{"id":154947,"date":"2020-08-20T10:22:33","date_gmt":"2020-08-20T10:22:33","guid":{"rendered":"http:\/\/blog.hannaservice.eu\/potrebne-su-vam-precizne-karl-fischer-titracije-pocnite-sa-standardizacijom-titranta-koji-koristite\/"},"modified":"2022-10-07T13:13:29","modified_gmt":"2022-10-07T13:13:29","slug":"potrebne-su-vam-precizne-karl-fischer-titracije-pocnite-sa-standardizacijom-titranta-koji-koristite","status":"publish","type":"post","link":"https:\/\/blog.hannaservice.eu\/hr\/potrebne-su-vam-precizne-karl-fischer-titracije-pocnite-sa-standardizacijom-titranta-koji-koristite\/","title":{"rendered":"Potrebne su Vam precizne Karl Fischer titracije? Po\u010dnite sa standardizacijom titranta koji koristite."},"content":{"rendered":"\t\t
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Nisu svi standardi jednaki!<\/strong><\/h1>\n

Karl Fischer titracije su odli\u010dan i pogodan na\u010din za odre\u0111ivanje sadr\u017eaja vlage u razli\u010ditim uzorcima. Po prirodi, titranti i otapala koji su uklju\u010deni u Karl Fischer reakciju privla\u010de i reagiraju s vodom. To zna\u010di bilo koja voda \u2013 voda u Va\u0161em uzorku, voda iz atmosferske vlage u staklenoj posudi i voda u zraku u prostoru kad otvorite bocu titanta. Stoga je izuzetno va\u017eno da standardizirate svoj Karl Fischer titrant prije upotrebe i \/ ili redovno. S obzirom da morate standardizirati svoj titrant, koji standard treba koristiti?<\/p>\n

\u0160to su Karl Fischer standardi?<\/strong><\/h2>\n

Karl Fischer\u00a0standardi su certificirane kemikalije sa fiksnim sadr\u017eajem vode koje se mogu koristiti za standardizaciju (utvr\u0111ivanje prave vrijednosti) Karl Fischer titranata. Postoji nekoliko vrsta standarda: tablete, prah, teku\u0107ine i ampule.<\/p>\n

Jesu li standardi neophodni?<\/h2>\n

Ako ste prethodno provodili standardne titracije na potenciometrijskom titratoru, postoji \u0161ansa da vam je re\u010deno da Va\u0161 odre\u0111eni titrant ne treba standizirati. Karl Fischer titrant nije nu\u017eno tako robustan i stabilan skladi\u0161ten na policama kao ostali titranti. To je zbog \u010dinjenice da oni reagiraju s vodom. Ambijentalna atmosferska vlaga je dovoljna da titrant izgubi moc\u0301. Vrlo je va\u017eno, posebno ako je boca titranta ranije otvorena, da je standardizirana prije upotrebe. U suprotnom, vrijednost koja se nalazi u titratoru za mo\u0107 titranta nec\u0301e biti to\u010dna, a to c\u0301e dovesti do neto\u010dnih rezultata.<\/p>\n

