SEM show that the samples with NH4OH as a chelating agent are uniform, its particles are about 5 m, and tap-density is 2.
探讨了以氨水作为络合剂时产物的形貌特征，扫描电子显微镜（SEM）显示此方法制备产物颗粒均匀，粒径大约5！m，振实密度为2。
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