Sulfur dioxide measurement

Smoke concentrations ranged from 0.3 to more than 4 mg m . Daily means of the sampling stations are shown in Fig. 18-4. Sulfur dioxide measurements ranged from less than 0.1 ppm (260 /rg m ) to 1.34 ppm (3484 /Ag m" ). Also, 4 of the 11 stahons had at least one daily value in excess of 1 ppm, and 9 of the 11 stations had at least one daily value in excess... 

In a report comparing community responses to low-level exposure to a mixture of air pollutants from pulp mills, Jaakkola et al. (1990) reported significant differences in respiratory symptoms between polluted and unpolluted communities. The pollutant mixture associated with the pulp mills included particulates, sulfur dioxide, and a series of malodorous sulfur compounds. Major contributors in the latter mixture include hydrogen sulfide, methyl mercaptan, and methyl sulfides. In this study the responses of populations from three communities were compared, a nonpolluted community, a moderately polluted community, and a severely polluted community. Initial exposure estimates were derived from dispersion modeling these estimates were subsequently confirmed with measurements taken from monitoring stations located in the two polluted communities. These measurements indicated that both the mean and the maximum 4-hour concentrations of hydrogen sulfide were higher in the more severely polluted community (4 and 56 g/m3 2.9 and 40 ppb) than in the moderately polluted one (2 and 22 g/m3 1.4 and 16 ppb). Particulate measurements made concurrently, and sulfur dioxide measurements made subsequently, showed a similar difference in the concentrations of these two pollutants between the two polluted communities. 

For oxidation of sulfur dioxide, measurements of effectiveness were made by Kadlec, Pour, and Regner [Coll. Czech. Chem. Commun. 33, 2388, 2526 (1968)] whose data are shown following. They are at atmospheric pressure. The initial content of SOz and the conversion have little effect on the result. Both increase in size of granule and temperature lower the effectiveness, although the effect of temperature is somewhat erratic. 

Krueger, A.J., L.S. Walter, P.K. Bhartia, C.C. Schnetzler, N.A. Krotkov, I. Sprod and G.J.S. Bluth (1995) Volcanic sulfur dioxide measurements from the total ozone mapping spectrometer (TOMS) instruments. Journal of Geophysical Research 100 14057-14076. 

Mohler O. and Arnold F. (1992). Gaseous sulfuric acid and sulfur dioxide measurements in the Arctic troposphere and lower stratosphere Implications for hydroxyl radical abundances. Ber. Bunsenges. Phys. Chem., 96, 280-283. 

Jackson s modified sulfur dioxide measurement (Experiment 40)... 

Krueger A. J., Walter L. S., Bhartia P. K., Schnetzler C. C., Krotkov N. A., Sprod I., and Bluth G. J. S. (1995) Volcanic sulfur dioxide measurements from the Total Ozone Mapping Spectrometer (TOMS) instruments. J. Geophys. Res. 100, 14057-14076. 

Roasting galena [lead(II) sulfide] is an early step in the industrial isolation of lead. How many liters of sulfur dioxide, measured at STP, are produced by the reaction of 3.75 kg of galena with 228 L of oxygen gas at 220°C and 2.0 atm Lead(II) oxide also forms. 

Comments on the Site. Safety. Hydrogen sulfide and sulfur dioxide measurements were taken at all points where the sulfur-laden products were handled using a Draeger type 21/31 manual pump unit and the MSA No. 2 explosivimeter. The levels of potential safety hazards are shown in Table IX. 

As discussed later, work in the United States has also led to formulas based largely on sulfur dioxide measurements U.S. investigators are also trying to account for the effect of differences in shape (e.g., see Fig. 2.6, Tables 2.10 and 2.13), while Van Eijnsbergen also comments on the effect of orientation in solid structures in certain circumstances (Table 2.14). Effects of time of day (Table 2.15) are not of significance under practical conditions characterized by continuing exposure. 

Fig. 2.2B ISCXTORRAG tests. Corrosion rate vs. sulfur dioxide measurements (Knotkova, 1993). (See Table 2.7B for identification of sites.)...

Strike anywhere matches contain the compound tetraphosphorus trisulfide, which burns to form tetraphosphorus decoxide and sulfur dioxide gas. How many milliliters of sulfur dioxide, measured at 725 torr and 32 C, can be produced from burning 0.800 g of tetraphosphorus trisulfide ... 

Several direct spectrophotometric methods are used for sulfur dioxide measurement, including nondispersive infrared absorption, Fourier transform infrared analysis (FTIR), ultraviolet absorption, molecular resonance fluorescence, and second-derivative spectrophotometry. The principles of these methods are the same for any gas measured. 

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