SU185104A1 - METHOD FOR DETERMINING AMMONIUM (GENERAL) NITROGEN IN AGROCHEMICAL MATERIALS - Google Patents
METHOD FOR DETERMINING AMMONIUM (GENERAL) NITROGEN IN AGROCHEMICAL MATERIALSInfo
- Publication number
- SU185104A1 SU185104A1 SU949040A SU949040A SU185104A1 SU 185104 A1 SU185104 A1 SU 185104A1 SU 949040 A SU949040 A SU 949040A SU 949040 A SU949040 A SU 949040A SU 185104 A1 SU185104 A1 SU 185104A1
- Authority
- SU
- USSR - Soviet Union
- Prior art keywords
- nitrogen
- ammonium
- general
- solution
- determining
- Prior art date
Links
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title description 14
- 229910052757 nitrogen Inorganic materials 0.000 title description 6
- QGZKDVFQNNGYKY-UHFFFAOYSA-O ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 title description 4
- 239000000463 material Substances 0.000 title description 4
- 239000003905 agrochemical Substances 0.000 title description 2
- JGJLWPGRMCADHB-UHFFFAOYSA-N Hypobromite Chemical compound Br[O-] JGJLWPGRMCADHB-UHFFFAOYSA-N 0.000 description 8
- 239000000243 solution Substances 0.000 description 8
- -1 ammonium ions Chemical class 0.000 description 7
- HEMHJVSKTPXQMS-UHFFFAOYSA-M sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 6
- 238000004448 titration Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 5
- 239000003153 chemical reaction reagent Substances 0.000 description 4
- 239000000284 extract Substances 0.000 description 4
- CEQFOVLGLXCDCX-WUKNDPDISA-N Methyl red Chemical compound C1=CC(N(C)C)=CC=C1\N=N\C1=CC=CC=C1C(O)=O CEQFOVLGLXCDCX-WUKNDPDISA-N 0.000 description 3
- VLTRZXGMWDSKGL-UHFFFAOYSA-N Perchloric acid Chemical compound OCl(=O)(=O)=O VLTRZXGMWDSKGL-UHFFFAOYSA-N 0.000 description 3
- NLKNQRATVPKPDG-UHFFFAOYSA-M Potassium iodide Chemical compound [K+].[I-] NLKNQRATVPKPDG-UHFFFAOYSA-M 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 238000006479 redox reaction Methods 0.000 description 3
- JHJLBTNAGRQEKS-UHFFFAOYSA-M Sodium bromide Chemical compound [Na+].[Br-] JHJLBTNAGRQEKS-UHFFFAOYSA-M 0.000 description 2
- 125000001246 bromo group Chemical group Br* 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- KEAYESYHFKHZAL-UHFFFAOYSA-N sodium Chemical compound [Na] KEAYESYHFKHZAL-UHFFFAOYSA-N 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 229910052708 sodium Inorganic materials 0.000 description 2
- 235000011121 sodium hydroxide Nutrition 0.000 description 2
- NYCVSSWORUBFET-UHFFFAOYSA-M sodium;bromite Chemical compound [Na+].[O-]Br=O NYCVSSWORUBFET-UHFFFAOYSA-M 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229920002472 Starch Polymers 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000002378 acidificating Effects 0.000 description 1
- 239000007853 buffer solution Substances 0.000 description 1
- 239000003518 caustics Substances 0.000 description 1
- 125000001309 chloro group Chemical class Cl* 0.000 description 1
- 230000001809 detectable Effects 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- PNDPGZBMCMUPRI-UHFFFAOYSA-N iodine Chemical compound II PNDPGZBMCMUPRI-UHFFFAOYSA-N 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000003472 neutralizing Effects 0.000 description 1
- 229940075581 sodium bromide Drugs 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 235000019698 starch Nutrition 0.000 description 1
- 239000008107 starch Substances 0.000 description 1
- NINIDFKCEFEMDL-UHFFFAOYSA-N sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
Description
Известен способ определеии алимониршого (общего) азота в растительиых материалах, ири котором аиализируемые образцы сжигают смесью серией и хлориой кислот. Полученные выт жки иейтрализуют едким натром в присутствии метилового красного. Далее добавл ют с избытком гииобромит иатри . При этом лишь часть реактива расходуетс на окисление аммони . Остаток реактива, не вошедший в реакиию, восстанавливают ири помош ,и йодистого кали . Выдел ющийс йод оттитровывают в нрисутствии крахмала. Зна количество гииобромита, добавленного к исследуемой выт жке, и определив йодометрически количество оставшегос и не вошедшего в реакиию гииобромита, определ ют по разности расход реактива на окисление ионов аммоии .There is a known method for the determination of alimonir (total) nitrogen in plant materials, and which samples being burned are burned with a mixture by a series and chlorine acids. The resulting extracts are neutralized with caustic soda in the presence of methyl red. Next is added with an excess of giobromite and sodium. However, only a portion of the reagent is consumed for the oxidation of ammonium. The residue of the reagent, which was not included in the reaction, is reduced by iri pomosh and potassium iodide. Released iodine is titrated in the presence of starch. By knowing the amount of giobromite added to the test hood, and determining iodometrically the amount of residual giobromite not included in the reaction, the consumption of reagent for the oxidation of ammonium ions is determined by the difference.
