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Spectrophotometric Determination of Neodymium in Magnesium Alloy with Chlorophosphonazo mA

Zhu Zhi, Jin Xiaocheng, Xiaomin Xue, Fei Han, Che Wu-heng

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Abstract

Contrast tests, for four kinds of chromogenic agent and five kinds of acid media, were conducted for rapid determination of Nd content in ZM6. It was found that the chromogenic reaction for Nd with chlorophosphonazo mA in medium of 0.1 mol·L-1 HCl was of good selectivity and high sensitivity. The maximum absorption of the complex is at 670 nm, the apparent molar absorption coefficient is 9.81×104 L·mol-1·cm-1, and the Beer's law is obeyed in the range of 0-40 μg/25 mL for Nd. Therefore the best condition was found to determine Nd content in magnesium alloy. Comparing with oxalate gravimetric method by testing 8 samples, the result is satisfactory. The method is rapid and accurate in determination of Nd for large quantities of magnesium alloy. It can also be widely used in determination of other single light rare earth element in magnesium alloy.

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What this paper is about

Contrast tests, for four kinds of chromogenic agent and five kinds of acid media, were conducted for rapid determination of Nd content in ZM6. It was found that the chromogenic reaction for Nd with chlorophosphonazo mA in medium of 0.1 mol·L-1 HCl was of good selectivity and high sensitivity. The maximum absorption of the complex is at 670 nm, the apparent molar absorption coefficient is 9.81×104 L·mol-1·cm-1, and the Beer's law is obeyed in the range of 0-40 μg/25 mL for Nd. Therefore the best condition was found to determine Nd content in magnesium alloy. Comparing with oxalate gravimetric method by testing 8 samples, the result is satisfactory. The method is rapid and accurate in determination of Nd for large quantities of magnesium alloy. It can also be widely used in determination of other single light rare earth element in magnesium alloy.

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Available abstract

Contrast tests, for four kinds of chromogenic agent and five kinds of acid media, were conducted for rapid determination of Nd content in ZM6. It was found that the chromogenic reaction for Nd with chlorophosphonazo mA in medium of 0.1 mol·L-1 HCl was of good selectivity and high sensitivity. The maximum absorption of the complex is at 670 nm, the apparent molar absorption coefficient is 9.81×104 L·mol-1·cm-1, and the Beer's law is obeyed in the range of 0-40 μg/25 mL for Nd. Therefore the best condition was found to determine Nd content in magnesium alloy. Comparing with oxalate gravimetric method by testing 8 samples, the result is satisfactory. The method is rapid and accurate in determination of Nd for large quantities of magnesium alloy. It can also be widely used in determination of other single light rare earth element in magnesium alloy.

Key concepts: Chromogenic, Neodymium, Magnesium, Chemistry, Gravimetric analysis, Alloy, Spectrophotometry, Oxalate

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