SU72251A1 - Method for quantitative determination of pyridine bases - Google Patents

Method for quantitative determination of pyridine bases

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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
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SU
USSR - Soviet Union
Prior art keywords
pyridine bases
solution
quantitative determination
ammonia
pyridine
Prior art date
Application number
SU4916A
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Russian (ru)
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SU69534A1 (en
Inventor
М.Е. Неймарк
Original Assignee
М.Е. Неймарк
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Publication date
Application filed by М.Е. Неймарк filed Critical М.Е. Неймарк
Priority to SU4916A priority Critical patent/SU72251A1/en
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Publication of SU69534A1 publication Critical patent/SU69534A1/en
Publication of SU72251A1 publication Critical patent/SU72251A1/en

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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.

SU4916A 1943-01-25 1943-01-25 Method for quantitative determination of pyridine bases SU72251A1 (en)

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

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