Application of Biochar in the Remediation of Contaminated Soil with High Concentration of Lead and Zinc

Table 2

Basic properties of the biochar derived from the rice straw.

Technical index	Value	Testing standard or method
pH (S/W = 1 : 1)	8.51	ASTM D4972-13 (ASTM 2013) [18]
Total C content (g/kg)	471.4	—
Total N content (g/kg)	31.3	—
Ash content (%)	6.71	ASTM D1762-84 (ASTM 2013) [22]
Specific surface area (m^2/g)	78.2	Brunauer–Emmett–Teller (BET) method
Contaminant concentration (mg/kg)	—	—
Pb	3.1	USEPA method 3050B (USEPA 1996) [20]
Zn	28	—