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| 1 | In-Situ Differentiation of Acidic and Non-Acidic Tundra via Portable X-ray Fluorescence (PXRF) Spectrometry显示文摘Frozen soils or those with permafrost cover large areas of the earth's surface and support unique vegetative ecosystems. Plants growing in such harsh conditions have adapted to small niches, which allow them to survive. In northern Alaska, USA, both moist acidic and non-acidic tundra occur, yet determination of frozen soil p Hs currently requires thawing of the soil so that electrometric pH methods can be utilized. Contrariwise, a portable X-ray fluorescence(PXRF) spectrometer was used in this study to assess elemental abundances and relate those characteristics to soil pH through predictive multiple linear regressions. Two operational modes, Soil Mode and Geochem Mode, were utilized to scan frozen soils in-situ and under laboratory conditions, respectively, after soil samples were dried and ground. Results showed that lab scanning produced optimal results with adjusted coefficient of determination(R^2) of 0.88 and 0.33 and root mean squared errors(RMSEs) of 0.87 and 0.34 between elemental data and lab-determined pH for Soil Mode and Geochem Mode, respectively. Even though the presence of ice attenuated fluoresced radiation under field conditions, adjusted R^2 and RMSEs between the datasets still provided reasonable model generalization(e.g., 0.73 and 0.49 for field Geochem Mode). Principal component analysis qualitatively separated multiple sampling sites based on elemental data provided by PXRF, reflecting differences in the chemical composition of the soils studied. Summarily, PXRF can be used for in-situ determination of soil pH in arctic environments without the need for sample modification and thawing. Furthermore, use of PXRF for determination of soil pH may provide higher sample throughput than traditional eletrometric-based methods, while generating elemental data useful for the prediction of multiple soil parameters. | Somsubhra CHAKRABORTY David C. WEINDORF GARY J. MICHAELSON Chien Lu PING Ashok CHOUDHURY Tarek KANDAKJI Autumn ACREE Akriti SHARMA WANG Dandan | 2016 | Pedosphere2016，26，4： | 4 |
| 2 | Preparation of vaccines for Rocky Mountain spotted fever from rickettsiae propagated in cell culture显示文摘 | Kenyon RH Acree WM Wright GG | 1972 | J Infect Dis1972，125，14： | 1 |
| 3 | A procedure for the sensory analysis of gas chromatographic effluents显示文摘 | Acree T E Bamard J Cunningham D G | 1984 | Food Chemistry1984，4，14： | 1 |
| 4 | Solubility of Anthracene in Binary Alkane-3-Methyl-1-butanol Solvent Mixtures显示文摘 | Zvaigzne A I Acree Jr W E | 1994 | Journal of Chem- ical and Engineering Data1994，39，1： | 1 |
| 5 | Changes in the aroma and odor of Chardormay wine due to malolactic fermentation显示文摘 | Laurent M H Henick-Kling T Acree T E | 1994 | Wein-Wissenschaft1994，49，1： | 1 |
| 6 | Fracture analysis of FRP reinforced concrete beams 显示文摘 | Arup Maji Analilia Orozco Robert Acree | 2001 | Journal of Engineering Mechanics2001，，6： | 1 |
| 7 | Gas chromatography olfactometry (GC/O) of dairy products显示文摘 | Friedrich J E Acree T | 1998 | International Dairy Journal1998，8，3： | 1 |
| 8 | Quantitative capacitive measurements of voidage in gas-solid flows 显示文摘 | Acree R C Louge M | 1989 | Particulate Science and Technology1989，7，12： | 1 |
| 9 | Pore pressure diffusion and the mechanism of reservoir - induced seismicity 显示文摘 | Talwani P and Acree S | 1985 | Pageph1985，122，198485： | 1 |
| 10 | Solubility of anthracene in binary alkane + 3-methyl-1-butanol solvent mixture显示文摘 | Zvaigzne A I Acree Jr W | | 0，，04： | 1 |
| 11 | Reviewed: GC/Olfactometry GC With a sense of smell 显示文摘 | Acree T E Peer | 1997 | Analytical Chemistry1997，69，5： | 1 |
| 12 | Development and testing of power assisted current limiting fuses to 600 ampers and 38kV显示文摘 | PFLANZ H M ACREE J A SCHAFFER J S | 1988 | IEEE Trans on Power Delivery1988，3，2： | 1 |
| 13 | Sweet taste of D and L-sugars and amino-acids and the steric nature of their chemo-receptor site 显示文摘 | R S Shallenberger T E Acree C Y Lee | 1969 | Nature1969，，221： | 1 |
| 14 | Development and testing of power assisted current limiting fuses to 600 amperes and 38 kV显示文摘 | Pflanz H M Acree J A Schaffer J S | 1988 | IEEE Transactions on Power Delivey1988，3，2： | 1 |
| 15 | Molecular theory of sweet taste 显示文摘 | SHALLENBERGER R S ACREE T E | 1967 | Nature1967，5114，216： | 1 |
| 16 | Effect of wine type on the detection threshold for diacetyl显示文摘 | MARTINEAU B ACREE T E THOMAS H K | 1995 | Food Res Int1995，28，2： | 1 |
| 17 | Ressessment of the influ- ence of malolactic fermentation on the concentration of diacetyl in wines 显示文摘 | MARTINEAU B THOMAS H K ACREE T E | 1995 | Am J Enol Vitieult1995，46，： | 1 |
| 18 | Molecular theory of sweet taste 显示文摘 | R S Shallenberger T E Acree | 1969 | Nature1969，216，5114： | 1 |
| 19 | Reverse osmosis concentration of apple juice:flux and flavor retention by cellulose acetate and polyamide membranes显示文摘 | CHUA H T RAO M A ACREE T E | 1987 | Journal of Food Process Engineering1987，9，3： | 1 |
| 20 | A procedure for thesensory analisis of gas chromatographic effluents 显示文摘 | Acree T E Barnard J Cunningham D G | 1984 | Food Chemistry1984，14，4： | 1 |
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