Response of Escherichia coli O157:H7 survival to pH of cultivated soils

被引：15

作者：

Wang, Haizhen Z. ^{[1
]}

Wei, Gang ^{[1
]}

Yao, Zhiyuan Y. ^{[1
]}

Lou, Jun ^{[1
]}

Xiao, Kongcao C. ^{[1
]}

Wu, Laosheng S. ^{[1
]}

Wu, Jianjun J. ^{[1
]}

Xu, Jianming M. ^{[1
]}

机构：

[1] Zhejiang Univ, Inst Soil & Water Resources & Environm Sci, Zhejiang Prov Key Lab Subtrop Soil & Plant Nutr, Hangzhou 310058, Zhejiang, Peoples R China

来源：

JOURNAL OF SOILS AND SEDIMENTS | 2014年 / 14卷 / 11期

基金：

中国国家自然科学基金; 国家自然科学基金重大项目;

关键词：

Escherichia coli O157:H7; Survival; Soil pH; Clay; free Fe2O3; PERSISTENCE; PATHOGENS; MANURE; TRANSPORT; O157-H7; FATE;

D O I：

10.1007/s11368-014-0944-y

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The Escherichia coli (E. coli) O157:H7 survival dynamics in original and pH-modified agricultural soils were investigated to determinate how E. coli O157:H7 survival responded to the pH values of different soils, identify the relationships between E. coli O157:H7 survival time (t (d) ) and soil properties, and assess the potential pathogen contamination after soil pH changed. The six soil samples were collected from different provinces of China, and 18 pH-modified soil samples were obtained from original soils by treating the original soils with direct electric current. The E. coli O157:H7 cells were inoculated into 24 soils and incubated at soil moisture of -33 kPa and 25 A degrees C. The soils were sampled for determining the numbers of E. coli O157:H7 at given time intervals over the incubation. The effects of soil pH change and other properties on the t (d) values were analyzed. The t (d) values in the test soils were between 7.1-24.7 days. Results indicate that soil pH, texture, and free Fe2O3 (Fe-d) were the most important factors impacting the t (d) values in the test soils. Further, the response of E. coli O157:H7 survival to pH change varied with different soils. In the acidic soils (shorter t (d) values), the t (d) values decreased as the pH decreased and Fe-d increased, while in the neutral or alkaline soils (pH a parts per thousand yenaEuro parts per thousand 6.45, longer t (d) values), the t (d) values did not change significantly with pH. The changes of amorphous and free sesquioxides induced by pH change might strengthen the response of E. coli O157:H7 survival to soil pH. Closer attention should be paid to E. coli O157:H7 long survival in soils and its potential environmental contamination risk.

引用

页码：1841 / 1849

页数：9

共 39 条

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