Optimization of Milling Procedures for Synthesizing Nano-CaCO₃ from Achatina fulica Shell through Mechanochemical Techniques

Table 2

Statistical data of the particle size of CaCO₃ wet milled with ethylene glycol, ethanol, water, and methanol.

Base count	E (nm)	ED (nm)	M (nm)	W (nm)
Count	28	28	28	28
Minimum	13.48	11.56	12.57	24.29
Maximum	42.90	65.78	98.66	180.06
Standard deviation	8.17	14.17	27.17	35.74
Variance	66.82	200.80	738.35	1277.52
Median	25.65	31.53	46.07	54.97
Mean	25.39	32.63	51.97	63.68