Four samples of magnetite were obtained using the Massart
method, with slight modifications [20]: a mixture of 500 ml of
ammonium iron(II) sulphate hexahydrate and iron(III) chloride
solutions (Fe(III)/Fe(II) 2:1) were added, in a preset total iron
concentration of A: 0.04, B: 0.4 and C: 0.8 mol l1, over NH3 (1.5 l,
1 mol l1) at 25 or 70 8C under stirring at 200 rpm and addition
flow of 9.5 ml s1 during 20 min. The black suspension was filtered
and washed with distilled water until sulphate and chloride ions
were removed. All the reagents used were of analytical grade.
Samples were labeled as total iron concentration and temperature
reaction, i.e. A25 represents the sample precipitated from an iron
solution of 0.04 mol l1 at 25 8C.
Four samples of magnetite were obtained using the Massartmethod, with slight modifications [20]: a mixture of 500 ml ofammonium iron(II) sulphate hexahydrate and iron(III) chloridesolutions (Fe(III)/Fe(II) 2:1) were added, in a preset total ironconcentration of A: 0.04, B: 0.4 and C: 0.8 mol l1, over NH3 (1.5 l,1 mol l1) at 25 or 70 8C under stirring at 200 rpm and additionflow of 9.5 ml s1 during 20 min. The black suspension was filteredand washed with distilled water until sulphate and chloride ionswere removed. All the reagents used were of analytical grade.Samples were labeled as total iron concentration and temperaturereaction, i.e. A25 represents the sample precipitated from an ironsolution of 0.04 mol l1 at 25 8C.
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