Investigation of the possibility of replacing high-lead glasses in fusible glass solders by less toxic glasses

2009 ◽  
Vol 66 (11-12) ◽  
pp. 381-384 ◽  
Author(s):  
D. A. Geodakyan ◽  
B. V. Petrosyan ◽  
S. V. Stepanyan ◽  
K. D. Geodakyan
Keyword(s):  
High Lead ◽  
Fusible Glass

PROMET 6

Alloy Digest ◽  
1970 ◽  
Vol 19 (7) ◽  
Keyword(s):  
Compressive Strength ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
High Lead

Abstract PROMET 6 is produced in three grades: PROMET 6, PROMET 6 SK and PROMET 6 CR. These alloys comprise a series of high-lead tin bronzes, traditionally known as the bearing bronzes. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive strength. It also includes information on corrosion resistance as well as casting, forming, heat treating, machining, and joining. Filing Code: Cu-218. Producer or source: American Crucible Products Company.

FEDERAL BRONZE 822

Alloy Digest ◽  
1976 ◽  
Vol 25 (12) ◽  
Keyword(s):  
Fracture Toughness ◽  
Compressive Strength ◽  
Physical Properties ◽  
Surface Treatment ◽  
Tensile Properties ◽  
Elevated Temperatures ◽  
Heat Treating ◽  
Copper Base ◽  
High Speeds ◽  
High Lead

Abstract FEDERAL BRONZE 822 is a copper-base, high-lead bearing bronze with superior resistance to scoring and seizure beyond the endurance and danger limits of ordinary bearing bronzes. It is used in applications involving high speeds, poor lubrication, heat-generating loads, elevated temperatures, dusty and gritty surroundings, or where a liquid other than oil is used as the lubricant. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and compressive strength as well as fracture toughness. It also includes information on casting, heat treating, machining, joining, and surface treatment. Filing Code: Cu-324. Producer or source: Federal Bronze Products Inc..

ON THE TIMING OF THE OLD COPPER COMPLEX IN NORTH AMERICA: A COMPARISON OF RADIOCARBON DATES FROM DIFFERENT ARCHAEOLOGICAL CONTEXTS

Radiocarbon ◽  
2021 ◽  
pp. 1-19
Author(s):  
David P Pompeani ◽  
Byron A Steinman ◽  
Mark B Abbott ◽  
Katherine M Pompeani ◽  
William Reardon ◽  
...  
Keyword(s):  
Native American ◽  
Lake Sediment ◽  
Copper Complex ◽  
Lake Superior ◽  
Copper Mining ◽  
Radiocarbon Dates ◽  
Copper Mines ◽  
Tool Technology ◽  
High Lead ◽  
Old Copper Complex

ABSTRACT The Old Copper Complex (OCC) refers to the production of heavy copper-tool technology by Archaic Native American societies in the Lake Superior region. To better define the timing of the OCC, we evaluated 53 (eight new and 45 published) radiocarbon (14C) dates associated with copper artifacts and mines. We compared these dates to six lake sediment-based chronologies of copper mining and annealing in the Michigan Copper District. 14C dates grouped by archaeological context show that cremation remains, and wood and cordage embedded in copper artifacts have ages that overlap with the timing of high lead (Pb) concentrations in lake sediment. In contrast, dates in stratigraphic association and from mines are younger than those from embedded and cremation materials, suggesting that the former groups reflect the timing of processes that occurred post-abandonment. The comparatively young dates obtained from copper mines therefore likely reflect abandonment and infill of the mines rather than active use. Excluding three anomalously young samples, the ages of embedded organic material associated with 15 OCC copper artifacts range from 8500 to 3580 cal BP, confirming that the OCC is among the oldest known metalworking societies in the world.

