Chepfu yeMishonga Yezvipembenene Yekurima
Mishonga yezvipembenene chikamu chakakosha chemaitiro ekurima emazuva ano, ichibatsira kudzvinyirira huwandu hwezvipembenene, zvirwere zvezvirimwa, uye masora zvinogona kuderedza goho rezvirimwa. Zvisinei, pasinei nemabhenefiti ayo, mishonga yezvipembenene inokonzerawo njodzi kuhutano hwevanhu, mhuka, uye nharaunda. Kudzidza nezvemigumisiro ine chepfu yemakemikari aya kunonzi toxicology yemishonga yezvipembenene. Kuburikidza nenzira yechepfu, tinogona kunzwisisa kuti mishonga yezvipembenene inopinda sei mumuviri, kuti muviri unopindura sei, huwandu hwenjodzi yayo, uye kuti tingagadzirisa sei njodzi idzi kuti tive nechokwadi chekushandiswa kwemishonga yezvipembenene zvakachengeteka uye zvine mutoro.
Kunzwisisa chepfu yezvipembenene
Kurapa kwezvipembenene ibazi rezvekukuvadza rinoongorora hunhu hwezvipenyu zvine chepfu, nzira dzazvo dzekukuvadza, hukama pakati pemushonga nemhinduro, uye mhedzisiro yazvo pazvipenyu zvinotarirwa nezvisiri zvinotarirwa. Muchikamu chekurima, kurapa kwezvipembenene kunoumba hwaro hwekugadza mitemo yekushandisa, miganhu yezvisaririra muchikafu, mitemo yekuchengetedza mabasa, uye nzira dzekudzivirira kusvibiswa kwezvakatipoteredza.
Pfungwa huru muongororo yezvinokonzera chepfu ndeyekuti "muyero unogadzira chepfu." Izvi zvinoreva kuti chinhu chinogona kuva chakachengeteka kana chisina kubatwa zvakanyanya asi chine njodzi kana chisina kubatwa zvakanyanya, kana kuva nenjodzi kana chikaramba chichibatwa kwenguva yakareba. Nokudaro, ongororo yezvinokonzera chepfu haingotaridzi chete kana mushonga wezvipembenene "uine chepfu," asiwo kuti njodzi yacho inova yakakosha riini, sei, uye padanho ripi rekubatwa.
Nzira dzekushandisa mishonga yekuuraya zvipembenene muvanhu
Mukurima, vanhu vanowanzosangana nemishonga inouraya zvipembenene nenzira dzakasiyana-siyana:
1. Kuonekwa kweganda (ganda)
Iyi ndiyo nzira inonyanya kushandiswa nevashandi vekurima. Mishonga yekuuraya zvipembenene inogona kupinda paganda panguva yekusanganisa, kupfapfaidza, kuchenesa zvishandiso, kana kubata zvirimwa netsvina.
2. Kusangana nekufema (kufema)
Utsi, maaerosols, kana zvidimbu zvespray zvinogona kufemedzwa, kunyanya kana kupfapfaidza kukaitwa pasina michina yekudzivirira kana mumamiriro emhepo ine simba.
3. Kubuda pachena nemuromo (nemuromo)
Zvinogona kuitika nekuda kwekusvibiswa kwechikafu nechinwiwa, tsika yekusvuta kana kudya usina kugeza maoko mushure mebasa, kana kuchengetwa kwemishonga inouraya zvipembenene zvisina kuchengetedzeka.
4. Kuonekwa nemaziso (maziso)
Kupararira kwemishonga inouraya zvipembenene kunogona kukonzera kutsamwa uye kutokuvadza maziso, kunyanya nemishonga inouraya zvipembenene inokuvadza kana kuti ine simba rekunyungudutsa.
Hunhu hwenjodzi yekubatwa nechirwere ichi hunokonzerwa nehuwandu hwezvipembenene, nguva yekubatwa nechirwere ichi, nguva inoshandiswa, uye kushandiswa kwemidziyo yekudzivirira muviri (PPE).
Mugumo wemishonga inouraya zvipembenene mumuviri: ADME
Mukuongorora chepfu, rwendo rwemakemikari mumuviri runowanzotsanangurwa nepfungwa yeADME: Absorption, Distribution, Metabolism, and Excretion.
– Kunyudzwa: Kuti mushonga wezvipembenene unopinda mumuviri nekukurumidza sei, semuenzaniso nepaganda kana mapapu. Mishonga yezvipembenene inonyungudika mumafuta inowanzo pinda mumasero emuviri zviri nyore.
– Kupararira: Mushure mekupinda, mishonga inouraya zvipembenene inogona kutakurwa neropa kuenda kune dzimwe nhengo dzakadai sechiropa, itsvo, uropi, uye mafuta.
