Te kahurangi metilīni i ngā whakamātautau tātari me te rangahau taiao

Ka kitea te kahurangi metilīni i roto i ngā tikanga taiwhanga maha, engari he rerekē tana mahi i tēnā, i tēnā. I tētahi whakamātautau wai, ka tāpirihia te waikano e te taiwhanga hei kite i ngā matū whakahohe-mata. I tētahi atu, ka whakaputaina te waikano e te tauhohenga mai i te sulfide. I tētahi whakamātau whakapiri ā-mata, ka inea e te taiwhanga te nui o te waikano tāpiri ka wehe atu i te wairewa.

Ka taea ēnei tikanga katoa te mutu ki tētahi wē kahurangi me tētahi pānuitanga ine tūāwhiorangi. Kāore e taea te whakawhitiwhiti noa i ō rātou hua. I mua i te kōwhiri tikanga, tautuhia te tauira, te āhuatanga e inea ana, me te wāhi o te kahurangi metilīni ki te whakaputa i te tohu.

Kimihia te tikanga e whakautu ana i tō pātai

Ka wehewehea e te rārangi e whai ake nei ngā whakamahinga tātari me ngā whakamahinga taiao matua. Ko te “Āhuatanga kua inea” e whakaahua ana i te hua ka taea te tautoko e te whakamātau, mēnā e whai mana ana ōna whakahaere whakamātau me tana whakatika ine.

He rerekē ngā whakatika ine e hiahiatia ana mō te tauhohe me te hua tauhohenga

I te whakamātautau MBAS, ka tauhohe te kahurangi metilīni ki ngā matū whakahohe-mata katote-tōraro hei hanga momo matū ka tangohia ki roto i te chloroform. Ka whakaahua te whakarāpopototanga o te Tikanga EPA 425.1 i NEMI i te ine i te tae o taua tangohanga. E pā ana te hua tātari ki ngā matū e urupare ana ki tēnei tukanga, ehara i te rārangi katoa o ngā hopiwē kei roto i te wai.

Ka hurihia te mahi a te waikano i te tikanga sulfide. I te Tikanga EPA 376.2, ka tauhohe te sulfide ki te dimethyl-p-phenylenediamine i te aroaro o te ferric chloride hei whakaputa kahurangi metilīni. Ka kapi i te tikanga ngā taiao matū wai, para hoki kua tohua, ā, kāore e kapi ngā sulfide kāore e memeha i te waikawa. Ka whakatūpato hoki ka tangohia pea te sulfide mā te whakauru hau, ka whakaurua rānei he hāora e huri ai hei momo kāore e taea te ine.

Ka pā tēnei rerekētanga ki te whakatika ine. Me whakakanohi ngā paerewa i te matū e tātarihia ana, ā, me whai i ngā tauhohenga matū e hāngai ana. Kāore tētahi pounamu wairewa kahurangi e noho noa hei whakakapinga tika mō tētahi paerewa sulfide, paerewa matū whakahohe-mata rānei. He wāhanga hoki te whakahaere i te tauira o te inenga: kāore e taea e tētahi taputapu tino pū te whakahoki mai i te matū tātari kua ngaro i mua i te tātaritanga.

Ka ine ngā whakamātautau rauemi i te whanonga i raro i ngā herenga kua kōwhiria

I te nuinga o te wā, ka tīmata tētahi whakamātau whakapiri ā-mata ki te kukūtanga waikano e mōhiotia ana me te nui o te totoka e mōhiotia ana. Whai muri i te whakapā, ka wehe te taiwhanga i te totoka, ka ine hoki i te waikano e toe ana i te wē. Mā te rerekētanga o te kukūtanga, te rōrahi o te wairewa, me te papatipu o te totoka e whakaatu te nui e āhua mau ana mō ia waeine papatipu, mēnā he tika te kaute papatipu.

I kitea e tētahi rangahau whakataurite mō te whakapiri ā-mata o te kahurangi metilīni ki ētahi momo waro ka whakawhirinaki te tangohanga ki te kukūtanga tuatahi, te rahi matūriki, te wā whakapā, te nui o te rauemi whakapiri ā-mata, me te pH. Nā ēnei hononga e mārama ai te take kāore tētahi ōrau tangohanga nui e ranea hei whakaraupapa i ngā rauemi. Tērā pea he nui noa atu te waro i whakamahia e tētahi whakamātau. Whakamahia te aratohu mō te whakataurite i te kaha pupuri me te tere whakapiri ā-mata hei tirotiro mēnā i whakamātauria e ngā rangahau ngā herenga ka taea te whakataurite.

Ka whakamahi te whakamātautau whakahiato i te whakapiri ā-mata mō tētahi whāinga kē. Ka pūrongo a ASTM C1777-20, e whakarārangitia ana e ASTM hei paerewa hohe, i te nui o te waikano kua mau mō ia karamu whakahiato moroiti, whakakī kohuke rānei. Ka whakaata te uara i te nui me ngā āhuatanga o ngā kohuke uku kei roto i te tauira.

Ka whakatūpato mārika te paerewa ka tino rerekē pea ngā hua o C1777, AASHTO T 330, me EN 933-9 ahakoa he ōrite ō rātou waeine. Ko tētahi take ko ngā wāhanga rahi matūriki rerekē e whakamātauria ana. Kāore e taea te whakawhiti noa i tētahi paenga tau mai i tētahi tikanga ki tētahi atu.

