Microwave Acid Digestion for the Determination of Metals in Subbitumnious Coal Bottom Ash by ICP-OES

Abstract

The development of precise and easy determination method for the metals in fossil fuel is the essential factor for the study of problems which are caused by the existence of metals in fuel. Coal contains many kinds of mineral matter elements including metals derived from its generation. The sample preparation method developed for metal determination in coal by spectroanalytical technique is dry ashing, and wet acid microwave digestion. Microwave-acid digestion (MW-AD) followed by inductively coupled plasma-optical emission spectrometry (ICP-OES) was examined for the determination of metals (Cd, Co, Cr, Cu, Fe, Mn, Mo, Ni, Pb, Zn) in coal bottom ash (CBA). Subbitumnious coal from Hazro deposits in SE Anatolia of Turkey has been used in this study. Metals in coal gave good recoveries for their certified or reference values.

Determination of Boron, Lithium and Some Metals in Fly Ash by Laser Ablation ‒ Inductively Coupled Plasma ‒ Optical Emission Spectr ometry

“…Some of them are Li I 670.784 nm (Fig. 1c), Ni II 231.604 nm [24,25,26], Cr II 283.563 nm [23][24][25], V II 290.882 nm [24,26,27].…”

Phytoremediation Potential of Vetiver Grass (Vetiveria Zizanioides) in Two Mixed Heavy Metal Contaminated Soils from the Zoundweogo and Boulkiemde Regions of Burkina Faso (West Africa)

“…Shoots and roots tissue, previously air-dried for 72 h, were oven-dried at 60˚C for 48 h. The dry biomass was weighed, ground to a fine powder (Retsch ZM 1) and sieved through a 2-mm mesh. For metal extraction, the microwave digestion method used and 200 mg of plant material was digested using an acid mixture of 69% HNO 3 and 30% H 2 O 2 (2:1 v/v) into a pressure-resistant PTFE (polytetrafluoroethylene) vessel (Saydut, 2010;Güven & Akinci, 2011). Metal-concentrations (Cd, Cu, Mn, Pb, Zn, Ni, Cr) in plant tissue were analyzed by Inductively Coupled Plasma -Atomic Emission Spectroscopy (ICP-AES, Varian 702-ES model) as above with a limit of quantification of 0.63 mg/kg dry weight.…”

Phosphorus Speciation in Coal Bottom Ash

“…The reference material was dried in an oven at 105°C for 3 hours and stored until analysis over silicagel in a desiccator. For analysis, 10.0 g samples were put into a porcelain crucible and subjected to a calcination step in a muffle furnace at 650°C for about 8 hours (13).…”

“…Approximately 2 g of coal bottom ash sample was dissolved in a 10-mL mixture of perchloric (70%) and sulfuric acid (98%) (1:1). Following filtration, total phosphorus was determined using ICP-OES (13,14,16,17).…”

“…These elements enter the environment mostly from nat-ural sources such as water, air, dust, soil, food, mining tailings, earth crust, volcanic eruptions, sewage sludge, sediments, animal manure, marshes, landfills, and also from the burning of fossil fuels. Indeed, it has been reported that uncontrolled disposal of coal ashes may cause a dispersion of fine particles (into the air, soils, food, water) and become hazardous to health (11)(12)(13).…”