{"id":154632,"date":"2020-09-02T08:45:20","date_gmt":"2020-09-02T08:45:20","guid":{"rendered":"https:\/\/blog.hannaservice.eu\/pravila-titracije-pregled-rezultata\/"},"modified":"2022-10-10T08:51:33","modified_gmt":"2022-10-10T08:51:33","slug":"pravila-titracije-pregled-rezultata","status":"publish","type":"post","link":"https:\/\/blog.hannaservice.eu\/sr\/pravila-titracije-pregled-rezultata\/","title":{"rendered":"Pravila titracije \u2013 pregled rezultata"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"154632\" class=\"elementor elementor-154632 elementor-133894\" data-elementor-post-type=\"post\">\n\t\t\t\t\t\t<section class=\"elementor-section elementor-top-section elementor-element elementor-element-356f1222 elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"356f1222\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-1494e547\" data-id=\"1494e547\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-2277f0a9 elementor-widget elementor-widget-text-editor\" data-id=\"2277f0a9\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<h2>Dobijeni rezultati? Sada je vreme za preglede!<\/h2>\n<p>\u201cDoterani\u201d grafik titracije i dobijeni rezultati ne garantuju uvek da je obavljena analiza bila ta\u010dna. Uvek proveravajte Va\u0161e rezultate, prora\u010dune i izvodite provere kvaliteta.<\/p>\n<h2><\/h2>\n<h2>Pregled rezultata<\/h2>\n<h3>#6 Morate znati specifikacije<\/h3>\n<p>Va\u017eno je prilikom pregleda rezultata titracije zapitati se: \u201eDa li ovaj rezultat ima smisla?\u201c. Ovo je naro\u010dito va\u017eno kada menjate metodologiju, odnosno kada sa ru\u010dnih titracija prelazite na automatske titracije. Mo\u017ee biti veoma alarmantno videti nepoznatu vrednost, ali va\u017eno je da pa\u017eljivije pogledate svoje specifikacije kako biste utvrdili mogu\u0107i uzrok odstupanja. \u010cetiri najva\u017enija dela specifikacije za ispitivanje su jedinice, zna\u010dajne cifre, opseg i metodologija kori\u0161c\u0301ena za izradu specifikacija. Razgovarac\u0301emo o zna\u010daju svakog.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/blog.hannaservice.eu\/wp-content\/uploads\/2021\/05\/crop-chemist-taking-science-notes-on-whiteboard-during-3825468-300x214.jpg\" \/><\/p>\n<h4>Prora\u010dun rezultata:<\/h4>\n<p>Postoji mnogo razli\u010ditih na\u010dina za predstavljanje rezultata titracije. Jedinice specifikacija mogu se razlikovati, ali specifikacije su obi\u010dno predstavljene u %, ppm (mg \/ L ili mg \/ g) ili jednostavno ml (mililitri) titranta koji se koristi za odre\u0111ivanje krajnje ta\u010dke. Rezultati se mogu prilagoditi u opcijama metoda kako bi se u vec\u0301ini slu\u010dajeva podudarali sa specifikacijama. Rezultati koji se razlikuju od originalnih specifikacija zajedni\u010dkim faktorom, poput 10 ili 1000, naj\u010de\u0161c\u0301e se pripisuju razlici u jedinicama i lako se mogu prilagoditi.<\/p>\n<p>Drugi deo jedinice je analit ili odre\u0111ena hemikalija koja se ispituje. Da bi se osiguralo da se rezultati podudaraju sa specifikacijom, mora biti jasno koji je oblik analita predstavljen.<\/p>\n<p>U primeru titracije soli, neki korisnici preferiraju da rezultati budu predstavljeni u jedinicama natrijum hlorida, dok neke specifikacije predstavljaju rezultate u samo hloridima. Titracija je potpuno ista za obe jedinice, ali izra\u010dunati rezultati se razlikuju zbog razlike u molarnoj masi izme\u0111u natrijum hlorida i hlorida. U slu\u010daju kiselosti, rezultati titracije su obi\u010dno predstavljeni u jedinicama prete\u017ene kiseline. Specifikacija napisana u % mle\u010dne kiseline bi se u velikoj meri razlikovala od rezultata predstavljenog u % limunske kiseline. To je ta\u010dno, ne samo zbog razlika u molarnoj masi, vec\u0301 i reakcionog odnosa izme\u0111u titranta i specifi\u010dne kiseline. Ova odstupanja mogu se lako ispraviti u metodi tako da rezultati odgovaraju specifikaciji.