As I said in the other thread, see
http://www.911myths.com/html/traces_of_thermate_at_the_wtc.html which discusses elements present in the towers and contents before collapse. Section 4 identifies sources of aluminum, calcium, magnesium, sodium, sulfates, silicon, potassium, iron, titanium, carbon, molybdenum, lead, chromium, manganese and barium, so all these would be expected to be present in the debris.
Dave
So far we have the chemicals you list and the chemical contents of the human body...
Oxygen, Carbon, Hydrogen, Nitrogen, Calcium, Phosphorus, Potassium, Sulfur, Sodium, Chlorine, Magnesium, Iron, Fluorine, Zinc, Silicon, Rubidium, Strontium, Bromine, Lead, Copper, Aluminum, Cadmium, Cerium, Barium, Tin, Iodine,Titanium, Boron, Nickel, Selenium, Chromium, Manganese, Arsenic, Lithium, Cesium, Molybdenum, Mercury, etc...I think that should make my point.
So yes Dave the dust is representative but does not represent everything present.