particle_size_and_contamination
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| particle_size_and_contamination [2024/11/05 00:54] – nefcadmin | particle_size_and_contamination [2025/04/28 10:09] (current) – [19th October 2023 - MLA/2015/00088 - Mid-licence sampling] nefcadmin | ||
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| Much of the contamination within sediment is due to the adsorption of waterborne contamination onto the surface of the particles within the sediment. | Much of the contamination within sediment is due to the adsorption of waterborne contamination onto the surface of the particles within the sediment. | ||
| - | Smaller particles have a higher area per unit weight of material: | + | Smaller particles have a higher area per unit weight of material, so for 1litre of material (10cm x 10cm x 10cm cube with a surface area of 0.06m< |
| * 1 cm diameter spheres: Total surface area ≈ 0.6m< | * 1 cm diameter spheres: Total surface area ≈ 0.6m< | ||
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| The level of contamination is controlled by many factors, local contamination release, flow of the river etc.. So the role of surface area can be difficult to determine in the chemical analyses of different sediments. | The level of contamination is controlled by many factors, local contamination release, flow of the river etc.. So the role of surface area can be difficult to determine in the chemical analyses of different sediments. | ||
| - | The overspill from dredging barges and the resuspension which happens during dredging is mainly composed of the finest particles within the sediment. | + | The overspill from dredging barges and the resuspension which happens during dredging is mainly composed of the finest particles within the sediment. |
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| + | It should also be born in mind that PCBs and other long lived organic contaminants bioaccumulate in seals through their food sources and then passes to the pup during lactation. | ||
| ===== 19th October 2023 - MLA/ | ===== 19th October 2023 - MLA/ | ||
| - | The set of samples taken as part of the mid-licence sampling of the River Tees dredge disposal licence show a strong correlation between relative total surface area and the level of polycyclic aromatic hydrocarbon contamination. | + | The set of samples taken as part of the mid-licence sampling of the River Tees dredge disposal licence show a strong correlation between relative total surface area and the level of polycyclic aromatic hydrocarbon contamination. |
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