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2004•Trace Elements ScienceRequires access

Study on the Spectrophotometric Determination of Trace Rare Earths in Human Hair with 4,6-dibromo-arsenazo

Xuesong Chen

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Abstract

The color reaction of 4,6-dibromo-arsenazo with rare earths has been studied.The experimental results show that RE 3+ reacts with 4,6-dibromo-arsenazo to form a stable purplish red complex(1∶2)in the chloracetic acid-sodium bydroxide buffer solution at pH 1.8 with an apparent molar absorptivity of e=1.2×10 5 at 640 nm.Beer's law was obeyed in the range of 0～2 μg/mL for rare earths.The method has been applied satisfactorily to the determination of 0.0005%～0.0050% rare earths in humane hair.

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What this paper is about

The color reaction of 4,6-dibromo-arsenazo with rare earths has been studied.The experimental results show that RE 3+ reacts with 4,6-dibromo-arsenazo to form a stable purplish red complex(1∶2)in the chloracetic acid-sodium bydroxide buffer solution at pH 1.8 with an apparent molar absorptivity of e=1.2×10 5 at 640 nm.Beer's law was obeyed in the range of 0～2 μg/mL for rare earths.The method has been applied satisfactorily to the determination of 0.0005%～0.0050% rare earths in humane hair.

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Available abstract

The color reaction of 4,6-dibromo-arsenazo with rare earths has been studied.The experimental results show that RE 3+ reacts with 4,6-dibromo-arsenazo to form a stable purplish red complex(1∶2)in the chloracetic acid-sodium bydroxide buffer solution at pH 1.8 with an apparent molar absorptivity of e=1.2×10 5 at 640 nm.Beer's law was obeyed in the range of 0～2 μg/mL for rare earths.The method has been applied satisfactorily to the determination of 0.0005%～0.0050% rare earths in humane hair.

Key concepts: Molar absorptivity, Chemistry, Color reaction, Spectrophotometry, Buffer solution, Sodium, Rare earth, Nuclear chemistry

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