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Modified electrical heating system for hydride generation atomic absorption spectrometry and elaboration of a digestion method for the determination of arsenic and selenium in biological materials

✍ Scribed by Daniel Mayer; Sabine Haubenwallner; Walter Kosmus; Wolfgang Beyer

Publisher
Elsevier Science
Year
1992
Tongue
English
Weight
667 KB
Volume
268
Category
Article
ISSN
0003-2670

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✦ Synopsis

A modified electrical heating system for hydnde generation atomic absorption spectrometIy has been deslgned

The heating block permds a rapld and convement change of the quartz tube m order to clean and condition its surface Frequent condltlomng guarantees high and constant measurement sensltlvlty Further, an mexpenslve and simple microwave digestion procedure has been developed The methods were tested by analysmg reference matenals and proved to be appropnate for trace concentrations of arsemc and selemum

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A simple and rapid hydride generationβ€”at
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An inexpensive 50-ml disposable (hypodermic) syringe is used as the arsine generation vessel. The arsine is passed into a lo-cm long. lo-mm i.d. electrically heated silica tube atomizer with nitrogen carrier gas. Jkcess of hydrogen is burned off in a hydrogen diffusion flame at the ends of the tube.

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The increasing concern over human exposure to arsenic in West Bengal and Bangladesh has necessitated the development of a rapid method for determination of trace levels of arsenic in water and biological samples. We have developed a simple indigenous flow injection hydride generation atomic absorpti