Development of 9 Kinds of Plant Matrix Reference Materials for Elemental Analysis and Quantitative Characteristics by QI Chao, MIN Popo, LIU Chunyang, SHEN Lei, HE Kun, ZHANG Yajun, CAI Guoliang, LI Gen, JI Jie, ZHU Minmin, LI Cheng, LIU Yaxuan

“…This is a guideline for the selection of suitable quality control samples.Due to the progress of the current testing methods and instruments, the precision of the data for the determination of rare earths and other elements with very low contents in some samples was good, and standard values were given, such as Eu (9.4±1.7ng/g), Ge (7.8±2.3ng/g), Lu (1.7±0.5ng/g), Tb (5.3±0.9ng/g), Tm (1.8±0.6ng/g) in rape, while the previous reference materials of similar vegetable matrixes did not reach such definite levels. …”
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Numerical studies in soil distribution by Cuanalo de la Cerda, H

“…The dendrograms showed that two main groups of the Brown Earths remained stable in spite of changes in standardization. …”

Zheltozems of Russia: Micromorphology, clay minerals, and pedogenetic analysis Zheltozems de Rusia: micromorfología, minerales de la arcilla y análisis edafogenético Zheltozems da... by Maria Gerasimova, Natalia Chizhikova, Ilya Gurov

“…Zheltozems (literally "yellow earths") that can be classified as Acrisols, Alisols, or Ultisols, occupy very small areas in Russia; they are strongly modified by human activities. …”
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Correct Symmetry Treatment for X + X Reactions Prevents Large Errors in Predicted Isotope Enrichment by Goldman, Mark Jacob, Ono, Shuhei, Green Jr, William H

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