{"id":154634,"date":"2020-09-07T14:41:50","date_gmt":"2020-09-07T14:41:50","guid":{"rendered":"https:\/\/blog.hannaservice.eu\/pravila-titracije-odrzavanje\/"},"modified":"2022-10-10T08:51:00","modified_gmt":"2022-10-10T08:51:00","slug":"pravila-titracije-odrzavanje","status":"publish","type":"post","link":"https:\/\/blog.hannaservice.eu\/sr\/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 uposleni, ipak ne\u0161to odr\u017eavanja je potrebno kako bi ostali u najboljem stanju. To ne mora da bude preskupo i da uzima previ\u0161e vremena. Pogledajte ovaj blog da biste pro\u010ditali na\u0161e najbolje savete i pravila za odr\u017eavanje va\u0161e opreme za titraciju.<\/p>\n

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

#8 Standardizovanje titranta<\/h3>\n

\u010citav princip titracije oslanja se na pretpostavku dodavanja titranta poznate koncentracije da bi se odredila nepoznata koncentracija analita. Vremenom izlo\u017eenost \u017eivotnoj sredini mo\u017ee dovesti do promene koncentracije titranta. Ako koncentracija titranta varira od one koja je programirana u prora\u010dunu, izra\u010dunati rezultat titracije bic\u0301e neta\u010dan.<\/p>\n

Redovna standardizacija va\u0161eg titranta je va\u017ena kako bi se osiguralo pravilno izra\u010dunavanje rezultata. Da bi se standardizovao, titrant se titruje prema drugom sve\u017ee pripremljenom standardu poznatog prora\u010duna. Kada se standardizuju titranti, najbolje je pokrenuti vi\u0161e replika, osiguravajuc\u0301i dobru ponovljivost izme\u0111u replikata, i a\u017eurirati jedinicu sa prosekom rezultata.<\/p>\n

Brzina kojom koncentracija titranta varira u zavisnosti od okoline i uslova skladi\u0161tenja, kao \u0161to je relativna vla\u017enost. Dobro pravilo je da standardizujete titrant mese\u010dno ako fla\u0161a nije potpuno potro\u0161ena u tom vremenskom okviru. Tokom du\u017eih perioda izme\u0111u testova, bo\u010dice sa titrantima treba \u010dvrsto zatvoriti i pravilno skladi\u0161titi i re-standardizovati pre upotrebe.<\/p>\n

Ne ustru\u010davajte se da nas kontaktirate za standardizaciju titranta!<\/p>\n

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

#9 Servisiranje instrumenata<\/h3>\n

Instrumenti i alati za servisiranje i kalibraciju su klju\u010dne komponente za odr\u017eavanje ta\u010dnosti celokupnog sistema. Vage i pipete se obi\u010dno fabri\u010dki kalibri\u0161u najmanje jednom godi\u0161nje, ali predla\u017eemo da se obratite dobavlja\u010du ovih alata u vezi sa odre\u0111enim preporukama za u\u010destalost kalibracije. Ovde c\u0301emo se fokusirati na uslugu automatskih potenciometrijskih titratora Hanna Instruments.<\/p>\n

Promena nosivih delova<\/strong><\/h4>\n

Dugotrajno izlaganje titrantima mo\u017ee prouzrokovati propadanje staklenog \u0161prica unutar birete i cevi. Razgradnja ovih komponenti mo\u017ee prouzrokovati curenje, \u0161to mo\u017ee biti opasno kako za osoblje, tako i za elektroniku titratora. Tako\u0111e mo\u017ee prouzrokovati uvo\u0111enje vazduha u sistem, o \u010demu smo vec\u0301 razgovarali, a mo\u017ee imati zna\u010dajan uticaj na rezultate titracije. Ispod su op\u0161te smernice za zamenu \u0161prica i cevi na osnovu vrste i ja\u010dine titranta.<\/p>\n

<\/p>\n\n\n\n\n\n\n\n\n\n
\u0160pric<\/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 meseci<\/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

<\/p>\n\n\n\n\n\n\n
Sistem cev\u010dica<\/td>\n<\/tr>\n
Titrant<\/strong><\/td>\nU\u010destalost<\/strong><\/td>\n<\/tr>\n
Titranti koji se kristali\u0161e (tj. Srebro nitrat)<\/td>\n3 \u2013 6 meseci<\/td>\n<\/tr>\n
Ve\u0107ina ostalih<\/td>\n1 godina<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Kalibracija elektronike<\/h4>\n

Vremenom se mogu dobiti odre\u0111eni pomeraji (driftovi) ulata mV i tempeturne kalibracije potenciometrijskih titratora. Ti ulazi su elektronski signal koji elektroda i temperaturna sonda \u0161alju titratoru za prac\u0301enje reakcije i odre\u0111ivanje krajnje ta\u010dke. Kako biste odr\u017ea\u010di\u00a0\u00b10.1 mV\u00a0ta\u010dnost titratora, HANNA preporu\u010duje fabri\u010dku kalibraciju elektronskih kompenenti godi\u0161nje.<\/p>\n

Proveriti zdravlje elektrode<\/h4>\n

Uz doslednu upotrebu, elektrode c\u0301e se na kraju razgraditi i morac\u0301e biti zamenjene. Provera nagiba je tehnika koja se mo\u017ee koristiti za odre\u0111ivanje zdravlja elektrode. Odre\u0111eni postupci za proveru nagiba mogu se nac\u0301i u uputstvu za elektrode. Za ta\u010dke ekvivalentne ta\u010dke, nagibi elektroda od 60-120% su obi\u010dno dobri za titraciju. Elektrode izvan ovog opsega nagiba treba zameniti. Za odre\u0111ivanje krajnje ta\u010dke pH preporu\u010dujemo stro\u017eiko opseg nagiba od 85-105%. Op\u0161te preporuke za \u017eivotni vek elektroda su ispod, ali imajte na umu za okru\u017eenja sa velikom propusno\u0161c\u0301u, uvek se savetuje rezervna elektroda.<\/p>\n\n\n\n\n\n\n\n\n\n\n
Kada treba zamenite elektrodu?<\/td>\n<\/tr>\n
vrsta elektrode<\/strong><\/td>\nU\u010destalost<\/strong><\/td>\n<\/tr>\n
pH<\/td>\n18 \u2013 24 meseca<\/td>\n<\/tr>\n
ORP<\/td>\n3 godine<\/td>\n<\/tr>\n
\u010cvrste jon selektivne elektrode<\/td>\n3 godine<\/td>\n<\/tr>\n
ISE sa te\u010dnom membranom<\/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 Trening operatora 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 nau\u010dno obrazovanje da sve ovo imaju na umu, pa je obuka od su\u0161tinskog zna\u010daja za odr\u017eavanje ta\u010dnih rezultata.<\/p>\n

Listovi o najboljoj praksi korisni su podsetnici, ali Hanna preporu\u010duje godi\u0161nje osve\u017eavanje znanja zapslenih, 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 da govori mnogo tokom laboratorijske provere, omogu\u0107avaju\u0107i Vam na taj na\u010din mir.<\/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":17,"featured_media":152863,"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":[377],"tags":[],"class_list":["post-154634","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-laboratorija"],"yoast_head":"\nPravila titracije \u2013 odr\u017eavanje - 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