Table 1. Heavy metal concentrations in water, sediments and soil for different land uses along the Shunde Waterway.

Land use and media	As	Hg	Cd	Zn	Pb	Cu	Cr	Ni
Soils	Mean ± Std. Deviation [Minimum, Maximum] (mg/kg)
Riverbank vegetable plot (RVS)	72.3 ± 26.8	0.39 ± 0.12	2.25 ± 1.13	358.6 ± 249.6	100.3 ± 26.1	61.7 ± 20.4	71.5 ± 4.3	27.5 ± 5.2
	[34.7, 106.3]	[0.25, 0.59]	[1.02, 4.01]	[170.2, 907.7]	[59.0, 125.5]	[39.1, 99.6]	[66.7, 77.4]	[21.4, 36.2]
Riverbank green space (RGS)   (0–20 cm)	42.5 ± 34.2	0.29 ± 0.10	1.02 ± 0.77	262.6 ± 354.9	80.6 ± 84.3	37.8 ± 21.6	66.8 ± 9.8	22.1 ± 5.0
	[14.9, 133.4]	[0.12, 0.45]	[0.28, 2.44]	[85.1, 1408.3]	[28.1, 324.7]	[10.4, 91.7]	[51.6, 87.4]	[14.6, 32.6]
Private vegetable plot (PVS)   (0–20 cm)	17.5 ± 3.6	0.40 ± 0.41	0.55 ± 0.41	124.5 ± 59.3	36.8 ± 16.7	32.5 ± 17.8	68.6 ± 16.1	26.5 ± 10.8
	[12.6, 25.5]	[0.12, 1.43]	[0.12, 1.68]	[64.3, 289.1]	[21.1, 76.2]	[8.4, 66.3]	[42.1, 100.9]	[7.4, 42.8]
Public green space (PGS)   (0–20 cm)	18.5 ± 7.6	0.24 ± 0.16	0.44 ± 0.22	111.6 ± 36.1	31.4 ± 12.0	18.8 ± 9.6	61.8 ± 10.8	19.2 ± 7.9
	[11.5, 47.0]	[0.03, 0.66]	[0.21, 1.16]	[59.1, 212.7]	[11.9, 56.0]	[5.1, 40.6]	[46.1, 78.7]	[3.0, 29.9]
Total Soils (0–100 cm)	27.8 ± 20.5	0.41 ± 0.24	1.29 ± 1.02	181.8 ± 158.0	52.5 ± 35.8	49.2 ± 28.1	73.3 ± 14.6	31.8 ± 7.3
	[11.6, 62.7]	[0.17, 0.74]	[0.43, 2.97]	[85.9, 501.5]	[26.9, 123.7]	[26.5, 103.9]	[52.0, 96.5]	[21.2, 41.0]
River
surface sediments	47.8 ± 13.3	0.20 ± 0.12	1.76 ± 0.45	311.0 ± 118.1	93.3 ± 44.7	93.5 ± 58.4	106.0 ± 78.5	29.8 ± 8.0
	[22.7, 66.6]	[0.06, 0.51]	[0.65, 2.19]	[136.8, 481.8]	[29.8, 163.7]	[40.2, 236.0]	[54.2, 321.6]	[17.6, 39.8]
	Mean ± Std. Deviation [Minimum, Maximum] (μg/L)
surface water	3.2 ± 1.1	0.02 ± 0.01	0.10 ± 0.07	12.6 ± 4.0	2.3 ± 2.5	3.8 ± 2.2	2.4 ± 4.3	2.3 ± 2.0
	[2.2, 5.4]	[0.01, 0.03]	[0.03, 0.25]	[5.9, 19.4]	[0.7, 9.0]	[2.0, 8.0]	[0.5, 14.6]	[1.2, 7.6]
Soil backgrounds	Heavy metal Background values in soil (mg/kg)28
	16.2	0.26	0.44	109.6	50.1	43.8	62.0	32.6