Table 4 Mean concentrations of non-essential elements in analysed E. guineensis endosperms and mesocarps from each site (standard error of the mean in parentheses).

Endosperm

Na

223(33)^a

128(15)^b

112(24)^ab

Al

31(5.2)^a

17(2.9)^a

27(4.9)^a

Si

352(38)^a

303(38)^a

226(22)^a

Ti

0.33(0.016)^a

0.39(0.051)^a

0.30(< 0.01)^a

Cr

0.29(0.018)^b

0.19(0.027)^a

0.24(0.064)^ab

Co

0.013(< 0.01)^a

0.014(< 0.01)^a

0.010(< 0.01)^a

Ni

1.6(0.17)^b

2.2(0.35)^b

0.60(0.13)^a

As

 < 0.01^a

 < 0.01^a

 < 0.01^a

Sr

5.0(0.59)^a

4.6(0.32)^a

3.9(0.44)^a

Ag

 < 0.01^a

 < 0.01^a

 < 0.01^a

Cd

0.018(< 0.01)^a

0.027(< 0.01)^a

0.017(< 0.01)^a

Te

 < 0.01^a

 < 0.01^a

 < 0.01^a

Cs

0.068(0.015)^a

0.094(0.023)^a

0.13(0.022)^a

Ce

0.16(0.028)^a

0.080(0.014)^a

0.14(0.023)^a

Au

 < 0.01^a

 < 0.01^a

 < 0.01^a

Hg

 < 0.01^a

 < 0.01^a

 < 0.01^a

Pb

0.031(< 0.01)^a

0.021(< 0.01)^a

0.027(< 0.01)^a

Mesocarp

Na

213(29)^a

164(9.4)^a

180(27)^a

Al

35(6.3)^a

28(3.1)^a

31(8.6)^a

Si

328(22)^a

320(12)^a

313(38)^a

Ti

0.50(0.17)^a

0.40(0.044)^a

0.30(0.12)^a

Cr

3.8(0.28)^a

2.6(0.39)^a

4.0(1.0)^a

Co

0.070(< 0.01)^a

0.066(0.010)^a

0.060(0.012)^a

Ni

2.1(0.15)^a

1.6(0.18)^a

2.0(0.36)^a

As

 < 0.01^a

 < 0.01^a

 < 0.01^a

Sr

4.5(0.64)^a

4.4(0.47)^a

6.3(1.3)^a

Ag

 < 0.01^a

 < 0.01^a

0.010(< 0.01)^a

Cd

0.014(< 0.01)^a

0.011(< 0.01)^a

0.010(< 0.01)^a

Te

 < 0.01^a

 < 0.01^a

 < 0.01^a

Cs

0.24(0.074)^a

0.28(0.071)^a

0.73(0.082)^b

Ce

0.13(0.014)^a

0.11(0.014)^a

0.13(0.040)^a

Au

 < 0.01^a

 < 0.01^a

 < 0.01^a

Hg

 < 0.01^a

 < 0.01^a

 < 0.01^a

Pb

0.053(0.014)^a

0.047(0.011)^a

0.060(0.015)^a