Showing papers on "Trace metal published in 1971"

Trace metal variations in sea water of the Menai Straits caused by a bloom of Phaeocystis.

Abstract: PLANKTONIC marine organisms often accumulate trace metals greatly in excess of their metabolic requirements and to concentrations 102–106 times those in sea water1. But variations in the concentration of trace metals in sea water are not usually affected unless there is a large production of plankton as there is in bloom conditions2.

Trace metal content of soils affected by base metal mining in the West of England

Abstract: The lower part of the Tamar Valley district of west Devon and east Cornwall is mineralized and there was extensive base metal mining in the nineteenth century. Soil samples were collected from pastures and gardens within and without the mineralized area. There was no regional differentiation for cobalt, iron and manganese, or iron. But within the mineralized area cadmium, copper, lead, silver and zinc contents of 41 per cent of pasture soils were abnormally high compared with the controls: this is ascribed to contamination by buried lodes and mine spoil. Most garden soils also contained anomalously high amounts of heavy metals but these may arise by processes other than mine pollution. Levels of acetic-soluble (i. e. plant available) metals correlated significantly with the corresponding total contents. These results may be significant in relation to certain diseases.

Areawide trace metal concentrations measured by multielement neutron activation analysis

Abstract: A suite of 24 hour high volume air particulate samples, collected June 11–12,1969, at 25 locations in the Northwest Indiana area, has been analyzed by nondestructive neutron activation analysis for 30 trace elements The use of Ge(Li) gamma-ray spectrometry and computer assisted data reduction, combined with 2-4 replications of each analysis, yielded precise results which allowed a study of the geographical distribution patterns of the elements Some elements, such as Na, K, Ti, Al, Sm, and Eu, show only minor concentration variations over the area,while others, such as Cu, W, Cr, Zn, Sb, Ga, Br, Ag, Fe, and Ce, show large variations, indicative of important local sources Similar distribution patterns and high correlation coefficients suggest common sources for several elements The variations of most heavy elements significantly exceed previously reported variations of total particulate, indicating the latter to be an unsatisfactory guide for elemental distribution, especially near pollution sources Th

Analysis of Trace Metal Particulates in Atmospheric Samples Using X-Ray Fluorescence

Abstract: Trace metals collected on filter paper by a hi-volume air sampler for 24 hours were analyzed using the X-ray fluorescence method A gamma ray exciting source (241Am) and a bremsstrahlung exciting source (147Pm) were both used to produce the X-rays, the latter being more efficient For the samples collected in Dayton, several metals were detected, viz: Ti, Fe, Cu, Zn, Pb, Cd, and Sn Elements in the periodic table between Ti and Cs were seen to have a sensitivity limit of 05 micrograms/m3 of air