Environmental contamination and chemical speciation of arsenic in the water system from some abandoned Au-Ag mines, Korea

Alkanolamines based carbon dioxide absorption from flue gases remains the most industrially implemented technique. The effective design of absorbers and associated equipment requires robust thermodynamic and kinetic models thus, instigating research efforts in chemical speciation and characterization of CO2loaded alkanolamine solutions. In this study, the potential of Raman spectroscopy has been investigated to determine the in situ chemical speciation in MDEA – CO2– Water system. The Raman spectra have been fitted to thermodynamic values using principal component regression. Results are in good agreement for carbonate, bicarbonate, MDEA and protonated MDEA chemical species.

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Thermodynamic modeling of boric acid and selected metal borate systems

Pure and Applied Chemistry ◽

10.1351/pac-con-12-07-09 ◽

2013 ◽

Vol 85 (11) ◽

pp. 2117-2144 ◽

Cited By ~ 28

Author(s):

Peiming Wang ◽

Jerzy J. Kosinski ◽

Malgorzata M. Lencka ◽

Andrzej Anderko ◽

Ronald D. Springer

Keyword(s):

Boric Acid ◽

Natural Waters ◽

Chemical Speciation ◽

Mixed Solvent ◽

Water System ◽

Solution Chemistry ◽

Chloride Salt ◽

Liquid Equilibrium ◽

Metal Borate ◽

Borate Systems

A comprehensive thermodynamic model, referred to as the mixed-solvent electrolyte (MSE) model, has been applied to calculate phase equilibria, speciation, and other thermodynamic properties of selected systems that are of interest for understanding the chemistry of salt lakes and natural waters. In particular, solubilities and chemical speciation have been analyzed for various boron-containing systems, which represent an important subset of solution chemistry for such applications. The model has been shown to reproduce the speciation, solubility, and vapor–liquid equilibrium (VLE) data in the boric acid + water system over wide ranges of temperature and concentration. Specifically, solubilities have been accurately represented in the full concentration range of the B2O3 + H2O system (xB2O3 = 0~1), which includes H3BO3. The accuracy of the model has also been demonstrated by calculating solubilities in various aqueous borate systems, i.e., MnO + B2O3 + H2O (where M = Li, Na, Ca, Mg), and their mixtures with a chloride salt or an acid (i.e., LiCl, NaCl, HCl). The model predicts the effects of chemical speciation, temperature, and concentrations of various acid, base, and salt components on the formation of competing solid phases.

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Environmental Hazards of Petroleum Refinery in Bangladesh: A Review

Petroleum and Chemical Industry International ◽

10.33140/pcii.04.01.03 ◽

2021 ◽

Vol 4 (1) ◽

Keyword(s):

Environmental Contamination ◽

Petroleum Refinery ◽

Water System ◽

Chemical Separation ◽

Anthropogenic Pollution ◽

Environmental Hazards ◽

Refining Industry ◽

Economic Activities ◽

The Government ◽

Petroleum Refineries

The petroleum refining industry plays a significant role in the national economic activities of Bangladesh. Though, potential environmental hazards related to petroleum and petrochemical factories have caused increased concern for peoples near them. This apprises provides a general impression of the processes involved and some possible environmental contamination associated with petroleum industries. Petroleum refineries separate crude oils into different petroleum materials through a sequence of physical and chemical separation methods. The refining industry provided numerous widely used products as well as gasoline, diesel, kerosene, motor oil, asphalt, waxes, and petroleum gel. But refineries are usually considered a key source of contaminants in areas where they are located and contaminate the air, soil, water system. Pollutant releases from the petroleum refineries occur in every stage of the oil-producing procedure from the extraction to the consumption chain. Now a day, due to vast environmental contamination it is crucially needed to find out of alternative cleaner energy sources rather than liquid petroleum. Bangladesh, a highly populated country and have no sufficient ability to tackle any natural and anthropogenic pollution. So, the environmental impact of petroleum refinery emission in Bangladesh is a serious concern to the government and environmentalists.

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