Isingeniso

Njengoba ukungcoliswa kwemvelo kuba yinkinga ekhulayo, ukuhlolwa kwekhwalithi yamanzi sekuyingxenye ebalulekile yokuvikelwa kwemvelo, ukuvikelwa kwezempilo yomphakathi kanye nokulawulwa kwezimboni. Kungakhathaliseki ukuthi ukuhlola amanzi aphuzwayo, ukuqapha ukukhishwa kwamanzi angcolile ezimbonini, noma ukuhlolwa kwemvelo kwemifula namachibi, idatha enembile yokuhlaziywa kwekhwalithi yamanzi iyisisekelo sokuthatha izinqumo zesayensi nokulawulwa kokuthobelana.

Njengesinyathelo sokuqala senqubo yokuhlola izinga lamanzi, ukunemba kokuqoqwa kwesampula kuhlobene ngokuqondile nokuthembeka kwayo yonke inqubo yokuhlola.Izitsha zokuhlaziya amanzi ze-EPA, njengeziqukathi zokuphatha amasampula, nakuba zincane ngosayizi futhi zibukeka zilula, ziyisici esibalulekile sokuqinisekisa ukuthi amasampula awangcolisiwe, awasabeli, futhi alondolozwa ngokuzinzile.Uma ukukhetha kungafanele, ngeke nje kuholele ekuhlanekeni kwedatha yokuhlola, futhi kungase kubangele nokusampula okuphindaphindiwe, kubambezele ukuqhubeka komsebenzi futhi kwandise izindleko.

Incazelo kanye Nokuhlelwa Kwezitsha Zokuhlaziya Amanzi E-EPA

Izitsha zokuhlaziya amanzi ze-EPA ziyiziqukathi zesampula ezikhethekile ezihlangabezana namazinga e-EPA okusampula nokuhlaziya futhi asetshenziselwa ngokuyinhloko ukuqoqa nokulondoloza amasampula amanzi ukuze ahlolwe kamuva elabhorethri. Lezi zitsha zenzelwe izinto ezihlukene zokuhlola, izidingo zokulondolozwa, kanye nezici ezibonakalayo ukuze kuncishiswe ukungcoliswa, ukuwohloka, noma izinguquko zokuqamba ngesikhathi sokuthutha nokugcinwa, kanye nokuqinisekisa ukunemba nokukhiqizwa kabusha kwemiphumela yokuhlaziya.

Ngokuya ngezinto ezahlukahlukene nemisebenzi, izitsha zokuhlaziya amanzi ze-EPA zihlukaniswe ikakhulukazi izigaba ezilandelayo:

1. Izitsha zengilazi

• Ivamise ukusetshenziselwa ukuqoqwa kwezinto ezingcolile eziphilayo ngoba ayisebenzi, ayikhangisi kalula izinto eziqondiwe, futhi ingamelana nokuvalwa kwezinga lokushisa okuphezulu. Ivamise ukuhlonywa ngezikulufo ze-screw cap kanye ne-PTFE/silicone gaskets ukuthuthukisa ukuvala nokusimama kwamakhemikhali.

2. Amabhodlela e-polyethylene

• Kubandakanya i-polyethylene ephezulu-density kanye nezinto ze-polyethylene ezinobukhulu obuphansi, ijwayele ukusetshenziselwa ukulinganisa amazinga amahlanu okungcola njengama-ion ensimbi, usawoti wezakhi, ama-anion nama-cations. Lawa mabhodlela awakwazi ukumelana nomthelela futhi alula, awenza afanelekele ukuphatheka esizeni kanye nokusetshenziswa kwevolumu ephezulu.

3. Amabhodlela enhlaka

• Inomsebenzi omuhle we-shading futhi isetshenziselwa ngokukhethekile ukuhlaziywa kwezinto ezizwela ukukhanya, ezingavimbela ngokuphumelelayo ukusabela kwamakhemikhali okubangelwa yi-UV noma ukubola.

4. Amabhodlela ane-Teflon

• Ifanele ukunemba okuphezulu, ukuhlaziya kwezinga lokulandela umkhondo, njengokuqoqwa kwezinsimbi ezisindayo noma amasampuli agqwala kakhulu. I-PTFE inokumelana okuhle kakhulu kwamakhemikhali kanye nokungabi namandla, futhi ngeke isabele cishe nganoma yiziphi izinto, kodwa ibiza kakhulu.

