SU192194A1 - METHOD FOR QUANTITATIVE DETERMINATION OF LIMON ACID CONTAINED IN SOLUTION - Google Patents
METHOD FOR QUANTITATIVE DETERMINATION OF LIMON ACID CONTAINED IN SOLUTIONInfo
- Publication number
- SU192194A1 SU192194A1 SU1053772A SU1053772A SU192194A1 SU 192194 A1 SU192194 A1 SU 192194A1 SU 1053772 A SU1053772 A SU 1053772A SU 1053772 A SU1053772 A SU 1053772A SU 192194 A1 SU192194 A1 SU 192194A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- solution
- quantitative determination
- limon
- acid contained
- chloroform
- Prior art date
Links
- 239000002253 acid Substances 0.000 title description 2
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 15
- HEDRZPFGACZZDS-UHFFFAOYSA-N chloroform Chemical compound ClC(Cl)Cl HEDRZPFGACZZDS-UHFFFAOYSA-N 0.000 description 12
- 238000000605 extraction Methods 0.000 description 5
- OEQPNRAFDGLBAW-UHFFFAOYSA-N 1,1,1,3,3-pentabromopropan-2-one Chemical compound BrC(Br)C(=O)C(Br)(Br)Br OEQPNRAFDGLBAW-UHFFFAOYSA-N 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 238000001228 spectrum Methods 0.000 description 3
- IOLCXVTUBQKXJR-UHFFFAOYSA-M Potassium bromide Chemical compound [K+].[Br-] IOLCXVTUBQKXJR-UHFFFAOYSA-M 0.000 description 2
- VZJVWSHVAAUDKD-UHFFFAOYSA-N Potassium permanganate Chemical compound [K+].[O-][Mn](=O)(=O)=O VZJVWSHVAAUDKD-UHFFFAOYSA-N 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 230000003287 optical Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 239000012085 test solution Substances 0.000 description 2
- 240000002840 Allium cepa Species 0.000 description 1
- 241000207199 Citrus Species 0.000 description 1
- 241000287828 Gallus gallus Species 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 235000020971 citrus fruits Nutrition 0.000 description 1
- 230000000875 corresponding Effects 0.000 description 1
- 235000002732 oignon Nutrition 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 229910052700 potassium Inorganic materials 0.000 description 1
- 239000011591 potassium Substances 0.000 description 1
- 239000011541 reaction mixture Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000012047 saturated solution Substances 0.000 description 1
- 239000011780 sodium chloride Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000012086 standard solution Substances 0.000 description 1
- 238000004448 titration Methods 0.000 description 1
Description
Известен енособ количественного определени лимонной киелоты, оеноваииый на реакции окислени ее в пентабромацетои. Согласно этому снособу пентабромацетон извлекают нз реакционной смеси нутем трехкратной экстракции хлороформом с носледующей отгонкой , высушивают до носто нного веса, взвеН1нвают и пересчитывают на содержание лимонной киелоты.A known method for quantitative determination of citric kielota, which is based on its oxidation reaction in pentabromoacetoi. In accordance with this procedure, pentabromoacetone is extracted from the reaction mixture by chickens extracted three times with chloroform and then distilled off, dried to a sufficient weight, weighed and converted to the content of citrus juice.
Цель изобретени - уекорить процесс н повысигь точность определени . Достигаетс это тем, что по нредложенному способу ведут однократную экстракцию пентабромацетона онределенным количеетвом хлороформа, после чего измер ют онтнчеекую нлотность экстракта в ультрафиолетовой области спектра при длине волны 305-310 ммк и толщине поглощающего сло 1 см.The purpose of the invention is to cope with the process and improve the accuracy of the determination. This is achieved by the fact that, according to the proposed method, a single extraction of pentabromoacetone with a defined amount of chloroform is carried out, after which the onion density of the extract is measured in the ultraviolet region of the spectrum at a wavelength of 305-310 mmk and an absorbing layer 1 cm thick.
Экстрагирование следует проводить однократно .Extraction should be carried out once.
П р н м е р. Нееколько миллилитров испытуемого раствора, содержан1,его около 70 мг кислот, определенных простым титрованием, помещают в делнтельиую воронку на 500 мл. Сюда же добавл ют серную кислоту, бромиетый калий н маргаицевокиелый калий дл окислени лимонной кислоты в пентабромацетон . Пзбыток марганцевокислого кали удал ют насыщенным раствором соли Мора. Образовавшийс нентабромацетон экетрагируют в течение 1 мин 50 мл очищенного хлороформа , отобранного л ерной колбой, причем вполне достаточно проводить однократную экстракцию нентабромацетона определеннымPREMIER A few milliliters of the test solution contained 1, about 70 mg of acids, determined by simple titration, are placed in a 500 ml funnel. Sulfuric acid, potassium bromide and N-potassium are added to oxidize citric acid to pentabromoacetone. A potassium permanganate excess was removed with a saturated solution of Mohr salt. The resulting nentabromoacetone is extracted for 1 min with 50 ml of purified chloroform selected by a laser flask, and it is quite sufficient to carry out a single extraction of nenabromoacetone with certain
количеетвом хлороформа. После одпократпой экстракции измер ют оптическую плотность отфильтрова)1ного хлороформного раствора па еиектрофотомстре при длине волны 305 - 310 и толщине поглощающего сло 1 см.the amount of chloroform. After a single extraction, the optical density of the filter of 1% chloroform solution was measured on an electrophotometer at a wavelength of 305 - 310 and the thickness of the absorbing layer was 1 cm.
Между концентрацией лимонной кислоты и оптической плотностью нентабромацетона существует нр молннейна зависимость, поэтому содержание лимонной кислоты в испытуемом раетворе уетанавливают по калибровочлой кривой, поетроениой при обработке вышеописанным способом соответствующей порции стандартного раствора лимонной кислоты.There is a lightning dependence between the concentration of citric acid and optical density of nentabromoacetone, therefore the content of citric acid in the test solution is calibrated using a calibrated curve, minimizing the corresponding portion of a standard solution of citric acid as described above.
Предмет изобретени Subject invention
2020
1. Сноеоб количественного определени лимонной кислоты, содержащейс в раетворе, путел окислени ее до пентабромацетона с1. An analysis of the quantitative determination of citric acid contained in a fire, caused its oxidation to pentabromoacetone from
дальнейщпм экстрагированием его хлороформом , отличающийс тем, что, с целью повышени точности определени и сокращени нродолжительности нроцесса, носле экстрагированн измер ют онтнчеекую плотность полу3 стн спектра при длине волны 305-310 ммк.и толщине поглощающего сло 1 см. 4 2. Способ по и. 1, отличающийс тем, что экстрагирование производ т однократно.further extracting it with chloroform, characterized in that, in order to improve the accuracy of determining and reducing the duration of the process, the energy density of half a spectrum of the spectrum at a wavelength of 305-310 mm and an absorbing layer thickness of 1 cm is extracted. 4 2. The method and . 1, characterized in that the extraction is performed once.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU192194A1 true SU192194A1 (en) |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6048732A (en) * | 1996-10-16 | 2000-04-11 | Board Of Regents, The University Of Texas System | Receptor and method for citrate determination |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6048732A (en) * | 1996-10-16 | 2000-04-11 | Board Of Regents, The University Of Texas System | Receptor and method for citrate determination |
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