Дл сокращени затрат труда и перевода аиалитических работ на поточную схему по иредложениому способу i-гоны аммони , содержащиес в исследуемой выт жке, титруют гипобрсмитом пр мым -пз-тем, прибавл его по капл м к выт жке, а :онец титровани определ ют электрометрически с ампорометрической индикацией конечной точки при помощи азотометра.In order to reduce labor costs and transfer analytical work to an on-line scheme, according to the proposed method, ammonium i-gons contained in the studied extract are titrated with hypo-smittum directly, added dropwise to the extract, and the titration is determined electrometrically with amporometric display of the end point using a nitrogen meter.
(N4I,) + 3NaBr+ О -f 2NOn -- N.. I + + 3NaBr- + NaoSOi-h ЬЬЮ(N4I,) + 3NaBr + O -f 2NOn - N .. I + + 3NaBr- + NaoSOi-h
Аиализируемые образцы сжигают смесью серной н хлорной кислот. 10 мл получеииой выт жки нейтрализуют едким иатром в присутствии метилового красного, добавл ют 10 Л1Л буферного раствора, 10 лгл 35/о-ного раствора бромистого натри и довод т объем жидкости S стакане путем прибавлени воды до 50 мл. Стакан помещают в гиездо азотометра , и состав титруют раствором гниоброMJiTa . В результате окислительно-восстанов)тельиой реакции образуютс молекул рный азот, бромит натри , сер)1скислый натрий и вода. В ходе титровани гипобромит полностью расходуетс на окислеиие ионов аммоип . Когда ионы аммони окислеиы до молекул рного азота, перва же )3быточиа капл гипобромита, введенна в стакаи с титруемым раствором, вызывает новую окислительно-восстановительную реакцию. Она протекает между положительно зар женными атомами брома, вход щими в молекулы гипобромита, и отрицательно зар женными атомами брома, вход щи.ми Б состав бромита натри . Пачало окислительно-восстановительной реакции между Вг и Вг регистрируют электрометрически на электроиио: 1 азотометре. Одиовремеино титруют контрольный раствор, содержащийCalibrated samples are burned with a mixture of sulfuric n perchloric acid. 10 ml of the obtained extract is neutralized with caustic acid and in the presence of methyl red, 10 L1L of the buffer solution is added, 10 mg of 35 / about sodium bromide solution and the volume of liquid S is added to the glass by adding water to 50 ml. The beaker is placed in a nitrogen meter gide, and the composition is titrated with a solution of ginioMJiTa. As a result of the oxidation-reduction reaction, molecular nitrogen, sodium bromite, sulfur) 1 acidic sodium and water are formed. During titration, hypobromite is completely consumed in the oxidation of ammonium ions. When ammonium ions are oxidized to molecular nitrogen, the first 3 drops of hypobromite introduced into the glass with the titrated solution causes a new redox reaction. It proceeds between the positively charged bromine atoms entering the molecules of hypobromite and the negatively charged bromine atoms that are included in the composition of sodium bromite. The rate of the redox reaction between Br and Br is recorded electrometrically at an electrio: 1 nitrogen gauge. Odiovremeino titrate the control solution containing
все реактивы, 1кроме определ емого аммонийного азота.all reagents, 1x the detectable ammonium nitrogen.
Содержание аммонийного азота определ ют по формуле:The content of ammonium nitrogen is determined by the formula:
X ,X,
с (1from (1
где X - содержание аммонийного азота , «/о;where X is the content of ammonium nitrogen, "/ o;
аий - объем раствора гипобромнта, пошедшего на титрованне, псследуемого или контрольного раствора , мл;aiy is the volume of a solution of hypobromnt, followed by titration, test or control solution, ml;
Т - титр раствора гинобромпта, выраженный в г аммонийного азота;T is the titer of a solution of ginobrompt, expressed in g of ammonium nitrogen;
V - конечный объем выт жки, мл;V is the final draw volume, ml;
с - назеска исследуемого материала , г;с — nazeska of the material under study, g;
d - объем 13151ТЯЖКИ, вз той дл титровани , мл.d is the volume of 13151 stretch taken for titration, ml.
Предмет нзобретени Subject matter
Способ определени аммонийного (общего) азота в агрохимических материалах, например растени х, почвах, включающий сжигание анализируемых образцов смесью серной и хлорной кислот, нейтрализацию иолученных выт жек едким натром в нрисутствии метилового красного и титрование, отличающийс:: тем, что, с целью сокращени затрат труда и перевода аналитических работ на поточную схему, титрованне провод т раствором гипобромита с электрометрической индикацией коица титровани .The method of determining ammonium (total) nitrogen in agrochemical materials, such as plants, soils, including burning the samples to be analyzed with a mixture of sulfuric and perchloric acids, neutralizing the resulting caustic soda in the presence of methyl red, and titrating different: in order to reduce labor costs and the transfer of analytical work to the flow scheme, titration is carried out with a solution of hypobromite with electrometric indication of titration.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU185104A1 true SU185104A1 (en) |
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