Liaoning | Institute of Metal Research, Chinese Academy of Sciences | 1992 | Exposed Samples | 192 | 148600 | --- | Isolines | --- | [44, 45] |
Shenyang | Institute of Metal Research, Chinese Academy of Sciences | 1992 | Exposed Samples | 36 | 164 | --- | Isolines | --- | [46] |
Hainan | Institute of Metal Research, Chinese Academy of Sciences | 1998 | Exposed Samples | 20 | 35400 | --- | Isolines | --- | [47] |
Chongqing | Chongqing University | 2005 | DRF | --- | 82402 | --- | Grid | --- | [48] |
China | University of Science and Technology Beijing | 2014 | Exposed Samples and DRF | 49 | 9600000 | --- | Color blocks | Inverse Distance Weighting | [49, 50] |
Fujian | Shanghai University of Electric Power | 2017 | Exposed Samples | 16 | 124000 | --- | Color blocks | Inverse Distance Weighting | [54] |
Guangdong | South China University of Technology | 2018 | Exposed Samples and DRF | 150 | 179700 | --- | Color blocks | Kriging | [55] |