<\/p>\n<h4><strong>Opseg:<\/strong><\/h4>\n<p>Obi\u010dno se specifikacije pi\u0161u kao opseg. Na primer, kao \u0161to je gore razmatrano, uzorak treba da sadr\u017ei izme\u0111u 2,0% i 2,5% natrijum hlorida. Imati \u0161irok stepen tolerancije u opsegu specifikacija omoguc\u0301ava odre\u0111eni slobodan prostor za u\u0161tedu vremena i izvore gre\u0161aka. Veoma uski opseg specifikacija zahtevac\u0301e dobru laboratorijsku tehniku i po\u0161tovanje najboljih praksi kako bi se osiguralo da su postignuti rezultati ta\u010dni.\u00a0Specifikacije treba napisati s obzirom na ova ograni\u010denja, kao i na osnovu o\u010dekivane koncentracije analita.\u00a0Slede smernice AOAC za procenat oporavka i procenat relativne standardne devijacije (% RSD) na osnovu o\u010dekivane koncentracije analita.<\/p>\n<table border=\"1\" cellpadding=\"4\">\n<caption>Tabela izvu\u010dena iz AOAC<em>Program verifikovanih metoda, Priru\u010dnik o politikama i procedurama<\/em>\u00a0(1998) AOAC INTERNATIONAL, Rockville, MD, USA.<\/caption>\n<tbody>\n<tr>\n<td>Koncentracija analita<\/td>\n<td>% oporavka<\/td>\n<td>% RSD<\/td>\n<\/tr>\n<tr>\n<td>100%<\/td>\n<td>98 \u2013 102<\/td>\n<td>1.32.7<\/td>\n<\/tr>\n<tr>\n<td>10%<\/td>\n<td>98 \u2013 102<\/td>\n<td>1.9<\/td>\n<\/tr>\n<tr>\n<td>1%<\/td>\n<td>97 \u2013 103<\/td>\n<td>3.7<\/td>\n<\/tr>\n<tr>\n<td>100 ppm (mg\/kg; mg\/L)<\/td>\n<td>95 \u2013 105<\/td>\n<td>5.3<\/td>\n<\/tr>\n<tr>\n<td>10 ppm (mg\/kg; mg\/L)<\/td>\n<td>90 \u2013 107<\/td>\n<td>7.3<\/td>\n<\/tr>\n<tr>\n<td>1 ppm (mg\/kg; mg\/L)<\/td>\n<td>80 \u2013 110<\/td>\n<td>11<\/td>\n<\/tr>\n<tr>\n<td>100 ppb (\u03bcg\/kg; \u03bcg\/L)<\/td>\n<td>80 \u2013 110<\/td>\n<td>15<\/td>\n<\/tr>\n<tr>\n<td>10 ppb (\u03bcg\/kg; \u03bcg\/L)<\/td>\n<td>60 \u2013 115<\/td>\n<td>21<\/td>\n<\/tr>\n<tr>\n<td>1 ppb (\u03bcg\/kg; \u03bcg\/L)<\/td>\n<td>40 \u2013 120<\/td>\n<td>30<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<h4>Metodologija:<\/h4>\n<p>Kad god je to moguc\u0301e, uvek je dobra ideja da se razume metodologija kori\u0161c\u0301ena za izradu specifikacije. Razli\u010dite metode imaju razli\u010dit stepen ta\u010dnosti i jedinstvene potencijalne smetnje. Pri prelasku sa jedne metodologije na drugu, tj. Sa ru\u010dne na automatsku titraciju, mo\u017ee doc\u0301i do male razlike u rezultatima. U slu\u010daju ru\u010dnog titracije, krajnja ta\u010dka je \u010desto prekora\u010dena i rezultati se mogu razlikovati me\u0111u operaterima. To dovodi do ne\u0161to vec\u0301ih vrednosti od stvarnih rezultata. Specifikacije c\u0301e mo\u017eda trebati preispitati prilikom zamene metodologija kako bi se pobolj\u0161ala ta\u010dnost specifikacije.<\/p>\n<p>Ukratko, poznavanje specifikacija znatno c\u0301e olak\u0161ati tuma\u010denje rezultata titracije. Sprovo\u0111enje provere kvaliteta, o kojima c\u0301e biti re\u010di u nastavku, pomoc\u0301i c\u0301e da se osigura ta\u010dnost rezultata titracije.<\/p>\n<div><strong>Pogledajte HANNA automatske titracione sisteme!<\/strong><\/div>\n<h3>#7 Sprovo\u0111enje provera kvaliteta<\/h3>\n<p><img decoding=\"async\" src=\"https:\/\/blog.hannaservice.eu\/wp-content\/uploads\/2021\/05\/laboratory-test-tubes-2280549-1-300x200.jpg\" \/><\/p>\n<p>Provere kvaliteta obi\u010dno koriste laboratorije da bi se osigurala ta\u010dnost njihovih prijavljenih rezultata. Uvo\u0111enjem provere kvaliteta u postupak analize, ne samo da c\u0301ete imati mira, vec\u0301 c\u0301ete dobiti i dokumentaciju u slu\u010daju da se rezultati dovedu u pitanje. Postoji nekoliko vrsta provere kvaliteta, ali mi c\u0301emo se fokusirati na blanko, laboratorijsku kontrolu \u0161iljaka (odstupanja), duplikata i matri\u010dnih \u0161iljaka (odstupanja).<\/p>\n<h4>Blanko uzorak<\/h4>\n<p>Blanko je uzorak va\u0161eg rastvara\u010da koji se sprovodi kroz postupak pripreme uzorka, a zatim titruje kako bi se osiguralo da nema nikakvih smetnji ili kontaminacije iz postupka analize. Zapamtite da se svaki dobijeni titrant ra\u010duna u rezultate. Titrant koji reaguje sa va\u0161im rastvara\u010dem ne bi trebalo da bude uklju\u010den u rezultate uzorka i mo\u017ee se uzeti u obzir u opcijama metoda titratora.