TY - JOUR
T1 - Determination of rare earth impurities in ultrapure europium oxide by inductively-coupled plasma mass spectrometry
AU - Zhang, Shu Xiu
AU - Murachi, Shinichiro
AU - Imasaka, Totaro
AU - Watanabe, Midori
N1 - Funding Information:
The authors are grateful to Masakazu Yukinari, Shinichirou Kakuta, Tetsushi Sakai and Michiko Matsuda of the Yokogawa Analytical Systems Inc., for their cooperation in IC-ICP-MS. This work is sponsored in part by Fukuoka Science and Technology Foundation, and supportedb y the joint research project among the industrial, academic and govem-mental sectors.
PY - 1995/10/20
Y1 - 1995/10/20
N2 - Trace quantities of rare earth elements (REEs) in ultrapure europium oxide (Eu2O3) are measured by inductively coupled plasma mass spectrometry (ICP-MS). The signal intensity of REE decreases with increasing concentration of europium oxide. Then, the internal standard method is examined to minimize this signal suppression. Four internal standards, cadmium (111Cd+) and indium (115In+), and thallium (205TI+) and bismuth (209Bi+) are investigated, since their mass numbers are close to those of lighter (89Y+-157Gd+) and heavier (159Tb+-175Lu+) REEs, respectively. The use of internal standards o Cd and In suppress interference for lighter REEs, and Tl and Bi for heavier REEs. These results imply the interference concerned with a mass-related space charge effect. In trace analysis of REE impurities in ultrapure Eu2O3, In and Tl are suggested to be used as internal standards for lighter and heavier REEs, respectively, due to the recoveries close to 100%. Lighter REE oxide ions occurring in a plasma generally interfere with the determination of heavier REEs. However, almost all REEs are determined correctly even at ultratrace levels by a proper selection of isotope. Unfortunately, polyatomic ions from the europium oxide such as 153EuO+ and 153Eu18OH+ ions seriously interfere with the determination of 169Tm+ and 172Yb+. These interferences are reduced by using ion chromatography (IC) combined with ICP-MS detection.
AB - Trace quantities of rare earth elements (REEs) in ultrapure europium oxide (Eu2O3) are measured by inductively coupled plasma mass spectrometry (ICP-MS). The signal intensity of REE decreases with increasing concentration of europium oxide. Then, the internal standard method is examined to minimize this signal suppression. Four internal standards, cadmium (111Cd+) and indium (115In+), and thallium (205TI+) and bismuth (209Bi+) are investigated, since their mass numbers are close to those of lighter (89Y+-157Gd+) and heavier (159Tb+-175Lu+) REEs, respectively. The use of internal standards o Cd and In suppress interference for lighter REEs, and Tl and Bi for heavier REEs. These results imply the interference concerned with a mass-related space charge effect. In trace analysis of REE impurities in ultrapure Eu2O3, In and Tl are suggested to be used as internal standards for lighter and heavier REEs, respectively, due to the recoveries close to 100%. Lighter REE oxide ions occurring in a plasma generally interfere with the determination of heavier REEs. However, almost all REEs are determined correctly even at ultratrace levels by a proper selection of isotope. Unfortunately, polyatomic ions from the europium oxide such as 153EuO+ and 153Eu18OH+ ions seriously interfere with the determination of 169Tm+ and 172Yb+. These interferences are reduced by using ion chromatography (IC) combined with ICP-MS detection.
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U2 - 10.1016/0003-2670(95)00273-3
DO - 10.1016/0003-2670(95)00273-3
M3 - Article
AN - SCOPUS:0028834581
SN - 0003-2670
VL - 314
SP - 193
EP - 201
JO - Analytica Chimica Acta
JF - Analytica Chimica Acta
IS - 3
ER -