Application of microwave induced combustion in closed vessels for carbon black-containing elastomers decomposition

Microwave-assisted digestion in closed vessels: effect of pressurization with oxygen on digestion process with diluted nitric acid

“…Results obtained with digestion performed with the proposed procedure presented a good agreement with certified values (higher than 96%), even if digestion was performed with a solution of 2 mol L À1 HNO 3 . As observed in previous works [19][20][21] the use of diluted nitric acid and vessels pressurized with oxygen resulted in low blank values. For 500 mg and using 2 mol L À1 HNO 3 and 0.5 MPa O 2 , low blank values were obtained allowing limits of detection of 12, 18, 18, 12, 10, and 12 ng g À1 for Ca, Cu, Fe, Mg, Mn, and Zn, respectively.…”

Spatial variation in natural formation of chloroform in the soils of four coniferous forests

“…Total inorganic halogen (TIX) was calculated as (TX -TOX), which with the accuracy of the analytical procedure gave LOQ for TIX of *2 lg/g. A total of 24 soil samples (triplicate F-and Hhorizons, NF Hot and Low Spot, TX and TOX) were then digested for the determination of total organic halogens using microwave-induced combustion (MIC), which was recently proposed to digest organic samples with complex matrices Moraes et al 2007). The conditions during the MICprocedure were as follows: Triplicate soil samples (about 200 mg) were pressed as pellets using a hydraulic press set at 3 ton for 1 min for further digestion by MIC.…”

Microwave-Induced Combustion

“…For metals retention the most commonly absorbing solution is nitric acid [13,29,30,34,40,44,46,48,51,53] and it was used as diluted as 2-4 mol/l. It is important to mention that depending on the analyte, it could be necessary to use a mixture of acids (HNO 3 + HCl) in order to obtain quantitative recoveries.…”