2-Methyl-4-chlorophenoxyacetic Acid (MCPA) Txheej txheem cej luam
Ib, Introduction
2-methyl-4-chlorophenoxyacetic acid (MCPA) yog lub zog, xaiv, thiab siv dav siv phenoxy herbicide. Nws yog thawj zaug qhia hauv xyoo 1945.
2, Khoom thiab Daim Ntawv Thov
Raws li tshuaj tua kab mob: MCPA yog ua hauj lwm nyob rau hauv daim ntawv ntawm nws cov ntsev los yog esters los tswj broadleaf weeds xws li thistle thiab dock nyob rau hauv cereal qoob loo thiab pastures. Nws qhia txog kev xaiv rau cov nroj tsuag nrog nplooj dav, nrog rau feem ntau cov ntoo deciduous. Clovers kuj ua siab ntev ntawm cov ntawv thov nruab nrab. Tam sim no, nws raug cais raws li kev txwv - siv tshuaj tua kab hauv Tebchaws Meskas. Lub US Geological Survey maps nws cov kev siv, thiab cov ntaub ntawv qhia tau hais tias siv zoo ib yam txij li thaum 1992, nrog ib tug me ntsis tsis ntev los no poob nyob rau hauv lub kaum xyoo ua rau mus txog rau 2017. Tam sim no, lub compound yog yuav luag tsuas yog siv nyob rau hauv cov nplej.
Cov hauv qab no yog cov chaw siv ntawm cov khoom:
Kev siv tshuaj lom neeg: Vim nws tus nqi qis, MCPA yog siv rau hauv ntau yam kev siv tshuaj. Nws pab pawg carboxylic acid ua rau muaj kev sib txuam nrog cov hlau, thiab nws cov kua qaub ua haujlwm ua rau nws muaj ntau yam khoom siv nruab nrab rau ntau qhov sib txawv.
Cov hauv qab no yog cov chaw siv ntawm cov khoom:
3, Hom Kev Ua Haujlwm
MCPA ua haujlwm raws li auxin, ua raws li kev txiav txim ntawm cov nroj tsuag loj hlob hormone auxin. Nws yog absorbed los ntawm nplooj thiab translocated mus rau meristems ntawm cov nroj tsuag, ua rau nyob rau hauv uncontrolled kev loj hlob thiab thaum kawg tuag ntawm susceptible nroj tsuag, feem ntau dicotyledons. Qhov no ua rau qia curling, nplooj wilting, thiab qhov kawg ntawm cov nroj tsuag demise.
4, Herbicidal Activity thiab muaj peev xwm txaus ntshai
2-Methyl-4-chlorophenoxyacetic acid yog sodium ntsev ntawm 2-methyl-4-chlorophenoxyacetic acid. Nws inhibits photosynthesis los ntawm kev cuam tshuam cov saw hlau thauj khoom hauv chloroplasts. Cov pab pawg hydroxyl ntawm lub nplhaib phenoxy yog lub luag haujlwm rau nws cov tshuaj tua kab mob. Nws tau raug pom tias ua rau cov cell tuag tseem ceeb hauv cov ntaub so ntswg kab lis kev cai thiab yuav muaj peev xwm carcinogenic. Txawm li cas los xij, tsis muaj kev tshawb fawb toxicological tau ua rau tib neeg lossis tsiaj.
Yog tias koj xav paub ntxiv, thov nyem rau ntawm daim duab saum toj no!