{"id":154935,"date":"2020-09-07T14:41:50","date_gmt":"2020-09-07T14:41:50","guid":{"rendered":"http:\/\/blog.hannaservice.eu\/pravila-titracije-odrzavanje\/"},"modified":"2022-10-07T13:11:57","modified_gmt":"2022-10-07T13:11:57","slug":"pravila-titracije-odrzavanje","status":"publish","type":"post","link":"https:\/\/blog.hannaservice.eu\/hr\/pravila-titracije-odrzavanje\/","title":{"rendered":"Pravila titracije \u2013 odr\u017eavanje"},"content":{"rendered":"\t\t
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Malo pri\u010de o odr\u017eavanju nije na odmet\u2026<\/h2>\n

Iako su Hanna titratori i oprema napravljeni da budu stalno zaposleni, ipak je potrebno ne\u0161to odr\u017eavanja kako bi ostali u najboljem stanju. To ne mora biti preskupo i oduzimti previ\u0161e vremena. Pogledajte ovaj blog gdje \u0107ete na\u0107ii na\u0161e najbolje savjete i pravila za odr\u017eavanje va\u0161e opreme za titraciju.<\/p>\n

Titracija \u2013 odr\u017eavanje<\/h2>\n

#8 Standardizacija titranta<\/h3>\n

\u010citav princip titracije oslanja se na pretpostavku dodavanja titranta poznate koncentracije kako bi se odredila nepoznata koncentracija analita. S vremenom izlaganje okoli\u0161nim parametrima mo\u017ee dovesti do promjene koncentracije titranta. Ako koncentracija titranta varira od one koja je programirana u prora\u010dunu, izra\u010dunati rezultat titracije biti c\u0301e neto\u010dan.<\/p>\n

Redovita standardizacija va\u0161eg titranta je va\u017ena kako bi se osiguralo pravilno izra\u010dunavanje rezultata. Da bi se standardizirao, titrant se titrira prema drugom svje\u017ee pripremljenom standardu poznatog prora\u010duna. Kada se standardiziraju titranti, najbolje je pokrenuti vi\u0161e replika, osiguravajuc\u0301i dobru ponovljivost izme\u0111u replika, i a\u017eurirati jedinicu sa prosjekom rezultata.<\/p>\n

Brzina kojom koncentracija titranta varira u zavisnosti od okoline i uvijeta skladi\u0161tenja, kao \u0161to je relativna vla\u017enost. Dobro pravilo je da standardizirate titrant mjese\u010dno ako boca nije potpuno potro\u0161ena u tom vremenskom okviru. Tijekom du\u017eih perioda izme\u0111u testova, bo\u010dice sa titrantima treba \u010dvrsto zatvoriti i pravilno skladi\u0161titi i re-standardizirati prije upotrebe.<\/p>\n

Ne ustru\u010davajte se kontaktirati nas u vezi vi\u0161e informacija za standardizaciju titranta!<\/p>\n

Kontaktirajte HANNA stru\u010dnjaka za titratore!<\/div>\n

#9 Servis instrumenata<\/h3>\n

Instrumenti i alati za servis i kalibraciju su klju\u010dne komponente za odr\u017eavanje to\u010dnosti cjelokupnog sustava. Vage i pipete se obi\u010dno tvorni\u010dki kalibriraju najmanje jednom godi\u0161nje, ali predla\u017eemo da se obratite dobavlja\u010du ovih alata u vezi sa odre\u0111enim preporukama za u\u010destalost kalibracije. Ovdje c\u0301emo se fokusirati na servis automatskih potenciometrijskih titratora Hanna Instruments.<\/p>\n

Promjena potro\u0161nih dijelova<\/strong><\/h4>\n

Dugotrajno izlaganje titrantima mo\u017ee prouzrokovati propadanje staklene \u0161price unutar birete i cijevi. Razgradnja ovih komponenti mo\u017ee prouzrokovati curenje, \u0161to mo\u017ee biti opasno kako za osoblje, tako i za elektroniku titratora. Tako\u0111er mo\u017ee prouzrokovati ulazak zraka u sustav, o \u010demu smo vec\u0301 razgovarali, a mo\u017ee imati zna\u010dajan utjecaj na rezultate titracije. Ispod su op\u0107e smjernice za zamjenu \u0161prica i cijevi na osnovu vrste i ja\u010dine titranta.<\/p>\n

