Ytterbium element Critical Material

Ytterbium depletion from solution during Penidiella sp. T9 cultivation

Experimental Context & Analytical Limits:
T9 was isolated from an abandoned-mine sample in Japan and identified by morphology and ribosomal sequence comparison as Penidiella sp. T9. The NCBI node names this isolate; it does not establish a formally named species or a complete genome. The specificity test supplied separate REE chloride salts at nominal 100 mg/L elemental concentration. Yb was a single-element treatment, separate from the Dy/Nd mixture experiment. The methods refer to the cultivation assay in basal salt medium at pH 2.5, with 20 mM potassium hydrogen phthalate-HCl buffer, at 30 degrees C and 120 rpm. Medium contained 2 g/L glucose, 0.1 g/L yeast extract and 0.05 g/L each of KH2PO4 and K2HPO4, among other salts. Removal was calculated from initial and day-3 dissolved concentrations. The analytical subsection is explicitly titled Measurement of Dy by ICP-AES and describes centrifugation, 0.2-micrometre supernatant filtration and technical triplicate readings; separate Yb calibration, raw replicates and uncertainty are not given. The REE-specific results describe almost no accumulation without T9, but do not publish numerical Yb control concentrations. No Yb biomass loading, intracellular localization, speciation, desorption or isolated-product mass balance is reported. Laboratory synthetic solutions are not mine drainage treatment or industrial deployment.

Curated Evidence Points: