SU59013A1 - Method for quantitative determination of nitrogen according to Kjeldahl - Google Patents
Method for quantitative determination of nitrogen according to KjeldahlInfo
- Publication number
- SU59013A1 SU59013A1 SU27212A SU27212A SU59013A1 SU 59013 A1 SU59013 A1 SU 59013A1 SU 27212 A SU27212 A SU 27212A SU 27212 A SU27212 A SU 27212A SU 59013 A1 SU59013 A1 SU 59013A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- kjeldahl
- quantitative determination
- nitrogen according
- acid
- solution
- Prior art date
Links
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title description 4
- 229910052757 nitrogen Inorganic materials 0.000 title description 2
- 239000002253 acid Substances 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- UIIMBOGNXHQVGW-UHFFFAOYSA-M NaHCO3 Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 4
- 238000004448 titration Methods 0.000 description 4
- PRKQVKDSMLBJBJ-UHFFFAOYSA-N Ammonium carbonate Chemical compound N.N.OC(O)=O PRKQVKDSMLBJBJ-UHFFFAOYSA-N 0.000 description 3
- BVKZGUZCCUSVTD-UHFFFAOYSA-N Carbonic acid Chemical compound OC(O)=O BVKZGUZCCUSVTD-UHFFFAOYSA-N 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 3
- 239000001099 ammonium carbonate Substances 0.000 description 3
- 235000012501 ammonium carbonate Nutrition 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000004821 distillation Methods 0.000 description 3
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 3
- KGBXLFKZBHKPEV-UHFFFAOYSA-N Boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 2
- STZCRXQWRGQSJD-GEEYTBSJSA-M Methyl orange Chemical compound [Na+].C1=CC(N(C)C)=CC=C1\N=N\C1=CC=C(S([O-])(=O)=O)C=C1 STZCRXQWRGQSJD-GEEYTBSJSA-M 0.000 description 2
- 229940012189 Methyl orange Drugs 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000004327 boric acid Substances 0.000 description 2
- 235000017557 sodium bicarbonate Nutrition 0.000 description 2
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 2
- FAPWRFPIFSIZLT-UHFFFAOYSA-M sodium chloride Chemical compound [Na+].[Cl-] FAPWRFPIFSIZLT-UHFFFAOYSA-M 0.000 description 2
- JCYPECIVGRXBMO-UHFFFAOYSA-N 4-(dimethylamino)azobenzene Chemical compound C1=CC(N(C)C)=CC=C1N=NC1=CC=CC=C1 JCYPECIVGRXBMO-UHFFFAOYSA-N 0.000 description 1
- BFNBIHQBYMNNAN-UHFFFAOYSA-N Ammonium sulfate Chemical compound N.N.OS(O)(=O)=O BFNBIHQBYMNNAN-UHFFFAOYSA-N 0.000 description 1
- 210000003491 Skin Anatomy 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- -1 alkali metal bicarbonate Chemical class 0.000 description 1
- QGZKDVFQNNGYKY-UHFFFAOYSA-O ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 description 1
- 150000003863 ammonium salts Chemical class 0.000 description 1
- 229910052921 ammonium sulfate Inorganic materials 0.000 description 1
- 235000011130 ammonium sulphate Nutrition 0.000 description 1
- 239000007864 aqueous solution Substances 0.000 description 1
- GSTANBWEAXRNHP-UHFFFAOYSA-N azanium;hydrogen carbonate;sodium Chemical compound [NH4+].[Na].OC([O-])=O GSTANBWEAXRNHP-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000002950 deficient Effects 0.000 description 1
- 238000005755 formation reaction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001264 neutralization Effects 0.000 description 1
- 230000003472 neutralizing Effects 0.000 description 1
- 230000002441 reversible Effects 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 235000011121 sodium hydroxide Nutrition 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Description
Образовавшийс свободный аммиак отгон етс ; в виду его летучести на холоду его необходимо об зательно поглощать в приемнике кислотой или титрованным раствором кислоты в избытке с последующим обратным титрованием щелочью или борной кисло (NHJsSOi + 2МаНСОз ( + СО, + , + НО.The resulting free ammonia is distilled off; in view of its cold volatility, it is necessary to absorb it in the receiver with an acid or a titrated solution of the acid in excess, followed by a back titration with alkali or boric acid (NHJsSOi + 2MaHCO3 (+ CO, +, + BUT.
