Physicochemical study of extractants for extraction of rare earth element

Journal of Analytical Science and Technology

Table 3 Ultrasonic velocity (C),excess acoustic impedance (Z^E), excess isentropic compressibility (Δβ_s) of pure tributyl phosphate (TBP), toluene, and binary mixture of TBP and toluene at different mole fraction with different frequencies (1–4 MHz) for temperature 303.15 K

Mole fraction of TBP	C (m/s)				Z^E (Kgm⁻²s)				Δβ_s(N⁻¹m⁻²)
X1	1 MHz	2 MHz	3 MHz	4 MHz	1 MHz	2 MHz	3 MHz	4 MHz	1 MHz	2 MHz	3 MHz	4 MHz
0.0000	1277	1276	1275	1274	0	0	0	0	0	0	0	0
0.0712	1273	1272	1269	1266	8822.209136	9017.370483	7338.805523	5727.921717	−24.0977223	−23.5064086	−29.1325544	−34.5556821
0.1692	1270	1267	1264	1263	18,398.69858	17,094.45081	15,468.52745	15,775.09589	−40.2538249	−44.5948991	−49.8040229	−48.8577351
0.2570	1266	1263	1262	1260	22,275.00696	21,192.98695	21,418.41985	20,990.12630	−51.6533634	−55.1956038	−54.4491710	−55.8436206
0.4356	1263	1260	1257	1254	26,126.04457	25,516.19964	24,078.21116	23,054.29446	−45.1060738	−47.1285120	−51.4146950	−54.5538893
0.5052	1260	1257	1254	1252	24,444.13866	24,021.78251	22,638.96235	22,658.39719	−44.9226509	−46.3532079	−50.4121021	−50.4289483
0.5820	1257	1254	1251	1248	22,042.54496	21,828.96515	20,508.91255	19,742.09635	−42.4159704	−43.2020031	−47.0186650	−49.3089136
0.7059	1254	1250	1247	1244	18,040.51155	17,232.04710	16,017.50963	15,473.98517	−30.3684272	−32.8126061	−36.2578405	−37.8555057
0.7781	1252	1248	1245	1242	14,720.53797	14,108.45672	12,957.15199	12,545.49200	−22.7984274	−24.6398124	−27.8763920	−29.0782435
0.8712	1247	1244	1241	1238	7666.794,136	8254.419,283	7185.757,323	6945.238,917	−18.6133,625	−17.0301590	−19.9923,546	−20.6784,768
1.0000	1244	1240	1238	1235	0	0	0	0	0	0	0	0