Tro\u0161kovi, obja\u0161njeni<\/h2>\n

Mnogo je stvari o kojima ljudi razmi\u0161ljaju kad poku\u0161aju odlu\u010diti koja je najbolja opcija za njih i njihovu specifi\u010dnu primjenu. Na listi prioriteta prilikom razmatranja nalaze se zasigurno tro\u0161kovi. Kolika bi trebala biti cijena standarda? Kolika je cijena izvo\u0111enja po testu? Koja vrsta standarda je najekonomi\u010dnija? Hajde da ih popi\u0161emo sve! Generalno gledano, po testu, od najjeftinijeg do najskupljeg standarda, standardi se kre\u0107u od natrijum-tartarata (prah), preko teku\u0107ih (u boci)do ampula.\u00a0Standardi u tabletama\u00a0su novi na tr\u017ei\u0161tu.<\/p>\n\n\n\n\n\n\n\n\n\n
Standard<\/td>\n# mLs, gramima, kom po pakiranju ili boca<\/td>\nVolumen, Masa, Kom po kori\u0161tenju<\/td>\nTro\u0161kovi po pakiranju\/Boci<\/td>\nTro\u0161ak po kori\u0161tenju<\/td>\nProcjena tro\u0161ka za 5 kori\u0161tenja<\/td>\n<\/tr>\n
HYDRANALTM<\/sup>\u00a0Vodeni Standard 1.0<\/td>\n40 mL<\/td>\n2 mL<\/td>\noko 100 EUR<\/td>\n5EUR<\/td>\n25EUR<\/td>\n<\/tr>\n
HYDRANALTM<\/sup>\u00a0Standard 5.0<\/td>\n100 mL<\/td>\n1 mL<\/td>\n25 EUR<\/td>\n0.25 EUR<\/td>\n1.5 EUR<\/td>\n<\/tr>\n
HYDRANALTM<\/sup>\u00a0Standard 10.0<\/td>\n80 mL<\/td>\n1 mL<\/td>\noko 100 EUR<\/td>\n1.5 EUR<\/td>\n6 EUR<\/td>\n<\/tr>\n
Natrijev tartarat<\/td>\n100 g<\/td>\n0.08 g<\/td>\n50 EUR<\/td>\n0,05 EUR<\/td>\n0.20 EUR<\/td>\n<\/tr>\n
FASTRATE Tablete 2mg H2O<\/td>\n15 kom<\/td>\n1 kom<\/td>\nN\/A<\/td>\nN\/A<\/td>\nN\/A<\/td>\n<\/tr>\n
FASTRATE Tablete 10mg H2O<\/td>\n15 kom<\/td>\n1 kom<\/td>\nN\/A<\/td>\nN\/A<\/td>\nN\/A<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Koja je razlika izme\u0111u standarda?<\/h2>\n

\"Honeywell-Fluka\"Druga stvar koji trebate uzeti u razmatranje prilikom nabavke\u00a0Karl Fischer standarda\u00a0je to\u010dnost. Od najmanje to\u010dnih do najto\u010dnijih titranti su: pra\u0161ak i \/ ili tableta, teku\u0107i, a zatim ampule. Koji je najbolji za Va\u0161u primjenu? Svi donji grafikoni pokazuju ponovljivost i to\u010dnost standarda koji se izvode na Karl Fischer titratorima Hanna Instruments. Provjerite ispod.<\/p>\n

Natrijev tartarat dihidrat<\/h3>\n

\u010cvrsti i pra\u0161kasti standardi obi\u010dno se proizvode od kemikalije naziva natrijum-tartarat dihidrat. To je povoljan nehigroskopski prah bez teku\u0107ine. Ova vrsta standarda treba se koristiti samo u sustavu Karl Fischer koji koristi titrant ja\u010dine 5 mg \/ L. Velika snaga titranta potrebna je zbog visokog sadr\u017eaja vode u standardu. \u010cak i uz vec\u0301u ja\u010dinu titranata, i dalje c\u0301ete morati koristiti vrlo male koli\u010dine standarda (0,05 g do 0,10 g), u suprotnom mo\u017eete iscrpiti c\u0301eliju titratora. Visok sadr\u017eaj vode uparen sa \u010dvrstim standardom tako\u0111er zna\u010di da se mo\u017ee koristiti samo na volumetrijskom titratoru.<\/p>\n

