...Robert C. Newton; Craig E. Manning Abstract Quartz solubility in H 2 O-CO 2 fluids was measured at 800 °C and 10 kbar. Mixed fluids were generated from hydrous oxalic acid, silver oxalate, silver carbonate, and liquid H 2 O; solubility was determined by weight changes of the quartz crystals...

... composition coexisting with the assemblages of either reaction, starting with fine-grained mixtures of reactants and products in nearly equimolar amounts and liquid water, oxalic acid, and silver oxalate as fluid sources. Brackets of TEQ were secured by reversing the reaction over narrow temperature intervals...

...Jeffrey M. Rosenbaum; Matthew M. Slagel Abstract The effects of packing materials on H infiltration into sample capsules during piston-cylinder experiments has been examined using samples of oxalic acid dihydrate, silver oxalate, and pure carbon dioxide. Mass scans revealed that as much as several...

...Andrea M. Koziol Abstract The pressure-temperature equilibrium curve of the reaction siderite + hematite = magnetite + CO 2 was determined in the range 5–12 kbar and 480–650°C by piston-cylinder experiments, with NaCl as a pressure medium. Silver oxalate was used as a CO 2 source and samples were...

... medium. Silver oxalate was used as a CO 2 source and charges were buffered at hematite-magnetite oxygen fugacity. Reaction progress was monitored by weight changes upon puncturing of CO 2 -inflated quenched charge capsules and was confirmed by comparing X-ray diffractograms of charges made before...

... and silver oxalate. At 715 °C our pressure for Reaction 1 is 10.4 ± 0.2 kbar, and for Reaction 2 it is 590 ± 30 bars. From these two reactions we derive Δ H f.298 0 = 33.41 ± 0.83 kJ for enstatite from the oxides. Using an extrapolated heat-capacity equation for magnesite, we obtain Δ H f.298 0 = − 116.68 kJ...

... or other contaminants in the atmosphere, because the ambient atmosphere is purged from the capsule during the loading process. Some substances, e.g., Xe, are obtainable only in the gaseous state and are difficult to load using other techniques. For CO 2 , this system eliminates the need for using silver...

...., Manning and Boettcher 1994 ). The uncertainty in the values of T reported in Tables 1 and 2 is therefore taken as ±3 ° C. Quantitative interpretation of the measured CO 2 and H 2 O losses required accurate assessment both of the CO 2 content of the silver oxalate and of the amount of any H 2 O...

... (0.07) 4.16 H 2 O 0.16     Total 99.67 99.99 A single glass piece (ca. 1 × 3 × 15 mm, approx. 115 to 120 mg) was loaded with silver oxalate (Ag 2 C 2 O 4 ) as the CO 2 source and doubly distilled water into a Pt-capsule (inner diameter:3–4 mm, wall thickness:0. 2 mm, length:2.5–3.5...

... No. (analyses) 11 16 14 15 11 12 14 NBO / T 0.000 0.016 0.046 0.056 0.086 0.107 0.156 Si/Al 3.03 3.03 3.14 3.11 3.03 3.14 3.12 Na 2 O excess −0.33 0.75 2.14 2.58 3.90 4.82 6.87 Silver oxalate (Ag 2 C 2 O 4 ) was used as the CO 2 source in the synthesis experiments...

... metals to solution) and sulfate reduction. Bacterial sulfate reduction to H 2 S can be very rapid if reactive organic carbon is present and can lead to precipitation of metal sulfides and perhaps increase the solubility of elements such as silver, gold, and arsenic that form stable Me-H 2 S aqueous...

...Figure 4. BSE images of samples recovered from experiments with the pyrope-oxalate starting material (A). HT = high-temperature and LT = low-temperature sample sides. The gravity vector is directed downward. Color images were taken in the element mapping mode. The numbers at the upper right...

... with this species (Hamilton et al. , unpublished data). Laboratory investigations indicated that ~0.04 mM oxalate would adequately represent crested wheatgrass root exudates in the INEEL system (B. Bugbee, pers. comm., 2002). The IMt-1 illite clay (Cambrian shale, Silver Hill, Montana) from The Source Clays...

.... The synthetic weddelite was prepared by slowly mixing stoichiometric amounts of sodium oxalate and calcium chloride at 0 °C. The resulting material was filtered and washed with deionized water until free of chloride (checked by the silver nitrate method). After drying, phase identification was conducted...

...Scott A. Wood; Julie Van Middlesworth Abstract Acetate and oxalate are simple organic ligands that occur naturally in surface waters, groundwaters, and soils; they may play a role in the transport of palladium in such environments. Mass transfer of Pd in surface environments has implications...

... near Burraga (80 km S of Bathurst, New South Wales, Australia) and the Sunny Corner silver mine (20 km W of Lithgow, NSW), all being abandoned over 100 years ago but still with significant old workings and remains of the smelters. Here the students learned about the mineralogy, geochemistry, acid mine...

... CO 3 –H 2 O–CO 2 –C were carried out at 5.7 GPa and 1150–1420 °C. As fluid-generating agents, we used oxalic acid, water, and silver oxalate. Based on data in [ 82 ], we concluded that in our experiments, the diamond formation medium was a supracritical fluid. The spontaneous nucleation of diamond...

... onto the started reagent was determined by means of gas chromatography (thermal extraction at 300 °C). The content of gases in the starting materials was 0.025 wt% (natural dolomite), 0.053 wt% (Na 2 CO 3 ), and 0.004 wt% (CaCO 3 ). Í 2 Î was added as distilled water and ÑÎ 2 as silver oxalate (Ag...

...). The crystal structure was refined from synchrotron single-crystal X-ray diffraction data to R 1 = 0.0341 for 596 observed reflections with F 0 > 4σ( F 0 ). The structure is based on sheets of edge- and corner-sharing octahedra parallel to the bc plane. Sheets link in the a direction via oxalate anions...