Objective: To analyze and identify Alumen

calcined Alumen and their counterfeits by using X-Ray diffraction (XRD)

Near Infrared (NIR) and Raman spectroscopy technique. Method: Nine batches of Alumen and 5 batches of calcined Alumen were purchased from the market

and another 2 batches of calcined Alumen were prepared by ourselves. Their XRD

NIR and Raman spectra were collected

and their spectral characteristics and differences were analyzed. Result: There were significant differences between Alumen and its counterfeit Ammonium alum in XRD

NIR and Raman spectra. In XRD patterns

Ammonium alum had a peak at 14.56°

while Alumen had no such peak. In NIR spectra

Ammonium alum had a characteristic peak at 4 650 cm-1

while Alumen had no such peak. In Raman spectra

the strongest peak of Alumen at 990 cm-1 was split to produce a moderate intensity peak at 974 cm-1

while Ammonium alum had no such peak at 974 cm-1. The above differences could be used for the rapid identification of Alumen and its counterfeit Ammonium alum. Besides

calcined Alumen had 9 characteristic peaks (2θ=11.18°

21.88°

24.58°

31.42°

33.76°

38.25°

39.94°

50.24ånd 50.99°) in XRD patterns and 2 absorption peaks (7 000 cm-1 and 5 150 cm-1) in NIR spectra

which could be used as the characteristic peaksto identify the calcined Alumen and its counterfeit. Conclusion: XRD

NIR and Raman spectral characteristicscould be used for the rapid identification of Alumen

calcined Alumen and their counterfeits. NIR combined with Raman spectra could provide a rapid and accurate method for the quality control and rapid identification of Alumen and its processed products.