{"id":154937,"date":"2020-09-02T08:45:20","date_gmt":"2020-09-02T08:45:20","guid":{"rendered":"http:\/\/blog.hannaservice.eu\/pravila-titracije-analiza-rezultata\/"},"modified":"2022-10-07T13:12:11","modified_gmt":"2022-10-07T13:12:11","slug":"pravila-titracije-analiza-rezultata","status":"publish","type":"post","link":"https:\/\/blog.hannaservice.eu\/hr\/pravila-titracije-analiza-rezultata\/","title":{"rendered":"Pravila titracije \u2013 analiza rezultata"},"content":{"rendered":"\t\t<div data-elementor-type=\"wp-post\" data-elementor-id=\"154937\" class=\"elementor elementor-154937 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>Dobili ste rezultate? Sada je vrijeme za pregled.<\/h2>\n<p>Glatki graf titracije i primanje rezultata sa va\u0161eg titratora ne jam\u010di uvijek da su to\u010dni. Uvijek pregledajte svoje rezultate, izra\u010dune i provjere kvalitete.<\/p>\n<h2><\/h2>\n<h2>Pregled Rezultata<\/h2>\n<h3>#6 Upoznajte svoje specifikacije<\/h3>\n<p>Va\u017eno se zapitati, prilikom pregleda rezultata titracije: \u201cImaju li ovi rezultati smisla?\u201d To je osobito slu\u010daj kod prebacivanja metodologija, odnosno s ru\u010dnih titracija na automatske titracije. Mo\u017ee biti alarmantno vidjeti nepoznat broj, ali je va\u017eno da se pobli\u017ee pogledaju specifikacije kako bi se utvrdio uzrok odstupanja. \u010cetiri najva\u017enija dijela specifikacije za ispitivanje su jedinice, zna\u010dajne znamenke, raspon, te metodologija koja se koristi za podrijetlo specifikacija. Razgovarati \u0107emo o zna\u010daju svakog.<\/p>\n<p><img decoding=\"async\" class=\"aligncenter lazyloaded\" src=\"https:\/\/blog.hannainst.com\/hs-fs\/hubfs\/003-blog\/Blog%20Images\/crop-chemist-taking-science-notes-on-whiteboard-during-3825468.jpg?width=4500&amp;name=crop-chemist-taking-science-notes-on-whiteboard-during-3825468.jpg\" sizes=\"(max-width: 4500px) 100vw, 4500px\" srcset=\"https:\/\/blog.hannainst.com\/hs-fs\/hubfs\/003-blog\/Blog%20Images\/crop-chemist-taking-science-notes-on-whiteboard-during-3825468.jpg?width=2250&amp;name=crop-chemist-taking-science-notes-on-whiteboard-during-3825468.jpg 2250w, https:\/\/blog.hannainst.com\/hs-fs\/hubfs\/003-blog\/Blog%20Images\/crop-chemist-taking-science-notes-on-whiteboard-during-3825468.jpg?width=4500&amp;name=crop-chemist-taking-science-notes-on-whiteboard-during-3825468.jpg 4500w, https:\/\/blog.hannainst.com\/hs-fs\/hubfs\/003-blog\/Blog%20Images\/crop-chemist-taking-science-notes-on-whiteboard-during-3825468.jpg?width=6750&amp;name=crop-chemist-taking-science-notes-on-whiteboard-during-3825468.jpg 6750w, https:\/\/blog.hannainst.com\/hs-fs\/hubfs\/003-blog\/Blog%20Images\/crop-chemist-taking-science-notes-on-whiteboard-during-3825468.jpg?width=9000&amp;name=crop-chemist-taking-science-notes-on-whiteboard-during-3825468.jpg 9000w, https:\/\/blog.hannainst.com\/hs-fs\/hubfs\/003-blog\/Blog%20Images\/crop-chemist-taking-science-notes-on-whiteboard-during-3825468.jpg?width=11250&amp;name=crop-chemist-taking-science-notes-on-whiteboard-during-3825468.jpg 11250w, https:\/\/blog.hannainst.com\/hs-fs\/hubfs\/003-blog\/Blog%20Images\/crop-chemist-taking-science-notes-on-whiteboard-during-3825468.jpg?width=13500&amp;name=crop-chemist-taking-science-notes-on-whiteboard-during-3825468.jpg 13500w\" alt=\"crop-chemist-taking-science-notes-on-whiteboard-during-3825468\" width=\"4500\" data-ll-status=\"loaded\" \/><\/p>\n<h4>Izra\u010dun rezultata:<\/h4>\n<p>Postoji mnogo razli\u010ditih na\u010dina da se predstave rezultati titracije. Jedinice specifikacija mogu varirati, ali specifikacije su obi\u010dno zastupljene u %, ppm (mg\/L ili mg\/g), ili jednostavno mL (mililitri) titranta koji se koristi za odre\u0111ivanje krajnje to\u010dke. Rezultati se mogu prilagoditi u postavkama metoda kako bi se podudarali s onima iz specifikacija u vi\u0161e slu\u010dajeva. Rezultati koji se razlikuju od izvorne specifikacije po zajedni\u010dkom faktoru, kao 10 ili 1000 naj\u010de\u0161\u0107e se pripisuju razlici u jedinicama i mogu se lako podesiti.