Zobrazeno 1 - 10
of 26
pro vyhledávání: '"Richard J. Stolzberg"'
Publikováno v:
Environmental Science & Technology. 38:3294-3298
The concentrations of phenanthrene, anthracene, fluoranthene, pyrene, benzo[a]anthracene, chrysene, and hexachlorobenzene (HCB) were measured in spruce needles at 36 sites in eastern Alaska during early spring. Concentrations of each polycyclic aroma
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::45b21de53e5d128e07bf25674d65ddeb
https://doi.org/10.1021/es034751n
https://doi.org/10.1021/es034751n
Autor:
Richard J. Stolzberg
Publikováno v:
The Chemical Educator. 6:291-294
A fractional-factorial screening experiment that helps students identify important factors in gas chromatographic method development is described. The experiment gives practical experience in relating chromatographic theory to practice. The results o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f0567bc011982f84499ab1bfb1a450f9
https://doi.org/10.1007/s00897010504a
https://doi.org/10.1007/s00897010504a
Publikováno v:
Science of The Total Environment. :127-134
Snowpack samples were collected at 20 sites on the Kola Peninsula, Russia, in April 1991. Samples were collected both in remote regions and in areas impacted by nearby emission sources, including the Severonikel CuNi smelter in the city of Monchegors
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4844f8e2d5b221e13c3b5c28a11f4bbc
https://doi.org/10.1016/0048-9697(95)04350-a
https://doi.org/10.1016/0048-9697(95)04350-a
Publikováno v:
Analytica Chimica Acta. 239:53-59
Monte Carlo simulations can be used to determine the precision of an analytical method if the standard deviations of the component unit operations are estimated accurately. Alternative methods for estimating the standard deviation have been compared
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::251b15514bdf2d2ee251e8b5b4aabf86
https://doi.org/10.1016/s0003-2670(00)83835-0
https://doi.org/10.1016/s0003-2670(00)83835-0
Publikováno v:
The Science of the total environment. 345(1-3)
Benzene and toluene mixing ratios were measured in the indoor air of two subarctic homes during summer and winter. Benzene in the living area of these homes ranged from 1 to 25 ppbv and toluene ranged from 1 to 104 ppbv. Source strength estimate calc
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::46358772a3dcae976d492c9d14c7bc52
https://pubmed.ncbi.nlm.nih.gov/15919525
https://pubmed.ncbi.nlm.nih.gov/15919525
Publikováno v:
Applied Spectroscopy. 46:704-706
Theory and experiment show that the precision of quantitative derivative ultraviolet spectrometry depends on the choice of derivative order, degree of smoothing, convolution method of smoothing or derivatization, and power of the reference beam. Exce
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::21124863b15f2215b69af12ba3dd6c1f
https://doi.org/10.1366/0003702924124880
https://doi.org/10.1366/0003702924124880
Autor:
Richard J. Stolzberg
Publikováno v:
Journal of Chemical Education. 76:834
A simplex optimization experiment for use in the upper-level chemistry laboratory curriculum is described. Students adjust the level of four variables to maximize the signal-to-noise ratio (S/N) in the flame atomic absorption determination of calcium
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d10c3af8d077ea94a080a8c98ec601c5
https://doi.org/10.1021/ed076p834
https://doi.org/10.1021/ed076p834
Autor:
Richard J. Stolzberg
Publikováno v:
Journal of Chemical Education. 76:640
Students are challenged to investigate the hypothesis that an equilibrium constant, K c , measured as a product and quotient of molar concentrations, is constant at constant temperature. Spectrophotometric measurements of absorbance of a solution of
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7aabc83d1f8e7730e8fc1be81edfb108
https://doi.org/10.1021/ed076p640
https://doi.org/10.1021/ed076p640
Autor:
Richard J. Stolzberg
Publikováno v:
Journal of Chemical Education. 75:1453
Post-1982 pennies have a varying copper content that can be investigated in the introductory analytical chemistry lab. Groups of four students analyzed ten pennies sampled from the entire minting period to test the hypothesis that the copper shell we
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2bbeb9f0055441c43a76c3a2959387ec
https://doi.org/10.1021/ed075p1453
https://doi.org/10.1021/ed075p1453
Autor:
Richard J. Stolzberg
Publikováno v:
Journal of Chemical Education. 74:216
Students are introduced to screening and sequential experimentation using simulations and experimentation. The work begins with spreadsheet simulations and practice with the experimental design software. Students learn how to use the graphical output
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c86850e37d0345ba33071dff74400047
https://doi.org/10.1021/ed074p216
https://doi.org/10.1021/ed074p216