Table 1: Nickel concentration (mg*kg−1 of the dry sample) in soil and Eisenia fetida exposed to nickel. Bioaccumulation factor (BAF) was calculated from the obtained experimental values. Ni concentration in control conditions (K) was below the threshold of determination (btd).

Experimental groupGastrointestinal tractBody wallWhole bodySoil

Mean ± SD ( )Mean ± SD ( )Mean ± SD ( )Mean ± SD ( )
Kbtd (6)btd (13)btd (16)btd (4)
Ni3003,07 ± 0,78 (9)
BAF = 0,012
0,66 ± 0,14 (12)
BAF = 0,002
3,27 ± 0,12 (11)
BAF = 0,012
265,38 ± 10,78 (4)
Ni90014,95 ± 2,02* (9)
BAF = 0,017
2,48 ± 0,39* (12)
BAF = 0,003
5,12 ± 0,48 (12)
BAF = 0,006
857,57 ± 10,18 (4)

Abbreviations are explained in Section 2. Asterisk *indicates the statistically significant differences between Ni300 and Ni900 groups in the analysed organs.