Samuel Melaku, , Vernon Morris, Dharmaraj Raghavan, Charles Hosten
Seasonal variation of heavy metals in ambient air and precipitation at a single site in Washington, DC
Environmental Pollution, Volume 155, Issue 1, September 2008, Pages 88–98
ISSN: 0269-7491
http://www.worldcat.org/oclc/15211864



Samuel Melaku

Department of Chemistry, Howard University, 525 College Street, NW Washington, DC 20059, USA

Corresponding author. Tel.: +1 202 865 8536; fax: +1 202 806 5442.

samuelmelaku@yahoo.com



Vernon Morris

Department of Chemistry, Howard University, 525 College Street, NW Washington, DC 20059, USA



Dharmaraj Raghavan

Department of Chemistry, Howard University, 525 College Street, NW Washington, DC 20059, USA



Charles Hosten

Department of Chemistry, Howard University, 525 College Street, NW Washington, DC 20059, USA




"Abstract
Atmospheric samples of precipitation and ambient air were collected at a single site in Washington, DC, for 7 months (for ambient air samples) and 1 year (for wet deposition samples) and analyzed for arsenic, cadmium, chromium and lead. The ranges of heavy metal concentrations for 6-day wet deposition samples collected over the 1-year period were 0.20–1.3 µg/l, 0.060–5.1 µg/l, 0.062–4.6 µg/l and 0.11–3.2 µg/l for arsenic, cadmium, chromium and lead, respectively, with a precision better than 5% for more than 95% of the measurements. The ranges of heavy metal concentrations for the 6-day ambient air samples were 0.800–15.7 ng/m3, 1.50–30.0 ng/m3, 16.8–112 ng/m3, and 2.90–137 ng/m3 for arsenic, cadmium, chromium and lead, respectively, with a precision better than 10%. The spread in the heavy metal concentration over the observation period suggests a high seasonal variability for heavy metal content in both ambient air and wet deposition samples.

Keywords
Wet deposition; Ambient air; Metals"
http://www.sciencedirect.com/science/article/pii/S0269749107005313

In comparison with stated normal amounts of aluminum found in the air.

(Quote) “…..Levels of aluminum in the air generally range from 0.005 to 0.18 micrograms (1 microgram, ?g, equals a millionth of a gram, 1 gram equals 0.0022 pound) of aluminum per cubic meter of air (0.005–0.18 ?g/m3 or 0.00018 mg/L) , depending on location, weather conditions, and level of industrial activity in the area. Most of the aluminum in the air is in the form of small suspended particles of soil (dust). Aluminum levels in urban and industrial areas may be higher and can range from 0.4 to 8.0 ?g/m3 ….”
http://www.eoearth.org/view/article/155461/

or (0.008 mg/l) [ 740.00 mg/L Alu content recorded in Rain water analysis from London- in studies from Wrights Patterson Airforce Laboratory just 5.0 mg/l caused harm to cellular function in the lungs]
http://www.dtic.mil/get-tr-doc/pdf?AD=ADA445568
https://mrmaxbliss.wordpress.com/2013/08...hemtrail-files/

http://www.worldcat.org/oclc/144877