Natrijev tartarat dihidrat ima ograni\u010denu topljivost u metanolu, koja je klju\u010dna komponenta u Karl Fischer kemikalijama. Drugim rije\u010dima, ne samo da c\u0301ete morati koristiti vrlo male koli\u010dine standarda kada ga pokrec\u0301ete zbog visokog sadr\u017eaja vode, vec\u0301 i da ne iscrpite c\u0301eliju. Kapacitet otapala za ovaj standard je samo oko 2 g na 50 ml. Ako va\u0161a metoda zahtjeva ketonske \/ aldehidne reagense ili reagense na bazi etanola, ovaj standard nec\u0301e raditi (netopljiv je).<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
** Kontrola kvaliteta instrumentacije nakon ove replike provjerava da li c\u0301elija i sustav i dalje funkcioniraju u pravim specifikacijama.<\/p>\n<\/caption>\n
HYDRANALTM<\/sup>\u00a0Natrij Tartarat Dihidrat<\/strong><\/td>\n<\/tr>\n
Replikacija<\/strong><\/td>\ng uzorka<\/strong><\/td>\nmL Titrant<\/strong><\/td>\nVrijeme<\/strong><\/td>\nDrift (ug\/min)<\/strong><\/td>\nmg\/mL Analit<\/strong><\/td>\n<\/tr>\n
1<\/td>\n0.0795<\/td>\n2.5518<\/td>\n6:07<\/td>\n11.5<\/td>\n158.15<\/td>\n<\/tr>\n
2<\/td>\n0.0799<\/td>\n2.5568<\/td>\n8:10<\/td>\n11.5<\/td>\n157.37<\/td>\n<\/tr>\n
3**<\/td>\n0.0793<\/td>\n2.5278<\/td>\n6:03<\/td>\n2.8<\/td>\n157.72<\/td>\n<\/tr>\n
4<\/td>\n0.0797<\/td>\n2.5803<\/td>\n6:05<\/td>\n5.3<\/td>\n160.00<\/td>\n<\/tr>\n
5<\/td>\n0.0796<\/td>\n2.5544<\/td>\n6:02<\/td>\n5.3<\/td>\n158.59<\/td>\n<\/tr>\n
6**<\/td>\n0.0797<\/td>\n2.5428<\/td>\n6:04<\/td>\n8.0<\/td>\n157.46<\/td>\n<\/tr>\n
<\/td>\n<\/td>\n<\/td>\n<\/td>\nProsjek<\/strong><\/td>\n158.21<\/strong><\/td>\n<\/tr>\n
<\/td>\n<\/td>\n<\/td>\n<\/td>\nStandardna Devijacija<\/strong><\/td>\n0.9864<\/strong> <\/td>\n<\/tr>\n
<\/td>\n<\/td>\n<\/td>\n<\/td>\n% RSD<\/strong><\/td>\n0.6235<\/strong><\/td>\n<\/tr>\n
<\/td>\n<\/td>\n<\/td>\n<\/td>\n% Oporavak<\/strong><\/td>\n101.03<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

