Contrasting effect of phosphate on phytoavailability of arsenic and cadmium in soils supporting medicinal plants

Applied Biological Chemistry

Table 2 Linear regression equations for the estimation of As and Cd concentrations in each medicinal plant derived from available P concentration in soils

Plant species	n	Regression equation	R ²
Angelica gigas	12	Plant As^a = −1.910 + 0.022 × Av. P^c	0.533**^d
Angelica gigas	12	Plant Cd^b = 0.362 – 7.839 × 10⁻⁴ Av. P	0.297
Astragalus membranaceus	11	Plant As = 0.168 + 5.676 × 10⁻³ Av. P	0.276
Astragalus membranaceus	11	Plant Cd = 0.244 – 4.556 × 10⁻⁴ Av. P	0.441^*
Atractylodes macrocephala Koidzumi	14	Plant As = 0.217 + 4.279 × 10⁻³ Av. P	0.164
Atractylodes macrocephala Koidzumi	14	Plant Cd = 0.258 – 3.709 × 10⁻⁴ Av. P	0.199
Codonopsis lanceolata	14	Plant As = 0.015 + 6.501 × 10⁻⁴ Av. P	0.286*
Codonopsis lanceolata	14	Plant Cd = 0.343 – 3.604 × 10⁻⁴ Av. P	0.430*
Platycodon grandiflorum	18	Plant As = 0.024 + 3.855 × 10⁻⁴ Av. P	0.270*
Platycodon grandiflorum	18	Plant Cd = 0.317 – 3.325 × 10⁻⁴ Av. P	0.117
Rehmannia glutinosa	15	Plant As = 0.648 + 5.911 × 10⁻³ Av. P	0.307*
Rehmannia glutinosa	15	Plant Cd = 0.324 – 1.124 × 10⁻³ Av. P	0.415**