Study On The Internal Comparison Analysis Of Vietnamese Rare Earth Ore Sample Toward The Aim Of Making A Certified Reference Material

A concentrate sample of Rare Earth Ore (Dong-Pao, Vietnam) after being fine ground and homogeneously mixed was sent to 7 laboratories for the determination of total rare earth oxide content as well as the content of individual rare earth elements, that consist in the light subgroup (La, Ce, Nd, Pr, Sm) using the various analytical techniques. The analyzed results were then statistically treated by using the local density function. The most concentrated values would be thus proposed to a certified value for that internal reference material. (author)