Table 1: Parameters of 15 REEs and lead detection methods (ug/g).
Elements | SD | Linear correlation coefficient | Detection limit | Elements | SD | Linear correlation coefficient | Detection limit |
La | 0.0040 | 0.9995 | 0.0119 | Dy | 0.0010 | 0.9996 | 0.0030 |
Ce | 0.0107 | 0.9994 | 0.0320 | Ho | 0.0006 | 0.9993 | 0.0018 |
Pr | 0.0013 | 0.9993 | 0.0039 | Er | 0.0004 | 0.9994 | 0.0011 |
Nd | 0.0044 | 0.9998 | 0.0133 | Tm | 0.0004 | 0.9992 | 0.0012 |
Sm | 0.0013 | 0.9996 | 0.0039 | Yb | 0.0008 | 0.9993 | 0.0025 |
Eu | 0.0007 | 0.9996 | 0.0022 | Lu | 0.0006 | 0.9990 | 0.0017 |
Gd | 0.0010 | 0.9996 | 0.0031 | Y | 0.0083 | 0.9993 | 0.0250 |
Tb | 0.0000 | 0.9993 | 0.0000 | Pb | 0.6696 | 0.9994 | 2.0088 |