 735-740 ◽  
Author(s):  
ARTHUR M. LANGER ◽  
IVAN B. RUBIN ◽  
IRVING J. SELIKOFF ◽  
FRED D. POOLEY
Keyword(s):  
Electron Microprobe ◽  
Microprobe Analysis ◽  
Electron Microprobe Analysis ◽  
Chemical Characterization ◽  
Magnesium Content ◽  
Asbestos Fibers ◽  
Magnesium Loss ◽  
Bulk Chemistry ◽  
Asbestos Body

Lung tissues have been obtained from workmen with defined asbestos fiber exposure. These tissues have been prepared by the carbon extraction technique and examined with the electron microprobe analyzer. The uncoated fibers present in these specimens have been chemically characterized and compared with standard reference asbestos samples. The bulk chemistry of the fibers observed in lung tissues is similar to that of the reference fibers so that identification may be made. However, a statistical analysis of the measured emission characteristics from anthophyllite and amosite indicates that some magnesium loss has taken place. This loss appears to correlate with the magnesium content of the fibers. A slight iron increase was also noted in the same fibers, probably related to an incipient asbestos body formation.

Magnesio-riebeckite from the Varenche mine (Aosta Valley, Italy): crystal-chemical characterization of a grandfathered end-member

2017 ◽  
Vol 81 (6) ◽  
pp. 1431-1437 ◽  
Author(s):  
Roberta Oberti ◽  
Massimo Boiocchi ◽  
Frank C. Hawthorne ◽  
Marco E. Ciriotti
Keyword(s):  
Crystal Structure ◽  
Microprobe Analysis ◽  
Electron Microprobe Analysis ◽  
Structure Refinement ◽  
Chemical Characterization ◽  
Unit Cell Parameters ◽  
X Ray ◽  
Cell Parameters ◽  
D Values

AbstractMagnesio-riebeckite from the dumps of the abandoned mine of Varenche (45°47’22’’ N, 7°29’17’’ E), Saint-Barthélemy, Nus, Aosta Valley (Italy), was studied to provide the complete mineral description (including crystal structure) and insights into the crystal-chemistry of riebeckite. The empirical formula derived from electron microprobe analysis and single-crystal structure refinement is A(Na0.09K0.01)Σ=0.10B(Na1.77Ca0.11Mg0.08Mn2+ 0:04)Σ=2.00C(Mg2.93Mn2+0:13Fe2+0:07Zn0.01Ni0.12Fe3+1:25Al0.48Ti0.01)Σ=5.00T(Si7.92Al0.08)Σ=8.00 O22W(OH1.88F0.12)Σ=2.00. Magnesio-riebeckite is biaxial (+), with α = 1.678(2), β = 1.682(2), γ = 1.688(2) and 2V (meas.) = 80.2(1.7)°, 2V (calc.) = 78.7°. The unit-cell parameters are a = 9.6481(14), b = 17.873(3), c = 5.3013(7) Å, β = 103.630(2)°, V = 888.4 (2)Å3, Z = 2, space group C2/m. The strongest ten reflections in the powder X-ray pattern [d values (in Å), I, (hkl)] are: 2.701, 100, (151); 8.303, 83, (110); 3.079, 62, (310); 3.391, 53, (131); 4.467, 50, (040,021); 2.522, 50, (̅202); 2.578, 35, (061); 2.155, 30, (261), 4.855, 30, (̅111), 2.300, 29, (̅351).

Electron Microprobe Analysis of Ca, P, and Mg in Mandibular Bone

1970 ◽  
Vol 49 (3) ◽  
pp. 608-615 ◽  
Author(s):  
Larry J. Green ◽  
J. David Eick ◽  
William A. Miller ◽  
Jack W. Leitner
Keyword(s):  
Rhesus Monkey ◽  
Trabecular Bone ◽  
Electron Microprobe ◽  
Microprobe Analysis ◽  
Electron Microprobe Analysis ◽  
Magnesium Content ◽  
Mandibular Bone ◽  
Molar Ratios ◽  
Calcium Phosphorus ◽  
Mg Content

Calcium, phosphorus, and magnesium content and variability and CalP molar ratios in cortical and trabecular bone of the mandible of the rhesus monkey were determined with the electron microprobe. Ca, P, and Mg content was more variable in areas of trabecular bone than in areas of cortical bone. CalP molar ratios were similar in each monkey regardless of bone type.

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