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Table 3 The effective porosity of rock samples after and before treatment with water and acidic solution

From: Acid solution decreases the compressional wave velocity of sandstone from the Yungang Grottoes, Datong, China

  Natural state Water H2SO4 (mol L−1) HNO3 (mol L−1)
0.2 0.4 0.8 0.2 0.4 0.8
Effective porosity (%) 6.03 6.09 8.21 10.32 11.09 8.06 9.37 9.48