He kaiārahi whakarewa te waikawa Ethylenediaminetetraacetic (EDTA). Ko te tikanga o te chelating ka taea e ia te hono atu ki ētahi katote whakarewa, ā, ka kore e mahi ngā katote whakarewa kua herea.

Mā te whakamahi i tēnei āhuatanga o te EDTA, e rua ngā momo whakamahinga i roto i ngā whakamātautau;

Ko tētahi momo ko te tono whakamuri, e aukati ana i ētahi tauhohenga mā te whakararuraru i te here o ngā katote konganuku.

Tangohia he katote: I roto i ētahi tauhohenga, he mea nui te here o ngā katote konganuku. Ka whakakotahihia e mātou te EDTA me ēnei katote konganuku hei aukati i tēnei tauhohenga.

Hei tauira, me whai wāhi mai ngā iona konupūmā ki te toto totoka. Ka tāpirihia e mātou te EDTA ki te toto hei whakapūmau i ngā iona konupūmā ki te EDTA, ā, ka ārai i te toto totoka. Koinei te mātāpono o te EDTA anticoagulation;

Hei tauira anō, ko te whakarite i te otinga tango i te konupūmā i roto i te tae mate ka whakamahi anō i te pānga chelation o te EDTA. E mōhio ana tātou mēnā kāore e tangohia te konupūmā o te kiko konupūmā-nui, ka uaua ki te tapahi kia tino kiko i te wā e tapatapahia ana, nō reira me tango te konupūmā i mua i te tapatapahi.

Tērā anō tētahi momo tono whakamua e whakatairanga ana i ētahi tauhohenga mā te whakararuraru i te herea o ngā katote konganuku.

Hei tauira, tāpirihia te EDTA ki te otinga nakunaku trypsin. Ki te kore e tāpirihia te EDTA, ka herea te trypsin ki te konupūmā me te konupora i runga i te mata o te pūtau, i roto rānei i te ipu ahurea, ā, ka ārai i te mahi a te trypsin.

I tēnei wā, tāpirihia he iti o te EDTA kia taea ai e te EDTA te hono atu ki aua konupūmā kore utu, te konupora me ētahi atu iona takirua. I tēnei wā, ka hangaia he āhua pai mō te putanga mai o te trypsin.

Ko te mea tino whakamiharo mō te EDTA ko tōna wairewatanga. He paku wairewa ki te wai, ā, he mā te āhua i roto i te wai. I tēnei wā, tāpirihia te konutai hauwai hei whakatika i tōna pH. I te piki haere o te pH, ka mārama haere te otinga. Ina tata te pH ki te 8, ka tino mārama. Kāore e wehi i te waikawa engari i te kawakore.

He maha ngā whakamahinga whakamiharo o te EDTA. Ka kitea te tino makutu o ngā matū o te taiao, engari kāore anō kia kitea e tātou.

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