Soil and Environmental Analysis: Modern Instrumental Techniques - Chapter 11 ppsx

... Denmead, and I.M. Jamie. 2002. Air-land exchanges of CO 2 ,CH 4 and N 2 O measured by FTIR spectrometry and micrometeorological techniques. Atmos. Environ. 35:1833–1842. Guenther, A.B. and A.J. ... different land-use types and the modeled fluxes (based on 3-D footprint and biophysical models). Such an approach is likely to be of increasing value in the real world where homogeneous...

Ngày tải lên: 11/08/2014, 12:21

... 4,4 0 (5 0 )-bis-t-butyl- cyclohexano-18-crown-6, a highly selective complexant for Sr 2þ , immobilized on an inert support. The column is washed with 12 column volumes of 8 M HNO 3 , which removes Ca and ... of 210 Pb soil inventories. J. Environ. Radioactivity 41 :111 –125. Bunzl, K., Flessa, H., Kracke, W. and Schimmack, W. 1995. Association of fallout 239,240 Pu and 241 Am with va...

Ngày tải lên: 11/08/2014, 12:21

... U.S.A. tel: 21 2-6 9 6-9 000; fax: 21 2-6 8 5-4 540 Distribution and Customer Service Marcel Dekker, Inc., Cimarron Road, Monticello, New York 12701, U.S.A. tel: 80 0-2 2 8-1 160; fax: 84 5-7 9 6-1 772 Eastern ... Metabolism and Action, edited by M. Daniel and R. P. Purkayastha Soil- Water Interactions: Mechanisms and Applications, Second Edition, Re- vised and Ex...

Ngày tải lên: 11/08/2014, 12:21

... optimization criteria are signal-to-background ratio and signal-to-noise ratio. In most instances, however, ICP-AES is used as a multielement tool, and therefore compro- mise operating conditions, ... mass-to-charge ratio. For example, if Cu and Pb are to be Figure 10 Schematic diagram of an ICP-MS instrument. (Reproduced with permission from Sharp, B., in Soil Analysis Modern Instr...

Ngày tải lên: 11/08/2014, 12:21

... a working range of pH 1–13, and that is a great deal tougher than any glass electrode. Mettler-Toledo and Thermo-Russell market ISFET pH electrodes for demanding environmental applications, but ... solid-state 5Â10 À5 to 1 Potassium plastic 10 À6 to 1 Copper solid-state 10 À8 to 0.1 Sulfide solid-state 10 À7 to 1 Cyanide solid-state 8 Â10 À6 to 10 À2 Sodium glass 10 À6 to 1 Fluoride soli...

Ngày tải lên: 11/08/2014, 12:21

... R-PDAH 2 þPADH 2þ 2 þ2Cl À , ,R-HCO 3 þNaHCO 3 R-PDAH 2 þPDAH 2þ 2 þ2C1 À Sample R-HCO 3 þMA! R-H þMA!R-H þMA R-PDAH 2 þMA þ2C1 À ! R-A þMHCO 3 R-M þPDAH 2þ 2 þ2C1 À þA R-A þNaHCO 3 ! R-M þHCl!R-H þMC1 R-M þPDAH 2þ 2 þ2C1 À ! R-HCO 3 þNaA R-PDAH 2 þMC1 2 Suppressor ... R-PDAH 2 þMC1 2 Suppressor column Eluent R-H þMHCO 3 ! R-OH þHCl!R-Cl þH 2 O 2R-OH þPDAH 2þ 2 þ2C1 À ! R-M þH 2 CO 3 2R-C1 þP...

Ngày tải lên: 11/08/2014, 12:21

... Cycl. 11: 295– 311. McGeehan, S.L. and D.V. Naylor. 1988. Automated instrumental analysis of carbon and nitrogen in plant and soil samples. Commun. Soil Sci. Plant Anal. 19:493–505. Merry, R.H. and ... Proc. 34:608–610. Tabatabai, M.A. and J. M. Bremner. 1991. Automated instruments for determina- tion of total carbon, nitrogen, and sulfur in soils by combustion techniques...

Ngày tải lên: 11/08/2014, 12:21

... small diameter (sub-mm for the latest third-generation synchrotrons), it can be used as an ‘‘x-ray fluorescence’’ microprobe. Furthermore, x-ray fluores- cence measurements can be combined wi th x-ray absorption ... thermal degradation and mechanical failure, the window must be made sufficiently thick (perhaps 200–300 mm) and, in consequence, the low-energy x-ray output of the tube is attenuat...

Ngày tải lên: 11/08/2014, 12:21

... C., and McDonnell, J.J., eds.). Elsevier, Amsterdam, pp. 87 118 . Johnston, A.M., Scrimgeour, C.M., Henry, M.O., and Handley, L.L. 1999. Isolation of NO  3 -N as 1-phenylazo-2-naphthol (Sudan-1) ... (including soil extracts) for 15 N determination. NO  3 is converted to 1-phenylazo-2-naphthol (Sudan-1), and the product is concentrated by reverse-phase chromatography before CF-IRMS....

Ngày tải lên: 11/08/2014, 12:21

... frequency and sampling times on chamber-based measurements of N 2 O emissions from fertilized soils. Glob . Change Biol. 7: 933–945. Smith, K.A. and C.E. Mullins, eds. 2000. Soil and Environmental Analysis: ... chambers used to measure gas exchange between soil and the atmosphere. Eur. J. Soil Sci. 51 :111 117 . Crill, P.M., M. Keller, A. Weitz, B. Grauel, and E. Veldkamp....

Ngày tải lên: 11/08/2014, 12:21