Guest Editorial

Miller-Ihli, Nancy J.

doi:10.1366/0003702971941557

Cited by 20 publications

(38 citation statements)

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“…Finally, the hair slurry was adjusted to a final volume of 25 ml by addition of ultrapure water. The hair slurries were kept in polyethlene vials at 4~ These hair slurries give a volume of solid/volume of diluent factor in accordance with Miller-INi [23].…”

Section: Analytical Proceduresmentioning

confidence: 99%

“…A mean particle size of about 0.8mm was obtained for slurries prepared from hair samples pulverized for 20m in. Although slurries prepared from particle sizes larger than 0.8 mm can be efficiently sampled [12,[23][24][25], we have obtained important unpowdered hair portions when hair samples were pulverized for less than 20 rain, and an additional sieving step was needed when times less than 20 rain were used. In order to obtain a simple slurry preparation procedure, the use of a longer time for the pulverization is preferred.…”

Section: Analytical Proceduresmentioning

confidence: 99%

“…As an ultrasonic autosampler [23][24][25] was not employed, mixing was performed in the autosampler cups directly prior to the sampling of the slurry. This permitted a maximum elimination of the error resulting from sedimentation of solids.…”

Section: Analytical Proceduresmentioning

confidence: 99%

“…Partitioning of analytes between the liquid and solid phases has been reported by several authors [23][24][25][26][27][28], and it is well established that the analyte extraction from the solid particles of the slurries can be efficiently increased using acidic media. In our experience, the analyte mobilization from the solid phase depends on the sample matrix and also on the metal.…”

Section: Effect Of the Liquid Media On The Silver Partitioningmentioning

confidence: 99%

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Determination of traces of silver in human scalp hair slurries by electrothermal atomic absorption spectrometry

Bermejo–Barrera

Moreda–Piñeiro

et al. 1998

Mikrochim Acta

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Abstract.A simple and rapid method for the determination of traces of silver in human hair by slurry sampling and electrothermal atomic absorption spectrometry was optimized. Hair pulverization and the particle size reduction were achieved using a vibrational zirconia mill ball for 20 min. Palladium nitrate, magnesium nitrate and palladium-magnesium nitrate were investigated as chemical modifiers to thermally stabilize silver. Glycerol was used as wetting agent to stabilize the hair slurries. A limit of detection of 21.6ggkg -1 was obtained for the use of palladium nitrate as best chemical modifier. The repeatibility of the overall procedure (slurry preparation and atomic absorption spectrometric determination) corresponding to eleven measurements was 14.3%. Matrix effect was significant and so, the standard addition method was used to determine silver in hair samples from healthy people. The levels found varied between 0.10 and 1.62mg kg -1.

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Section: Analytical Proceduresmentioning

confidence: 99%

Section: Analytical Proceduresmentioning

confidence: 99%

Section: Analytical Proceduresmentioning

confidence: 99%

Section: Effect Of the Liquid Media On The Silver Partitioningmentioning

confidence: 99%

See 2 more Smart Citations

Determination of traces of silver in human scalp hair slurries by electrothermal atomic absorption spectrometry

Bermejo–Barrera

Moreda–Piñeiro

et al. 1998

Mikrochim Acta

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“…If predominantly ultrasonification for complete mixing before sample injection is used, together with a commercially available system [44,50,51] and quite similar laboratory-made systems, automated operation of slurry sampling is possible with nearly all commercially available ET -AAS systems [52]. This"together with less difficult calibration compared to direct solid sampling, might be the reason that more papers have now appeared dealing with slurry sampling ET-AAS.…”

Section: Solid Samplesmentioning

confidence: 99%

Sample Preparation: an Introduction

Stoeppler¹

1997

Sampling and Sample Preparation

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Potential of two‐dimensional near‐infrared correlation spectroscopy in studies of pre‐melting behavior of nylon 12

Ozaki

Liu

Noda

1997

Macromolecular Symposia

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This review paper discusses the potential of generalized two-dimensional (2D) near-infrared (NIR) correlation spectroscopy in studies of pre-melting behavior and hydrogen bonds of nylon 12. A 2D NIR study on dissociation and hydrogen bonds ofN-methylacetamide (NMA) is also reviewed here as a model compound study of nylon 12. Fourier transform (€T)-NIR speara in the region of 9000-5000 cni' of nylon 12 were measured over a temperature range of 30-150°C where gradual weakening of inter-or intramolecular associative interactions and decrease of local order leading to the eventual fusion of nylon 12 crystals are observed. The 2D correlation analysis provided the following conclusions for the pre-melting behavior of nylon 12. (i) There are at least eight bands in the 6800-6100 cm-' region assignable to free-and hydrogen-bonded NH groups of nylon 12 in various environments. The asynchronous 2D correlation spectrum in the above region indicates that the amide groups with free carbonyl oxygen appear first agd then the unassociated free amide and amide groups with free NH follow as the temperature is increased. (hi The asynchronous spectrum in the 6000-5500 cm-' region, where the first overtones of the CH, stretching modes are expected to appear, indicates that substantial amount of disordered or dissociated components start appearing before the disappearance of more ordered components. It seems that they appear as the pre-melting precursors (or even possibly as the indirect cause) to the precipitous decrease of the ordered components associated with melting of nylon 12 occurring at a much higher temperature.

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Guest Editorial

Cited by 20 publications

References 0 publications

Determination of traces of silver in human scalp hair slurries by electrothermal atomic absorption spectrometry

Determination of traces of silver in human scalp hair slurries by electrothermal atomic absorption spectrometry

Sample Preparation: an Introduction

Potential of two‐dimensional near‐infrared correlation spectroscopy in studies of pre‐melting behavior of nylon 12

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