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Volume 10, No. 1, February 2010, Pages 59-66 PDF(405 KB)  
doi: 10.4209/aaqr.2009.06.0039   

Microanalysis of Dust Deposition inside Emperor Qin's Terra-Cotta Warriors and Horses Museum

Tafeng Hu1,2,3, Junji Cao1,2, Shuncheng Lee3, Xuxiang Li1, Zhenxing Shen1, Bo Rong4, Zhisheng An2

1 Department of Environmental Science and Engineering, Xi’an Jiaotong University, Xi’an, China
2 SKLLQG, Institute of Earth Environment, Chinese Academy of Sciences, Xi’an, China
3 Department of Civil and Structural Engineering, The Hong Kong Polytechnic University, Hong Kong, China
4 Emperor Qin’s Terra-cotta Warriors and Horses Museum, Xi’an, China




Indoor dust deposition, including long-term (>10 years) deposition, short-term (~0.5 year) deposition, and pigment flake samples from partially restored warriors were collected in Emperor Qin's Terra-cotta Warriors and Horses Museum in Xi'an, Shaanxi Province, China. Morphological and elemental analyses of individual particles were performed with scanning electron microscopy and energy dispersive X-ray spectrometry to investigate their composition and potential to damage the statues. Most of the indoor dust was composed of clay minerals, fly ash, and biogenic particles. Particles in 51.5% of the short-term deposition, and 49.5% of the long-term deposition contained elemental sulfur. Particles which contained sulfur were mostly associated with calcium sulfate in an internally mixed state with clay or quartz. Crystals of calcium sulfate were also found near interconnected pits and cracks on the outer surface of pigment flakes, revealing an acidic chemical reaction between sulfur dioxide and pigment material or deposited particles as the cause of pits and cracks on the statues’ faces.



Keywords: Dust deposition; Terra-cotta warriors; Museum; Scanning electron microscopy.



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