Table 3.

Results from the desorption experiment, in which 180 and 30 μM DMA solutions had interacted with Santomera soil in a SSR of 6 for respectively 1 and 8 h. The data presented include solution concentrations prior to desorption, the desorbed amounts expressed in μmol kg⁻¹, the ratio between the desorbed amount (in μmol kg⁻¹) and the solution concentration prior to desorption (in μM), the equivalent desorbed concentration i.e. the desorbed amount expressed as solution concentration accounting for the SSR, and the predicted adsorbed concentration (in μM) based on the solution concentration prior to adsorption and the adsorption isotherms presented in Table 2

	180 μM DMA					30 μM DMA
	Solution concentration	Desorbed amount	Ratio des. am./sol. conc.	Equivalent desorbed concentration	Predicted equiv. adsorbed conc.	Solution concentration	Desorbed amount	Ratio des. am./sol. conc.	Equivalent desorbed concentration	Predicted equiv. adsorbed conc.
	(μM)	(μmol kg−1)	(l kg−1)	(μM)	(μM)	(μM)	(μmol kg−1)	(l kg−1)	(μM)	(μM)
1 h interaction
FeDMA	20.3 ± 0.4	5.1 ± 0.2	0.25	30.7 ± 1.3	86.5	1.0 ± 0.4	b.d.			4.2
CuDMA	13.4 ± 0.2	6.7 ± 0.1	0.50	39.9 ± 0.8	48.9	5.5 ± 0.6	2.7 ± 0.1	0.49	16.1 ± 0.7	20
NiDMA	0.6 ± 0.2	0.7 ± 0.1	1.17	4.4 ± 0.6	5.1	b.d.	b.d.
CoDMA	b.d.	b.d				b.d.	b.d
ZnDMA	1.6 ± 0.5	1.9 ± 0.1	1.2	11.2	10.9	0.13 ± 0.06	b.d.			0.9
Total	35.8 ± 0.7	14.4 ± 0.3		86.3	151.4	6.6 ± 0.7	2.7 ± 0.1		16.1 ± 0.7	25.2
Total solution + predicted equivalent adsorbed concentration:					187.2 μM					31.8
8 h interaction
FeDMA	9.9 ± 0.6	2 ± 0.2	0.20	12	42.2	0.5 ± 0.1	b.d.			2.1
CuDMA	22.8 ± 0.5	8.8 ± 0.3	0.39	52.8	83.4	6.1 ± 0.5	2.8 ± 0.1	0.46	16.8 ± 0.6	22.3
NiDMA	1.7 ± 0.1	1.5 ± 0.0	0.88	8.9	13.5	b.d.	b.d.
CoDMA	0.6 ± 0.1	0.5 ± 0.1	0.77	2.7		b.d.	b.d.
ZnDMA	1.1 ± 0.0	1.3 ± 0.0	1.23	8.1	7.7	b.d.	b.d.
Total	36 ± 0.8	14.1 ± 0.4		84.4	146.8	6.6 ± 0.5	2.8 ± 0.1		16.8 ± 0.6	24.3
Total solution + predicted equivalent adsorbed concentration:					182.8					30.9