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metals(67)
heavy metals(46)
carbon(13)
lead(12)
ph(11)
iron(10)
atmosphere(9)
geochemistry(9)
ions(8)
particulate matter(8)
nitrogen(7)
sediments(7)
absorption(6)
surface water(6)
air quality(5)
elements(5)
emissions(5)
lakes(5)
soils(5)
atmospheric chemistry(4)
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