Freeze-dried samples were digested using a high-performance
microwave digestion system (ETHOS One, Milestone, Sorisole,
Italy) in a temperature ramp of 90 min, and the contents were then
transferred to a 10ml volumetric flask and made up to volume with
water.Analyses were performed by ICP-OES (Varian 720-ES, Varian
Inc., Walnut Creek, CA, USA) with a solution of yttrium as internal
standard.
Freeze-dried samples were digested using a high-performancemicrowave digestion system (ETHOS One, Milestone, Sorisole,Italy) in a temperature ramp of 90 min, and the contents were thentransferred to a 10ml volumetric flask and made up to volume withwater.Analyses were performed by ICP-OES (Varian 720-ES, VarianInc., Walnut Creek, CA, USA) with a solution of yttrium as internalstandard.
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