Impahla ngayinye yamabhodlela okuhlaziya amanzi e-EPA inobubanzi bayo obuthile bokusebenzisa, ukukhethwa kufanele kusekelwe esimweni sezinto zokuhlola, izakhiwo ezingokomzimba nezamakhemikhali zalokho okuhlosiwe, kanye nokwelashwa kwangaphambili ukuze kufane nohlobo olufanele lwebhodlela kanye nezimo zokwelashwa kwangaphambili. Uma isiqukathi singakhethwanga ngendlela efanele, singaphazamisa idatha yokuhlolwa, noma kuholele ekumosheni isampula noma kudinge ukuqoqwa kabusha, okuthinta yonke inqubo yephrojekthi.

Izinto Ezibalulekile Ekukhetheni Izitsha Zokuhlaziya Amanzi ze-EPA

Ekuhlolweni kwekhwalithi yamanzi, ukukhetha izitsha ezilungile zokuhlaziya amanzi ze-EPA kubalulekile ekuqinisekiseni imiphumela enembile.

1. Uhlobo lwento yokuhlola

Izinto ezihlukile zokuhlola zihambisana nezidingo ezihlukile zamasampula, ngakho-ke isinyathelo sokuqala sokukhetha izitsha zokuhlaziya amanzi ze-EPA ukuchaza izinto zokuhlola:

• Ukutholwa kokungcola kwe-organic: njengezinhlanganisela eziphilayo eziguquguqukayo, izinhlanganisela eziphilayo eziguquguqukayo, njll., kufanele kusetshenziswe amabhodlela engilazi. Izinto zengilazi zivimbela ngempumelelo ukukhangiswa kanye nokushintshashintsha kwezinto eziphilayo, futhi kuvame ukudingekile ukufaka kusengaphambili i-asidi ukuze kuvinjwe umsebenzi we-microbial futhi uvimbele ukuwohloka kokuhlosiwe.
• Ukutholwa kwensimbi enzima: okufana nomthofu, i-mercury, i-cadmium nezinye izakhi zensimbi zokulandelela, kufanele kusetshenziswe amabhodlela e-polyethylene aphezulu kakhulu, ngenxa yokungaphazanyiswa kwayo kwangemuva kwensimbi, akulula ukukhangisa ama-ion ensimbi, futhi inokuqina okuhle kwamakhemikhali.
• Ukuhlolwa kwe-Microbiological: njengamabhaktheriya e-coliform, inani eliphelele lekholoni, njll., kudingeka kusetshenziswe amabhodlela epulasitiki angenalutho, alahlwayo, ngokuvamile i-PET noma i-polypropylene, ukuze kuqinisekiswe ukuthi amasampula awangcoli ngaphambi kokuthutha.

2. Ukukhetha izinto ezibonakalayo

Izimfanelo zezinto ezihlukene zinezici zazo futhi zithinta idatha yokuhlola ngokuhlukile:

• Amabhodlela engilazi: ukumelana nokushisa okuphezulu, okungenayo amakhemikhali, akulula ukusabela ngezinto eziphilayo, ezivumelaniswe nokuhlaziywa kwezinto eziphilayo. Kodwa-ke, isisindo sikhulu, kulula ukuphuka, ukuthutha kudinga ukuqaphela.
• Amabhodlela epulasitiki (i-polyethylene, i-polypropylene, njll.): ilula, akulula ukuphuka, ifanele ukuhlaziya okuningi kwe-inorganic. Kodwa-ke, amanye amapulasitiki angakhanga ukungcola kwezinto eziphilayo noma akhulule ukungcola kwangemuva, okungafanele ukulandelela ukuhlaziywa kwezinto eziphilayo.

3. Ukuthi ukucubungula kwangaphambili kuyadingeka

Izitsha zokuhlaziya amanzi ze-EPA ngokuvamile zidinga ukugcwaliswa kusengaphambili ngezilondolozi noma imithi yokwelapha ukuze kugcinwe ukuqina kwesampula:

• Izilondolozi ezijwayelekile zifaka i-HCI, i-HNO₃, ne-NaOH.
• Ukwelashwa kwangaphambili esizeni: kunganciphisa izinguquko, kodwa kudinga ukusebenza okujwayelekile kanye nezimo ezithile zesayithi.
• Ukwelashwa kwangaphambili kwelabhorethri: ukusebenza okunembe kakhudlwana, kodwa kudinga izimo zokugcinwa kwesampula ephakeme futhi kungase kwethule izinguquko ngesikhathi sokuthutha.