Development of Mullite Based Refractory Pot for High Lead Containing Glass Melting

2021 ◽  
pp. 1-7
Author(s):  
Sourav Nag ◽  
Sunirmal Jana ◽  
Mrinmoy Adhikary ◽  
Shibasish Barik ◽  
Alok Roy Chowdhury ◽  
...  
Keyword(s):  
Glass Melting ◽  
High Lead

The identification of high‐lead glass using simple methods

1998 ◽  
Vol 22 (1) ◽  
pp. 12-16
Author(s):  
Gerhard Eggert
Keyword(s):  
Lead Glass ◽  
High Lead

Biosynthesis of lead nanoparticles by the aquatic water fern, Salvinia minima Baker, when exposed to high lead concentration

2014 ◽  
Vol 114 ◽  
pp. 277-283 ◽  
Author(s):  
E. Castro-Longoria ◽  
K. Trejo-Guillén ◽  
A.R. Vilchis-Nestor ◽  
M. Avalos-Borja ◽  
S.B. Andrade-Canto ◽  
...  
Keyword(s):  
Lead Concentration ◽  
High Lead

Tolerance to heavy metals in Littorina saxatilis from a metal contaminated estuary in the Isle of Man

2004 ◽  
Vol 84 (2) ◽  
pp. 393-400 ◽  
Author(s):  
Erema R. Daka ◽  
Stephen J. Hawkins
Keyword(s):  
Littorina Saxatilis ◽  
Co Tolerance ◽  
Isle Of Man ◽  
Run Off ◽  
High Zinc ◽  
Lead Tolerance ◽  
Test Concentration ◽  
A Site ◽  
High Lead ◽  
Tolerance To Copper

Population differences were measured in the tolerance of Littorina saxatilis from sites around the Isle of Man, to acute exposure to zinc, lead, copper and cadmium. Animals from a site influenced by disused mine run-off in Laxey estuary (high zinc) were compared with animals from less contaminated estuaries (Peel-high lead, but lower zinc), and the relatively uncontaminated Castletown and Ramsey estuaries, plus the open coast near Derbyhaven. Median lethal times (LT50) were estimated for each test concentration (5, 10, 20 mg l−1 Zn; 5, 10 mg l−1 Pb; 0·5, 1·0, 2·0 mg l−1 Cu and Cd) except for those that did not produce sufficient mortalities. Individuals from Laxey estuary showed significantly higher tolerances to zinc (10 mg l−1) and lead (5 mg l−1) than animals from the unpolluted sites. No co-tolerance to copper or cadmium was apparent. Population tolerance to zinc was correlated with reduced accumulation rates. Lead tolerance may result from the ability of the tolerant individuals to sequester the metal and detoxify it in their tissues; the littorinids from Laxey had significantly higher rates of lead accumulation.

scholarly journals Influence of fixation procedures on the microanalysis of lead-induced intranuclear inclusions in rat kidney.

1990 ◽  
Vol 38 (3) ◽  
pp. 331-337 ◽  
Author(s):  
D F Vandeputte ◽  
W A Jacob ◽  
R E Van Grieken
Keyword(s):  
Osmium Tetroxide ◽  
Lead Concentration ◽  
Rat Kidney ◽  
Kidney Tissue ◽  
Element Distribution ◽  
Intranuclear Inclusions ◽  
Transmission Electron ◽  
Wet Chemical ◽  
High Lead ◽  
Laser Microprobe Mass Analysis

Using Laser Microprobe Mass Analysis (LAMMA), we studied the chemical composition of lead-induced intranuclear inclusions in rat kidney tissue prepared by three different wet chemical fixation procedures for transmission electron microscopy. Fixation with glutaraldehyde-Na2S gave the same results as fixation with glutaraldehyde only: a high lead concentration could be detected. Therefore, for lead strongly bound to proteins, precipitation procedures are not essential. Post-fixation with osmium tetroxide drastically changed the composition of the inclusions: the lead concentration decreased substantially, while sodium, calcium, and barium were introduced. The osmium tetroxide fixative was found to be the source of the contamination. It also contained aluminum, and we suggest that other proteins (e.g., in neurofibrillary tangles) might be able to take up Al out of solution and that care must be exercised in interpreting the microanalytical results of osmium-fixed material. For the microanalysis of the lead inclusions, fixation with glutaraldehyde only provides a good compromise between preservation of the ultrastructure and maintenance of the element distribution.

Sign in / Sign up

Export Citation Format

Share Document