• Title/Summary/Keyword: Amitrol

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Adsorption characteristics of Amitrol, Nonylphenol, Bisphenol-A with GACs (흡착특성이 다른 내분비계 장애물질 3종, Amitrol, Nonylphenol, Bisphenol-A의 GACs에서의 흡착 특성)

  • Choi, Keun-Joo;Kim, Sang-Goo;Kwon, Ki-Won;Ji, Yong-dae;Kim, Seung-Hyun;Kim, Chang-Won
    • Journal of Korean Society on Water Environment
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    • v.20 no.3
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    • pp.256-264
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    • 2004
  • Adsorption characteristics of three endocrine disruptors, amitrol, nonylphenol, and bisphenol-A, were evaluated depending on the type and service duration of activated carbon (AC). Bituminous coal-, wood-, and coconut-based coals were tested. Bituminous coal-based AC (BCAC) had the greatest sorption capacity for the three chemicals tested, followed by wood-based AC (WAC) for nonylphenol and coconut palm-based AC (CAC) for bisphenol-A. During the column test, amitrol removal efficiency increased over time, indicating that hydrophilic endocrine disruptors are biodegraded in the AC column. Removal efficiencies of hydrophobic compounds such as nonylphenol and bisphenol-A decreased over time since the main removal mechanism was adsorption. The order of the amitrol removal was: BCAC-5.9 yr, CAC-3.l yr > BCAC-2.2 yr > BCAC-virgin > CAC-virgin > WAC-virgin > WAC-3.l yr. In general, used AC had greater removals than virgin AC. The order of the bisphenol-A removal was: CAC-virgin > BCAC-2.2 yr > CAC-3.l yr > WAC-virgin > BCAC-5.9 yr > WAC-3.l yr. The order of the nonylphenol removal was: BCAC-virgin > WAC-virgin > CAC-3.1 yr, WAC-3.1yr> BCAC-2.2 yr > BCAC-5.9 yr > CAC-3.1 yr. Bituminous coal AC performed the best over time. Endocrine disruptors such as these three compounds appear to be removed effectively by activated carbon through biodegradation and adsorption. Wood and coal based among the virgin ACs and 3.1 years used wood base among the used ACs appeared the lowest carbon usage rate(CUR) for nonylphenol removal by prediction model. Virgin and used coconut base ACs except BCAC had the lowest CUR for removal Bisphenol-A. Biodegradation of nonylphenol and Bisphenol-A did not occurred during the 9,800 bed volume experiment period. BCAC had the highest biodegradation capacity of 46% for amitrol among virgin ACs and the used coal based ACs had 33-44% higher biodegradation capacity than virgin's for amitrol so biodegradation is the effective removal technology for hydrophilic material such as amitrol.

Studies on Weed Control in Transplanted Bed of Pinus koraiensis S. et. Z and Larix leptolepis Gordon (잣나무와 일본잎갈나무 상체상(床替床)에 있어서 잡초방제(雜草防除)에 관(關)한 연구(硏究))

  • Ahn, Y.H.;Chung, J.C.;Han, S.S.
    • Korean Journal of Weed Science
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    • v.5 no.2
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    • pp.211-218
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    • 1985
  • To establish the weed control in transplanted bed of Pinus koraiensis and Larix leptolepis, alachlor, simazine, terbutryn, pendimethalin, oxyfluorfen and amitrol/2,4-D/methabenthiazuron (ustinex) were used by soil treatment and foliage application at 7days after transplantion of seedling. From the of soil treatment, grasses such as Dimeria ornithopoda, Alopecurus aequalis, Agropyron tsukushiense and Setaria verticillata were effectively controVed by 85 to 90% at the respective recommended rate of oxyfluorfen, alachlor and terbutryn. At the application rate of recommentation simazine, oxyfluorfen, pendimethalin and terbutryn respectively controlled 70 to 80% of broad-leaved weeds such as Erigeron annuus, Portulaca olearcea, Cerastium arvense, Capsella bursa-pastoris, Commelina commuis, Chenopodium hybridum and Stellaria alsine. Ustinex and oxyfluorfen were very effective for the control of perennials such as Artemisia princeps and Calystegia japonica. Initial sympton of phytotoxicity and decrease of growth in P. koreaiensis and L. leptolepis were not found by soil treatment and those in P. koraiensis was not shown by foliage application of all tested herbicides. But L. leptolepis foliage-applied with ustinex, oxyfluorfen, terbutryn and pendimethalin was great in early phytotoxicity and severe in growth inhibition.

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