Computer-controlled atomic absorption spectrometer for measurement of transient atom populations

Aldous, Kenneth M.; Mitchell, Douglas G.; Ryan, F. J.

doi:10.1021/ac60334a009

Cited by 22 publications

(15 citation statements)

References 4 publications

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“…The instrumental system has been described in a previous communication from this laboratory (2). Briefly, it comprises a single-beam atomic-absorption spectrometer built from a hollow cathode lamp with dc power supply, burner-Delves cup injector, f/3.5 monochromator, photomultiplier, photon counter, interface, and computer.…”

Section: Instrumentationmentioning

confidence: 99%

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Determination of lead in potable waters using a Delves cup atomic-absorption spectrometer with signal integration

Maines¹,

Aldous²,

Mitchell³

1975

Environ. Sci. Technol.

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Section: Instrumentationmentioning

confidence: 99%

“…Peak absorbance values are also measured and printed out. The measurement of integrated absorbance allows unmatched cups to be used without any loss in precision (2).…”

Section: Instrumentationmentioning

confidence: 99%

Determination of lead in potable waters using a Delves cup atomic-absorption spectrometer with signal integration

Maines¹,

Aldous²,

Mitchell³

1975

Environ. Sci. Technol.

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“…The instrumental system has been described in a previous communication from this laboratory (2). Briefly, it comprises a single-beam atomic absorption spectrometer built up from a hollow cathode lamp with dc power supply, a burner-Delves cup injector, an f/3.5 monochromator, a photomultiplier, a photon counter, an interface, and a computer.…”

Section: Instrumentationmentioning

confidence: 99%

Lead Content of Foodstuffs

Mitchell¹,

Aldous²

1974

Environ Health Perspect

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The lead content of a number of foodstuffs, particularly baby fruit juices and milk, is reported. Samples were analyzed in quadruplicate by using an automated Delves cup atomic absorption procedure. A large proportion of the products examined contained significant amounts of lead. Of 256 metal cans examined, the contents of 62% contained a lead level of 100 jug/l. or more, 37% contained 200 Ag/l. or more and 12% contained 400 ,ug/l. lead or more. Of products in glass and aluminum containers, only 1% had lead levels in excess of 200 gg/L Lead levels of contents also correlate with the seam length/volume ratio of the leaded seam can. A survey of bulk milk showed a mean lead level of 40 ug/L for 270 samples; for canned evaporated milk the mean level was 202 ,g/l. These data indicate a potential health hazard.

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“…A precision analog integrator was also developed for obtaining peak areas of transient type signals. This module was necessary because the microsampling cup method has been reported to be susceptible to analyte vaporization rate interferences relating to the sample matrix or physical differences between sample cups (17). These problems are most often encountered when an air-acetylene flame is used (18).…”

mentioning

confidence: 99%

“…These problems are most often encountered when an air-acetylene flame is used (18). By measuring peak areas, these vaporization rate interferences can often be effectively eliminated, linear dynamic ranges increased, and matrix matching of standards made easier (17)(18)(19). The relative merits of peak height or peak area measurements, however, depend on a number of sample and instrument variables and both elicit important information about the measurement system.…”

mentioning

confidence: 99%