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首页> 外文期刊>Journal of Environmental Science and Health >Effect of the particle size and surface area on Escherichia coli attachment to mineral particles in fresh water
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Effect of the particle size and surface area on Escherichia coli attachment to mineral particles in fresh water

机译：粒径和表面积对淡水中矿物颗粒的大肠杆菌附着的影响

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摘要

The objective of this study was to assess the effects of the particle size and specific surface area (SSA) on the attachment of Escherichia coli to sediment particles. To exclude the effect of different sediment mineral compositions, pure minerals were used, and three typical suspended sediment (62 mu m) components, quartz, K-feldspar and calcite, were separated into four groups with different grain size distributions. Equilibrium attachment experiments covering common E. coli concentrations in surface water were conducted for each group. The results show that the finer fractions of each pure mineral had the greatest attachment capacity. Different mineral properties were measured, as well as an author-defined parameter (SSA_a), which was calculated by integrating the particle size distribution and only reflected the microscopic surface areas accessible to E. coli cells (similar to 1 mu m) while excluding the effects of nanoscopic pores (5-10 nm). Pearson correlation and partial correlation analyses suggested that the partition coefficient (K-d) was positively correlated with the clay content (CC) and SSA_a (P 0.01). Stepwise multiple regression analysis suggested that SSA_a was the dominant factor (P 0.01) and was a better explanatory variable than CC. Moreover, in addition to SSA_a, the zeta potential and SSA also partially explained the results (P 0.05).
机译：本研究的目的是评估粒度和比表面积（SSA）对大肠杆菌与沉积物颗粒的附着的影响。为了排除不同沉积物矿物组合物的效果，使用纯矿物，并将三种典型的悬浮沉积物（<62μm）组分，石英，K-长石和方解石分离成四组，具有不同的晶粒尺寸分布。每组对覆盖表面水中共同大肠杆菌浓度的平衡附着实验。结果表明，每个纯矿物质的细分级数具有最大的附着力。测量不同的矿物质，以及作者定义的参数（SSA_A），其通过整合粒度分布来计算，并且仅反射大肠杆菌细胞（类似于1μm）的微观表面区域，同时排除纳米镜孔（5-10nm）的影响。 Pearson相关性和部分相关分析表明分区系数（K-D）与粘土含量（CC）和SSA_A呈正相关（P <0.01）。逐步多元回归分析表明，SSA_A是显性因素（P <0.01），并且是比CC更好的解释性变量。此外，除了SSA_A之外，Zeta电位和SSA还部分解释了结果（P <0.05）。

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  • 来源
    《Journal of Environmental Science and Health》 |2019年第12期|1219-1226|共8页
  • 作者

    Wu Tao; Liu Zhongxiang; Zhu Dejun; Chen Yongcan;

  • 作者单位

    Tsinghua Univ State Key Lab Hydrosci & Engn Beijing 100084 Peoples R China;

    Tsinghua Univ State Key Lab Hydrosci & Engn Beijing 100084 Peoples R China;

    Tsinghua Univ State Key Lab Hydrosci & Engn Beijing 100084 Peoples R China;

    Tsinghua Univ State Key Lab Hydrosci & Engn Beijing 100084 Peoples R China|Southwest Univ Sci & Technol 59 Qinglong Rd Mianyang Sichuan Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Escherichia coli; attachment; partition coefficient; particle size; surface area;

    机译：大肠杆菌;附件;分区系数;粒度;表面积;

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