HydranalTM<\/sup>\u00a0Standard 5.0<\/h3>\n

Teku\u0107i standardi su mje\u0161avina ksilena sa fiksnim sadr\u017eajem vode. Obi\u010dno su u malim bocama i treba ih \u010duvati u ne-zapaljivom ormari\u0107u. Ova vrsta standarda je topljiva u vec\u0301ini otapala. Tro\u0161kovi su umjereni. Teku\u0107i standardi su manje to\u010dni od ampula, ali to\u010dniji od \u010dvrstih.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
HYDRANALTM<\/sup>\u00a0Standard 5.0 na 1 mL<\/strong><\/td>\n<\/tr>\n
Replikacija<\/strong><\/td>\ng uzorka<\/strong><\/td>\nmL Titrant<\/strong><\/td>\nVrijeme<\/strong><\/td>\nDrift (ug\/min)<\/strong><\/td>\nmg\/mL Analit<\/strong><\/td>\n<\/tr>\n
1<\/td>\n0.9451<\/td>\n1.178<\/td>\n3:44<\/td>\n6.8<\/td>\n5.810<\/td>\n<\/tr>\n
2<\/td>\n0.9122<\/td>\n1.148<\/td>\n3:34<\/td>\n1.9<\/td>\n5.680<\/td>\n<\/tr>\n
3<\/td>\n0.9855<\/td>\n1.177<\/td>\n3:38<\/td>\n2.2<\/td>\n5.823<\/td>\n<\/tr>\n
4<\/td>\n0.9992<\/td>\n1.193<\/td>\n3:40<\/td>\n1.2<\/td>\n5.905<\/td>\n<\/tr>\n
5<\/td>\n0.9781<\/td>\n1.178<\/td>\n3:34<\/td>\n5.0<\/td>\n5.818<\/td>\n<\/tr>\n
6<\/td>\n0.9905<\/td>\n1.179<\/td>\n3:36<\/td>\n4.3<\/td>\n5.827<\/td>\n<\/tr>\n
7<\/td>\n0.9789<\/td>\n1.163<\/td>\n3:38<\/td>\n3.7<\/td>\n5.747<\/td>\n<\/tr>\n
<\/td>\n<\/td>\n<\/td>\n<\/td>\nProsjek<\/strong><\/td>\n5.801<\/strong><\/td>\n<\/tr>\n
<\/td>\n<\/td>\n<\/td>\n<\/td>\nStandardna Devijacija<\/strong><\/td>\n0.07055<\/strong> <\/td>\n<\/tr>\n
<\/td>\n<\/td>\n<\/td>\n<\/td>\n% RSD<\/strong><\/td>\n1.216<\/strong><\/td>\n<\/tr>\n
<\/td>\n<\/td>\n<\/td>\n<\/td>\n% Oporavak<\/strong><\/td>\n99.51<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Standardi u ampulama<\/h3>\n

Standardi u ampulama dolaze u razli\u010ditim koncentracijama i najto\u010dniji su dostupni vodeni standard. Oni su istovremeno i najskuplji. Mje\u0161avina ksilena u ampulama certificirana je sa fiksnim sadr\u017eajem vode i dizajnirana je za jednokratnu upotrebu. Ovi standardi se mogu koristiti i u volumetrijskim i u kulometrijskim titratorima.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n
HYDRANALTM<\/sup>\u00a0Standard 10.0, Standardizacija titranta<\/strong><\/td>\n<\/tr>\n
