Quantification and speciation of mercury in soils from the Tripuí Ecological Station, Minas Gerais, Brazil.
Contents of total mercury, organic carbon, total sulfur, iron, aluminum and grain size and clay mineralogy were used along with Pearson's correlation and Hg thermal desorption technique to investigate the presence, distribution and binding behavior of Hg in soils from three depths from the Tripuí Ecological Station, located near Ouro Preto, Minas Gerais State, Brazil. The soils studied had predominantly medium and fine sand texture (0.59-0.062 mm), acid character and Hg contents ranging from 0.09 to 1.23 microg/g. The granulometric distribution revealed that Hg is associated with coarse sand (2-0.59 mm) and silt and clay (<0.062 mm) and presents similar Hg concentrations in both fractions. Mercury distribution in soil profiles showed that Hg was homogeneously distributed throughout the depths at most sites. Hg thermal desorption curves show that mercury occurs not only as Hg2+ predominantly bound to organic components in most of the samples, but also in the form of cinnabar in some. Pearson's correlation confirmed that mercury is associated with organic matter and sulfur and possibly with sulfur-bearing organic matter in most samples.
Palmieri
Helena E L
HE
Nuclear Technology Development Centre/National Commission for Nuclear Energy, Caixa Postal 941, Belo Horizonte, Minas Gerais, Brazil. help@cdtn.br
Nalini
Hermínio A
HA
Leonel
Liliam V
LV
Windmöller
Cláudia C
CC
Santos
Regis C
RC
de Brito
Walter
W
D000535:Aluminum / Q000032:analysis; D000538:Aluminum Silicates; D001938:Brazil; D002244:Carbon / Q000032:analysis; D000077215:Clay; D004784:Environmental Monitoring; D006863:Hydrogen-Ion Concentration; D007501:Iron / Q000032:analysis; D008628:Mercury / Q000032:analysis*; D017669:Mercury Compounds; D008906:Mining; D010316:Particle Size; D012822:Silicon Dioxide; D012989:Soil Pollutants / Q000032:analysis*; D013455:Sulfur / Q000032:analysis
D000538:Aluminum Silicates; D017669:Mercury Compounds; D012989:Soil Pollutants; D013455:Sulfur; D002244:Carbon; D012822:Silicon Dioxide; D000535:Aluminum; D007501:Iron; D008628:Mercury; D000077215:Clay; C034211:cinnabar