E ai ki ngā raraunga, ka taea e te pākahiko pātene kotahi te whakapoke i te 600,000 rita wai, ka taea e te tangata te whakamahi mō tōna oranga katoa. Mēnā ka makahia tētahi wāhanga o te pākahiko Nama 1 ki te mara e whakatipuria ana ngā hua, ka noho pakoko te 1 mita tapawha o te whenua e karapoti ana i tēnei pākahiko para. He aha i pēnei ai? Nā te mea he nui ngā konganuku taumaha kei roto i ēnei pākahiko para. Hei tauira: te konutea, te mata, te cadmium, te mercury, me ētahi atu. Ka uru ēnei konganuku taumaha ki roto i te wai, ā, ka mimitihia e ngā ika me ngā hua whenua. Mēnā ka kai te tangata i ēnei ika, ngā kōura me ngā hua whenua kua poke, ka pāngia rātou e te paihana mercury me ngā mate pūnaha io matua, me te reiti mate tae atu ki te 40%. Kua tautuhia te Cadmium hei Carcinogen Akomanga 1A.

Kei roto i ngā pākahiko para ngā konganuku taumaha pērā i te mercury, te cadmium, te manganese, me te mata. Ina waikura te mata o ngā pākahiko nā te hihi o te rā me te ua, ka uru ngā konganuku taumaha ki roto i te oneone me te wai whenua. Mēnā ka kai te tangata i ngā hua i hangaia i runga i te whenua poke, ka inu rānei i te wai poke, ka uru ēnei konganuku taumaha paitini ki te tinana o te tangata, ka putunga mārire, ka waiho hei tūponotanga nui ki te hauora o te tangata.

I muri i te puea ake o te mercury i roto i ngā pākahiko para, ki te uru ki ngā pūtau roro tangata, ka tino pakaru te pūnaha io. Ka taea e te cadmium te kino ki te ate me ngā whatukuhu, ā, i ngā wā tino kino, ka rerekē te āhua o te wheua. Kei roto hoki i ētahi pākahiko para he waikawa me te konganuku taumaha, ka taea te whakapoke i te oneone me te wai ki te turuturu ki te taiao, ā, ka waiho hei tūponotanga mō te tangata.
Tikanga maimoatanga pākahiko

1. Whakarōpūtanga
Pakaruhia te pākahiko para hangarua, tangohia te anga konutea me te rino o raro o te pākahiko, tangohia te taupoki parahi me te tokotoko karāpeti, ā, ko te mea pango e toe ana ko te ranunga o te konupora hauhā me te konupora haukini e whakamahia ana hei matua pākahiko. Kohia motuhaketia ngā matū o runga ake nei, ka tukatukahia kia whiwhi ai i ētahi matū whai hua. Ka horoia te tokotoko karāpeti, ka whakamarokehia, kātahi ka whakamahia hei hiko.

2. Te whakapūtanga konutea
Horoia te anga konutea kua tangohia, ka whakanoho ki roto i te kohua rino. Whakamahanahia kia rewa, kia mahana hoki mō ngā haora e rua. Tangohia te paparanga o runga o te paru, ringihia kia whakamatao, ka maturuturu ki runga i te pereti rino. Kia totoka, ka whiwhi i ngā matūriki konutea.

3. Te hangarua i ngā rau parahi
I muri i te whakahāngai i te taupoki parahi, horoia ki te wai wera, kātahi ka tāpirihia he waikawa whanariki 10% ki te kohua mō te 30 meneti hei tango i te paparanga waikura o te mata. Tangohia, horoia, ka whakamaroke kia whiwhi ai i te rīpene parahi.

4. Te whakaora i te ammonium chloride
Tāpirihia te matū mangu ki roto i tētahi rango, tāpirihia he wai mahana 60°C, ka whakaoho mō te 1 hāora kia memeha katoa te haukinia pūhaumāota ki roto i te wai. Waiho kia tū, tātarihia, ka horoia te toenga tātari kia rua ngā wā, ka kohia te wai matua; i muri i te whakamaroke i te wai matua ki roto i te korehau kia puta rā anō he kiriata tioata mā ki te mata, ka whakamataohia, ka tātarihia kia puta ai he tioata haukinia pūhaumāota, ā, ka hangarua te wai matua.

5. Te whakaora i te hauhā konupora
Horoia te toenga tātari kua tātarihia ki te wai mō ngā wā e toru, tātarihia, maka te keke tātari ki roto i te kohua ka koromamao kia tangohia te waro me ētahi atu mea rauropi, kātahi ka maka ki roto i te wai ka whakaohokia kia tino mātotoru mō te 30 meneti. Tātarihia, whakamarokehia te keke tātari ki te 100-110°C kia puta ai te hauhā konupora pango.

6. Te whakatōtika, te tanumanga hōhonu, me te penapena i roto i ngā maina kua whakarērea
Hei tauira, ka tangohia e tētahi wheketere i Parani te nikara me te cadmium mai i taua mea, ā, ka whakamahia mō te hanga maitai, ko te cadmium ia ka whakamahia anōtia hei hanga pākahiko. Ko te toenga o ngā pākahiko para ka haria ki ngā wāhi tuku para paitini me ngā wāhi tuku para kino, engari ehara i te mea he nui rawa te utu o tēnei mahi, engari he nui anō hoki ngā para, nā te mea he maha tonu ngā rauemi whai hua ka taea te whakamahi hei rauemi mata.