SU72251A1 - Method for quantitative determination of pyridine bases - Google Patents
Method for quantitative determination of pyridine basesInfo
- Publication number
- SU72251A1 SU72251A1 SU4916A SU4916A SU72251A1 SU 72251 A1 SU72251 A1 SU 72251A1 SU 4916 A SU4916 A SU 4916A SU 4916 A SU4916 A SU 4916A SU 72251 A1 SU72251 A1 SU 72251A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- pyridine bases
- solution
- quantitative determination
- ammonia
- pyridine
- Prior art date
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- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Description
В основу способа положено применение буфера - насыщенного раствора одноосновного фосфорнокислого натра, имеющего ,3- 4,6, достаточный дл удержани аммиака в растворе и дл полной отгонки пиридиновых оснований.The method is based on the use of a buffer — a saturated solution of monobasic sodium phosphate, having 3–4.6 sufficient to keep the ammonia in solution and to completely distill the pyridine bases.
Описываемый способ количественного определени пиридиновых оснований заключаетс в следующем .The described method for the quantitative determination of pyridine bases is as follows.
Берут навеску анализируемого продукта из расчета содержани в ней пиридиновых оснований около 0,15 S, разбавл ют водой до 200 мл, подщелачивают при индикаторе фенолфталеине до слабого порозовени и отгон ют в аппарате Кьельдал пиридиновые основани с примесью аммиака в приемник, содержащий 10%-ный раствор серной кислоты. Дестиллат нейтрализуют по смешанному индикатору (0,1% диметилгельба и 0,1% метиленовой сини), имеющему рН 3,25.A sample of the analyzed product is taken from the calculation of about 0.15 S of pyridine bases in it, diluted with water to 200 ml, made alkaline with phenolphthalein indicator until slightly rosy, and the Kjeldahl apparatus is distilled off into the receiver containing 10% ammonia. sulfuric acid solution. The distillate is neutralized by a mixed indicator (0.1% dimethylgel and 0.1% methylene blue) having a pH of 3.25.
Полученный дестиллат количественно перенос т в аппарат Кьельдал , добавл ют к нему буферный раствор (насыщенный раствор NaH2 РО4) и отгон ют свободные отThe obtained distillate is quantitatively transferred to a Kjeldahl apparatus, a buffer solution is added to it (saturated solution of NaH2 PO4) and the free
аммиака пиридиновые основани в приемник, содержащий 0,2 N раствор серной кислоты, подкрашенной смешанным индикатором.ammonia pyridine bases to a receiver containing a 0.2 N solution of sulfuric acid tinted with a mixed indicator.
Количество пиридиновых оснований определ етс обратным титрованием свободной кислоты 0,1 N раствором щелочи.The amount of pyridine bases is determined by back titration of the free acid with a 0.1 N alkali solution.
После первичной отгонки пиридиновых оснований в растворе содержитс 0,01 мол сульфатов пиридиновых оснований, по расчету имеющих рН 3,58 и 0,01 мол сульфатаммони - рН около 5,5. При кип чении такого раствора, нейтрализованного по смешанному индикатору, при добавлении к нему буферного раствора, который поддерживает рН раствора около 4, отгон ютс только пиридиновые основани , а аммиак удерживаетс в растворе.After the initial distillation of the pyridine bases, 0.01 mol of pyridine bases sulfates are contained in the solution, calculated to have a pH of 3.58 and 0.01 mol of ammonium sulfate - pH about 5.5. When such a solution, neutralized by a mixed indicator, is boiled, adding a buffer solution that maintains the pH of the solution to about 4, only pyridine bases are distilled off, and ammonia is kept in solution.
Метод дает точность до 1 % содержани пиридиновых оснований.The method gives an accuracy of up to 1% of the content of pyridine bases.
Предмет изобретени Subject invention
Способ количественного определени пиридиновых оснований в присутствии аммиака или аммоний219Method for quantitative determination of pyridine bases in the presence of ammonia or ammonium219
№ 72251 2 -72251 2 -
ных солей, отличающийс тем,н ют пиридиновые основани , нечто после добавлени к испытуемо-содержащие аммиака, и подверму раствору одноосновного фос-гают их ацидиметрическому титрофорнокислого натри от смеси отго-ванию.salts, characterized by the addition of pyridine bases, something after adding ammonia to the test substance, and exposing them to a solution of monobasic phos- phage of their acidimetric sodium titrophoric acid from the mixture.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU4916A SU72251A1 (en) | 1943-01-25 | 1943-01-25 | Method for quantitative determination of pyridine bases |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU4916A SU72251A1 (en) | 1943-01-25 | 1943-01-25 | Method for quantitative determination of pyridine bases |
Publications (2)
Publication Number | Publication Date |
---|---|
SU69534A1 SU69534A1 (en) | 1947-10-31 |
SU72251A1 true SU72251A1 (en) | 1947-11-30 |
Family
ID=48248840
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU4916A SU72251A1 (en) | 1943-01-25 | 1943-01-25 | Method for quantitative determination of pyridine bases |
Country Status (1)
Country | Link |
---|---|
SU (1) | SU72251A1 (en) |
-
1943
- 1943-01-25 SU SU4916A patent/SU72251A1/en active
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