Publicaciones 2011-2020

@article{RN162,
title = {Comparative Measurements and Their Compliance with Standards of Total Mercury Analysis in Soil by Cold Vapour and Thermal Decomposition, Amalgamation and Atomic Absorption Spectrometry},
author = { M.A. Leiva and S. Morales and R. Segura},
url = {/brokenurl#<Go to ISI>://WOS:000315281300006},
doi = {10.1007/s11270-012-1390-3},
issn = {0049-6979},
year = {2013},
date = {2013-01-01},
journal = {Water Air and Soil Pollution},
volume = {224},
number = {2},
abstract = {Two methods to measure mercury concentration in soil are compared, and their compliance with international standards is determined: cold vapour atomic absorption spectrometry and thermal decomposition, amalgamation and atomic absorption spectrophotometry. The detection limit, quantification limit and uncertainty of these two analytical methods were evaluated and compared. The results indicated that thermal decomposition, amalgamation and atomic absorption spectrophotometry had a lower quantification limit and uncertainty than cold vapour atomic absorption spectrometry (quantification limit, 0.27 vs. 0.63 mg kg(-1); expanded uncertainty, 9.30 % vs. 10.8 %, respectively). Thermal decomposition, amalgamation and atomic absorption spectrophotometry allowed the determination of the base values for the concentration of mercury in soil recommended by international standards, achieving a lower detection limit than cold vapour atomic absorption spectrometry under the study conditions. In addition, thermal decomposition, amalgamation and atomic absorption spectrophotometry represent a more environmentally friendly alternative for mercury determination because this method uses fewer reagents and therefore generates less waste.},
keywords = {compliance, emissions, environmental chemistry, fish, fluorescence impact, in measurement mercury samples, sediments, soil, spectrometry, standards uncertainty, validation},
pubstate = {published},
tppubtype = {article}
}

@article{RN161,
title = {Environmental Assessment of Mercury Pollution in Urban Tailings from Gold Mining},
author = { M.A. Leiva and R.G.E. Morales},
url = {/brokenurl#<Go to ISI>://WOS:000315840000024},
doi = {10.1016/j.ecoenv.2012.12.026},
issn = {0147-6513},
year = {2013},
date = {2013-01-01},
journal = {Ecotoxicology and Environmental Safety},
volume = {90},
pages = {167-173},
publisher = {2013 Elsevier Inc.},
abstract = {It is well-known that small-scale artisanal mining is a source of mercury emissions into the environment, mainly from the use of rudimentary technologies that use mercury amalgamation in the extraction process. Mines near Andacollo, which is located in the Coquimbo region of Chile, use primitive methods to mine gold and copper. In this study, we determined the mercury content of gold mining wastes from Andacollo. At each site, we randomly sampled the soil at the surface and at a depth of 2 m following the ISO 10381 guidelines. Mercury analysis was performed with a direct mercury analyzer. At least one site was contaminated at a mercury concentration of 13.6 +/- 1.4 mg kg(-1), which was above the international recommendations that were set by the Canadian Council of Ministers of the Environment's soil quality guidelines (CA-SQG) and the Dutch guidelines (NL-RIVM). At least four of the fourteen sites in this study were within the control and tolerance levels of these recommendations. Better characterization of these sites is required to establish whether they represent a risk to the local community. Based on the US-EPA recommendations, which have a higher tolerance limit, none of the fourteen sites should pose a risk to humans.},
keywords = {assessment, contamination, environmental chemistry, gold gum health, mercury mining, soil, standard uncertainty},
pubstate = {published},
tppubtype = {article}
}

@article{RN55,
title = {Adsorption of Fungicides in Chilean Soils Incubated with Biosolids},
author = { S. Copaja and H. Bravo and P. Munoz},
url = {/brokenurl#<Go to ISI>://WOS:000305169800006},
doi = {0.4067/S0717-97072012000200006},
issn = {0717-9707},
year = {2012},
date = {2012-01-01},
journal = {Journal of the Chilean Chemical Society},
volume = {57},
number = {2},
pages = {1091-1094},
abstract = {The efficiency of the adsorption process of the fungicides Captan and Thiram was studied in four Chilean soils from the VI [O'Higgins, (HGS)], VII [Talearehue, (THL)] VIII [Diguillin, (DIG)] and Metropolitan [Maipo, (MAO)] regions of Chile. Changes in the efficiency of adsorption when the natural soils were incubated with biosolids were analyzed., The values of parameters Kf and n from the Freundlich equation indicated an increase in the adsorption of fungicides incubated with biosolids (1% and 10%) with respect to natural soil. A high Kf value (12.1) for DIG-Thiram and a lower Kf value (4.3) for MAO-Captan interaction were observed for natural soils, while in soils incubated with biosolids (10%) the greatest value was (20.3) for DIG-Thiram and the lowest Kf value (10.2) for MAO-Captan. In general the high la values for Caplan and Thiram were correlated with organic carbon content in the natural and incubated soils, except for the interaction THL-Thiram, in which inorganic compounds of soils (clay) were dominant., The distribution constant between solid-liquid phases (Kd) increased in soils incubated with biosolids; the magnitude of this constant was more significant with Thiram. The same behavior was observed for the constant related to organic carbon constants (Koc)., The results of this work confirm that amending soils with biosolids is beneficial for immobilizing fungicides and helps prevent the percolation of Caplan and Thiram through the soil profile and into groundwater},
keywords = {biosolids, captan, degradation, desorption, dissolved fungicide, hplc, mobility, organic-matter, pesticides, sludge, soil, sorption, thiram thiram},
pubstate = {published},
tppubtype = {article}
}