外观Appearance                          Colorless Powder
X-射线衍射分析X-Ray Diffraction         Conforms to standard
纯度Purity                              ≥99.9% Based on Trace Metals Impurities of ICP
盐酸溶解试验solubility in 1 M HCl       Clear to Very Slightly Hazy ，50 mg/ml, 1 M HCl
痕量金属分析total metallic impurities   ≤2000ppm by ICP Atomic emission

99.99% metals basis:

外观Appearance                          White Powder
X-射线衍射分析X-Ray Diffraction         Conforms to standard
纯度Purity                              ≥99.99% Based on Trace Metals Impurities of ICP
La                                      84.0 - 86.5 % (Complexiometric EDTA)
ICP:                                    Confirms Lanthanum Component Confirmed 
痕量金属分析total metallic impurities   ≤200ppm by ICP Atomic emission
(Al、B、Ba、Ca、Fe、Gd、Ho、Na、Nd、Pr、Sb、Sc、Sm、Tb、Tm、Yb、Zn)