Table 3. Heavy metal concentrations in the surface sediments of the southwestern coastal Laizhou Bay.
The related values reported for the surface sediments of other marine areas and the average upper continental crust (UCC) values are shown for comparison. Concentration unit is μg g-1 for all elements.
| Location | Sampling date | Sample size | Cd | Cr | Cu | Ni | Pb | Zn | References | |
|---|---|---|---|---|---|---|---|---|---|---|
| Rivers in the SW coastal Laizhou Bay (Bohai Sea), China | May-Jun., 2012 | 35 | Range | 0.21–0.96 | 31.0–179 | 8.3–129 | 11.6–46.6 | 11.8–60.7 | 29.2–357 | This study |
| Mean | 0.41 | 67.2 | 30.2 | 26.4 | 20.3 | 109 | ||||
| Sep.-Oct., 2012 | 33 | Range | 0.14–0.75 | 32.4–192 | 7.3–72.9 | 14.0–62.0 | 11.1–49.2 | 30.2–13214 | ||
| Mean | 0.37 | 68.9 | 23.9 | 27.0 | 17.9 | 548 (113 a ) | ||||
| Coastal waters in the SW Laizhou Bay (Bohai Sea), China | May-Jun., 2012 | 18 | Range | 0.13–0.28 | 36.2–67.8 | 7.6–20.6 | 13.1–27.0 | 11.4–61.5 | 33.5–101 | This study |
| Mean | 0.22 | 50.6 | 11.5 | 18.9 | 17.9 | 48.3 | ||||
| Sep.-Oct., 2012 | 18 | Range | 0.18–0.47 | 39.7–71.7 | 5.1–20.7 | 14.0–28.8 | 9.4–62.6 | 37.3–107 | ||
| Mean | 0.30 | 53.5 | 11.9 | 20.6 | 18.6 | 58.7 | ||||
| Laizhou Bay (Bohai Sea), China | May, 2007 | 31 | 0.081 | 57.1 | 13.3 | 19.4 | 20.2 | 59.4 | [37] | |
| Laizhou Bay (Bohai Sea), China | May, 2008 | 30 | 0.11 | na b | 15.0 | na | 11.7 | 50.8 | [38] | |
| Laizhou Bay (Bohai Sea), China | Oct., 2011 | 18 | 0.22 | 56.7 | 12.0 | 25.9 | 19.4 | 41.5 | [23] | |
| Intertidal Bohai Bay (Bohai Sea), China | May, 2008 | 15 | 0.12 | 68.6 | 24.0 | 28.0 | 25.6 | 73.0 | [39] | |
| Southern Bohai Bay (Bohai Sea), China | Aug., 2008 | 119 | 0.14 | 33.5 | 22.7 | 30.5 | 21.7 | 71.7 | [40] | |
| Coastal Bohai Bay (Bohai Sea), China | May, 2008 | 42 | 0.22 | 101.4 | 38.5 | 40.7 | 34.7 | 131.1 | [10] | |
| Jinzhou Bay (Bohai Sea), China | Oct., 2009 | 25 | 26.8 | na | 74.1 | 43.5 | 124.0 | 689.4 | [41] | |
| Liaodong Bay (Bohai Sea), China | 2009 | 128 | na | 46.4 | 19.4 | 22.5 | 31.8 | 71.7 | [42] | |
| Coastal Shandong Peninsula (Yellow Sea), China | 2007 | 208 | na | 57.8 | 20.0 | 31.2 | 28.4 | 74.7 | [7] | |
| North Yellow Sea, China | Jun., 2006 | 278 | 0.09 | 48.9 | 15.9 | 22.0 | 24.1 | 57.3 | [43] | |
| South Yellow Sea, China | Oct., 2006 | 33 | 0.30 | na b | 16.9 | na | 17.8 | 93.7 | [5] | |
| Changjiang Estuary (East China Sea), China | Apr. and Aug., 2009 | 59 | 0.26 | 78.9 | 30.7 | 31.8 | 27.3 | 94.3 | [44] | |
| NW East China Sea, China | May, 2009 | 35 | 0.30 | 84.2 | 33.1 | 36.1 | 28.0 | 102.4 | [45] | |
| Shantou Bay (South China Sea), China | Dec., 2010 | 15 | 0.67 | 53.6 | 48.5 | 23.0 | 51.6 | 153.3 | [46] | |
| Daya Bay (South China Sea), China | Jan., 2006 | 9 | 0.052 | na | 20.8 | 31.2 | 45.7 | 113 | [16] | |
| Northern South China Sea | Sep., 2005 | 4 | 0.110 | na | 14.1 | 22.6 | 18.0 | 69.9 | [47] | |
| Jade Bay (North Sea), Germany | 2009–2010 | 248 | 0.25 | 49 | 7 | 10 | 16 | 43 | [48] | |
| İzmit Bay (Marmara Sea), Turkey | Apr. 2002 | 34 | 5.10 | 75.0 | 66.4 | 41.2 | 104.7 | 961 | [49] | |
| The Atlantic and Cantabric coasts, Spain | 2001–2007 | 65 | na | na | 115 | na | 91 | 230 | [50] | |
| Gironde Estuary (French Atlantic coast), France | 1998–2007 | 323 | 0.48 | 78.4 | 24.5 | 31.7 | 46.8 | 168 | [51] | |
| UCC | 0.098 | 35 | 25 | 20 | 20 | 71 | [32] |
a mean value excluding the two extremely high values of the sites DH1 and DH2.
b na: not available.