Closed-Ampule Digestion Procedure for the Determination of Mercury in Soil and Tissue Using Cold Vapor Atomic Fluorescence Spectrometry

Rd, Jones; West-Thomas, J.; Arfstrom, C.

doi:10.1007/s001289900439

Cited by 12 publications

(2 citation statements)

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“…Incomplete digestion is also improbable. Acids used in this effort were stronger and the time the sample was held at high temperature was longer than previous similar studies (Van Delft, et al, 1988;Horvat, et al, 1991;Jones, et al, 1997).…”

Section: Following Optimization and Thermal Decompositionmentioning

confidence: 77%

“…However, because the tube's capped seal is not hermetic, volatilization losses Mean Difference = 1.454 Standard Error = 0.542 t-Ratio = 2.681 P-value = 0.013 also may have occurred during the overnight 90°C digestion. In other efforts, researchers were able to improve results by digesting samples in sealed vessels (Van Delft, et al, 1988;Horvat, et al, 1991;Jones, et al, 1997). However, for this work, the benefits from use of a sealed digestion vessel (e.g., a Pyrex ampoule) were viewed as unnecessary.…”

Section: Following Optimization and Thermal Decompositionmentioning

confidence: 97%

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Fate and transport of mercury in portland cement manufacturing facilities

Sikkema

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The USEPA's 2010 mercury rule, which would reduce emissions from non-hazardous waste burning cement manufacturing facilities by 94%, represents a substantial regulatory challenge for the industry (USEPA, 2010b). These regulations, based on the performance of facilities that benefit from low-levels of mercury in their feedstock and fuel inputs, will require non-compliant facilities to develop innovative controls. Development of these controls is difficult due to widely varying levels of mercury inputs and transient emissions caused by a poorly understood mechanism of mercury loop concentration. At present, a number of mercury control technologies are proposed; however, their effectiveness is limited by knowledge gaps. To achieve the USEPA's aggressive regulation with minimal harm to the industry, further research and data collection are required along with the development and assessment of control technologies. This review is subsequently intended to identify research and data gaps which might guide future efforts.

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Section: Following Optimization and Thermal Decompositionmentioning

confidence: 77%

Section: Following Optimization and Thermal Decompositionmentioning

confidence: 97%

Fate and transport of mercury in portland cement manufacturing facilities

Sikkema

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Mercury Analysis in Environmental Samples by Cold Vapor Techniques

Anderson

2000

Encyclopedia of Analytical Chemistry

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The accurate, precise, and automated determination of mercury in biological and environmental samples is complex, not only because of the various oxidation states of mercury (i.e. 0, I and II), but also because of biotic and abiotic methylation and the volatility of several forms of mercury(I and II). Mercury is unique among the metals because of its large vapor pressure at ambient conditions. Mercuric ions in solution can be reduced by tin(II), or sodium borohydride to produce volatile elemental mercury, referred to as the cold vapor process. The mercury is swept out of solution with a carrier gas (in the gas of sodium borohydride, the byproduct is hydrogen) into the cell (or torch) where the atomic absorption (or fluorescence, or emission) is measured. The cold vapor technique removes the mercury from the sample matrix, concentrates the mercury in the analytical sample into a small plug of carrier gas, and provides for a relatively long residence time. Detection limits vary depending on the instrument but are in the submicrogram to nanogram per liter range for atomic absorption spectrometry (AAS), atomic fluorescence spectrometry (AFS), and inductively coupled plasma atomic emission spectrometry (ICPAES).

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