Replikacija<\/strong><\/td>\ng uzorka<\/strong><\/td>\nmL Titrant<\/strong><\/td>\nVrijeme<\/strong><\/td>\nDrift (ug\/min)<\/strong><\/td>\nmg\/mL Analit<\/strong><\/td>\n<\/tr>\n
1<\/td>\n1.0924<\/td>\n2.2707<\/td>\n5:57<\/td>\n6.3<\/td>\n4.837<\/td>\n<\/tr>\n
2<\/td>\n1.1517<\/td>\n2.3606<\/td>\n6:07<\/td>\n6.1<\/td>\n4.904<\/td>\n<\/tr>\n
3<\/td>\n1.1331<\/td>\n2.2939<\/td>\n6:05<\/td>\n6.5<\/td>\n4.967<\/td>\n<\/tr>\n
4<\/td>\n1.0542<\/td>\n2.1342<\/td>\n5:51<\/td>\n9.3<\/td>\n4.975<\/td>\n<\/tr>\n
5<\/td>\n1.0639<\/td>\n2.1057<\/td>\n5:47<\/td>\n9.9<\/td>\n5.090<\/td>\n<\/tr>\n
<\/td>\n<\/td>\n<\/td>\n<\/td>\nProsjek<\/strong><\/td>\n4.955<\/td>\n<\/tr>\n
<\/td>\n<\/td>\n<\/td>\n<\/td>\nStandardna Devijacija<\/strong><\/td>\n0.09369 <\/td>\n<\/tr>\n
<\/td>\n<\/td>\n<\/td>\n<\/td>\n% RSD<\/strong><\/td>\n1.891<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n\n\n\n\n\n\n\n\n\n\n
** Kontrola kvaliteta instrumentacije nakon ove replike provjerava da li c\u0301elija i sustav i dalje funkcioniraju u pravim specifikacijama.<\/p>\n<\/caption>\n
HYDRANALTM<\/sup>\u00a0Standard 1.0 (Ampule) na 2 mL<\/strong><\/td>\n<\/tr>\n
Replikacija<\/strong><\/td>\ng uzorka<\/strong><\/td>\nmL Titrant<\/strong><\/td>\nVrijeme<\/strong><\/td>\nDrift (ug\/min)<\/strong><\/td>\nmg\/mL Analit<\/strong><\/td>\n<\/tr>\n
1<\/td>\n2.120<\/td>\n0.4427<\/td>\n2:20<\/td>\n5.0<\/td>\n1.091<\/td>\n<\/tr>\n
2<\/td>\n2.061<\/td>\n0.4352<\/td>\n2:12<\/td>\n4.6<\/td>\n1.073<\/td>\n<\/tr>\n
3**<\/td>\n2.112<\/td>\n0.4372<\/td>\n2:19<\/td>\n3.3<\/td>\n1.079<\/td>\n<\/tr>\n
4<\/td>\n2.112<\/td>\n0.4369<\/td>\n2:23<\/td>\n9.9<\/td>\n1.070<\/td>\n<\/tr>\n
5**<\/td>\n2.068<\/td>\n0.4277<\/td>\n2:10<\/td>\n4.6<\/td>\n1.055<\/td>\n<\/tr>\n
<\/td>\n<\/td>\n<\/td>\n<\/td>\nProsjek<\/strong><\/td>\n1.074<\/strong><\/td>\n<\/tr>\n
<\/td>\n<\/td>\n<\/td>\n<\/td>\nStandardna Devijacija<\/strong><\/td>\n0.01330<\/strong><\/td>\n<\/tr>\n
<\/td>\n<\/td>\n<\/td>\n<\/td>\n% RSD<\/strong><\/td>\n1.239<\/strong><\/td>\n<\/tr>\n
<\/td>\n<\/td>\n<\/td>\n<\/td>\n% Oporavak<\/strong><\/td>\n106.94**<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Standardi u tabletama<\/h3>\n

