Case Study of the Relationship between Aqua Regia and Real Total Contents of Harmful Trace Elements in Some European Soils
Table 2
Statistical characteristics of WEPAL ISE European soil samples compared to other sources.
VAR
MIN
MAX
MEDIAN
NEmed
EUmed
LTmed
SV
LTsv
AgRT
0.05
2.90
0.23
“—”
0.27
0.07
“—”
2
AgAR
0.02
2.86
0.10
“—”
“—”
“—”
“—”
AsRT
1.49
29.7
9.69
3.2
7.0
2.5
5–300
10
AsAR
1.10
25.0
7.75
1.9
6.0
“—”
“—”
BRT
13.0
118
47.9
“—”
“—”
26
“—”
50
BAR
3.58
36.8
17.2
“—”
“—”
“—”
“—”
BaRT
129
556
252
402
375
345
285–2000
600
BaAR
7.95
368
55.4
46
65
“—”
“—”
BeRT
0.25
3.12
1.19
1.17
<2
1.0
2–30
10
BeAR
0.07
2.03
0.60
“—”
“—”
“—”
“—”
CdRT
0.08
12.9
0.30
“—”
0.15
0.15
1–20
3
CdAR
0.07
12.8
0.32
0.13
“—”
“—”
“—”
CoRT
0.79
18.5
7.62
5.3
7.8
4.3
20–300
30
CoAR
0.58
15.7
6.42
4.1
7.0
“—”
“—”
CrRT
11.2
134
77.5
28.5
60
30
50–1000
100
CrAR
5.58
117
36.8
12.0
22
“—”
“—”
CuRT
5.86
65.5
14.8
10.5
13.0
8.1
100–1000
100
CuAR
4.66
64.7
13.2
7.8
12.0
“—”
“—”
HgRT
0.021
0.29
0.057
“—”
0.037
0.075
0.500–56
1.5
HgAR
0.022
0.27
0.055
“—”
“—”
“—”
“—”
MnRT
54.1
1530
404
426
503
427
“—”
1500
MnAR
32.1
1462
380
255
382
“—”
“—”
MoRT
0.26
4.70
1.05
<2
0.62
0.64
5–200
5
MoAR
0.16
4.42
0.91
<3
“—”
“—”
“—”
NiRT
2.10
83.6
23.0
8.5
18
12
30–500
75
NiAR
1.50
75.0
19.4
8.0
14
“—”
“—”
PbRT
10.2
85.5
25.7
16.0
22.6
15.0
40–700
100
PbAR
6.81
71.0
21.1
8.4
15.0
“—”
“—”
SbRT
0.33
4.50
0.70
0.24
0.6
1.0
2–40
10
SbAR
0.12
2.19
0.35
<10
“—”
“—”
“—”
SeRT
0.40
13.1
0.88
<5
“—”
0.2
3–100
5
SeAR
0.15
0.9
0.26
0.14
“—”
“—”
“—”
SnRT
1.10
17.4
2.56
<2
3.0
2.1
1–900
10
SnAR
0.53
15.9
1.38
1.1
“—”
“—”
“—”
URT
0.44
3.03
2.46
1.4
2.0
2.2
“—”
20
UAR
0.17
1.96
0.80
“—”
“—”
“—”
“–”
VRT
11.5
153
54.0
38.0
60.4
32.0
90–500
150
VAR
7.66
88.2
34.1
18.0
33.0
“—”
“—”
ZnRT
10.2
232
68.3
42.5
52.0
26.0
150–3000
300
ZnAR
8.11
214
59.4
33.0
48.0
“—”
“—”
VAR: variables, that is, chemical element contents (mg/kg). The subscript RT indicates real total content and subscript AR: aqua regia content; MIN: minimum, MAX: maximum, and MEDIAN: median content of WEPAL ISE European soil samples; NEmed: median content in agrarian soil of North European countries [15], EUmed: median content in European soils [16], and “—”: no data; LTmed: median content in Lithuanian soil [13]; SV: interval of soil screening values of intermediate (warning) risk and potentially unacceptable risk (residential soil use) in Austria, Belgium (Brussels, Flanders, Walloon), Finland, The Netherlands, Germany, Denmark, Sweden, Italy, Czech Republic, Slovakia, United Kingdom, and Poland [20]; LTsv: Lithuanian soil screening values of intermediate (warning) risk [35].
