By Horatio R. Velasquez
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Extra resources for Pollution Control: Management, Technology and Regulations (Air, Water and Soil Pollution Science and Technology)
The measurements of plant concentration in this study corresponded to the growth form of above-ground tissue, predominantly herb and graminoid. Once the concentration in plant is estimated, the uptake rate is calculated by multiplying the plant content and the production rate (pasture in this case), being the units of the result in g ha-1 y-1. In order to transform these units into y-1, it is necessary to refer plant uptake rate (Rp) to the initial concentrations of metal in soil. The values of all the parameters needed for assessing metal accumulation are shown in Table 1.
Phytoaccumulation of trace elements by wetland plants: I. Duckweed. Journal of Environmental Quality, 27, 715721. , 2004. Phytoavailability and fractionation of copper, manganese, and zinc in soil following application of two composts to four crops. Environmental Pollution, 131, 187-195. , 2005. Copper and Zn uptake by radish and pakchoi as affected by application of livestock and poultry manures. Chemosphere, 59, 167-175. R. Velasquez, pp. 43-82 ISBN: 978-1-61668-584-3 © 2011 Nova Science Publishers, Inc.
Contamination? Natural and Anthropic Stressors… 47 The rivers of “Del Plata” irrigate the lands of southern Brazil, Bolivia, Uruguay, Paraguay and Argentina, and all types of effluents (treated or no-treated) are deposited into these rivers. g. Iguazu, Pilcomayo, Bermejo, Salado). These rivers are mainly feed by rainfall, except those that originate in the Andes Mountains . Large cities and farmland occur throughout the paths of these rivers where herbicides, insecticides and fungicides are applied and industries use heavy metals or petroleum products.