Journal of Chemistry

Research Article

Migration and Transformation of Heavy Metals in the Soil of the Water-Level Fluctuation Zone in the Three Gorges Reservoir under Simulated Nitrogen Deposition

Table 4

Fitting parameters of each kinetic model for HMs in the WFLZ soil in the TGR area under N deposition.


HMs	N load	Elovich equation S = alnt + b			Double-constant equation lnS = alnt + b			First-order equation Ln(S/S_m) = at + b			Parabolic diffusion equation S/S_m = at^1/2 + b
HMs	N load	A	B	R ²	a	b	R ²	a	b	R ²	a	b	R ²

Cr	N₀	22.71	−15.98	0.912	0.7375	1.6570	0.998	0.0495	−0.2814	0.805	0.7342	−0.7290	0.996
	N₂₀	24.03	−19.40	0.896	0.7999	1.4668	0.998	0.0537	−0.3862	0.806	0.7824	−0.9239	0.992
	N₄₀	24.98	−18.65	0.915	0.7807	1.5989	0.995	0.0517	−0.2670	0.783	0.8069	−0.8541	0.997
	N₆₀	27.22	−18.29	0.926	0.7433	1.8387	0.993	0.0490	−0.0745	0.774	0.8746	−0.8052	0.999

Cu	N₀	21.41	−15.98	0.888	0.7342	1.5831	0.997	0.0503	−3.5867	0.837	0.0283	−0.0308	0.987
	N₂₀	21.91	−12.55	0.937	0.6957	1.8161	0.990	0.0457	−3.3657	0.765	0.0283	−0.0208	0.997
	N₄₀	22.03	−13.22	0.920	0.6825	1.8470	0.997	0.0458	−3.3738	0.805	0.0288	−0.0234	0.997
	N₆₀	24.51	−14.23	0.919	0.6826	1.9633	0.992	0.0455	−3.2502	0.788	0.0320	−0.0249	0.995

Cd	N₀	1.1235	−0.7942	0.920	0.7580	−1.4149	0.988	0.0504	−6.0825	0.781	0.0023	−0.0022	0.989
	N₂₀	1.2880	−1.1353	0.909	0.9208	−1.8707	0.985	0.0599	−6.2842	0.745	0.0026	−0.0033	0.993
	N₄₀	1.1909	−0.7221	0.954	0.7594	−1.3068	0.973	0.0485	−5.9317	0.710	0.0024	−0.0017	0.988
	N₆₀	1.3679	−1.0362	0.932	0.8253	−1.4479	0.986	0.0536	−5.9971	0.745	0.0028	−0.0028	0.995

Ni	N₀	5.191	−2.730	0.961	0.7325	0.2866	0.965	0.0461	−3.7091	0.685	0.0196	−0.0113	0.977
	N₂₀	5.257	−2.398	0.950	0.6747	0.5061	0.969	0.0432	−3.5899	0.713	0.0199	−0.0095	0.975
	N₄₀	5.476	−2.533	0.945	0.6677	0.5663	0.976	0.0430	−3.5448	0.727	0.0209	−0.0107	0.983
	N₆₀	5.289	−2.055	0.966	0.6673	0.5661	0.961	0.0419	−3.5221	0.678	0.0199	−0.0064	0.971

Pb	N₀	5.730	−8.348	0.698	1.4801	−2.6781	0.915	0.1096	−5.4861	0.898	0.0367	−0.0859	0.873
	N₂₀	11.39	−16.09	0.717	1.3214	−1.4157	0.924	0.0986	−4.4358	0.921	0.0730	−0.1654	0.893
	N₄₀	18.21	−22.30	0.817	1.1846	−0.3050	0.955	0.0828	−3.3801	0.837	0.1128	−0.2150	0.952
	N₆₀	23.20	−34.11	0.729	2.1463	−3.3404	0.975	0.1416	−4.9676	0.760	0.1482	−0.3483	0.904

Note. Correlation coefficients (R²) higher than 0.9 are in bold.