An integrated approach based on oxidative pyrolysis and microwave-assisted digestion for the multi-elemental analysis of coal samples by ICP-based techniques

Krishna, M. Bala; Chandrasekaran, K.; Chakravarthy, Satyanarayanan R.; Karunasagar, D.

doi:10.1016/j.fuel.2015.06.039

Cited by 9 publications

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References 50 publications

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“…1 Additionally, detection and quantification limits allow the determination of a diversity of metals and nonmetals in a myriad of sample types such as cements, ceramics, silicates, geological materials, metallosilicates, refractory compounds, aluminophosphates, silicoaluminophosphates, clays, phyllosilicates, and coals. 4,[6][7][8][9][10][11][12][13][14] The chemical analysis of the inorganic solids mentioned above by ICP OES using conventional acid dissolution methods, in open flasks on hot plate, 15 usually involves costly and time-consuming procedures for sample preparation, 3 requiring a long analysis time and large amounts of reagents. Additionally, such conventional procedures do not assure complete dissolution of some solid inorganic samples, especially geological samples 15,16 (including silicates 8,13,17 and aluminosilicates) 14,16 even when a large amount of concentrated acids is used.…”

Section: Introductionmentioning

confidence: 99%

A Straightforward Method for Determination of Al and Na in Aluminosilicates Using ICP OES

Ramos¹,

Almeida²,

Júnior³

et al. 2017

J. Braz. Chem. Soc.

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The improvements on aluminosilicates dissolution through microwave-assisted acid decomposition procedures for Na and Al quantification by inductively coupled plasma optical emission spectrometry (ICP OES) are reported here. Complete dissolution of the samples is achieved employing 4 mL of HNO 3 and 3-4 mL of HF thus reducing the total amount of these reactants in comparison with procedures found in the literature. Additionally, the type of crucibles used in the calcination for sample preparation step is also evaluated. Na and Al concentrations are in agreement with the expected values on the samples. Estimated silicon amount is achieved by difference of sodium and aluminum, and then Si/Al molar ratios were calculated for samples calcined in both porcelain (Si/Al is in the range 22-42) and platinum (Si/Al is in the range 27-40) crucibles, showing no difference between these procedures.

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