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首页> 外文期刊>Radiochimica Acta: International Journal for Chemical Aspects of Nuclear Science and Technology >Study on the identification of organic and common anions in the pyrohydrolysis distillate of mixed uranium-plutonium carbide for the interference free determination of chlorine and fluorine by ion chromatography
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Study on the identification of organic and common anions in the pyrohydrolysis distillate of mixed uranium-plutonium carbide for the interference free determination of chlorine and fluorine by ion chromatography

机译：铀-碳化carbide混合热解馏分中有机和常见阴离子的鉴定用于离子色谱法无干扰测定氯和氟的研究

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摘要

Identification of various soluble organic acids formed during the pyrohydrolysis of uranium-plutonium mixed carbide [(U, Pu) C] was carried out using ion chromatography. This has significant importance as the soluble organic acids can cause severe interferences during the ion chromatography separation and determination of Cl~- and F~- in the pyrohydrolysis distillate of (U, Pu) C. Determination of Cl and F is important in the chemical quality control of nuclear materials as these two elements can cause corrosion and hence, their concentrations in all nuclear materials are restricted to certain specified values. Since the pyrohydrolysis distillates contain both inorganic and organic acid anions, for the sake of separating and identifying organic acid anions from the common inorganic anions, three independent isocratic elutions using varying concentrations of NaOH eluent were employed for the separation of weakly, moderately and strongly retained anions. It was observed that pyrohydrolysis of (U, Pu) C also produced soluble organic acids as in the case of nitric acid dissolution of UC. The present investigation revealed the presence of formic, acetic, propionic, butyric, oxalic acid anions in the pyrohydrolysis distillate of (U, Pu) C in trace or ultra-trace concentrations. The presence of each organic acid identified in the chromatogram was confirmed with spike addition as well as by separating them by capillary electrophoresis method. The presence of lower aliphatic acids viz. formic and acetic acids was reconfirmed by carrying out an independent separation with tetraborate eluent. It is suggested that nitric acid being formed during pyrohydrolysis could be responsible for the formation of organic acids. Based on the findings, an ion chromatography separation method has been proposed for the interference-free determination of chloride and fluoride in pyrohydrolysis distillate of (U, Pu) C.
机译：使用离子色谱法对铀-p混合碳化物[（U，Pu）C]进行热水解过程中形成的各种可溶性有机酸的鉴定。这一点非常重要，因为可溶性有机酸会在离子色谱分离和测定（U，Pu）C的热水解馏出物中Cl〜-和F〜-的过程中引起严重的干扰。Cl和F的测定在化学中很重要核材料的质量控制，因为这两个元素会引起腐蚀，因此，它们在所有核材料中的浓度都限制在某些特定值内。由于热解馏出液中既含有无机阴离子又含有有机酸阴离子，为了从常见的无机阴离子中分离和鉴定有机酸阴离子，使用了三种不同浓度的NaOH洗脱液进行独立的等度洗脱，以分离弱，中和强保留的阴离子。观察到（U，Pu）C的热水解也产生可溶性有机酸，就像在硝酸溶解UC的情况下一样。本研究表明，痕量或超痕量浓度的（U，Pu）C的热水解馏出物中均存在甲酸，乙酸，丙酸，丁酸，草酸阴离子。通过加标峰以及通过毛细管电泳法分离它们，确认了色谱图中鉴定出的每种有机酸的存在。低级脂肪酸的存在。通过用四硼酸盐洗脱液进行独立分离，再次确认了甲酸和乙酸。建议在热水解过程中形成硝酸可能是有机酸形成的原因。基于这些发现，提出了一种离子色谱分离方法，用于无干扰地测定（U，Pu）C的热水解馏出物中的氯化物和氟化物。

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