Micromorphological and Chemical Approaches to Understand Changes in Ecological Functions of Metal-Impacted Soils under Various Land Uses

Table 7

Concentrations (mg kg⁻¹) of potential toxic metals for each solid phase and soil use.

		Industral			Urban		Natural		Agricultural
Metal	Solid phase	A	C1	C2	A	C1	A	C1	A	C2
Fe	Exchangeables	10.52	6.25	4.02	0.85	1.51	0.89	0.75	0.45	0.35
	Carbonates	137	108	82.8	52.7	199	78.3	91.3	75.9	67.4
	Oxidizable	1004	309	1289	661	956	227	217	507	520
	Reducible/residuals	18574	20548	18745	24587	26458	15478	11985	26478	25487
	Sum	19726	20971	20121	25301	27614	15784	12294	27062	26075
	Total	20831	19696	19195	26444	25080	14999	12554	24827	24520
	% recovery	95	106	105	96	110	105	98	109	106
Mn	Exchangeables	4.12	2.58	3.98	5.49	3.58	0.75	0.54	2.27	2.84
	Carbonates	111.2	39.9	80.1	147	99.9	105	88.8	99.0	95.2
	Oxidizable	92.8	72.0	110	50.9	104	38.0	53.2	144	150
	Reducible/residuals	146	225	80.5	313	202	129	80.5	252	213
	Sum	354	340	274	516	409	273	223	497	461
	Total	338	319	244	449	396	283	221	450	444
	% recovery	105	106	112	115	103	96	101	110	104
Zn	Exchangeables	5.2	1.35	5.93	3.02	0.98	0.35	0.84	0.51	0.47
	Carbonates	391	10.68	7.82	185	37.4	58.6	66.7	98.8	93.7
	Oxidizable	411	8.98	6.71	99.2	46.6	27.3	5.12	87.5	90.9
	Reducible/residuals	266	902	52.7	266	70.2	155	90.4	191	121
	Sum	1072	923	73.1	553	155	241	163	377	306
	Total	1002	796	65	523	163	212	143	342	331
	% recovery	107	116	112	106	95	114	114	110	92
Cu	Exchangeables	nd	nd	nd	1.4	0.93	0.77	nd	0.51	nd
	Carbonates	14.6	7.97	6.16	21.3	14.7	5.94	3.83	2.17	nd
	Oxidizable	6.21	3.31	2.57	17.6	13.6	1.79	1.52	9.17	9.75
	Reducible/residuals	7.29	8.32	11.2	15.1	25.6	9.69	10.5	15.7	12.5
	Sum	30.6	18.6	19.9	55.5	54.9	18.1	15.8	27.6	22.2
	Total	28.1	19.6	17.1	48	46.9	15.1	13.9	23.6	17.9
	% recovery	109	95	117	116	117	120	114	117	124
Pb	Exchangeables	nd	nd	nd	nd	nd	nd	nd	nd	nd
	Carbonates	10.1	15.18	3.54	326	272	112	76.6	57.8	25.6
	Oxidizable	4.64	5.25	1.51	29.6	15.5	20.2	20.5	26.3	17.0
	Reducible/residuals	50.2	90.2	5.21	125	135	135	102	65.8	68.2
	Sum	64.9	110	10.26	481	423	268	199	150	111
	Total	58.2	103	8.5	411	400	248	179	128	88.1
	% recovery	112	107	121	117	106	108	111	117	127

n.d.: not detected.