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Table 4 The daily P-wave velocity change rates (%) in three stages for the rock samples immersed in water and acidic solutions

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

Treatment days Water group H2SO4 groups (mol L−1) HNO3 groups (mol L−1)
0.2 0.4 0.8 0.2 0.4 0.8
I (days 1–4) − 2.04 ± 0.89 − 4.20 ± 1.77 − 4.83 ± 1.82 − 5.16 ± 2.04 − 2.42 ± 0.89 − 3.24 ± 1.09 − 4.02 ± 1.94
II (days 5–8) 1.30 ± 0.76 − 1.17 ± 0.84 − 1.01 ± 0.79 − 1.06 ± 0.65 − 1.43 ± 0.87 − 1.73 ± 0.54 − 1.55 ± 0.81
III (days 9–19) 0.15 ± 0.08 − 0.32 ± 0.15 − 0.16 ± 0.09 − 0.15 ± 0.08 − 0.34 ± 0.13 − 0.20 ± 0.07 − 0.06 ± 0.04