Standardi u tabletama su za jednokratnu upotrebu, komprimirani, \u010dvrsti vodeni standard. Tablete su dizajnirane za upotrebu u volumetrijskim titratorima. Ovi NIST sljedivi standardi mogu se mije\u0161ati u reagensima Karl Fischer i imaju dobru ponovljivost i to\u010dnost. Oni su najnoviji na tr\u017ei\u0161tu.<\/p>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
** Kontrola kvaliteta instrumentacije nakon ove replike provjerava da li c\u0301elija i sustav i dalje funkcioniraju u pravim specifikacijama.<\/p>\n<\/caption>\n
FASTRATE Tablete 2 mg H2<\/sub>O<\/strong><\/td>\n<\/tr>\n
Replikacija<\/strong><\/td>\ng uzorka<\/strong><\/td>\nmL Titrant<\/strong><\/td>\nVrijeme<\/strong><\/td>\nDrift (ug\/min)<\/strong><\/td>\nmg\/mL Analit<\/strong><\/td>\n<\/tr>\n
1<\/td>\n1 kom<\/td>\n0.4362<\/td>\n3:12<\/td>\n7.4<\/td>\n2.138<\/td>\n<\/tr>\n
2<\/td>\n1 kom<\/td>\n0.4472<\/td>\n3:24<\/td>\n9.3<\/td>\n2.184<\/td>\n<\/tr>\n
3**<\/td>\n1 kom<\/td>\n0.4512<\/td>\n3:35<\/td>\n5.6<\/td>\n2.16<\/td>\n<\/tr>\n
4<\/td>\n1 kom<\/td>\n0.439<\/td>\n3:07<\/td>\n13.6<\/td>\n2.133<\/td>\n<\/tr>\n
5<\/td>\n1 kom<\/td>\n0.4312<\/td>\n3:03<\/td>\n5.0<\/td>\n2.122<\/td>\n<\/tr>\n
6**<\/td>\n1 kom<\/td>\n0.4371<\/td>\n3:00<\/td>\n7.7<\/td>\n2.143<\/td>\n<\/tr>\n
7<\/td>\n1 kom<\/td>\n0.4525<\/td>\n3:00<\/td>\n12.4<\/td>\n3:00<\/td>\n<\/tr>\n
<\/td>\n<\/td>\n<\/td>\n<\/td>\nProsjek<\/strong><\/td>\n2.163<\/td>\n<\/tr>\n
<\/td>\n<\/td>\n<\/td>\n<\/td>\nStandardna Devijacija<\/strong><\/td>\n0.03808<\/td>\n<\/tr>\n
<\/td>\n<\/td>\n<\/td>\n<\/td>\n% RSD<\/strong><\/td>\n1.761<\/td>\n<\/tr>\n
<\/td>\n<\/td>\n<\/td>\n<\/td>\n% Oporavak<\/strong><\/td>\n103.48<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n\n
** Kontrola kvaliteta instrumentacije nakon ove replike provjerava da li c\u0301elija i sustav i dalje funkcioniraju u pravim specifikacijama.<\/p>\n<\/caption>\n
FASTRATE Tablete 10 mg H2<\/sub>O<\/strong><\/td>\n<\/tr>\n
Replikacija<\/strong><\/td>\ng uzorka<\/strong><\/td>\nmL Titrant<\/strong><\/td>\nVrijeme<\/strong><\/td>\nDrift (ug\/min)<\/strong><\/td>\nmg\/mL Analit<\/strong><\/td>\n<\/tr>\n
1<\/td>\n1 kom<\/td>\n2.146<\/td>\n1.9<\/td>\n6:55<\/td>\n10.62<\/td>\n<\/tr>\n
2<\/td>\n1 kom<\/td>\n2.185<\/td>\n9.6<\/td>\n5:18<\/td>\n10.78<\/td>\n<\/tr>\n
3**<\/td>\n1 kom<\/td>\n2.185<\/td>\n13.9<\/td>\n6:10<\/td>\n10.74<\/td>\n<\/tr>\n
4<\/td>\n1 kom<\/td>\n2.195<\/td>\n6.8<\/td>\n6:41<\/td>\n10.83<\/td>\n<\/tr>\n
5<\/td>\n1 kom<\/td>\n2.131<\/td>\n7.7<\/td>\n5:56<\/td>\n10.51<\/td>\n<\/tr>\n
6**<\/td>\n1 kom<\/td>\n2.231<\/td>\n12.1<\/td>\n5:23<\/td>\n10.99<\/td>\n<\/tr>\n
7<\/td>\n1 kom<\/td>\n2.166<\/td>\n9.6<\/td>\n6:49<\/td>\n10.67<\/td>\n<\/tr>\n
<\/td>\n<\/td>\n<\/td>\n<\/td>\nProsjek<\/strong><\/td>\n10.73<\/strong><\/td>\n<\/tr>\n
<\/td>\n<\/td>\n<\/td>\n<\/td>\nStandardna Devijacija<\/strong><\/td>\n0.1540<\/strong> <\/td>\n<\/tr>\n
<\/td>\n<\/td>\n<\/td>\n<\/td>\n% RSD<\/strong><\/td>\n1.435<\/strong><\/td>\n<\/tr>\n
<\/td>\n<\/td>\n<\/td>\n<\/td>\n% Oporavak<\/strong><\/td>\n100.87<\/strong><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\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":"

Nisu svi standardi jednaki! Karl Fischer titracije su odli\u010dan i pogodan na\u010din za odre\u0111ivanje sadr\u017eaja […]<\/p>\n","protected":false},"author":14,"featured_media":152639,"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-154947","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-laboratorij"],"yoast_head":"\nPotrebne su Vam precizne Karl Fischer titracije? 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