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. Author manuscript; available in PMC: 2013 Dec 6.
Published in final edited form as: Toxicol In Vitro. 2007 Apr 27;21(8):10.1016/j.tiv.2007.04.003. doi: 10.1016/j.tiv.2007.04.003

Table 1.

Chemical composition of UAPS

Chemical species % by mass
Nitrate 8.76
Sulfate 8.84
Elemental carbon 5.73
Organic carbon 47.80
Trace elements and metals* 15.88
Unknown 13.01
*

Predominant components of trace elements and metals were silicon, aluminum, iron, calcium and zinc.