Regional traverse

A soil traverse of 20 km was made in the Ning-Zeng region in order to investigate the applicability of thermally-released Hg at the regional scale. The sample interval was 50 m, closing to 25 m across the Qixiashan lead-zinc deposit and the Mierenshan, Anjishan and Funiushan copper deposits. These sample intervals were strictly maintained so that any effects of pollution were included. Samples were analysed for Cu, Pb, Zn and thermally-released Hg and Hg,. 

Above the Qixiashan and Funiushan deposits there are prominent peaks for both Hgx and Hg, (Fig. 13-10). There is a weak Hg response over the Mierenshan deposit. The lack of response over the Anjishan deposit is attributed to its low grade, small size and deep burial. The low, broad peak of Hg, extending to the north of the Funiushan reflects the gossan cap. The remaining unmatched Hg, peak in the north-centre of the traverse 

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Adhering to our general method of treatment, we shall now evaluate a screening constant SM valid in the case of Z large. Taking the time average of r2 in the various regions traversed, we write... 

Experimental studies have been carried out in field locations in China. These studies include soil traverses over iron, copper, molybdenum and lead-zinc deposits, as well as a 20 km regional traverse and a regional grid. The results show significant anomalies above mineralisation, with low background values and good contrast. Both Hg, and Hg, contribute to indicating the location of buried mineral deposits. 

Fio. 11-3.—The wave functions n( ), n = 1 to 6, for the harmonic oscillator. For each case the heavy horizontal line indicates the region traversed by the classical harmonic oscillator with the same total energy. 

Fig. 5. X radiograph of an S. patens tussock. This x radiograph shows details of the internal structure of a relatively large tussock. The darker portions on the periphery and lower central part of the x radiograph are relatively rich in silt. The light-shaded region traversing the base of the tussock is composed of a mass of intertwined, 2-3-mm diam., rhizomes of, presumably, 5 patens. A number of similar plant parts are oriented vertically within the tussock, and very fine rootlets are evidently well dispersed throughout its entire volume, which extends some 10-12 cm above the adjacent surface of the marsh. Bar is 5 cm long.

Further benefits can be realized by the implementation of mass-selective external accumulation. The dynamic range and sensitivity of the instrument are improved. Mass-selective external accumulation can be achieved by interfacing a quadrupole mass filter with the FT-ICR mass spectrometer. The quadrupole can be operated either in RF/DC mass filtering mode, in which one m/z region traverses the quadrupole, or in RF-only resonant dipolar excitation mode. The latter allows selective removal of multiple m/z peaks. For example. Smith and co-workers showed that this mode could be applied to remove the [M -i- 16H] +and [M + 14H] +ions of myoglobin from the charge-state envelope + 13 through -i-18 [49]. 

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