Multivariate factorial analysis to design a robust batch leaching test to assess the volcanic ash geochemical hazard

作者：Ruggieri Flavia; Gil Raul A; Fernandez Turiel Jose Luis^*; Saavedra Julio; Gimeno Domingo; Lobo Agustin; Martinez Luis D; Rodriguez Gonzalez Alejandro

来源：Journal of Hazardous Materials, 2012, 213: 273-284.

DOI：10.1016/j.jhazmat.2012.01.091

• Volcanic ash
• Batch leaching
• Mixed factorial design

A method to obtain robust information on short term leaching behaviour of volcanic ashes has been developed independently on the sample age. A mixed factorial design (MFD) was employed as a multivariate strategy for the evaluation of the effects of selected control factors and their interactions (amount of sample (A), contact time (B), and liquid to solid ratio or L/S (C)) on the leaching process of selected metals (Na, K. Mg, Ca, Si, Al, V. Mn, Fe, and Co) and anions (Cl- and SO42-). Box plots of the data acquired were used to evaluate the reproducibility achieved at different experimental conditions. Both the amount of sample (A) and leaching time (B) had a significant effect on the element stripping whereas the L/S ratio influenced only few elements. The lowest dispersion values have been observed when 1.0 g was leached with an L/S ratio equal to 10, shaking during 4 h. The entire method is completed within few hours, and it is simple, feasible and reliable in laboratory conditions.

• 出版日期2012-4-30