Lub Koom Haum Tiv Thaiv Ib Puag Ncig ntawm Tebchaws Meskas (EPA) tab tom thov kom txwv tsis pub siv feem ntau ntawm dichloromethane (methylene chloride) raws li Txoj Cai Tswj Xyuas Cov Khoom Lom Zem (TSCA), uas tswj hwm txoj cai tshuaj lom neeg ntawm Tebchaws Meskas. Dichloromethane yog cov tshuaj yaj hauv chaw kuaj mob uas siv dav hauv cov khoom xws li cov nplaum, cov tshuaj sealant, cov tshuaj degreasers thiab cov tshuaj pleev xim nyias. Nws yog cov tshuaj thib ob uas yuav tsum tau tswj hwm raws li cov txheej txheem Tsca uas tau hloov kho dua tshiab, tsim nyob rau xyoo 2016, tom qab asbestos xyoo tas los.
Daim ntawv thov ntawm EPA hu kom txwv tsis pub tsim, ua thiab faib cov dichloromethane rau txhua yam kev siv rau cov neeg siv khoom, txwv tsis pub siv feem ntau hauv kev lag luam thiab kev lag luam, thiab tswj hwm qhov chaw ua haujlwm nruj rau lwm yam kev siv.
Kev siv methylene chloride hauv chaw kuaj mob yuav raug tswj hwm los ntawm qhov kev pab cuam thiab yuav raug tswj hwm los ntawm txoj kev npaj tiv thaiv tshuaj lom neeg hauv chaw ua haujlwm, tsis yog kev txwv. Txoj kev npaj no txwv tsis pub muaj kev raug tshuaj lom neeg hauv chaw ua haujlwm ntau tshaj 2 feem ib lab (ppm) rau 8 teev thiab 16 ppm rau 15 feeb.
Daim Ntawv Qhia Tshiab ntawm EPA Yuav Tso Cov Kev Txwv Tshiab rau Cov Qib Kev Raug Dichloromethane hauv Cov Chaw Kuaj Mob
Lub Chaw Tiv Thaiv Ib Puag Ncig tau txheeb xyuas qhov kev pheej hmoo ntawm kev cuam tshuam tsis zoo rau tib neeg kev noj qab haus huv los ntawm kev ua pa thiab kev raug rau ntawm daim tawv nqaij rau methylene chloride, suav nrog kev ua rau lub hlwb tsis zoo thiab cov teebmeem rau lub siab. Lub koom haum kuj pom tias kev ua pa ntev thiab kev raug rau ntawm daim tawv nqaij rau cov tshuaj no ua rau muaj kev pheej hmoo ntawm mob qog noj ntshav ntau ntxiv.
Thaum tshaj tawm cov lus pom zoo ntawm lub koom haum rau lub Plaub Hlis 20, EPA Tus Thawj Coj Michael Regan tau hais tias: "Kev tshawb fawb tom qab methylene chloride yog qhov tseeb thiab nws cov teebmeem tuaj yeem ua rau muaj kev cuam tshuam loj rau kev noj qab haus huv thiab txawm tias tuag. Muaj ntau tus neeg tau poob cov neeg hlub rau kev lom neeg hnyav. "tsev neeg".
Txij li xyoo 1980, tsawg kawg yog 85 tus neeg tau tuag los ntawm kev raug tshuaj methylene chloride, raws li EPA. Feem ntau ntawm lawv yog cov neeg ua haujlwm kho vaj tse, qee tus ntawm lawv tau kawm tiav thiab hnav cov khoom siv tiv thaiv tus kheej. Lub koom haum tau hais tias muaj ntau tus neeg ntxiv "tab tom ntsib teeb meem kev noj qab haus huv hnyav thiab ntev, suav nrog qee hom mob qog noj ntshav."
