Streptococcus suis sorption on agricultural soils: Role of soil physico-chemical properties

被引:10
|
作者
Zhao, Wenqiang [1 ]
Liu, Xing [1 ]
Huang, Qiaoyun [1 ,2 ]
Cai, Peng [1 ,2 ]
机构
[1] Huazhong Agr Univ, State Key Lab Agr Microbiol, Wuhan 430070, Peoples R China
[2] Huazhong Agr Univ, Key Lab Arable Land Conservat Middle & Lower Reac, Minist Agr, Wuhan 430070, Peoples R China
基金
中国国家自然科学基金;
关键词
Streptococcus suis; Sorption; Partition coefficient; Soil properties; Statistical correlation; ESCHERICHIA-COLI O157H7; PSEUDOMONAS-PUTIDA; SOLUTION CHEMISTRY; ADHESION KINETICS; CLAY-MINERALS; ADSORPTION; ATTACHMENT; TRANSPORT; BACTERIA; MANURE;
D O I
10.1016/j.chemosphere.2014.05.060
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Understanding pathogen sorption on natural soil particles is crucial to protect public health from soilborne and waterborne diseases. Sorption of pathogen Streptococcus suis on 10 agricultural soils was examined, and its correlations with soil physico-chemical properties were also elucidated. S. suis sorption isotherms conformed to the linear equation, with partition coefficients (K-s) ranging from 12.7 mL g(-1) to 100.1 mL g-1. Bacteria were observed to sorb on the external surfaces of soil aggregates by scanning electron microscopy. Using Pearson correlation and linear regression analysis, solution pH was found to have significant negative correlations with ICE. Stepwise multiple regression and path analysis revealed that pH and cation exchange capacity (CEC) were the main factors influencing sorption behaviors. The obtained overall model (K-s = 389.6 - 45.9 x pH 13 x CEC, R-2 = 0.943, P < 0.001) can accurately predict K-s values. However, the variability in K-s was less dependent on soil organic matter, specific surface area, soil texture and zeta potential, probably due to the internal-surface shielding phenomenon of soil aggregates. Additionally, the sorption trends cannot be interpreted by interaction energy barriers calculated using the Derjaguin-Landau-Verwey-Overbeek (DLVO) theory, suggesting the limits of DLVO theory in describing pathogen sorption on natural soils. Our results also indicated soil pH and CEC should be preferentially considered when modeling S. suis sorption process. (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码:52 / 58
页数:7
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