\"HI931_HI932<\/p>\n\n\n\n\n\n\n\n\n\n
\u0160prica<\/td>\n<\/tr>\n
Titrant<\/strong><\/td>\nU\u010destalost<\/strong><\/td>\n<\/tr>\n
Caustic <1N<\/td>\n1 godina<\/td>\n<\/tr>\n
Caustic >1N<\/td>\n6 mjeseci<\/td>\n<\/tr>\n
Ne-vodene<\/td>\n1 godina<\/td>\n<\/tr>\n
Bilo koji titrant >1N<\/td>\n1 godina<\/td>\n<\/tr>\n
Ve\u0107ina ostalih<\/td>\n2 godine<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\"HI900580-720x720-d537f40c-58f5-4f22-a30a-a2ac28583bbc\"<\/p>\n\n\n\n\n\n\n
Cijev\u010dice<\/td>\n<\/tr>\n
Titrant<\/strong><\/td>\nU\u010destalost<\/strong><\/td>\n<\/tr>\n
Titranti koji kristaliziraju (tj. Srebro nitrat)<\/td>\n3 \u2013 6 mjeseci<\/td>\n<\/tr>\n
Ve\u0107ina ostalih<\/td>\n1 godina<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Kalibracija elektronike<\/h4>\n

S vremenom mo\u017ee do\u0107i do odre\u0111enih odstupanja (driftova) ulaza mV i temperaturne kalibracije potenciometrijskih titratora. Ti ulazi su elektronski signal koji elektroda i temperaturna sonda \u0161alju titratoru za prac\u0301enje reakcije i odre\u0111ivanje krajnje to\u010dke. Kako biste odr\u017eali\u00a0\u00b10,1 mV\u00a0to\u010dnost titratora,, HANNA preporu\u010duje tvorni\u010dku kalibraciju elektronskih komponenti godi\u0161nje.<\/p>\n

Provjera stanja elektrode<\/h4>\n

Uz dosljednu upotrebu, elektrode c\u0301e s vremenom degradirati i morati c\u0301e se zamijeniti. Provjera nagiba je tehnika koja se mo\u017ee koristiti za odre\u0111ivanje stanja elektrode. Odre\u0111eni postupci za provjeru nagiba mogu se nac\u0301i u uputama za elektrode. Za ekvivalentne to\u010dke, nagibi elektroda od 60-120% su obi\u010dno dobri za titraciju. Elektrode izvan ovog opsega nagiba treba zamijeniti. Za odre\u0111ivanje krajnje to\u010dke pH preporu\u010dujemo stro\u017ei opseg nagiba od 85-105%. Op\u0107e preporuke za \u017eivotni vijek elektroda su ispod, ali imajte na umu za zahtjevnija okru\u017eenja, uvijek se savjetuje rezervna elektroda.<\/p>\n\n\n\n\n\n\n\n\n\n\n
Kad treba zamijeniti elektrodu?<\/td>\n<\/tr>\n
Vrsta elektrode<\/strong><\/td>\nU\u010destalost<\/strong><\/td>\n<\/tr>\n
pH<\/td>\n18 \u2013 24 Mjeseci<\/td>\n<\/tr>\n
ORP<\/td>\n3 godine<\/td>\n<\/tr>\n
\u010cvrste ISE<\/td>\n3 godine<\/td>\n<\/tr>\n
Teku\u0107e membrane za ISE<\/td>\nKvartalno<\/td>\n<\/tr>\n
Srebrne Elektrode<\/td>\n3 godine<\/td>\n<\/tr>\n
Fotometrijske elektrode<\/td>\n3 godine<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

 <\/p>\n

#10 Obuka operatora za rad na titratoru<\/h3>\n

Ovaj vodi\u010d pokazuje da postoji puno najboljih praksi koje treba uzeti u obzir prilikom izvo\u0111enja titracija. Ponekad mo\u017ee biti izazov za one koji nemaju znanstveno obrazovanje da sve ovo imaju na umu, pa je obuka od bitnog zna\u010daja za odr\u017eavanje to\u010dnih rezultata.<\/p>\n

Listovi o najboljoj praksi korisni su podsjetnici, ali Hanna preporu\u010duje godi\u0161nje osvje\u017eavanje znanja zaposlenih, kako bi stalno ostali u toku sa novim praksama i bili sigurni da postupke izvode propisano. Vo\u0111enje i odr\u017eavanje dobre evidencije o obuci mo\u017ee govoriti puno tijekom laboratorijske provjere, omogu\u0107avaju\u0107i Vam na taj na\u010din mirno stanje uma.<\/p>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t<\/div>\n\t\t","protected":false},"excerpt":{"rendered":"

Malo pri\u010de o odr\u017eavanju nije na odmet\u2026 Iako su Hanna titratori i oprema napravljeni da […]<\/p>\n","protected":false},"author":14,"featured_media":152860,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[387],"tags":[],"class_list":["post-154935","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-laboratorij"],"yoast_head":"\nPravila titracije \u2013 odr\u017eavanje - 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