Environmental Aspects of Trace Elements in Coal

Swaine, Dalway J.; Goodarzi, F.

doi:10.1007/978-94-015-8496-8

Cited by 148 publications

(2 citation statements)

References 190 publications

(302 reference statements)

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“…The mode of occurrence of Mn is in the form of carbonates, siderite and ankerite. 15 It is an essential trace element known to be related particularly to the reproductive functions. Deficiency may lead to brain damage, teratogenicity, skeletal abnormalities, and abnormal metabolism of lipids and carbohydrates.…”

Section: Introductionmentioning

confidence: 99%

Comparison of Three Sequential Extraction Methods for the Determination of Iron, Manganese, and Thallium in Asphaltite Samples

Bilgin¹,

Fidan²,

Aydın³

et al. 2020

At.Spectrosc.

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Asphaltite, which is based on petroleum, contains many elements that exist in different forms. In this study, the BCR sequential extraction (BCRSE), Tessier sequential extraction (TSE) and Stover sequential extraction (SSE) procedures were applied for the determination of Fe, Mn and Tl in different forms (exchangeable, carbonates, bound to organic and sulfide, and residual content) in the structure of asphaltite. The statistical relations between the metal values of the three different methods were determined and recommendations are given for the enrichment of these economically valuable elements from asphaltite samples. The most abundant form of Fe (%), Mn (mg kg-1) and Tl (mg kg-1) follows the order: reducible (2.28), residual (75.85) and residual (81.99) with BCRSE method; carbonates (2.46), residual (79.21) and residual (79.75) with TSE method; carbonates (2.36), residual (67.34) and residual (46.93) with SSE method. The Fe, Mn and Tl speciation scheme gives quantitative knowledge of toxicity, bioavailability, mobility, leachability and bioaccumulation, etc., for asphaltite. A comparison of the three methods shows that the TSE method is shorter and more economical, while SSE gives more detailed information about the chemical structure of the substances, and the BCRSE has reducible (as oxides) fractions for the metals. This is the first time that a comparison of the three extraction methods was carried out on asphaltites and reported. The certified reference material (CRM) NIST-1633b Coal Fly Ash was used to verify the accuracy of the method, and whether the results are in good agreement with the certified values.

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Section: Introductionmentioning

confidence: 99%

Comparison of Three Sequential Extraction Methods for the Determination of Iron, Manganese, and Thallium in Asphaltite Samples

Bilgin¹,

Fidan²,

Aydın³

et al. 2020

At.Spectrosc.

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“…Coal-fired power plants are an important source of As and Pb pollutants in the atmosphere . The high concentrations of As and Pb in local areas have strong carcinogenic, teratogenic, and mutagenic effects on the human body and will lead to heavy metals poisoning in other organisms in the ecological environment, thereby seriously affecting the ecological balance . Regarding to the emission of As and Pb from coal-fired power plants, some countries and regions have corresponding limits.…”

Section: Introductionmentioning

confidence: 99%

Transformation Characteristics of Arsenic and Lead during Coal Combustion

Song

et al. 2019

Energy Fuels

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The study of the transformation of heavy metals during the coal combustion process is of great significance to controlling their emission. In this study, three coals with different contents of arsenic (As), lead (Pb), and mineral elements were selected. The experiments were conducted at 900−1300 °C using a drop tube furnace system. The transformation of As and Pb during the combustion processes of the three coals was obtained. It was found that both the gaseous and particulate phases were important forms of As and Pb in the combustion products. As the temperature increased, the proportion of gaseous-phase As of the YBS (Yuan Baoshan) coal and JT (Jing Tai) coal first increased and then decreased, and the proportion of gaseous-phase As of the HLH (Huo Linhe) coal increased slightly. As the temperature increased, the proportion of gaseousphase Pb of the three coals increased and reached approximately 65% at 1300 °C. For the particulate phase, As and Pb were mainly present in ultramicrometer particles after combustion. The differences in the three coal components caused the different distributions of As and Pb in the gaseous and solid combustion products. The coal with a high content of iron (Fe) and calcium (Ca) was more conducive to the migration of gaseous-phase As to solid-phase As during flue gas cooling, while the effects of Ca and sulfur (S) on Pb transformation in the coal were offset. The original modes of occurrence of As and Pb in the three coals were mainly organic-bound and residual forms. During the combustion process, the organic-bound As and Pb were completely released, the residual As and Pb were partially released, and small amounts of water-soluble and ion-exchangeable As and Pb were formed. The analysis of the distribution characteristics of As and Pb in the combustion products showed that the direct release ratios of As and Pb during high-temperature combustion were greater than 45%. During flue gas cooling, more than 60% of As and Pb in the submicrometer particle were produced by transformation from the gaseous phase to particulate phase.

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Origin, Mobilization and Distribution of Selenium in a Soil/Water/Air System: A Global Perspective With Special Reference to the Indian Scenario

Paikaray

2016

CLEAN Soil Air Water

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Narrow tolerance limit of selenium (Se) brings serious concerns through deficiency as well as toxicity in the biological and environmental systems. Both geogenic and anthropogenic activities govern Se origin in nature, while its bioavailability is controlled by biogeochemical conditions and nature of Se species. Selenium hazards have drawn a special research interest globally, especially in USA, Canada and China, where large populations of aquatic life and human beings are being severely affected. Both Se deficiency and toxicity has been reported in India. Deficiency is shown to amplify arsenic (As) poisoning in As polluted regions. Industrial, mining, coal burns, and natural sources have been recognized as major causes of Se poisoning in soil, surface/groundwater and atmosphere. Besides local scale pollutions, the NW Indian state Punjab is known as the most alarmed region with >1000 ha of contaminated farm lands. Alkaline soil pH, cultivation of Se bioaccumulators, improper treatment of industrial effluents/emissions is responsible for Se mobilization and easy bioavailability. Acidification of soil pH, phytoremediation, application of excessive organic matters and sulfur‐rich minerals such as gypsum, changes in cultivation practices to non‐bioaccumulators, regulatory industrial effluent/emission treatment, and avoidance of Se‐rich fodders are considered to overcome Se‐toxicity, while Se supplements and/or Se‐rich fertilizers may resolve Se‐deficiency.

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Environmental Aspects of Trace Elements in Coal

Cited by 148 publications

References 190 publications

Comparison of Three Sequential Extraction Methods for the Determination of Iron, Manganese, and Thallium in Asphaltite Samples

Comparison of Three Sequential Extraction Methods for the Determination of Iron, Manganese, and Thallium in Asphaltite Samples

Transformation Characteristics of Arsenic and Lead during Coal Combustion

Origin, Mobilization and Distribution of Selenium in a Soil/Water/Air System: A Global Perspective With Special Reference to the Indian Scenario

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