4. Umbala webhodlela

• Ibhodlela elinsundu: Isetshenziselwa amasampula ezinto ezizwela ukukhanya, njengezibulala-zinambuzane, ukungcola kwezinto eziphilayo, njll. Ingavimba ngokuphumelelayo imisebe ye-ultraviolet futhi ibambezele ukonakaliswa kwesampula.
• Ibhodlela esobala: ifanele amaphrojekthi angezwani nokukhanya, kulula ukuyibona umbala wamasampuli amanzi, i-turbidity nezinye izakhiwo ezibonakalayo, kodwa ayinconyelwe ukutholwa kwezinhlanganisela zezithombe.

5. Ukukhetha ivolumu

• Kufanele kusekelwe endleleni yokuhlola. Izidingo zaselabhorethri nohlelo lwephrojekthi lokukhetha umthamo webhodlela. Ukucaciswa okujwayelekile ngu-40ml, 125ml, 500ml, njll.
• Amanye amaphrojekthi adinga ukuthi kushiywe inani elithile "lendawo yekhanda lomoya" ukuze kwengezwe ama-reagents noma ukuvimbela ukuqhwa nokwanda; kuyilapho amanye amaphrojekthi adinga ukuthi kungabikho sikhala esishiywe futhi ibhodlela ligcwaliswe umthamo.

Amazinga e-EPA kanye Nezidingo Zokulawula

Ekuhlolweni kwekhwalithi yamanzi, iziqukathi zesampula aziyona nje ingxenye yokusebenza kokuhlolwa, kodwa futhi ziyingxenye ebalulekile yokulawulwa okuqinile kwemikhuba yokulawula, i-EPA (US Environmental Protection Agency) ngezindlela eziningi zokuhlola ezitsheni zokuhlaziya amanzi ukwenza izinhlinzeko ezicacile zohlobo lokuhlaziywa kwamanzi, izinto zokwakha, nokuphatha ukuze kuqinisekiswe ukuthi idatha yokuhlaziya yesayensi, ukunemba nokuhambisana nomthetho.

1. Izindinganiso ezivamile zokuqapha izinga lamanzi ze-EPA kanye nezidingo zamabhodlela amasampula

Ngezansi kunezindlela ezimbalwa zokuhlola ze-EPA ezimele kanye nezidingo zazo eziqondile zamabhodlela amasampula:

• I-EPA 524.2 (ukuhlolwa kwe-VOC): kudinga ukusetshenziswa kwamabhodlela engilazi angenalutho angu-40 ml angenalutho ane-PTFE/silicone sealing gaskets, ane-hydrochloric acid engezwe ebhodleleni njengesivikelo. Ibhodlela lidinga ukugcwaliswa phezulu ngaphandle kwamabhamuza omoya noma i-voids ukuvimbela ama-VOC ukuthi angaphunyuki.
• I-EPA 200.8 (Ukutholwa kwe-ICP-MS kwezinto zensimbi): Ukusetshenziswa okunconyiwe kwamabhodlela epulasitiki e-HDPE, amabhodlela adinga ukungezwa ku-asidi ye-nitric pre-acidification ukuvimbela ukukhangisa kwemvula yensimbi.
• Uchungechunge lwe-EPA 300 (ukuhlaziywa kwe-ion chromatography yama-anions nama-cations): amabhodlela e-polypropylene noma i-polyethylene angasetshenziswa ngaphandle kokungeza i-asidi, amabhodlela adingeka ukuthi ahlanzeke futhi angabi nama-ion aphazamisayo afanele.
• Uchungechunge lwe-EPA 1600 (ukuhlolwa kwe-microbiological): idinga amabhodlela epulasitiki angenalutho, alahlwayo, ngokuvamile asetshenziselwa ama-coliforms aphelele, i-enterococci nezinye izinkomba, ibhodlela lingangezwa enanini elifanele le-sodium thiosulfate ukuze kuncishiswe izinsalela ze-chlorine.

Izinga ngalinye linemithetho eqinile yohlobo lwebhodlela, ivolumu, izinga lokushisa eligcinwayo nesikhathi sokuligcina, futhi ukuziba noma iyiphi yale mininingwane kungase kubangele idatha engavumelekile.