Me nui ake i te memeha noa o te tae kahurangi ngā taunakitanga rangahau taiao

He whaihua te kahurangi metilīni hei pūhui whakatauira nā te mea he ngāwari te whai i tōna tohu whatu. Heoi, he maha ngā tukanga ka taea te whakaiti i taua tohu. Ka neke pea te waikano ki te mata o tētahi totoka, ka huri hei momo matū kē, ka kaha ake rānei tōna whatiwhatinga.

I tirotiro tētahi rangahau tōmua mō te ara whatiwhatinga mā te whakakōkī ā-mārama i te kahurangi metilīni i roto i ngā wē whai matūriki titanium dioxide iri i raro i te aho hihi-katikati. I aromatawai ngā kairangahau i ngā hua takawaenga me te huringa hei matū pararopi-kore, i te taha o te tangohanga tae. He mea nui taua huinga inenga whānui ake: he pito whakamutunga rerekē te ngaronga o te tae ka kitea me te huringa o te waro pararopi hei hua pararopi-kore.

Hei tauira, ki te koma haere tētahi wē whai whakakōkī iri, me pātai tuatahi mēnā kua kohia te waikano ki runga i te whakakōkī. Ka āwhina tētahi whakamātau whakahaere whakapā i te pōuri ki te tirotiro i te whakapiri ā-mata; ka āwhina te whakamarama me te kore whakakōkī ki te tirotiro i ngā panonitanga nā te mārama anake. Hei taunaki i te huringa hei matū pararopi-kore, me whai inenga waro tika me te kaute i ngā wāhanga ā-tūāhua i tangohia ai ngā tauira. He pātai ēnei mō te hoahoa whakamātau, ehara i ngā whakatau ka taea mai i tētahi whakaahua.

Waihoki, kāore te mahi i roto i tētahi wairewa waikano kua whakaritea e whakaū i te mahi i roto i tētahi rerenga para ahumahi kei roto nei ngā tote, ngā matūriki iri, me ngā pūhui whakataetae. Ka wehe te aratohu mō te haerenga o te matū i te taiao me ngā taunakitanga wai para i ngā whakamātau whakatauira me ngā pātai pānga taiao. Ka whakarato ngā whakamahinga waikano ki te papanga me te pepa i te horopaki ahumahi e hāngai ana.

Ka whakawhirinaki ētahi atu whakamahinga ki te pūnaha whakamātautau katoa

I tētahi pūoko aptamer matūhiko, ka here tētahi rāpoi mōhio ki te matū whāinga, ā, ka āwhina tētahi pūtohu kahurangi metilīni kua whakapiria ki te huri i taua pāhekoheko hei tohu hiko. I whakaatu tētahi rangahau 2026 mō te whanonga pūoko i roto i te wē toto me pēhea ngā pūmua me ētahi atu wāhanga o te tauira e whakarerekē ai i te mahi ina whakatauritea ki te wairewa pūreirei. Ko te take mahi ko te whakamana i te taiao matū o te tauira: kāore te whakatika ine i roto i tētahi wairewa māmā e whakaū i ngā inenga pono i roto i tētahi tauira matatini.

Mō te takai, ka pātai te whakamātautau urunga waikano mēnā ka uru tētahi pūtohu whai ka kitea mā tētahi wāhi pakaru i roto i tētahi whakamātautau wero kua tautuhia. Kei roto i te aratohu FDA mō te whakamātautau tōtikatanga o te ipu me tōna katinga ngā tikanga urunga waikano kua whakamanahia tikatia, hei momo whakamātautau tōtikatanga ka taea. Ka wehewehe hoki taua aratohu i tō rātou whakamahinga i ngā hōtaka pūmautanga me te whakamātautau noho iroriki-kore i mua i te tuku hua. Ki te puta he hua waikano tōraro, ko te tikanga kāore he urunga i kitea e taua whakamātautau, ehara i te mea kua whakakorea ngā ara whakaparu katoa ka taea.

Mō te tātaitanga, ka tautuhi te whakatakotoranga tohu Tashiro a ITW Reagents i tētahi ranunga whero metili me te kahurangi metilīni mō ngā tātaitanga haukini. Nō taua ranunga te whakawhitinga tae kua tuhia. Ki te whakakapihia ki te kahurangi metilīni anake, ka panoni te pūnaha tohu.

Tautuhia te hua i mua i te whakarite i te waikano

Tuhia te taiao matū o te tauira, te āhuatanga whāinga, ngā waeine, te tikanga e hāngai ana, me te whakatau ka tautokona e te hua. Kātahi ka kōwhiri i te ranunga tauhohe, te whakatika ine, ngā whakahaere whakamātau, me ngā herenga whakahaere e pupuri ai i te tika o taua inenga.

Mō ngā mahi whatu, whakamahia te aratohu mō te hanga ānau whakatika ine kahurangi metilīni hei tirotiro i ngā tauira pātea, te awhe kukūtanga, me te rārangitanga. Ka kī tētahi pūrongo whaihua he aha i panoni, i pēhea te ine, ā, ko tēhea whakamāoritanga e tautokona ana e te whakamātau. Kāore te ingoa o te waikano e whakarato i aua taipitopito.