Mfundo yogwira ntchito ya Kjeldahl nitrogen determination

Malinga ndi mfundo ya Kjeldahl nitrogen determination, masitepe atatu amafunikira kuti adziwe, zomwe ndi digestion, distillation ndi titration.

Kugaya chakudya: Kutenthetsa nitrogen wokhala ndi organic compounds (mapuloteni) pamodzi ndi concentrated sulfuric acid ndi catalysts (copper sulfate kapena Kjeldahl digestion tablets) kuti awole puloteni. Mpweya ndi haidrojeni amathiridwa mu carbon dioxide ndi madzi kuti athawe, pamene organic Nayitrojeni amasinthidwa kukhala ammonia (NH3) ndikuphatikizidwa ndi sulfuric acid kupanga ammonium sulfate. (Ammonium NH4+)

Kagayidwe kachakudya: Kutentha ndi kutentha pang'ono kuwira, chinthu chomwe chili mu botolo chimapangidwa ndi mpweya ndikuda, ndipo chithovu chochuluka chimapangidwa. Chithovucho chitazimiririka, onjezani chowotchera moto kuti chikhale chowira pang'ono. Madziwo akakhala obiriwira komanso obiriwira, pitirizani kutentha kwa 05-1h, ndikuzizira pambuyo pomaliza. (Mutha kugwiritsa ntchito chida cham'mimba chodziwikiratu kuti mumalize ntchito yokonzekera)

Distillation: Yankho lopezedwa limachepetsedwa kukhala voliyumu yosalekeza ndikuwonjezeredwa ndi NaOH kuti amasule NH3 ndi distillation. Pambuyo pa condensation, amasonkhanitsidwa mu njira ya boric acid.

Njira ya distillation: Choyamba, chitsanzo chogayidwa chimachepetsedwa, NaOH imawonjezeredwa, ndipo mpweya wa ammonia wopangidwa pambuyo pa kutentha umalowa mu condenser, ndipo umalowa mu botolo lolandira lomwe lili ndi boric acid solution mutasungunuka. Amapanga ammonium borate. (Chizindikiro chosakanikirana chimawonjezeredwa ku njira ya boric acid. Pambuyo pa ammonium borate, njira yoyamwitsa imasintha kuchoka ku acidic kupita ku alkaline, ndipo mtundu umasintha kuchokera ku chibakuwa kupita ku buluu wobiriwira.)

Titration: Titrate ndi hydrochloric acid muyezo njira ya ndende yodziwika, kuwerengera nayitrogeni zili molingana ndi kuchuluka kwa asidi hydrochloric anadya, ndiyeno kuchulukitsa ndi lolingana kutembenuka factor kupeza zomanga thupi. (Titration imatanthawuza njira yowunikira kuchuluka kwake komanso ntchito yoyesera mankhwala. Imagwiritsa ntchito kuchuluka kwa mayankho awiri kuti adziwe zomwe zili mu solute inayake. Imawonetsa kumapeto kwa titration molingana ndi kusintha kwa mtundu wa chizindikiro, kenako ndikuwona kugwiritsa ntchito yankho lokhazikika Volume, kuwerengera ndi kusanthula zotsatira.)

Njira ya Titration: Dontholani mulingo wa hydrochloric acid mu njira ya ammonium borate kuti musinthe mtundu wake kuchoka ku buluu wobiriwira kukhala wofiira.

DRK-K616 automatic Kjeldahl nitrogen analyzerndi chowunikira chanzeru chodziwikiratu kuti chidziwe za nayitrogeni potengera njira ya Kjeldahl. Itha kugwiritsidwa ntchito kwambiri pokonza chakudya, kupanga chakudya, fodya, kuweta nyama, feteleza wanthaka, kuyang'anira zachilengedwe, mankhwala, ulimi, kafukufuku wasayansi, kuphunzitsa, kuyang'anira khalidwe ndi madera ena pofufuza nayitrogeni ndi mapuloteni mu macro ndi theka-micro. zitsanzo. Itha kugwiritsidwanso ntchito ngati mchere wa ammonium, Kuzindikira kwamafuta acids / alkali osakhazikika, ndi zina. Mukamagwiritsa ntchito njira ya Kjeldahl kuti mudziwe zachitsanzo, imayenera kudutsa njira zitatu zakugaya, distillation, ndi titration. Distillation ndi titration ndiye njira zazikulu zoyezera za DRK-K616 Kjeldahl nitrogen analyzer. Mtundu wa DRK-K616 wa Kjeldahl nitrogen analyzer ndi njira yoyezera nayitrogeni yokhazikika yokhayokha komanso njira yoyezera nayitrogeni yopangidwa motsatira njira yachikale ya Kjeldahl nitrogen determination; chida ichi amapereka mwayi lalikulu kwa oyesa zasayansi m`kati kudziwa nayitrogeni-mapuloteni. , Ndipo ali ndi makhalidwe otetezeka ndi odalirika ntchito; ntchito yosavuta komanso yopulumutsa nthawi. Chiwonetsero cha zokambirana za ku China chimapangitsa wogwiritsa ntchito kukhala wosavuta kugwiritsa ntchito, mawonekedwe ake ndi ochezeka, ndipo chidziwitso chowonetsedwa ndi cholemera, kotero kuti wogwiritsa ntchito amatha kumvetsa mwamsanga kugwiritsa ntchito chidacho.

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