Образующийс углекислый аммоний ттерегон етс с вод ным паром. На холоду же в водном растворе карбонат аммони не летуч. Хот реакци обратима , и производство соды по способу Сольве оснаваио как раз «а обратном течении реакции:The resulting ammonium carbonate is teregonated with steam. In the cold in the aqueous solution, ammonium carbonate is not volatile. Although the reaction is reversible, the production of soda according to the Solvay method is equipped just as during the reverse course of the reaction:
NaCl + NHiHCOs NaHCOg + NaCl + NHiHCOs NaHCOg +
однако, при данных услови х температуры и концентрации, реакци взаимотой с последующим пр мым титрованием кислотой.however, under the given conditions of temperature and concentration, the reaction is mutually beneficial, followed by direct titration with acid.
В отличие от этого, по предлагаемому способу, при добавке к нейтральному раствору соли аммони бикарбоната натри , получаетс :In contrast, according to the proposed method, with the addition of a sodium bicarbonate ammonium salt to a neutral solution, the following is obtained:
действи сернокислого аммони и бикарбоната натри протекает количественно исключительно по указанному направлению с образованием углекислых соединений аммони .the action of ammonium sulfate and sodium bicarbonate proceeds quantitatively exclusively in the indicated direction with the formation of carbonic compounds of ammonium.
Пример. После обычного сжигани навески (например, 0,5-0,6 г кожи ) и перенесени ее в колбу дл отгонки при осторожном взбалтывании производ т нейтрализацию свободной серной кислоты 20%-м растворомExample. After the usual burning of the sample (for example, 0.5-0.6 g of skin) and transferring it into the flask for distillation with gentle agitation, neutralizing the free sulfuric acid with a 20% solution is performed.
соды с индикатором метил-оранж. Затем добавл ют воду до объема 250- 300 мм, добавл ют 3-5 г бикарбоната натри и соедин ют колбу дл отгонки с холодильником, под конец которого подставл ют пустую колбу дл приема дестшьлата. Производитьс отгонка, пока не соберетс 100-150 мл дестиллата . Отгон титруетс с 0,2 N кислотой с индикатором метил-оранж или, еще лучше, с диметиловым желтым.soda with methyl orange indicator. Water is then added to a volume of 250-300 mm, 3-5 g of sodium bicarbonate is added, and the distillation flask is connected to a condenser, at the end of which a empty flask is added to receive a deststat. Distill until 100-150 ml of distillate is collected. The distillate is titrated with 0.2 N acid with methyl orange or, even better, with dimethyl yellow.
Преимущества предлагаемого способа состо т в том, что, во-первых, отпадает необходимость в поглощении аммиака кислотой в приемнике; во-вторых , при свободном не погруженном конце холодильника не может происходить обратного зат гивани раствора : в -колбу дл отгона, и можно по жела .йиюу подставл ть последовательные ;емдь1е колбы дл контрол полнот (Ьна; в третьих, значительно содетс продолжительность дестилл ции при свободном непогруженном конце холодильника (15-30 мин.).The advantages of the proposed method are that, firstly, there is no need for the absorption of ammonia by the acid in the receiver; secondly, when the free end of the refrigerator is not immersed, the solution cannot be retracted: into the flask for distillation, and one can substitute consecutive flashes; there is a single flask for controlling completeness (Bna; thirdly, the duration of distilling is significantly reduced with the free, immersed end of the refrigerator (15-30 minutes).
Производитс пр мое титрование аммиака без применени дефицитной борной кислоты; нет нужды в специальных насадках, и, наконец, отпадает трудоемкий процесс растворени каустической соды в виду ее замены технической содой.Direct titration of ammonia is carried out without the use of deficient boric acid; there is no need for special nozzles, and, finally, the laborious process of dissolving caustic soda is eliminated due to its replacement with technical soda.
Предмет изобретени .The subject matter of the invention.
Способ количественного определени азота по Кьельдалю, отличающийс тем, что, в цел х пр мого титровани дестиллата кислотой, к нейтрализованному раствору соли аммони добавл ют бикарбонат щелочного металла и дестиллируют раствор карбоната аммони , после чего дестиллат титруют известнВ1ми способами аналитической химии.A method for the quantitative determination of nitrogen by Kjeldahl, characterized in that, for the purpose of direct titration of distillate with acid, an alkali metal bicarbonate is added to a neutralized solution of ammonium salt and distilled ammonium carbonate solution, after which the distillate is titrated using known analytical chemistry methods.
Publications (2)
| Publication Number | Publication Date |
|---|---|
| SU12368A1 SU12368A1 (en) | 1929-12-31 |
| SU59013A1 true SU59013A1 (en) | 1941-02-28 |
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