2. Izidingo zohlelo lokugunyazwa kwelabhorethri zokuthatha amasampula eziqukathi

Empeleni, amalabhorethri amaningi ezinkampani zangaphandle adinga ukugunyazwa okukhethekile, okufana nalokhu:

• I-NELAC (Inkomfa Kazwelonke Yokugunyazwa Kwelabhorethri Yezemvelo): idinga ngokucacile ukuthi iziqukathi zamasampuli, izinqubo zokusampula, nezindlela zokulondoloza zithobelane ne-EPA noma izindinganiso zikazwelonke, nokuthi uchungechunge oluphelele lwamasampuli lubhalwe phansi.
• I-ISO/IEC 17025 (Izimfuneko Ezijwayelekile Zekhono Lokuhlola Nokulinganisa Kwamalabhorethri): igcizelela ukulandeleka, ukuphathwa okujwayelekile kwezinsiza zesampula namarekhodi okusetshenziswa kwazo, kanye nokusungulwa kwama-SOP (Izinqubo Ezijwayelekile Zokusebenza) zokukhethwa kweziqukathi, ukuhlanzwa nokugcinwa.

Amalabhorethri aphumelele lokhu kugunyazwa kudingeka abe nohlelo oluqinile lokuphatha ukuqoqwa kwesampula, futhi ukukhethwa nokusetshenziswa kwamabhodlela amasampula kufanele kubhalwe phansi ukuze kucwaningwe kwangaphakathi noma kwangaphandle.

3. Imithelela esebenzayo yemisebenzi yokuthobela imithetho

Ukukhetha i-EPA ejwayelekile yokuhlaziywa kwamanzi izitsha zeqhwa ngokuhambisana ngokuqinile nemithethonqubo akukhona nje ukuhlangabezana nezidingo zaselabhorethri noma zohlelo, kodwa futhi kuhlobene ngokuqondile nalokhu okulandelayo:

• Qinisekisa ukufaneleka kwesayensi nomthetho kwedatha yokuhlola: izindlela zokusampula ezithobela umthetho nezindlela zokulondoloza ziyisisekelo sokuqapha idatha ezoqashelwa iminyango kahulumeni, izinkantolo noma umphakathi.
• Ukudlulisa ukubuyekezwa kwephrojekthi kanye nokuhlolwa kwekhwalithi: Ikakhulukazi ezinqubweni zokuhlola umthelela kwezemvelo, izimvume zokukhishwa kwezinto, ukwamukelwa kwemvelo, njll., ukusetshenziswa okujwayelekile kwamabhodlela amasampula kungagwema ukubuyiselwa noma ukuhlolwa kabusha ngenxa yokungathobeli imithetho.
• Gwema udoti wesampula kanye nengozi yokuqoqwa kabusha: Uma isampula kutholakala ukuthi ayivumelekile, idinga ukuqoqwa kabusha, okungagcini nje ukubambezela ukuqhubeka, kodwa futhi kwandisa izindleko zomsebenzi, izinto zokwakha nezokuthutha.

Izinyathelo Zokuqapha Ekusebenzeni Kwedizayini

Ngisho noma izitsha zokuhlaziya amanzi ze-EPA zikhethiwe ezihlangabezana nezindinganiso ze-EPA, ukuphatha okungafanele ngesikhathi sokusampula, ukugcinwa, nokuthutha kusengaholela ekungcolisweni kwesampula, ukonakala, noma ukungasebenzi kwedatha. Ngakho-ke, kubalulekile ukunakisisa yonke imininingwane ukuze uqinisekise ubuqotho besampula kanye nokufaneleka kwemiphumela yokuhlolwa.

1. Ukuhlola uphawu lwe-cap

Ukuvalwa kwezitsha zokuhlaziya amanzi ze-EPA kuhlobene ngokuqondile nokuthi isampula izoshintshashintsha, ivuze, noma isabele ngokumunca umswakama ngesikhathi seshalofu:

• Ngaphambi kokuthatha isampula, ikepisi kufanele libhekwe ukuze kubonakale ukuthi ikepisi lilingana kahle yini nomlomo webhodlela, futhi uma kukhona ukubola, ukuphuka noma ukuguga.
• Ukuze kutholwe izinhlanganisela eziphilayo eziguquguqukayo nezinye izinto ezizwela kakhulu, kubaluleke kakhulu ukusebenzisa ikepisi yokuvala enentambo nge-PTFE/silicone gasket, uyiqinise bese uholela eshekeni ukuze uqinisekise ukuthi akukho ukuvuza.
• Ikepisi kufanele liqiniswe ngokushesha ngemva kokuqedwa kwesampula ukugwema ukuchayeka isikhathi eside.

