Fractions and leaching characteristics of mercury in coal

Abstract

A huge amount of coal is always stored in open spaces in coal-fired power plants before combustion. Mercury released from coal by rain or flowing water is an environmental risk and can cause contamination of the soil around the storage area. To better understand mercury pollution and to control mercury emission before combustion, it is necessary to determine the mobility and leaching characteristics of mercury from coal. In this study, we collected ten coal samples from one coal-fired power plant and proposed a sequential extraction procedure to get five fractions of mercury for evaluation. Elemental Hg was found as the most dominant fraction, and sulfate Hg was shown to be the second largest fraction. The mercury in the organic and the soluble fractions were not the major fractions, but they should still be considered because of their high mobility.

Effect of ice-temperature storage on some properties of salt-soluble proteins and gel from chicken breast muscles

“…Compared with the control, the surface hydrophobicity value of sample stored at 4°C for 8 days increased by 58.3%, while the value treated at −1.5 o C for the same days increased by only 22.3% (Figure 2). Similar result was reported by X. P. Li et al (2014), Qin et al (2020), and Qiu (2020). The exposure of hydrophobic amino acid residues could be attributed to the increase in surface hydrophobicity of protein (Chamba et al, 2014).…”

“…Similar results were reported by Kong et al (2016) ice temperature was about one times slower than that of refrigerated storage. X. P. Li et al (2014) found that the content of sulfhydryl group of actin decreased most slowly when Chinese shrimp (Fenneropenaeus Chinensis) was stored at −2 o C. The difference in sulfhydryl content in samples stored at different temperatures was due to the oxidation of sulfhydryl group in myofibrillar protein (Kong et al, 2016). The decrease in total sulfhydryl content indicated that myofibrillar proteins of CSSP were continuously oxidized, which might be due to the myosin aggregation caused by low temperature (Ramiarez et al, 2000).…”

Organic compounds in water extracts of coal: links to Balkan endemic nephropathy

“…In addition, distilled, deionized, and/or demineralized water has been commonly used in the laboratory in coal leaching experiments (Praharaj et al 2002; Wang et al 2008; Chakraborty and Mukherjee 2009; Ruhl et al 2010; Yuan et al 2010), including with lignite samples (Tatu et al 1998; Orem et al 1999; McElmurry and Voice 2004; Izquierdo et al 2011), and to study organic compounds (Koopmans et al 1997; Kruger et al 2012) or metals (Prokop et al 2003) from other geologic material. Furthermore, laboratory experiments that simulated groundwater transport have often not mimicked aquifer ion composition (Bales et al 1997; Prommer et al 2008; Jung et al 2009; Wright et al 2010; Zhang et al 2010), particularly when the species of the metals are not known (Christensen and Christensen 1999), as is the case here.…”

Preliminary study of the distribution and risk assessment of mercury in different surficial sediments along the coastal area of the province Thai Binh in Vietnam

“…On the other hand, the contamination in soils close to mercury mine area was predominant as sulphide form [51]. Meanwhile, the predominance of mercury pollution in the soils close to a coal-fired power plant was elemental form [52,53]. Mercury emitted from the coal-fired power plant is generally in the form of vapour mercury (Hg 0 ), which is later absorbed into the sediments in the surrounding via wet and dry depositions.…”