Table 7.
The top 10 categories in which the documents on the industrial effluent and sludge toxicity analysis from 1951 to 2018 were divided into. The results have been achieved by the CiteSpace software. The first two categories with the highest corresponding frequencies have not received a value regarding their burst. These two categories were focused on this field more frequently and not specifically in a short duration of time, which is defined as a burst as the scientometric criterion.
| Rating | Categories | Record Count (No.) | Burst | Centrality | Sigma |
|---|---|---|---|---|---|
| 1 | Environmental Sciences and Ecology | 584 | 1.9 | 0.16 | 1.33 |
| 2 | Environmental Sciences | 577 | 2.11 | 0.09 | 1.2 |
| 3 | Engineering | 296 | 1.31 | 0.4 | 1.55 |
| 4 | Engineering, Environmental | 210 | 1.39 | 0.11 | 1.15 |
| 5 | Toxicology | 202 | 2.49 | 0.06 | 1.15 |
| 6 | Water Resources | 169 | 0.54 | 0.05 | 1.03 |
| 7 | Chemistry | 92 | 1.07 | 0.23 | 1.25 |
| 8 | Engineering, Chemical | 81 | 5.23 | 0.02 | 1.12 |
| 9 | Biotechnology & Applied Microbiology | 76 | 3.96 | 0.06 | 1.24 |
| 10 | Chemistry, Multidisciplinary | 53 | 0.49 | 0.04 | 1.02 |