TUTDoR

Okonkwo, J. O. | XML Document

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Date: 2012-06-01
Type: Text
Identifier: tut:1422
Description: The concentration of mercury vapour in ambient air is routinely determined using specialised instruments. As an economical alternative, actively pumped Hopcalite sorbent tubes can be used to trap atmo ... More
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Date: 2008-08-25
Type: Text
Identifier: tut:1582
Description: Parmotrema austrosinense (Zahlbr.) Hale lichens were collected from the Pretoria central business district (CBD), as well as three sites to the east of Pretoria; the National Botanical Gardens, the CS ... More
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