Atomic absorption spectroscopy representative method

A method for sampling and analysis of the metallic dusts and fumes is necessary to assess the exposure of workers to these dusts. Personal sampling devices are used to collect samples from the work-place atmosphere in a representative manner. The samples are then analyzed by convenient analytical techniques such as atomic absorption spectroscopy. 

The potential/time profile for anodic stripping voltammetry and a typical experimental curve for the determination of a mixture of heavy metal ions is shown in Fig. 11.14. The method is clearly limited to the determination of metals which form simple amalgams (inter-metallic compounds must also be avoided). This limitation, however, introduces some desirable selectivity and most organic compounds will not interfere with the determination of the metals. Using acceptable deposition times, analysis of very low concentrations is possible. Certainly for heavy metal ions, the sensitivity of anodic stripping analyses compares well with that of atomic absorption spectroscopy even with non-flame atomization (see Table 11.4). Moreover, these data do not represent the ultimate detection limit since the plating time can be extended. 

Ion chromatography plays a very important role in hyphenated techniques used in species analysis. Coupling techniques represent the link of ion chromatography systems with an independent analytical detection method, usually spectroscopic (AAS-Atomic Absorption Spectroscopy, ICP-AES-lnductively Coupled Plasma Atomic Emission Spectroscopy, ICP-MS-Inductively Coupled Plasma-Mass Spectrometry ). 

Lead detection kits are useful as a quick check for screening areas for lead abatement. A positive response is evidence of the presence of lead or a positive interference. A negative response, however, is not conclusive evidence of the absence of lead. The test provides presumptive evidence for the presence of lead, not its absence. A more thorough determination may need to be performed by a quantitative laboratory analysis of any representative bulk material available to substantiate the absence of lead. Samples are analyzed for lead at OSHA s Salt Lake Technical Center (SLTC) using OSHA methods ID-121 with Atomic Absorption Spectroscopy (AAS), ID-125 G with Inductively Coupled Plasma (ICP), or ID-206 (Solders by ICP). If necessary, lower limits of detection for lead may be achieved using ICP Mass Spectrometer procedures. 

Sensing methods capable of quantifying these trace elements at low levels include atomic absorption spectroscopy (AAS), inductively coupled plasma (ICP) combined with atomic emission spectrometry (ICP-AES) or inductively coupled plasma with mass spectrometry (ICP-MS). The latter technique represents a powerful... 

Inner shell absorption spectroscopy provides a map of unoccupied electronic states (or levels) and the electronic structures of conduction bands in the vicinity of the core-excited atom. The X-ray absorption spectroscopy (XAS) represents a fingerprint of the chemical state of the element. It provides useful means of nondestructive site-dependent chemical analysis of complex systems. Ultra-soft X-ray absorption (USXA) method is categorically interesting for chemical analysis of a variety of complex materials in battery industry, environmental science, and semiconductor industry. 

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