<\/p>\n<p>Drugi dio jedinice je analit, ili koja se specifi\u010dna kemikalija testira. Kako bi se osiguralo da rezultati odgovaraju specifikaciji, treba biti jasno koji se oblik analita predstavlja.<\/p>\n<p>U primjeru titracije soli, neki kupci preferiraju da se rezultati predstavljaju u natrijevom kloridu, dok neke specifikacije predstavljaju rezultat samo kao kloride. Titracija je potpuno ista za obje jedinice, ali izra\u010dunati rezultati se razlikuju zbog razlike molarne mase izme\u0111u natrijevog klorida i klorida. U slu\u010daju kiselina, rezultati titracije su obi\u010dno zastupljeni u jedinicama dominantne kiseline. Specifikacija koja je zapisana u % mlije\u010dne kiseline, uvelike bi se razlikovala od rezultata zastupljenog u % limunske kiseline. To je istina, ne samo zbog razlika u molarnoj masi, ali i omjer reakcije izme\u0111u titranta i specifi\u010dne kiseline. Ta odstupanja se lako mogu ispraviti u metodi tako da rezultati odgovaraju specifikaciji.<\/p>\n<h4><strong>Raspon:<\/strong><\/h4>\n<p>Obi\u010dno se specifikacije pi\u0161u kao raspon. Na primjer, kao \u0161to je prethodno opisano, uzorak treba sadr\u017eavati izme\u0111u 2,0% do 2,5% natrijevog klorida. Imaju\u0107i \u0161iroki stupanj tolerancije u rasponu specifikacije omogu\u0107uje neki na\u010din za u\u0161tedu vremena i izvore pogre\u0161ke. Vrlo uski raspon specifikacije zahtijevat \u0107e dobru laboratorijsku tehniku i pridr\u017eavanje najboljih praksi kako bi se osiguralo da su postignuti rezultati to\u010dni.\u00a0Specifikacije treba napisati s obzirom na ta ograni\u010denja, kao i na temelju o\u010dekivane koncentracije analita.\u00a0Slijede AOAC smjernice za postotak oporavka i postotak relativne standardne devijacije (% RSD) na temelju o\u010dekivane koncentracije analita.<\/p>\n<table border=\"1\" cellpadding=\"4\">\n<caption>Tablica izvu\u010dena iz AOAC-a<em>Peer-Verified Methods Program, Manual on Policies and Procedures<\/em>\u00a0(1998) AOAC INTERNATIONAL, Rockville, MD, USA.<\/caption>\n<tbody>\n<tr>\n<td>Koncentracija analita<\/td>\n<td>% Oporavak<\/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 mogu\u0107e, uvijek je dobro razumjeti metodologiju kori\u0161tenu za izradu specifikacije. Razli\u010dite metode imaju razli\u010dit stupanj to\u010dnosti i jedinstvene potencijalne smetnje. Pri prelasku s jedne metodologije na drugu, tj. S ru\u010dne na automatsku titraciju, mo\u017ee do\u0107i do male razlike u rezultatima. U slu\u010daju ru\u010dnog titriranja, krajnja to\u010dka je \u010desto prekora\u010dena i rezultati se mogu razlikovati me\u0111u operaterima. To dovodi do ne\u0161to ve\u0107ih brojeva od stvarnih rezultata. Specifikacije \u0107e mo\u017eda trebati preispitati prilikom zamjene metodologija kako bi se pobolj\u0161ala to\u010dnost specifikacije.<\/p>\n<p>Ukratko, poznavanje specifikacija znatno \u0107e olak\u0161ati tuma\u010denje rezultata titracije. Provo\u0111enje provjera kvalitete, o kojima se govori u nastavku, pomo\u0107i \u0107e osigurati to\u010dnost rezultata titracije.<\/p>\n<div><strong>Ovdje pogledajte automatsku titraciju!<\/strong><\/div>\n<h3>#7 Provedba provjera kvalitete<\/h3>\n<p><img decoding=\"async\" class=\"aligncenter lazyloaded\" src=\"https:\/\/blog.hannainst.com\/hs-fs\/hubfs\/003-blog\/Blog%20Images\/laboratory-test-tubes-2280549.jpg?width=6016&amp;name=laboratory-test-tubes-2280549.jpg\" sizes=\"(max-width: 6016px) 100vw, 6016px\" srcset=\"https:\/\/blog.hannainst.com\/hs-fs\/hubfs\/003-blog\/Blog%20Images\/laboratory-test-tubes-2280549.jpg?width=3008&amp;name=laboratory-test-tubes-2280549.jpg 3008w, https:\/\/blog.hannainst.com\/hs-fs\/hubfs\/003-blog\/Blog%20Images\/laboratory-test-tubes-2280549.jpg?width=6016&amp;name=laboratory-test-tubes-2280549.jpg 6016w, https:\/\/blog.hannainst.com\/hs-fs\/hubfs\/003-blog\/Blog%20Images\/laboratory-test-tubes-2280549.jpg?width=9024&amp;name=laboratory-test-tubes-2280549.jpg 9024w, https:\/\/blog.hannainst.com\/hs-fs\/hubfs\/003-blog\/Blog%20Images\/laboratory-test-tubes-2280549.jpg?width=12032&amp;name=laboratory-test-tubes-2280549.jpg 