Contents and main fractions of trace elements in Typic Argiudolls of the Argentinean Pampas

Authors: Lavado, Raúl S.; Porcelli, Claudia A.

Source: Chemical Speciation and Bioavailability, Volume 12, Number 2, May 2000 , pp. 67-70(4)

Publisher: Science Reviews 2000 Ltd

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Abstract:

The knowledge of the trace elements in soils of the Pampas remains fragmentary. Agriculture has been intensified in this region increasing the crop demand of micronutrients and increasing the use of fertilizers, which could add measurable quantities of trace elements to soils. We analysed the status of 12 trace elements in three soil fractions of different availability. Typic Argiudolls (soil taxonomy) from six locations of northern Buenos Aires province were sampled. Arsenic (As), cadmium (Cd), chromium (Cr), cobalt (Co), copper (Cu), iron (Fe), lead (Pb), manganese (Mn), molybdenum (Mo), nickel (Ni) and zinc (Zn) were extracted with DTPA, with 2N HNO₃ and with HCl-HNO₃-H₂SO₄ and HClO₄. The exceptions were bioavailable boron (B), extracted with hot water, and total B and Cr, determined through instrumental neutron activation analysis. The analysis of the other elements were performed by inductively coupled plasma-atomic emission spectrometry. The total contents were similar or below values found in other soils of the region. Extractable DTPA Zn, Cu and Fe were within the range of variation for the region but Mn data were lower than those found previously in the area. As, B, Co, Cr, Fe, Mo, Pb and Zn predominated in chemical forms which are almost insoluble for plants. Our results broaden the previous information for micronutrients in the Pampean region. For heavy metals, our results corroborate the lack of soil contamination in rural areas of the Pampas.

Keywords: trace elements; bioavailatity; Argiudolis; micronutrients; heavy metals

Document Type: Research article

DOI: http://dx.doi.org/10.3184/095422900782775553

Affiliations: 1: Departamento de Suelos. Facultad de Agronomía, Universidad de Buenos Aires. Av. San Martín 4453, 1417 Buenos Aires, Argentina

Publication date: 2000-05-10

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Chemical Speciation & Bioavailability covers a rapidly expanding area in environmental science.
Research on the interactions between the chemical forms and behaviour of toxic compounds and their subsequent biological uptake, metabolism and ecological fate involves many scientific fields. These studies are often published in discipline-specific journals, leading to inadequate review and information scatter. This situation hinders both the development of an international community of experienced colleagues and the open flow of information and discussion. Additionally, the importance of speciation and bioavailability research to the development of pollution law and control technologies is being increasingly appreciated by environmental regulatory agencies throughout the world.
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Contents and main fractions of trace elements in Typic Argiudolls of the Argentinean Pampas

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