<\/p>\n<h4>Laboratorijska kontrola odstupanja (\u0161iljaka\/spikes)<\/h4>\n<p>Laboratorijski kontrolni \u0161iljak, skrac\u0301eno LCS, je standard poznate koncentracije analita koji se sprovodi kroz postupak analize uzorka radi procene ta\u010dnosti metode titracije. Na primer, ako bismo titrovali koncentraciju nikla u kadi za galvanizaciju, koristili bismo standard nikla verifikovane koncentracije da bismo potvrdili ta\u010dnost postupka ispitivanja. AOAC je objavio smernice o procentnom oporavku koji se odnose na koncentraciju analita koji su gore navedeni. Laboratorijski kontrolni \u0161iljci mogu se koristiti za potvr\u0111ivanje novih metoda ili za obezbe\u0111ivanje kontinuirane ta\u010dnosti trenutnih metoda.<\/p>\n<h4>Duplikati<\/h4>\n<p>Duplikat je uzorak koji se kroz analizu uzoraka prenosi kao dva nezavisna uzorka kako bi se osiguralo da se rezultati metode mogu ponoviti. \u010cesto se prilikom validacije novih metoda analizira vi\u0161e ponavljanja kako bi se utvrdilo relativno standardno odstupanje \u2013 devijacija (RSD) izme\u0111u uzoraka. AOAC tako\u0111e ima smernice za % RSD, jer se odnose na koncentraciju analita.<\/p>\n<h4>Matri\u010dni \u0161iljak uzorka (MS)<\/h4>\n<p>Matri\u010dni \u0161iljak je uzorak koji se duplira i kojem se jednom od duplikata dodaje standard poznate koncentracije. Matri\u010dni \u0161iljci su korisni u odre\u0111ivanju da li ostale komponente Va\u0161eg uzorka ometaju metode.<\/p>\n<blockquote><p><strong>Napomena:<\/strong>\u00a0Provera kvaliteta nije ograni\u010dena na titrator. Pipete i vage se tako\u0111e mogu proveriti pomoc\u0301u referentnog materijala kako bi se osiguralo da odr\u017eavaju svoju preciznost i ta\u010dnost. Provera kvaliteta mo\u017ee se vr\u0161iti onoliko \u010desto koliko je po\u017eeljno, ali se obi\u010dno vr\u0161i najmanje jednom dnevno ili na po\u010detku svake smene.<\/p><\/blockquote>\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<section class=\"elementor-section elementor-top-section elementor-element elementor-element-869bf6c elementor-section-boxed elementor-section-height-default elementor-section-height-default\" data-id=\"869bf6c\" data-element_type=\"section\" data-e-type=\"section\">\n\t\t\t\t\t\t<div class=\"elementor-container elementor-column-gap-default\">\n\t\t\t\t\t<div class=\"elementor-column elementor-col-100 elementor-top-column elementor-element elementor-element-b72acf2\" data-id=\"b72acf2\" data-element_type=\"column\" data-e-type=\"column\">\n\t\t\t<div class=\"elementor-widget-wrap elementor-element-populated\">\n\t\t\t\t\t\t<div class=\"elementor-element elementor-element-a5499b2 elementor-widget elementor-widget-text-editor\" data-id=\"a5499b2\" data-element_type=\"widget\" data-e-type=\"widget\" data-widget_type=\"text-editor.default\">\n\t\t\t\t\t\t\t\t\t<p>Propustili ste prvi deo serije blogova o titraciji? Ne brinite, kliknite na neki od linkova ispod:<\/p>\n<p><a href=\"https:\/\/hannainstruments.rs\/pravila-titracije-priprema-uzorka\/\">Prvi deo \u2013 Pravila titracije \u2013 Priprema uzorka<\/a><\/p>\n<p><a href=\"https:\/\/hannainstruments.rs\/pravila-titracije-analiza\/\">Drugi deo \u2013 Pravila titracije \u2013 Analiza<\/a><\/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":"<p>Dobijeni rezultati? Sada je vreme za preglede! \u201cDoterani\u201d grafik titracije i dobijeni rezultati ne garantuju [&hellip;]<\/p>\n","protected":false},"author":17,"featured_media":152791,"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":[354,377],"tags":[],"class_list":["post-154632","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","category-laboratorija"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.4 - 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