Abstract
تركيزات التربة النادرة لمقايسات Rosetta monazite تبلغ حوالي 44 و 23 و 16.94 و 5.91٪ لـ Ce و La و Nd و Pr على التوالي. فصل السيريوم عن طريق أكسدة الهواء عند 200 درجة مئوية. الفصل الانتقائي لـ Pr بواسطة D2EHPA عند pH1 متبوعًا بطريقة قياس طيف ضوئي حساسة والتي تم وصفها لتقدير البراسيوديميوم (Pr) مع l ، 4-dihydroxyanthraquinone. كان منحنى المعايرة خطيًا من 0.1 إلى 12 ميكروغرام -1 براسيوديميوم. تم دراسة تأثير العوامل المختلفة وظروف التفاعل لتحقيق أقصى تطور للون. الانحراف المعياري النسبي لتقدير 1 ميكروغرام -1 براسيوديميوم وجد أنه 1.3 بعد 5 قرارات متكررة ؛ نسبة الخطأ 5.02٪ ، الامتصاصية المولية (ε) كانت 1.23 × 106 م -1 سم وحد الكشف كان 0.1 ميكروغرام مل -1. أظهرت طريقة تقدير البراسيوديميوم دقة وانتقائية جيدة.
Highlights
Rare earth elements (REEs), represent one of a set of seventeen chemical elements in the periodic table, the fifteen lanthanides, as well as scandium and yttrium (Connelly, N.G., et al, 2005)
The purple colored Pr-(1,4-Dihydroxyanthraquinone)-methanol complex were prepared by add 4 ml of (1,4-diOH-AQ)solution, a sample solution of praseodymium ion (≤ 0.2 ml) by micropipette, 0.8 ml buffer solution, 5.0 ml of methanol, and complete up to volume in 10 ml volumetric flask using double distilled water, measure the absorbance of the complex formed in a 1cm cell against a reagent blank at 560 nm
It was shown from the Table (1) that the presence of light rare earth elements (LREEs) in the prepared monazite concentrate; lanthanum, cerium, praseodymium and neodymium about 90%, where a cerium alone assaying about 44.20%
Summary
Rare earth elements (REEs), represent one of a set of seventeen chemical elements in the periodic table, the fifteen lanthanides, as well as scandium and yttrium (Connelly, N.G., et al, 2005). Praseodymium is soft silvery metal used as an alloying agent with magnesium for the production of high strength metal alloys used in aircraft engines It forms the core of carbon arc lights for the motion picture industry and didymium glass to make certain types of welders and glass blowers goggles (with a yellow color). L,4-dihydroxyanthraquinone is a chromogenic and fluorogenic agent of metallic ions that shows high selectivity in its reactions since the O-donors are blocked by two strong intramolecular hydrogen bondings; few spectrophotometric methods using this reagent are known. This reagent has been applied for the determination of Mg 2+ and UO22+ (Gracia, L.G., et al, 1997). Optimum factors affecting formation of the complex such as maximum wavelength, pH, initial concentration of dye, molar ratios, effect of duration time, and calibration curve were investigated
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