SU821407A1 - Method of spectrophotometric determination of rare-earth elements - Google Patents

Method of spectrophotometric determination of rare-earth elements Download PDF

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Publication number
SU821407A1
SU821407A1 SU792739118A SU2739118A SU821407A1 SU 821407 A1 SU821407 A1 SU 821407A1 SU 792739118 A SU792739118 A SU 792739118A SU 2739118 A SU2739118 A SU 2739118A SU 821407 A1 SU821407 A1 SU 821407A1
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SU
USSR - Soviet Union
Prior art keywords
earth elements
rare
spectrophotometric determination
increase
nickel
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SU792739118A
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Russian (ru)
Inventor
Павел Капитонович Спицын
Ольга Владимировна Готсданкер
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Предприятие П/Я Р-6409
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Priority to SU792739118A priority Critical patent/SU821407A1/en
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Publication of SU821407A1 publication Critical patent/SU821407A1/en

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  • Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)

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Изобретение относитс  к аналитическо химии, .преимущественно к спектрофотоме трическим методам, и может быть .использовано при количест енном определении редкоземельных элементов (РЗЭ) в сплавах на основе железа, никел , хрома , алюми1 и . Известен способ фотометрического определени  .цери  по реакции с арсеназо (iLl) при рН 2,0 в жаропрочных сплавах, включающий двухкратное хромат графическое отделение, цери  от мешающ элементов fl. Известен также способ, в котором вли ние компонентов сплава устран ют путем осаждени  цери  в виде фторида совместно с фторидом кальци  и измер ют светопоглощенио сульфата четырехвалентного цери  23. Недостатком этих способов  вл етс  низка  чувствительность- и избирательность , вследствие чего приходитс  вы полн ть дополнительные технологические операции по отделению и концентрирова- нию цери . При этом возможны потериРЗЭ , что снижает надежность анализа. Наиболее близким к изобретению по технической сущности и достигаемому результату  вл етс  способ спектрофотометрического определени  редкоземельных элементов; в молибдене и никельмолибденовых сплавах, включающий их в комплексное соединение с органическим реагентом - арсеназо (1Н) в присутствии молибдат-ионов, которые ввод т в виде молибденовокислого аммони . Перевод РЗЭ в комплексное соединение осуществл ют при рН 3,8 - 4,O.C3j Однако известный способ не позвол ет определить РЗЭ с достаточной чувствитвпь ностью при анализе сплавов на основе железа, никел , хрома алюмини . Цель изббретени  - повышение чувствительности определени  РЗЭ при анализе сплавов на основе железа, никел , хрома, алюмини . Поставленна  цель достигаетс  тем, что согласно способу спектрофотометраThe invention relates to analytical chemistry, mainly to spectrophotometric methods, and can be used in the quantitative determination of rare earth elements (REE) in alloys based on iron, nickel, chromium, aluminum and. A known method of photometric determination of cerium by reaction with arsenazo (iLl) at pH 2.0 in high-temperature alloys, comprising a two-fold chromatic graphical separation of cerium from interfering elements fl. There is also known a method in which the influence of alloy components is eliminated by precipitating cerium in the form of fluoride together with calcium fluoride and measuring the light absorption of tetravalent cerium sulfate 23. The disadvantage of these methods is low sensitivity and selectivity, as a result of which additional technological operations for separation and concentration of cerium. At the same time, loss of SFS is possible, which reduces the reliability of the analysis. The closest to the invention in technical essence and the achieved result is the method of spectrophotometric determination of rare-earth elements; in molybdenum and nickel molybdenum alloys, including them in a complex compound with an organic reagent - arsenazo (1H) in the presence of molybdate ions, which are introduced in the form of ammonium molybdate. Conversion of REE into a complex compound is carried out at pH 3.8 - 4, O.C3j However, the known method does not allow determination of REE with sufficient sensitivity in analyzing alloys based on iron, nickel, chromium-aluminum. The goal of avoidance is to increase the sensitivity of the determination of REE in the analysis of alloys based on iron, nickel, chromium, aluminum. The goal is achieved by the fact that according to the spectrophotometer method

Claims (2)

Формула изобретенияClaim 1. Способ спектрофотометрического определения редкоземельных элементов,1. The method of spectrophotometric determination of rare earth elements, 15 включающий перевод их в комплексное соединение с органическим реагентомарсеназо (Ш) в присутствии модибдатионов, отличающийся тем, что, с целью повышения чувствительности 20 определения при анализе сплавов на основе железа, никеля, хрома, алюминия, мрлибдат-ионы вводят в раствор в виде натриевой соли в количестве 50-100 г/л.15 including their conversion to a complex compound with an organic reagent arsenazo (III) in the presence of modibdation, characterized in that, in order to increase the sensitivity, 20 determinations in the analysis of alloys based on iron, nickel, chromium, aluminum, mrlibdate ions are introduced into the solution in the form of sodium salt in an amount of 50-100 g / l. 2. Способ по π. 1, отличаю- 25 ш и й с я тем, что, с целью повышения стабильности результатов анализа, раствор молибденовокислого натрия предварительно нейтрализуют до pH 7,0-7,7 и добавляют к. анализируемому раствору зо с pH 0,45-0,55.2. The method according to π. 1, differing w and 25 minutes with the I that, in order to increase the stability of the analysis results, sodium molybdate solution previously neutralized to pH 7,0-7,7 and added to. The assay solution with zo pH 0,45-0, 55.
SU792739118A 1979-03-22 1979-03-22 Method of spectrophotometric determination of rare-earth elements SU821407A1 (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
SU792739118A SU821407A1 (en) 1979-03-22 1979-03-22 Method of spectrophotometric determination of rare-earth elements

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