Table 1.
Observed d/l values for aspartic acid adsorbed on calcite crystal faces for three successive acid-wash experiments
| Crystal no. | Indices | Face type | d/l (1) | d/l (2) | d/l (3) |
|---|---|---|---|---|---|
| 1 | (2 1 3̄ 1) | R | 1.0020(25) | 1.0123(12) | 1.0365(19) |
| (3 1̄2̄ 1) | L | 0.9922(2) | 0.9978(15) | 0.9857(12) | |
| (1 3̄ 2 1) | R | 1.0053(20) | — | 1.0029(34) | |
| (1̄2̄ 3 1) | L | 0.9398(16) | — | 0.9991(34) | |
| (3̄ 2 1 1) | R | 0.9904(28) | 1.0062(45) | — | |
| (2̄ 3 1̄ 1) | L | 0.9894(10) | 0.9918(37) | 0.8960(49) | |
| 2 | (2 1 3̄ 1) | R | 1.0004(51) | 1.0042(51) | — |
| (3 1̄2̄ 1) | L | 0.9850(51) | 0.9908(51) | 0.9594(36) | |
| (1 3̄ 2 1) | R | 0.9957(51) | 0.9974(51) | 1.0113(27) | |
| (1̄2̄ 3 1) | L | 1.0036(51) | 0.9800(23) | 0.9930(51) | |
| (3̄ 2 1 1) | R | 0.9984(2) | 1.0001(51) | 0.9996(51) | |
| (2̄ 3 1̄ 1) | L | 0.9925(51) | 0.9695(23) | 0.9811(24) | |
| (0 1 1̄1̄) | C | 0.9889(51) | 1.0025(51) | 0.9972(25) | |
| 3 | (2 1 3̄ 1) | R | 1.0011(51) | 0.9986(51) | 0.9852(8) |
| (3 1̄2̄ 1) | L | — | 0.9979(51) | 0.9288(51) | |
| (1̄2̄ 3 1) | L | 0.9942(51) | 1.0028(51) | 0.9470(12) | |
| (2̄ 3 1̄ 1) | L | 1.0028(51) | 0.9993(51) | 0.9938(51) | |
| (0 1 1̄1̄) | C | 1.0024(51) | 0.9928(51) | 1.0002(51) | |
| (1 1̄ 0 1̄) | C | 0.9917(51) | 0.9988(51) | 0.9936(51) | |
| 4 | (2 1 3̄ 1) | R | 0.9955(51) | 0.9935(51) | 0.9860(29) |
| (1̄2̄ 3 1) | L | 1.0038(51) | — | 0.9952(51) | |
| (2̄ 3 1̄ 1) | L | 1.0026(51) | 1.0013(6) | 0.9675(31) | |
| (1 1̄ 0 1̄) | C | 0.9975(51) | 0.9972(51) | 0.9937(12) |
The analytical error of d/l-aspartic acid values, based on 3–6 (mean of 3.6) replicate injections of 15 samples, averaged 0.0051 or 0.52% of the d/l value. For samples analyzed only once, this value is taken as the error of the measurement. For samples analyzed two or more times, the standard error of the measurements is used as the measure of analytical error.