SU574393A2 - Kinetic method of determining chromium (vi) - Google Patents
Kinetic method of determining chromium (vi)Info
- Publication number
- SU574393A2 SU574393A2 SU7602334638A SU2334638A SU574393A2 SU 574393 A2 SU574393 A2 SU 574393A2 SU 7602334638 A SU7602334638 A SU 7602334638A SU 2334638 A SU2334638 A SU 2334638A SU 574393 A2 SU574393 A2 SU 574393A2
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- chromium
- solution
- kinetic method
- acid
- determining chromium
- Prior art date
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- Investigating Or Analysing Materials By The Use Of Chemical Reactions (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
Description
33
том в данной системе, способным окисл ть хромотроповую кислоту, вл етс соединение I.The volume in this system capable of oxidizing chromotropic acid is compound I.
Изучено вли ние других реагентов, дающих нри окислении окрашенные продукты реакции: аш - кислота (1-амино-8-нафтол-3,6-дисульфокислота ) и вариаминовый голубой. Однако auj - кислота не окисл етс соединением I, а вариаминовый голубой восстанавливает Сг (VI) до неактивного Сг (III), и каталитическа реакци ирекрагцаетс .The effect of other reagents giving oxidation to the colored reaction products was studied: Al - acid (1-amino-8-naphthol-3,6-disulfonic acid) and variamine blue. However, auj — the acid is not oxidized by compound I, and the variamine blue restores Cr (VI) to inactive Cg (III), and the catalytic reaction ceases.
Таким образом, хромотропова кислота не окисл етс броматом и хромом (VI), окисл етс продуктом окислени метурнна и образует нри этом окрашенные продукты реакцнн. Оптическа плотпость растворов пропорциональна концентрации нродуктов окнсленн метурпна, что нозвол ет онредел ть содержапне хрома но калибровочному графику.Thus, chromotropic acid is not oxidized by bromate and chromium (VI), oxidized by the oxidation product meturn and forms colored reaction products. The optical density of the solutions is proportional to the concentration of the products of the oxidized meturpane, which makes it possible to determine the content of the chromium in a calibration graph.
Пример. Определение хрома в барии азотнокислом.Example. Determination of chromium in barium nitrate.
Навеску 0,200 г бари азотнокислого раствор ют в 2 мл воды, добавл ют 1 мл 0,2 н. раствора азотной кислоты и 0,1 мл иасын,епного раствора бромата калн . Пробирку помешкают в стакан с кип щей водой на 30 мин. По охлаждении довод т объем раствора водой до 3,0 мл, добавл ют 1,5 мл 0,2 н. раствора азотной кислоты и 0,1 мл раствора бро4A weighed portion of 0.200 g of barium nitrate was dissolved in 2 ml of water, 1 ml of 0.2 N was added. a solution of nitric acid and 0.1 ml Iasin, a solution of bromate, Kaln. The tube is stirred in a glass of boiling water for 30 minutes. After cooling, the solution was brought to a volume of 3.0 ml with water; 1.5 ml of 0.2 N was added. solution of nitric acid and 0.1 ml of bro4 solution
мата калн . Затем добавл ют 0,2 мл 0,1 /оного раствора метурнна и 0,2 мл 0,05%-пого раствора хромотроповой кислоты. Пробирку iroMenunioT в стакан с кин щей водой па 10 мин, охлаждают, переливают в стекл пную кювету с толщиной поглощающего сло ,0 см и измер ют величину оптической нлотностн раствора па фотоколориметре ФЭК-56, иснользу светофнльтр № 4 ( 434 нм).Mata Kaln. Then 0.2 ml of a 0.1% solution of meturn and 0.2 ml of a 0.05% solution of chromotropic acid are added. Test tube iroMenunioT in a glass with cinch water for 10 min, cool, pour into a glass cuvette with an absorbing layer thickness of 0 cm and measure the optical density value of the PA solution by FEC-56 photocolorimeter, using light No. 4 (434 nm).
Рассчитывают содержание хрома в барии азотнокислом, учитыва велпчину контрольного оныта (без барп азотнокпслого). Проаналнзированиые образцы барп азотнокислого квалифнкацнн «хч содержат , хрома.Calculate the chromium content in the barium nitrate, taking into account the quantity of the control onyta (without the barop nitrate). Proanalized samples of barp of nitrate qualification hch contain chromium.
Аналогнчным образом можно онредел ть содержаннс хрома в других реактивах и веществах особой чистоты. При той же чувствительности н нзбиратсльпости точность определени иовьинаетс в 2 раза.Similarly, chromium can be determined in other chemicals and substances of high purity. With the same sensitivity as the accuracy, the accuracy of determination is twofold.
Ф о р м у л а и 3 о б р с т е н и Ф орм ул а and 3 о б с с і н and
Кинетический способ определени хрома (VI) по авт. св. N° 217681, отличающийс тем, что, с целью упрощенн анализа и повыщеии точности, к раствору, содержащему продукт окислени метурина броматом кали добавл ют хромотроповую кислоту.The kinetic method for the determination of chromium (VI) by the author. St. N ° 217681, characterized in that, for the purpose of simplified analysis and increased accuracy, chromotropic acid is added to the solution containing the oxidation product of meturin by potassium bromate.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU7602334638A SU574393A2 (en) | 1976-03-18 | 1976-03-18 | Kinetic method of determining chromium (vi) |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SU7602334638A SU574393A2 (en) | 1976-03-18 | 1976-03-18 | Kinetic method of determining chromium (vi) |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU217681 Addition |
Publications (1)
Publication Number | Publication Date |
---|---|
SU574393A2 true SU574393A2 (en) | 1977-09-30 |
Family
ID=20652333
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
SU7602334638A SU574393A2 (en) | 1976-03-18 | 1976-03-18 | Kinetic method of determining chromium (vi) |
Country Status (1)
Country | Link |
---|---|
SU (1) | SU574393A2 (en) |
-
1976
- 1976-03-18 SU SU7602334638A patent/SU574393A2/en active
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