– Metabolism: Chiropa chinoita basa guru mukuputsa mishonga yezvipembenene kuita mhando dziri nyore kuburitsa. Zvisinei, mune dzimwe nguva, metabolism inogadzira metabolites dzine chepfu.
– Kubuda kwechinhu: Kubviswa kwechinhu kuburikidza neweti, tsvina, ziya, kana kufema. Mwero wekubuda kwechinhu unoratidza kana chinhu chichiungana (bioaccumulates) kana kuti chichirasika nekukurumidza.
Pfungwa iyi inokosha nekuti ndiyo inosarudza mhando yemigumisiro yehutano inogona kuitika—yakanyanya, isingarapiki, kana kuti isingaperi.
Mhando dzemigumisiro ine chepfu: acute uye chronic
Chepfu yakanyanya inoitika mukati menguva pfupi mushure mekubatwa zvakanyanya. Zviratidzo zvinogona kusanganisira kuda kurutsa, kurutsa, dzungu, kushaya mweya, kutsamwa kweganda, pfari, uye kunyange kufa. Kazhinji, chepfu yakanyanya inoitika nekuda kwekusanganiswa kwemupimo usina kunaka, kusashandisa zvakanaka michina yekudzivirira (PPE), kana kupfapfaidza munzvimbo dzakamanikana.
Chepfu isingaperi inokonzerwa nekugara uchinwa mushonga kwenguva refu, kunyangwe kana wakaderera. Migumisiro yawo inogona kuoma kuona nekuti zviratidzo zvinokura zvishoma nezvishoma, zvinosanganisira zvirwere zvetsinga, kukanganiswa kwemahormone (endocrine), matambudziko ekubereka, matambudziko echiropa neitsvo, kudzikira kwesimba remuviri rekudzivirira chirwere, uye kunyange kuwedzera njodzi yekenza nemishonga yezvipembenene.
Maitiro ekuita chepfu kwemapoka akati wandei emishonga yezvipembenene
Mishonga yezvipembenene yakasiyana ine nzira dzakasiyana dzechepfu, zvichienderana nekirasi yayo yemakemikari:
1. Organophosphates necarbamates
Boka iri rinozivikanwa nekudzivisa enzyme inonzi acetylcholinesterase. Nekuda kweizvozvo, acetylcholine inoungana uye inokanganisa tsinga dzemuviri. Zviratidzo zvinogona kusanganisira kunyura mate zvakanyanya, kudikitira, miosis (kuoma kwevana), kudedera, kufema kusingafadzi, uye kunyange kukotama.
2. Mapiritsi ePyrethroids
Kazhinji zvinokanganisa nzira dzesodium mumasero etsinga, zvichikonzera zviratidzo zvekukwenya, kutsamwa kweganda, dzungu, uye kana zvanyanya kupararira zvinogona kukanganisa sisitimu yetsinga huru.
3. Mimwe mishonga yekuuraya sora (semuenzaniso paraquat mune dzimwe nyika)
Inozivikanwa kuti ine chepfu yakawanda kana ikamedzwa uye inogona kukonzera kukuvara kwakanyanya kwemapapu. Nekuda kwengozi dzayo, zvimwe zvinhu zvinoshanda zvinorambidzwa kana kurambidzwa zvakanyanya munzvimbo dzakasiyana-siyana.
4. Organic chlorine (semuenzaniso DDT, yakawanda yacho yakarambidzwa)
Inoramba iripo, inogona kuungana muchikamu chezvekudya, uye ine mukana wekuti inokonzera matambudziko ehutano kwenguva refu.
Kunzwisisa nzira idzi kwakakosha pakuongorora chepfu uye kurapwa, kusanganisira kushandisa mishonga yekudzivirira chirwere mune zvimwe zviitiko.
Kuongororwa kwenjodzi nenjodzi: LD50, ADI, uye MRL
Mukurapa zvipembenene, pane zvinhu zvakawanda zvinoshandiswa kakawanda:
– LD50 (Chipimo Chinouraya 50%): Chipimo chinokonzera rufu mu50% yemhuka dzakaedzwa. Izvi zvinotsanangura chepfu yakakomba, asi hazviratidzi nguva dzose njodzi chaiyo iri mumunda.
– ADI (Kudya Kunogamuchirwa Zuva Nezuva): Huwandu hwemishonga inouraya zvipembenene inogona kudyiwa zuva nezuva muhupenyu hwese pasina njodzi huru kuhutano.
