Design of a bio-conditioner prototype for the treatment of degraded soils: biomass production and lignite formulation for Microbacterium sp. CSB3

Chemical and Biological Technologies in Agriculture

Table 9 Heavy metal content in the LRC used for the formulation

Species	LRC		Permissible concentration in soil
Species	Contents	Uncertainty	Normal range (mg kg⁻¹)	Source
As (mg kg⁻¹)	3.9	0	< 5–40	Bowie and Thornton (1985) cited by Galán and Romero [16]
Cd (mg kg⁻¹)	2.1	0	< 1–2	Bowie and Thornton (1985) cited by Galán and Romero [16]
Cu (mg kg⁻¹)	< 40	0	5–30	EPA, (1996) cited by Mahecha et al. [39]
Pb (mg kg⁻¹)	22.5	0	10 Toxicity > 100	EPA, (1996) cited by Mahecha et al. [39]
Hg (mg kg⁻¹)	< 0.2	0	0,07–0,3	UN Economic Commission for Europe cited by Camargo-Garcia [38]
Zn (mg/Kg)	< 40	0	5–200 Toxicity > 400	Bowie and Thornton (1985) cited by Galán and Romero [16] EPA, (1996) cited by Mahecha et al. [39]