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Size Distributions of Soil Particles Adhered to Children’s Hands

  • Naomichi YamamotoEmail author
  • Yuko Takahashi
  • Jun Yoshinaga
  • Atsushi Tanaka
  • Yasuyuki Shibata
Article

Abstract

The size distributions of the soil particles adhered to children’s hands were preliminarily investigated and compared with a cutoff soil particle size recently specified in the official analytical method in Japan. To facilitate fieldworks involving child participants, we tested a methodology using a laser scattering particle size distribution analyzer and validated it for field applications. The laboratory experiments using this method showed finer soil particles tended to be adhered more efficiently to human hands. Meanwhile, our preliminary field survey revealed large variations in mass (mean 26.2 mg/hand, median 15.2 mg/hand, max 162.5 mg/hand) and size distributions (particle mode diameter of 39 ± 26 μm) of the particles adhered to children’s hands after various playing activities. Even though the ways the particles adhered were noticeably varied under actual playing situations, the adhered particles were consistently and considerably smaller than the 2-mm cutoff diameter defined by the Ministry of the Environment, Japan. Since soil contaminant concentrations are generally higher for finer soil particles, measurement of contaminant concentrations for the soil fraction including the non-adherent millimeter particles may underestimate the risk of direct soil contaminant intakes.

Keywords

Soil Particle Human Hand Reference Soil Laser Transmittance Soil Contaminant 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

Notes

Acknowledgments

The authors thank Ms. O. Tsumashima as well as children of the Kawasaki City Nursery School for kindly providing us the sampling opportunity and participating in the field survey. Thanks are also due to Ms. M. Yoshikane and Y. Kanda of the National Institute for Environmental Studies for their assistance in the HORIBA LA-300 operation.

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Copyright information

© Springer Science+Business Media, Inc. 2006

Authors and Affiliations

  • Naomichi Yamamoto
    • 1
    Email author
  • Yuko Takahashi
    • 2
  • Jun Yoshinaga
    • 1
  • Atsushi Tanaka
    • 3
  • Yasuyuki Shibata
    • 3
  1. 1.Department of Environmental System, Institute of Environmental Studies, Graduate School of Frontier SciencesUniversity of TokyoBunkyo-kuJapan
  2. 2.Faculty of Hygienic Technology, School of Allied Health SciencesKitasato UniversitySagamihara-shiJapan
  3. 3.National Institute for Environmental StudiesTsukuba-shiJapan

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