Determination of textra-alkyl lead vapour and inorganic lead dust in air

The Analyst ◽  
1966 ◽  
Vol 91 (1084) ◽  
pp. 428 ◽  
Author(s):  
R. Moss ◽  
E. V. Browett
Keyword(s):  
Inorganic Lead ◽  
Lead Dust

Field Method for the Determination of Inorganic Lead Fumes in Air

AIHAJ ◽  
1959 ◽  
Vol 20 (2) ◽  
pp. 134-137 ◽  
Author(s):  
Enrique A. Quino
Keyword(s):  
Field Method ◽  
Inorganic Lead

Sources of Error in Determining Lead in Blood by Atomic Absorption Spectrophotometry

1974 ◽  
Vol 20 (2) ◽  
pp. 205-211 ◽  
Author(s):  
Louis E Kopito ◽  
Michael A Davis ◽  
Harry Shwachman
Keyword(s):  
Atomic Absorption ◽  
Direct Analysis ◽  
Atomic Absorption Spectrophotometry ◽  
Lead In Blood ◽  
Sources Of Error ◽  
Inorganic Lead ◽  
Analytical Procedures

Abstract 203Pb was used to monitor sample-preparation techniques used in four atomic absorption methods for determination of lead in blood. Sources of error and their magnitude were identified and measured for each of the following analytical procedures: precipitation with trichloroacetic acid, separation with ammonium pyrrolidine dithiocarbonate into methyl isobutyl ketone, digestion with acids, and coprecipitation with bismuth and direct analysis after a "nonextraction" procedure. The determination of lead in blood supplemented with inorganic lead was compared with that of naturally bound lead obtained from experimentally poisoned animals. Because of differences in in vivo and in vitro lead binding, recovery of added inorganic lead may not accurately reflect the fate of endogenous lead in some analytical procedures.

Galactic orbits of stars

1966 ◽  
Vol 25 ◽  
pp. 93-97
Author(s):  
Richard Woolley
Keyword(s):  
Globular Cluster ◽  
Potential Field ◽  
High Velocity ◽  
Velocity Vector ◽  
Variable Stars ◽  
The Sun ◽  
Proper Motions ◽  
Rr Lyrae ◽  
The Galaxy

It is now possible to determine proper motions of high-velocity objects in such a way as to obtain with some accuracy the velocity vector relevant to the Sun. If a potential field of the Galaxy is assumed, one can compute an actual orbit. A determination of the velocity of the globular clusterωCentauri has recently been completed at Greenwich, and it is found that the orbit is strongly retrograde in the Galaxy. Similar calculations may be made, though with less certainty, in the case of RR Lyrae variable stars.

Distance to SN 1987A and the LMC

1999 ◽  
Vol 190 ◽  
pp. 549-554
Author(s):  
Nino Panagia
Keyword(s):  
Angular Size ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Light Curves ◽  
Distance Modulus ◽  
Absolute Size ◽  
Sn 1987A

Using the new reductions of the IUE light curves by Sonneborn et al. (1997) and an extensive set of HST images of SN 1987A we have repeated and improved Panagia et al. (1991) analysis to obtain a better determination of the distance to the supernova. In this way we have derived an absolute size of the ringRabs= (6.23 ± 0.08) x 1017cm and an angular sizeR″ = 808 ± 17 mas, which give a distance to the supernovad(SN1987A) = 51.4 ± 1.2 kpc and a distance modulusm–M(SN1987A) = 18.55 ± 0.05. Allowing for a displacement of SN 1987A position relative to the LMC center, the distance to the barycenter of the Large Magellanic Cloud is also estimated to bed(LMC) = 52.0±1.3 kpc, which corresponds to a distance modulus ofm–M(LMC) = 18.58±0.05.

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