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Effect of Soil Grinding on Total Concentrations of As and Pb in Soil Determined by aqua regia Method

토양시료의 분쇄가 왕수분해법을 이용한 비소와 납의 전함량 분석 결과에 미치는 영향

  • An, Jinsung (Dept. of Civil & Environmental Engineering, Seoul National University) ;
  • Yu, Gihyeon (Dept. of Civil & Environmental Engineering, Seoul National University) ;
  • Nam, Kyoungphile (Dept. of Civil & Environmental Engineering, Seoul National University)
  • 안진성 (서울대학교 건설환경공학부) ;
  • 유기현 (서울대학교 건설환경공학부) ;
  • 남경필 (서울대학교 건설환경공학부)
  • Received : 2017.11.10
  • Accepted : 2018.01.15
  • Published : 2018.03.31

Abstract

The effect of soil grinding on total As and Pb concentrations determined by aqua regia method was examined. Among six field-collected, air-dried soil samples tested, soils A, B, C, and E were directly sieved through a $150-{\mu}m$ sieve without grinding and showed 2.18 to 3.03 times higher total As concentrations and 2.62 to 3.45 times higher total Pb concentrations than those of the soil samples prepared to allow all soil particles to pass through the $150-{\mu}m$ sieve by grinding. The reason can be ascribed to the fact that those soils contain fine particles (i.e., < $150{\mu}m$ in diameter) only 4.6 to 6.8% of the total soil weights. On the other hand, for D and F soils, fine particles smaller than $150{\mu}m$ accounted for 57 and 46%, respectively, so that the effect of grinding on As and Pb concentrations were relatively low (As: 1.15 and 1.23 times, Pb: 1.36 and 1.49 times, respectively). The result demonstrates that grinding prior to $150-{\mu}m$ sieving is necessary to ensure the homogeneity of soil samples and hence to obtain more accurate heavy metal concentrations in soils. This is especially true for soil samples with less fine soil particles and/or microaggregates (i.e., below $150{\mu}m$).

Keywords

References

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