Robert D. Stephens
California Health and Human Services Agency
31 Papers
532 Citations
Robert D. Stephens is an academic researcher from California Health and Human Services Agency. The author has contributed to research in topics: Mass spectrometry & Ion chromatography. The author has an hindex of 19, co-authored 31 publications. Previous affiliations of Robert D. Stephens include California Environmental Protection Agency.
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Papers
Workshop on perinatal exposure to dioxin-like compounds. I. Summary.
TL;DR: An international workshop reviewed 20 ongoing or recently completed studies of the effects of perinatal exposures to dioxins, dibenzofurans, and PCBs on the reproductive, endocrine, neurodevelopmen...
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Determination of chlorinated phenoxy acid and ester herbicides in soil and water by liquid chromatography particle beam mass spectrometry and ultraviolet absorption spectrophotometry
TL;DR: In this article, the authors used liquid chromatography with UV adsorption of quantitation and particle beam mass spectrometry for confirmation to determine chlorinated phenoxy acid and three ester herbicides.
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Foraging fram animals as biomonitors for dioxin contamination
Ruth R. Chang,Douglas G. Hayward,Lynn R. Goldman,Martha E. Harnly,Jennifer Flattery,Robert D. Stephens +5 more
- 01 Jan 1989
TL;DR: The authors found that low concentrations of dioxins and furans in soil can lead to bioaccumulation in chickens and cattle which are in contact with the soil, and these compounds were found to distribute into various tissues of the animals and into the eggs of the chickens.
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Determination of aromatic sulfonic acids in aqueous environmental samples by anion-exchange chromatography coupled to particle beam mass spectrometry and UV spectrophotometry
TL;DR: Aromatic sulfonic acids are determined in water using anion-exchange liquid chromatography as discussed by the authors, and the average recoveries are 82% for six monosulfonic acids (spiked at 0.1, 1.0 and 100 ppm) and 95% for two disulfonic acid (spiking at 1.5, 2.0, and 3.5 ppm) (S.D.
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Analysis for daminozide in apple juice by anion-exchange chromatography-particle beam mass spectrometry
TL;DR: Daminozide [Alar, succinic acid mono(2,2-dimethylhydrazide] is measured directly as the parent compound in 11 commercially obtained apple juice samples at levels ranging from 0 to 280 ppb as discussed by the authors.
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