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Old 28th March 2007, 06:48 PM   #6
Join Date: Mar 2007
Posts: 1,425
This is part of what I sent:

Let’s consider the evidence for molten iron at the WTC and the crucial question of molten steel in the rubble pile at Ground Zero. While this topic has been debated on many 9/11 websites, nearly all of the arguments I have seen rely on visual sightings of “molten metal” in the rubble pile - information drawn from eyewitness accounts recalled by recovery workers. This type of anecdotal evidence has been strongly criticized for its lack of scientific credibility. Remarkably, however, there is some crucial scientific evidence for the presence of molten iron or steel in the pulverized remains of WTC 1 & 2 that has apparently been completely ignored by 9/11 researchers.
I am referring to the observation of micron-sized iron spherules that have been seen in many WTC dust samples. These spherical particles are direct physical evidence that the iron within the particle was molten at the time the particle formed.

Each of the references below specifically mentions the detection of iron spherules in WTC dust samples (and in most cases also provides electron micrographs of the particles in question). Reference 1 includes two such micrographs labeled IRON-03-IMAGE and IRON-04-IMAGE. Reference 2 discusses which WTC particles could best be used as signatures of WTC dust; iron spheres were considered and rejected only because they were not found in all indoor dust samples. In reference 3 we read on page 17: “Various metals (most notably iron and lead) were melted during the WTC event, producing spherical metallic particles.” And finally in reference 4 we find a micrograph of a spherical iron particle and the comment that WTC dust contains evidence for “heat effected particles, including spherical particles.”

1. H. A. Lowers et al. “Particle Atlas of World Trade Center Dust.” USGS Open-File Report 2005-1165, (2005)

2. Various authors: “U.S. EPA Response to the Peer Review of the U.S. Environmental Protection Agency’s Final Report on the World Trade Center Dust Screening Study.” Page 28, (December 2006)

3. R. J. Lee et al. “Damage Assessment 130 Liberty Street Property: WTC Dust Signature Report on Composition and Morphology.” Issued December 2003.

4. S. R. Badger et al. “World Trade Center Particulate Contamination Signature Based on Dust Composition and Morphology.” Microscopy and Microanalysis 10 (Supplement 2), 948, (2004).

The formation of spherical iron particles has been well documented and researched for steel making processes, (See for example: Steel Research 64, 23, (1993) and Steel Research 72, 324 (2001)). Iron spheres in the 30 micron to sub-micron range are typically seen in the dust-laden off-gases produced by molten steel and are believed to be formed by the ejection of metal droplets when the liquid metal degasses.

In seeking an explanation of the formation of iron spherules during the destruction of WTC 1 & 2 it is significant that samples of WTC dust have an additional chemical signature - an enrichment of zinc. Data for iron and zinc in WTC aerosol samples have been presented by S. Qureshi and co-workers in Atmospheric Environment 40, S238, (2006). We first note that concentrations of these elements in PM2.5 aerosol collected in New York City prior to 9/11 were about 100 ng/m3 for iron and less than 20 ng/m3 for zinc. Qureshi’s data show that on September13 2001 the PM2.5 iron concentration was 127 ng/m3 and the zinc concentration was 217 ng/m3, i.e. airborne zinc concentrations were about ten times higher than normal. Qureshi’s data also show that both iron and zinc concentrations in New York’s 2.5-micron dust peaked in early October 2001 with iron at 370 ng/m3 and zinc at a remarkable 1028 ng/m3. These observations are consistent with iron and zinc data reported by the EPA for WTC air monitoring samples collected in the same post-9/11 time period.

Why was so much zinc dispersed into the air above Ground Zero? In order to answer this question we need to consider sources of zinc in the Twin Towers. A review of the construction materials in these buildings shows that the galvanized 22-gauge corrugated sheet steel, used for the decking that supported the floor concrete, was a major source of zinc. Given that 22-gauge galvanized steel has a coating of about 50 microns of zinc on a 1 mm sheet of metal comprised of ~ 98 % iron, we may use a reasonable estimate of 14 tonnes for the mass of steel decking per floor to conclude that there was about 1.4 tonnes of metallic zinc on every floor in WTC 1 & 2.
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