– MRL (Muganho Mukuru Wezvisara): Huwandu hwezvisara zvezvipembenene zvinotenderwa muzvinhu zvekudya. MRL dzinosimbiswa zvichibva patsika dzakanaka dzekurima uye kuverenga kuchengetedzeka.
Zvakakosha kusimbisa kuti "njodzi" ne "njodzi" zvakasiyana. Mishonga yekuuraya zvipembenene inogona kuva nengozi huru, asi njodzi inogona kuva shoma kana kubatwa kwayo kukadzorwa nemazvo. Kusiyana neizvi, mishonga yekuuraya zvipembenene ine njodzi dziri pakati nepakati inogona kuva nengozi huru kana ikashandiswa zvisina hanya.
Kukanganiswa kwezvakatipoteredza uye zvisikwa zvisingatarisirwi
Kunze kwevanhu, mishonga yezvipembenene inogona kukanganisa zvipembenene zvisiri zvechivanhu zvakaita senyuchi, hove, shiri, uye tupukanana twemuvhu. Zvisaririra zvemishonga yezvipembenene zvinogona kutakurwa nemvura inoyerera ichipinda munzizi kana kupinda mumvura yepasi pevhu. Munharaunda, mimwe mishonga yezvipembenene inoora nyore nyore, nepo mimwe inoramba iripo uye ichikonzera matambudziko enguva refu akadai sekudzikira kwemarudzi akasiyana-siyana emiti kana kukanganiswa kwezvakatipoteredza.
Rimwe dambudziko nderekusadzivirira zvipembenene, izvo zvinoitika kana kushandiswa kwemishonga inouraya zvipembenene kakawanda kuchiita kuti zvipembenene zvisarambe zvichirwisa zvipembenene. Izvi zvinokurudzira kuwanda kwemishonga kana kushandiswa kwemishonga ine simba, zvichizopedzisira zvawedzera huwandu hwechepfu munzvimbo.
Nzira dzekuderedza njodzi uye dzekudzivirira chepfu
Kuedza kudzora njodzi dzezvipembenene kunofanirwa kuitwa kubva kumusoro kusvika pasi:
1. Nheyo dzekushandisa zvakachengeteka
Verenga zviri papepa, tevedzera chiyero chinokurudzirwa, teerera nguva yekukohwa (nguva isati yasvika yekukohwa), uye usasanganise mishonga yezvipembenene zvisina hanya.
2. PPE uye hutsanana hwebasa
Magirovhosi, chifukidziro chekufema chakakodzera rudzi rwespray, maziso anodzivirira, mbatya dzine maoko marefu, uye kugeza nekuchinja mbatya mushure mebasa. Mbatya dzebasa dzinofanira kugezwa dzakasiyana.
3. Kuchengeta uye kurasa zvinhu
Mishonga yekuuraya zvipembenene inofanira kuchengetwa yakakiyiwa kure nechikafu uye kure nevana. Magaba akashandiswa haafanirwe kushandiswazve uye anofanira kuraswa zvichienderana nemitemo.
4. Kudzidziswa nekutarisira
Varimi nevashandi vanofanirwa kudzidziswa nzira dzekusanganisa, kutungamirirwa nemhepo pavanenge vachipfapfaidza, uye rubatsiro rwekutanga kana painenge yasangana nemhepo.
5. Kutarisirwa Kwezvipembenene Kwakabatana (IPM/IPM)
Kuisa pamberi nzira dzekurima, mhando dzinotsungirira, vavengi vechisikigo, kuchinjanisa zvirimwa, uye kushandiswa kwemishonga inouraya zvipembenene senzira yekupedzisira, IPM inoderedza kuvimba nemakemikari uku ichideredza njodzi dzine chepfu.
Mhedziso
Kurapa chepfu dzezvipembenene zvinouraya zvipembenene mukurima kunopa hurongwa hwesainzi hwekunzwisisa kukanganisa kwemishonga inouraya zvipembenene pahutano nenzvimbo. Nzira dzakasiyana-siyana dzekusangana nayo, nzira dzakasiyana dzechepfu mumapoka emishonga inouraya zvipembenene, uye mukana wemigumisiro yakaipa neyakakomba inoita kuti kushandiswa kwakachengeteka kuve chinhu chinonyanya kukosheswa. Nekushandisa nzira dzakanaka dzekurima, kushandisa michina yekudzivirira munhu (PPE), kutarisira masara nenzira yakakodzera, uye kushandisa Integrated Pest Management (IPM), mabhenefiti emishonga inouraya zvipembenene anogona kuwanikwa ukuwo zvichideredza njodzi dzechepfu nekusvibiswa. Pakupedzisira, kurima kunobudirira kunofanira kufambidzana nekuchengetedza hutano hwevanhu nekuchengetedza nharaunda.