Thaum lub sijhawm Obama tswj hwm, Lub Chaw Tiv Thaiv Ib Puag Ncig tau txiav txim siab tias cov tshuaj pleev xim uas muaj methylene chloride ua "muaj kev pheej hmoo tsis tsim nyog ntawm kev raug mob rau kev noj qab haus huv." Xyoo 2019, lub koom haum tau txwv tsis pub muag cov khoom zoo li no rau cov neeg siv khoom, tab sis nws tau raug foob los ntawm cov neeg tawm tswv yim kev noj qab haus huv pej xeem uas tau sib cav tias cov cai tsis tau mus deb txaus thiab tias yuav tsum tau ua cov kev ntsuas nruj dua sai dua.
Lub EPA xav tias feem ntau ntawm nws cov kev hloov pauv tshiab yuav raug siv tag nrho hauv 15 lub hlis thiab suav nrog 52 feem pua ​​​​​​txwv tsis pub muaj kev tsim khoom txhua xyoo rau TSCA kawg. Lub koom haum tau hais tias rau feem ntau ntawm cov dichloromethane siv nws pom zoo kom txwv, cov khoom lag luam lwm yam feem ntau muaj nyob rau tib tus nqi.
Tab sis American Chemical Council (ACC), uas sawv cev rau cov tuam txhab tshuaj lom neeg hauv Asmeskas, tau tawm tsam nrog EPA tam sim ntawd, hais tias methylene chloride yog "cov khoom tseem ceeb" siv los ua ntau yam khoom siv rau cov neeg siv khoom.
Ua teb rau EPA cov lus tshaj tawm, pawg neeg kev lag luam tau hais tias qhov no yuav "ua rau muaj kev tsis paub meej thiab kev tsis meej pem ntawm txoj cai" rau qhov kev txwv kev raug tshuaj methylene chloride tam sim no ntawm US Occupational Safety and Health Administration. ACC hais tias EPA tsis tau "txiav txim siab tias nws yog qhov tsim nyog" los teeb tsa cov kev txwv kev raug tshuaj ntxiv rau cov uas twb tau teeb tsa lawm.
Cov neeg sawv cev kuj tau liam tias EPA tsis tau soj ntsuam tag nrho qhov cuam tshuam ntawm nws cov lus pom zoo rau cov khoom xa tuaj. "Qhov loj ntawm kev txiav cov khoom lag luam sai sai no yuav muaj kev cuam tshuam loj rau cov khoom xa tuaj yog tias cov chaw tsim khoom muaj cov luag haujlwm cog lus uas lawv yuav tsum ua raws li, lossis yog tias cov chaw tsim khoom txiav txim siab tso tseg kev tsim khoom tag nrho," ACC ceeb toom. cuam tshuam rau cov ntawv thov tseem ceeb, suav nrog cov khoom xa tuaj tshuaj thiab qee qhov EPA-txhais cov ntawv thov tseem ceeb uas rhiab heev rau xeb.
EPA txhawb nqa kev txwv tsis pub siv cov khoom siv rau cov neeg siv khoom uas tau tos ntev tab sis tso cai rau kev siv lag luam txuas ntxiv mus
Qhov kev kho dua tshiab ntawm Txoj Cai Tswj Xyuas Cov Tshuaj Lom Zem uas tau tos ntev los lawm, uas tswj hwm kev tswj hwm cov tshuaj lom neeg hauv Tebchaws Meskas, tau pib siv lawm.
Daim ntawv tshaj tawm ntawm UK House of Commons qhia tau hais tias tsoomfwv yuav tsum ua lub luag haujlwm ntau dua hauv kev daws teeb meem cuam tshuam rau kev tshawb fawb.
NASA lub Cassini probe pom cov hmoov av thiab dej khov nyob ib puag ncig lub ntiaj teb tsuas yog ob peb puas lab xyoo xwb
© Royal Society of Chemistry daim ntawv sau npe (Hnub Tim Tshiab). Tau Txais Xyoo Tag Nrho ()); Tus lej rau npe ua haujlwm pabcuam: 207890