Mercury dispersion

Friedrich, G.H. and Hawkes, H.E., 1966. Mercury dispersion haloes as ore guides for massive sulphide deposits. West Shasta District, California. Mineral. Deposita, 2 77-88. 

Van den Boom, G. and Poppelbaum, M., 1980. Determination of the presence of primary mercury dispersion around the volcanogenic sulphide ore deposit "Woodlawn", New South Wales, Australia Geol. Jb., D37 15-27. 

Kot F, ShumiUn E, Rodriguez-Figueroa GM, Mirlean N (2009) Mercury dispersal to Arroyo and coastal sediments from abandoned copper mine operations, El Boleo, Baja California BuU Environ Contam Toxicol 82 20-25... 

Light sources can either be broadband, such as a Globar, a Nemst glower, an incandescent wire or mercury arc lamp or they can be tunable, such as a laser or optical parametric oscillator (OPO). In the fomier case, a monocln-omator is needed to achieve spectral resolution. In the case of a tunable light source, the spectral resolution is detemiined by the linewidth of the source itself In either case, the spectral coverage of the light source imposes limits on the vibrational frequencies that can be measured. Of course, limitations on the dispersing element and detector also affect the overall spectral response of the spectrometer. 

Coarse 40-60 Filtration of coarse materials. Gas dispersion, gas washing, gas absorption. Mercury filtration. For extraction apparatus. 

Another method of preparing mercuric acetate is the oxidation of mercury metal using peracetic acid dissolved in acetic acid. Careful control of the temperature is extremely important because the reaction is quite exothermic. A preferred procedure is the addition of approximately half to two-thirds of the required total of peracetic acid solution to a dispersion of mercury metal in acetic acid to obtain the mercurous salt, followed by addition of the remainder of the peracetic acid to form the mercuric salt. The exothermic reaction is carried to completion by heating slowly and cautiously to reflux. This also serves to decompose excess peracid. It is possible and perhaps more economical to use 50% hydrogen peroxide instead of peracetic acid, but the reaction does not go quite as smoothly. 

A 500-ml three-necked flask is fitted with a thermometer, a condenser, and a gas dispersion tube. A tube from the condenser outlet dips below the surface of mercury in a side-arm test tube. The mercury is covered with a layer of acetone, which serves to destroy excess diborane by the reaction to form diisopropoxyborane, [(CH3)2CH0-LBH (Fig. 4.1). 

Zerstkubung, /, comminution, flne disintegration, atomization spatt-ering, scattering dispersion spraying, spray (of mercury) flouring (cathode) sputtering,... 

A 2-1. two-necked, round-bottomed flask equipped with a magnetic stirrer (Note 1) is fitted with a 250-ml. pressure-equalizing constant-rate dropping funnel and a condenser, the top of which is connected to a mercury trap to prevent the entrance of air during the reaction and for the detection of gas evolution. The dropping funnel is removed, and 35 g. (0.85 mole) of sodium hydride dispersed in mineral oil is added (Note 2). The mineral oil is removed by washing the dispersion four times with 100-ml. portions of benzene (Note 3). The benzene is removed with a pipet after the sodium hydride is allowed to settle (Note 4). 

A number of environmental issues have received widespread publicity (Table 7.1), from major accidents at plants (e.g., Seveso and Bhopal) to the global and regional impacts associated with energy utilization (e.g., carbon dioxide, acid rain, and photochemical oxidants), the improper disposal of chemical waste (e.g., Love Canal and Times Beach), and chemicals that have dispersed and bioaccumulated affecting wildlife (e.g., PCBs and DDT) and human health (e.g., cadmium, mercury, and asbestos). 

Several structurally different types of HNLs occur in nature, which likely originated hy convergent evolution from different ancestral proteins. The enzyme from almond (PaHNL) was first crystallized in 1994 and the structure was solved by multiple wavelength anomalous dispersion of a mercury derivative. The first 3D structure analysis of PaHNL was performed in 2001. ° (7 )-PaHNL from almond uses FAD as cofactor and is related to oxidoreductases it exhibits HNL activity only in the oxidized form of FAD." ... 

Native silver is rarely found in the form of nuggets, and it is probably for this reason that silver was recognized and came into widespread use at later times than did gold. Much native silver occurs as minute grains dispersed in small concentration in argentiferous (silver-rich) sands. Now, when silver is mixed with mercury, it forms amalgams (see below) the amalgamation... 

The high mobility and tendency to dispersion exhibited by mercury, and the ease with which it forms alloys (amalgams) with many laboratory and electrical contact metals, can cause severe corrosion problems in laboratories. A filter-cyclone trap is described to contain completely mercury ejected accidentally by overpressuring of mercury manometers and similar items. 

The material is known to be an intimate mixture of mercury(II) oxide and finely dispersed metallic mercury. 

Infrared radiation was discovered by Herschel [58] in 1800, using a mercury thermometer to detect sunlight dispersed by a prism. However, the Latin poet Lucretius in his De rerum Natura (On the Nature of Things, about 50 BC) clearly showed a clear feeling of the infrared radiation. Of course Lucretius s terminology was far from the modern one, and he had no thermometer at his disposal ... 

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