A new approach to using Diffusive Gradient in Thin-films (DGT) labile concentration for Water Framework Directive chemical status assessment: adaptation of Environmental Quality Standard to DGT for cadmium, nickel and lead

Environmental Sciences Europe

Table 2 Application of Eq. (1) for predicting Cd, Ni and Pb DGT labile concentrations from dissolved concentrations

	Mean predicted [M]_DGT (ng L⁻¹)	Lowest predicted [M]_DGT (ng L⁻¹) (LPI 95%)	Validity range (ng L⁻¹)
Cadmium	[Cd]_DGT = 1.01 [Cd]_{Dissolved concentration} – 2	[Cd]_DGT = 0.98 [Cd]_{Dissolved concentration}– 12	[Cd]_{Dissolved concentration} [< LQ; 114]
Nickel	[Ni]_DGT = 0.51 [Ni]_{Dissolved concentration} + 261	[Ni]_DGT = 0.48 [Ni]_{Dissolved concentration}– 166	[Ni]_{Dissolved concentration} [< LQ; 1544]
Lead	[Pb]_DGT = 0.13 [Pb]_{Dissolved concentration} + 65	[Pb]_DGT = 0.11 [Pb] _{Dissolved concentration}– 31	[Pb]_{Dissolved concentration} [< LQ; 1428]