12032w, https:\/\/blog.hannainst.com\/hs-fs\/hubfs\/003-blog\/Blog%20Images\/laboratory-test-tubes-2280549.jpg?width=15040&amp;name=laboratory-test-tubes-2280549.jpg 15040w, https:\/\/blog.hannainst.com\/hs-fs\/hubfs\/003-blog\/Blog%20Images\/laboratory-test-tubes-2280549.jpg?width=18048&amp;name=laboratory-test-tubes-2280549.jpg 18048w\" alt=\"laboratory-test-tubes-2280549\" width=\"6016\" data-ll-status=\"loaded\" \/><\/p>\n<p>Provjere kvalitete obi\u010dno koriste laboratoriji kako bi osigurali to\u010dnost svojih prijavljenih rezultata. Primjenom provjera kvalitete u va\u0161 postupak analize ne\u0107ete imati samo du\u0161evni mir, ve\u0107 \u0107ete imati i dokumentaciju u slu\u010daju da se rezultati dovedu u pitanje. Postoji nekoliko vrsta provjera kvalitete, ali mi \u0107emo se usredoto\u010diti na slijepe probe, laboratorijske kontrolne \u0161iljke, duplikate i matri\u010dne \u0161iljke.<\/p>\n<h4>Praznine<\/h4>\n<p>Slijepa je uzorak va\u0161eg otapala koji se provodi kroz postupak pripreme uzorka, a zatim titrira kako bi se osiguralo da nema nikakvih smetnji ili one\u010di\u0161\u0107enja iz postupka analize. Imajte na umu da se svaki dozirani titrant ra\u010duna u rezultate. Titrant koji reagira s va\u0161im otapalom ne bi trebao biti uklju\u010den u rezultate uzorka i mo\u017ee se uzeti u obzir u opcijama metode titratora.<\/p>\n<h4>Laboratory Control Spike (LCS)<\/h4>\n<p>Laboratorijski kontrolni \u0161iljak, skra\u0107eno LCS, standard je poznate koncentracije analita koji se provodi kroz postupak analize uzorka kako bi se procijenila to\u010dnost titracijske metode. Na primjer, ako titriramo koncentraciju nikla u kupki za galvanizaciju, za provjeru to\u010dnosti postupka ispitivanja upotrijebili bismo normu provjerene koncentracije nikla. AOAC je objavio smjernice o postotku oporavka s obzirom na koncentraciju analita koje su gore navedene. Laboratorijski kontrolni \u0161iljci mogu se koristiti za potvr\u0111ivanje novih metoda ili za osiguravanje trajne to\u010dnosti postoje\u0107ih metoda.<\/p>\n<h4>Duplikati<\/h4>\n<p>Duplikat je uzorak koji se provodi analizom uzorka kao dva neovisna uzorka kako bi se osiguralo da se rezultati metode mogu ponoviti. \u010cesto se prilikom provjere valjanosti novih metoda analizira vi\u0161e ponavljanja kako bi se utvrdilo relativno standardno odstupanje (RSD) izme\u0111u uzoraka. AOAC tako\u0111er ima smjernice za% RSD jer se odnose na koncentraciju analita.<\/p>\n<h4>Matri\u010dni \u0161iljak uzorka (MS)<\/h4>\n<p>\u0160iljak matrice uzorka, \u010desto skra\u0107eno MS, uzorak je koji se duplicira i kojem se u jednu od replikacija dodaje standard poznate koncentracije. Matri\u010dni \u0161iljci korisni su kako biste odredili ometaju li ostale komponente va\u0161eg uzorka metode.<\/p>\n<blockquote><p><strong>Napomena:<\/strong>\u00a0Provjere kvalitete nisu ograni\u010dene na titrator. Pipete i vage tako\u0111er se mogu provjeriti pomo\u0107u referentnog materijala kako bi se osiguralo da odr\u017eavaju svoju preciznost i to\u010dnost. Provjere kvalitete mogu se izvoditi onoliko \u010desto koliko je po\u017eeljno, ali se obi\u010dno provode barem svakodnevno ili na po\u010detku svake smjene.<\/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 dio serije blogova o titraciji? Ne brinite, samo kliknite na linkove ispod:<\/p>\n<p><a href=\"https:\/\/hannainst.hr\/pravila-titracije-priprema-uzorka\/\">Part 1 \u2013 Pravila titracije \u2013 priprema uzorka<\/a><\/p>\n<p><a href=\"https:\/\/hannainst.hr\/pravila-titracije-analiza\/\">Part 2 \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>Dobili ste rezultate? Sada je vrijeme za pregled. Glatki graf titracije i primanje rezultata sa [&hellip;]<\/p>\n","protected":false},"author":14,"featured_media":152788,"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":[354,387],"tags":[],"class_list":["post-154937","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","category-laboratorij"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.2 - 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