2. Izindlela zokugwema ukungcoliswa ngokwehlukana

Noma yimuphi umsebenzi ongahlanzekile unamandla okwethula iziphazamiso zasemuva ezingathinta ileveli yangemuva yesampula, ikakhulukazi ekuhlaziyweni kokulandelela noma ukutholwa kwe-microbial:

• Sebenzisa amagilavu ​​alahlwayo eqoqweni ngalinye lesampula bese ushintsha ibhodlela ngaphambi kokudlala ukuze uvimbele ukungcoliseka.
• Sebenzisa amathuluzi okusampula akhethekile (isb., izinduku zokusampula, amaphampu amasampula, njll.) futhi uwahlanze noma uwashintshe kahle phakathi kwezindawo zamasampula.
• Kumasampuli adinga ukwelashwa kusengaphambili esizeni, sebenzisa ama-pipette ahlanzekile noma izitsha ezigcwaliswe ngaphambili ngezivimbelakuvunda ukuze ugweme ukuchayeka isikhathi eside emoyeni.

3. Izimfuneko zokulondolozwa kwesampula nezokuthutha

Amasampula amanzi angase ashintshe, awonakaliswe noma ehluleke uma engagcinwanga noma athuthwe ngendlela efanele phakathi nenkathi kusukela ngesikhathi sokuqoqwa kuya esikhathini sokuhlolwa kokuhlolwa:

• Izinga lokushisa lokulondoloza: izitsha eziningi zokuhlaziya amanzi ze-EPA zidinga ukugcinwa ngaphansi kwezimo zesiqandisi ku-4℃, futhi ngokuvamile zithuthwa ebhokisini lesiqandisi noma iphakethe leqhwa; amasampula e-microbiological kufanele alawulwe ngokuqinile futhi ahlaziywe phakathi namahora ayi-6.
• Isikhathi sokulondoloza: Izinto ezihlukene zinezikhathi ezihlukene zokulondolozwa, isb izinsuku eziyi-14 zama-VOC, amahora angama-48 osawoti wezakhi, kanye nezinyanga ezifika kweziyisi-6 zezinsimbi ezisindayo (ngaphansi kwezimo zokungeniswa kwe-asidi ngaphambi kwesikhathi).
• Ukulebula Kwesitsha: Ibhodlela ngalinye lesampula kufanele lifakwe ilebula yenombolo yokufuduka ebonisa isikhathi nendawo yesampula, igama lento, kanye nendlela yokulondoloza ukugwema ukudideka kwesampula.
• Amarekhodi ezokuthutha: Kunconywa ukusebenzisa isampula kanye neshidi lokuthathwa ukuze urekhode yonke inqubo yesampula kusukela ekuqoqweni kuya elabhorethri ukuze kuhlangatshezwane nezidingo zokulawulwa kwekhwalithi nokuhlolwa kwamabhuku.

Izibonelo Zemiqondo Eyiphutha Evamile Namaphutha

Emsebenzini wangempela wokuqapha izinga lamanzi, ngenxa yokuntula ulwazi ngokusetshenziswa kwezicaciso zamabhodlela amasampula, kuvame ukuba nomthelela obonakala umncane kodwa ongathi sína emiphumeleni yephutha lokusebenza. Okulandelayo kubala ukungaqondi kahle okumbalwa okujwayelekile kanye nemiphumela ebangelwa yikho, ukuze kusetshenziswe ireferensi nesixwayiso.

1. Ukungcoliswa kwesampula noma i-adsorption ngenxa yokusetshenziswa kwezinto ezingalungile

• Uma amabhodlela epulasitiki ajwayelekile asetshenziswa ukuqoqa amasampula e-VOC, amabhodlela epulasitiki (ikakhulukazi i-PVC noma i-polyethylene yekhwalithi ephansi) athambekele ekukhangisweni noma ekungeneni kwezinto ezingcolisa izinto eziphilayo, okuholela ekwehleni kokugxilisa ingqondo kanye nevelu yokutholwa ephansi noma engabonakali. Amabhodlela engilazi alawulwa yi-EPA anamakhanda angenawo umoya kufanele asetshenziswe, nama-PTFE/silicone gaskets ku-cap liner ukuze kuqinisekiswe ukungabi namakhemikhali nokuvala uphawu.

