Industrially Purified Nd Materials Identified by Distinct Mass-Dependent Isotopic Composition

Rare earth elements (REEs) are considered emerging anthropogenic pollutants. Anthropogenic lanthanum, cerium, samarium, and gadolinium alone, or excess of all the REEs have already been reported in environment. In addition, it is only a matter time for neodymium (Nd) origin to be disseminated environment, given its growing demand new technologies use permanent magnets wind turbine. So far, few cases was addition Nd detected soils sediments by measurements REE concentrations. For this reason, we propose isotopic composition help distinction pollution. The tracing using variations abundance 143 from radioactive decay 147 Sm (Nd-radiogenic composition) one option. Here, expand fingerprinting investigation stable expressed as δ x Nd, relative permil (%0) deviation pure JNdi-1 reference standard. measurement used MC-ICPMS (multi-collector inductively coupled plasma mass spectrometry) with sample-standard bracketing technique, allowing determination precise accurate variations. Our results show that Nd-magnets (Neo) man-made purified materials not significantly different on average (respectively, 148 −0.105 ± 0.023 −0.120 0.141%0). More importantly, they terrestrial rocks (δ −0.051 0.031%0). Moreover, Nd-radiogenic Neo can highly variable, even when come single supplier. study compositions demonstrates irrespective their natural (witnessed composition), related mass-dependent fractionation laws. We also defined parameter, Δ 148−150 Nd′, thermodynamic (the Nd′ invariant) kinetic negatively correlated Nd). Such covariation observed could seen small deficit 150 (around 5 ppm/%0/amu), but too consistent nuclear field effect. On other hand, material defines Nd'–δ space full agreement theoretical expectation fractionation. chromatographic separation purification light industrial processes involves and, therefore, likely produce low values associated high Nd′. Both resolvable current technology useful trace incoming pollution soils, combination an unambiguous signal degradation environment products, especially if inconsistent surrounding soils. contrast, residue characterized leak discharge such unambiguously distinguished.