[Effects of biochars produced from different sources on arsenic adsorption and desorption in soil].
By using OECD Guideline 106 batch equilibrium method, this paper studied the characteristics of As (V) adsorption and desorption in brown soil as affected by the biochars produced from dairy manure, pine needle, and corn straw. When the addition amount of the biochars was 0.5%, the maximum adsorption amount of As (V) was decreased in the order of dairy manure biochar > pine needle biochar > corn straw biochar, which was related to the basic characteristics of the biochars. The adsorption isotherm of As (V) could be well fitted by Langmuir model (R2 = 0.997). In comparing with CK, both the adsorption capacity (lgKf = 1.99-2.10) and the adsorption intensity (1/N = 0.413-0.449) of As (V) were low, and the main adsorption mechanism was physical adsorption. The desorption rate of As (V) (14.5%-18.7%) was decreased in the order of dairy manure biochar > pine needle biochar > corn straw biochar. The addition of the biochars decreased the adsorption of As (V) by brown soil, which could induce the increase of the bioavailability of As, and strengthen the toxicity of As in soil.
College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China. glz1960@163.com
Lian-Zhu
LZ
Guan
College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China.
Jing-Jing
JJ
Zhou
College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China.
Yun
Y
Zhang
College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China.
Guang-Cai
GC
Zhang
College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China.
Jin-Hai
JH
Zhang
College of Land and Environment, Shenyang Agricultural University, Shenyang 110866, China.
Zhong-Xiang
ZX
Chan
D000327:Adsorption; D000818:Animals; D001151:Arsenic / Q000737:chemistry*; D001673:Biodegradation, Environmental; D002417:Cattle; D002606:Charcoal / Q000737:chemistry*; D002681:China; D008372:Manure; D012989:Soil Pollutants / Q000737:chemistry*
D008372:Manure; D012989:Soil Pollutants; C540010:biochar; D002606:Charcoal; D001151:Arsenic