Spectroscopic and Microscopic Characterization of Volcanic Ash from Puyehue-(Chile) Eruption: Preliminary Approach for the Application in the Arsenic Removal

Table 1

EDS data for volcanic pyroclastic mixture (PM) and selected typical components.

% oxide	PM	ST	STW	RB	PT	PTW
CO2	4.12	7.30	6.15	12.56	3.64	2.44
Na2O	4.65	4.05	3.44	Nd	5.58	5.37
MgO	2.08	2.82	3.02	10.07	1.41	0.57
Al2O3	14.85	17.01	17.89	4.72	13.84	14.52
SiO2	61.25	54.56	51.60	37.48	62.76	68.28
K2O	1.48	1.21	0.60	Nd	3.19	2.36
CaO	2.75	4.90	5.61	3.70	2.52	1.85
TiO2	1.01	0.88	1.57	4.47	1.07	1.06
Fe2O3	7.81	7.27	10.12	27.00	5.99	3.55

PM: volcanic pyroclastic mixture; ST: scoria type; PT: pumiceous type; RB: rounded block; w: washed.