Case Study of the Relationship between Aqua Regia and Real Total Contents of Harmful Trace Elements in Some European Soils

Table 1

Characteristics of samples.

No.	Chemical elements and number of laboratory measurements of both real total and aqua regia contents	Lithology, country	CL	LOI	Ca
986	Ag3, As49, B7, Ba31, Be16, Cd37, Co47, Cr85, Cu89, Hg37, Mn89, Mo27, Ni77, Pb85, Sb18, Se8, Sn13, U8, V52, Zn105	Sandy soil/NL	2.0	3.6	1.2
919	As26, B2, Ba11, Be9, Cd24, Co21, Cr44, Cu45, Hg22, Mn38, Mo14, Ni40, Pb42, Sb9, Se5, Sn6, U4, V19, Zn51	Sandy soil/NL	3.3	4.8	2.1
997	As24, B7, Ba15, Be12, Cd30, Co23, Cr51, Cu52, Hg29, Mn50, Mo14, Ni49, Pb49, Sb11, Se6, Sn7, U3, V23, Zn52	Sandy soil/NL	4.0	4.3	3.7
995	Ag6, As56, B8, Ba29, Be20, Cd79, Co63, Cr109, Cu114, Hg52, Mn90, Mo44, Ni119, Pb110, Sb31, Se9, Sn29, U11, V56, Zn114	Sandy soil/NL	4.2	5.3	4.3
958	As33, B3, Ba15, Be11, Cd20, Co30, Cr50, Cu52, Hg28, Mn42, Mo17, Ni50, Pb52, Sb11, Se6, Sn11, U6, V30, Zn59	Sandy soil/NL	4.7	2.8	0.9
867	As13, B1, Ba6, Be4, Cd10, Co15, Cr18, Cu21, Hg10, Mn20, Mo11, Ni21, Pb16, Sb5, Se1, Sn3, U2, V12, Zn24	Forest sandy soil/NL	5.1	8.5	0.4
918	As27, B3, Ba10, Be9, Cd17, Co17, Cr39, Cu39, Hg18, Mn39, Mo13, Ni33, Pb38, Sb7, Se4, Sn3, U3, V20, Zn43	Sandy soil/NL	6.0	6.0	3.3
961	As74, B7, Ba33, Be27, Cd52, Co72, Cr104, Cu101, Hg56, Mn99, Mo29, Ni103, Pb105, Sb26, Se11, Sn21, U10, V64, Zn114	Clay/NL	13.4	3.9	4.0
992	As22, B6, Ba11, Be11, Cd18, Co23, Cr33, Cu31, Hg16, Mn27, Mo18, Ni32, Pb31, Sb8, Se7, Sn21, U3, V19, Zn38	Sandy clay soil/NL	14.7	6.8	29.7
885	As16, B3, Ba7, Be6, Cd10, Co18, Cr24, Cu27, Hg13, Mn24, Mo5, Ni23, Pb20, Sb6, Se4, Sn5, U2, V13, Zn27	Braunerde pseudogley/CH	15.0	4.9	3.8
884	As28, B4, Ba12, Be9, Cd20, Co32, Cr39, Cu39, Hg23, Mn39, Mo17, Ni46, Pb40, Sb10, Se7, Sn9, U4, V20, Zn51	Braunerde/CH	19.3	6.7	7.8
881	As26, B2, Ba11, Be7, Cd21, Co26, Cr40, Cu40, Hg21, Mn33, Mo12, Ni37, Pb40, Sb11, Se7, Sn8, U4, V17, Zn49	Clay/NL	20.0	3.9	40.2
900	As27, B5, Ba10, Be12, Cd19, Co26, Cr31, Cu37, Hg20, Mn38, Mo15, Ni36, Pb36, Sb3, Se3, Sn7, U3, V20, Zn37	Calcareous brown soil/CH	21.8	5.4	12.1
865	As16, B2, Ba7, Be4, Cd7, Co13, Cr22, Cu10, Hg11, Mn14, Mo10, Ni17, Pb19, Sb3, Se2, Sn6, U4, V13, Zn21	Loamy soil/CH	22.0	27.1	2.4
889	As29, B3, Ba11, Be11, Cd22, Co32, Cr41, Cu40, Hg16, Mn37, Mo16, Ni40, Pb37, Sb11, Se2, Sn8, U3, V21, Zn45	Soil with high carbonate/ES	24.5	5.5	145
962	Ag3, B4, Ba14, Be11, Cd19, Co29, Cr44, Cu31, Hg22, Mn35, Mo14, Ni39, Pb35, Sb6, Se6, Sn12, U6, V24, Zn44	Sandy clay/NL	35.8	5.7	38.9
872	Ag4, B3, Ba18, Be11, Cd23, Co30, Cr47, Cu46, Hg26, Mn38, Mo13, Ni45, Pb41, Sb12, Se4, Sn14, U7, V27, Zn46	Braunerde clay/CH	40.8	9.0	53.9
909	As24, B4, Ba10, Be13, Cd22, Co25, Cr46, Cu42, Hg20, Mn33, Mo12, Ni44, Pb34, Sb10, Se4, Sn9, U2, V22, Zn49	Marshland/CH	43.5	29.9	21.6
910	As27, B4, Ba11, Be12, Cd21, Co31, Cr37, Cu41, Hg22, Mn40, Mo11, Ni42, Pb39, Sb10, Se9, Sn8, U2, V20, Zn49	Clay soil/NL	58.9	11.4	6.9

No.: sample number in WEPAL ISE program; country of sampling is given after slash: NL: the Netherlands, CH: Switzerland, and ES: Spain; CL: median content of clay particles, that is, fraction <2 𝜇m, %; LOI: median content of loss on ignition, %; Ca: median content of Ca, g/kg.