2. Ukunganaki imiphumela ye-photosensitivity kuholela ekonakaleni kwesampula

• Uma amabhodlela engilazi akhanya esetshenziswa ukuqoqa amasampula ezinsalela zezibulala-zinambuzane futhi echayeka elangeni isikhathi eside ngemva kokusampula, izinto ezithile eziphilayo ezifana nezibulala-zinambuzane, ama-PAH, nezinto ze-nitroaromatic zizwela kakhulu ekukhanyeni, futhi zingabola futhi ziguquke ngaphansi kokukhanya, okuholela emiphumeleni ehlanekezelwe. Ezintweni ezizwela ukukhanya, amabhodlela ansundu kufanele asetshenziselwe ukuthatha amasampula, futhi amasampula kufanele agcinwe ngokushesha futhi avikelwe ekukhanyeni ngemva kokusampula, futhi ukukhanya kwelanga okuqondile kufanele futhi kugwenywe ngesikhathi sokuthutha.

3. Awekho ama-preservatives noma izimo ezingafanele zokugcina, ukuwohloka kwesampula

• Uma amasampula e-ammonia nitrogen aqoqwe ngaphandle kwezivimbelakuvunda futhi afakwa efrijini amahora angama-24 ngaphambi kokuba athunyelwe ukuyohlolwa. Emazingeni okushisa asekamelweni, ama-microorganisms azogaya ngokushesha i-ammonia nitrogen emanzini noma ayiguqule ibe ezinye izinhlobo, okuholela ekushintsheni kokugxilwa kwe-ammonia nitrogen futhi yenze imiphumela yokuhlolwa ingasebenzi. Amasampula kufanele afakwe i-asidi ngokungeza i-sulfuric acid noma i-hydrochloric acid ngokushesha ngemva kokuqoqwa ukuze avimbele ukusebenza kwamagciwane futhi athuthwe ngaphansi kwezimo zesiqandisi ku-4°C ukuze kuqinisekiswe ukuthi athunyelwa ukuze ahlolwe phakathi nesikhathi esibekiwe.

Le mibono eyiphutha evamile isikhumbuza ukuthi ukukhetha izitsha ezilungile zokuhlaziya amanzi e-EPA kuyisinyathelo sokuqala kuphela, futhi okubaluleke nakakhulu, ukusebenza okujwayelekile kwayo yonke inqubo kanye nemininingwane yokulawula, ukuze kuqinisekiswe ukuthi idatha yokuhlola izinga lamanzi iyiqiniso futhi inokwethenjelwa, ngokusemthethweni kwezomthetho nezobuchwepheshe.

Isiphetho

Ekuqaphelweni kwekhwalithi yamanzi, izitsha zokuhlaziya amanzi ze-EPA, nakuba ziyisitsha esincane kuphela, zidlala indima ebalulekile kuyo yonke inqubo yokusampula nokuhlaziya. Ukukhetha izitsha zokuhlaziya amanzi ze-EPA kubalulekile ukuze kuqinisekiswe ukunemba kwedatha, ukulandeleka nokuhambisana nokulawula.

Kuphela ngesisekelo sokukhethwa okunengqondo kwamabhodlela amasampula, kuhlanganiswe nezinqubo ezijwayelekile zokusebenza (njengokusebenzisa izigcina-gazi, ukugcinwa kude nokukhanya, ezokuthutha eziqandisiwe, njll.), kunganciphisa izinguquko ekuqoqweni, ekugcinweni nasekuthuthweni kwamasampula, ukuze kuqinisekiswe ukuthi imiphumela yokuhlolwa yokugcina iyiqiniso, ithembekile futhi isemthethweni.

Ngaphezu kwalokho, kunconywa ukuthi iyunithi ngayinye ihlele njalo ukuqeqeshwa kwamehlo kwabasampula ukuze kuthuthukiswe ukuqonda nokusebenzisa izindinganiso ze-EPA kanye nokucaciswa kwesampula yokusetshenziswa kwamabhodlela, ukuze kugwenywe izinkinga ezifana nokumbiwa kabusha kwezimayini, ukuchithwa kwedatha noma ukwehluleka kocwaningo lwamabhuku ngenxa yamaphutha okusebenza, ngaleyo ndlela kuthuthukiswe ngokugcwele ubungcweti nekhwalithi yomsebenzi wokuqapha izinga lamanzi.