微红黄色晶体。

                                                                                                          (AR)              
S4· 4H2O)Assay,%                                                                        ≥ 98.0          
氯化物(Cl)Chloride,%                                                                     ≤ 0.01       
铝(以Al2O3计)Aluminum,%                                                            ≤ 0.08         
氨水不沉淀物Substances not precipitated by ammonia,%        ≤ 0.20         
重金属(以Pb计)Heavy metals,%                                                    ≤ 0.005       
铁(Fe)Iron,%                                                                                     ≤ 0.005        
三价铈盐(CeO2)Cerous,%                                                             ≤ 0.2       
其他稀土金属Other rare metals,%                                                 ≤ 0.2          
硫酸不溶物Insolubhe in sulfuric acid,%                                         ≤ 0.05      

	分析纯试剂。
密封保存！