茨城県菅生沼における平水時の水,懸濁物質および底質中の農薬濃度変動と負荷量 Concentration and loading of several pesticides in water, suspended solids and sediment during ordinary water discharge in Sugao marsh, Ibaraki Prefecture, Japan

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Abstract

平水時における, エスプロカルブ, チオベンカルブ, ジメタメトリン, プレチラクロール, シメトリンについて, 水, 懸濁物質および底質中の年間を通した濃度変動を茨城県菅生沼において調査した.その結果, 水および懸濁物質中の農薬濃度変動は同様な傾向を示し, 農薬のほとんどは溶存態として存在していた.農薬の懸濁物質への分配割合は中央値で0.37-2.5%であった.また, 懸濁物質による農薬負荷量が負荷量全体に占める割合は0.42-4.6%であった.懸濁物質試料の細粒画分(0.5-1.0μm)中の農薬濃度は粗粒画分(1.0μm以上)中のそれより高かった.そして, 細粒画分による農薬負荷量は, 全懸濁物質による負荷量の18から59%を占めていると見積もられ, 細粒画分が農薬の移動担体として重要であることが示唆された.底質表層0-5, 5-15cmの試料中では農薬の垂直濃度分布に一定の傾向は認められず, 底質中の農薬濃度には, 水流による底質表層の撹乱が影響すると考えられた.

Concentrations of esprocarb, thiobencarb, dimethametryn, pretilachlor and simetryn in water, suspended solids and sediment were studied during ordinary water discharge over the course of a year in Sugao marsh, Ibaraki Prefecture, Japan. Periodic changes in pesticide concentrations in water were similar to those in suspended solids. Pesticides were mostly present as dissolved form in water. Namely, the partition ratios of total suspended solids in whole water samples were 0.37-2.5% as the median, and the ratios of pesticide loading as adsorbed form on suspended solids against total pesticide loading were 0.42-4.6%. However, the concentrations of pesticides were higher in fine suspended solids (0.5 to 1.0μm) than coarse suspended solids (more than 1.0μm). Fine suspended solids loaded with pesticides were estimated to be 18 to 59% of all suspended solids, indicating their important role as a carrier of pesticides. Moreover, vertical distributions of pesticides in sediment down to a depth of 15cm were not clearly shown, probably due to the disturbance of sediment at the surface by actual water flow.

Journal

  • Journal of pesticide science

    Journal of pesticide science 31(1), 6-13, 2006-02-20

    日本農薬学会

References:  21

Cited by:  5

Codes

  • NII Article ID (NAID)
    110004085890
  • NII NACSIS-CAT ID (NCID)
    AA11818622
  • Text Lang
    ENG
  • Article Type
    Journal Article
  • ISSN
    1348589X
  • NDL Article ID
    7850004
  • NDL Source Classification
    ZR7(科学技術--農林水産--農産)
  • NDL Call No.
    Z18-1132
  • Data Source
    CJP  CJPref  NDL  NII-ELS  NDL-Digital 
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