Antimony in the environment: a review focused on natural waters: I. Occurrence

The 1999 Regional Haze Rule provides a context for this review of visibility, the science that describes it, and the use of that science in regulatory guidance The scientific basis for the 1999 regulation is adequate The deciview metric that tracks progress is an imperfect but objective measure of what people see near the prevailing visual range The definition of natural visibility conditions is adequate for current planning, but it will need to be refined as visibility improves Emissions from other countries will set achievable levels above those produced by natural sources Some natural events, notably dust storms and wildfires, are episodic and cannot be represented by annual average background values or emission estimates Sulfur dioxide (SO2) emission reductions correspond with lower sulfate (SO4 2−) concentrations and visibility im-provements in the regions where these have occurred Non-road emissions have been growing more rapidly than emissions from other sources, which have remained

Visibility: Science and Regulation

VOLUME I Introduction The Incentive Physical-Chemical Properties Experimental Methods Quantitative Structure-Property Relationships (QSPRs) Mass Balance Models of Chemical Fate Data Sources and Presentation Illustrative QSPR Plots and Fate Calculations References Aliphatic and Cyclic Hydrocarbons Lists of Chemicals and Data Compilations Summary Tables and QSPR plots References Mononuclear Aromatic Hydrocarbons Lists of Chemicals and Data Compilations Summary Tables and QSPR plots References Polynuclear Aromatic Hydrocarbons (PAHs) and Related Aromatic Hydrocarbons Lists of Chemicals and Data Compilations Summary Tables and QSPR plots References VOLUME II * Halogenated Aliphatic Hydrocarbons Chlorobenzenes and Other Halogenated Mononuclear Aromatics Polychlorinated Biphenyls (PCBs) Chlorinated Dibenzop-dioxins Chlorinated Dibenzofurans VOLUME III * Ethers Alcohols Aldehydes and Ketones Carboxylic Acids Phenolic Compounds Esters VOLUME IV Nitrogen and Sulfur Compounds Lists of Chemicals and Data Compilations Summary Tables References Herbicides Lists of Chemicals and Data Compilations Summary Tables References Insecticides Lists of Chemicals and Data Compilations Summary Tables References Fungicides Lists of Chemicals and Data Compilations Summary Tables References APPENDICES List of Symbols and Abbreviations Alphabetical Index CAS Registry Index Molecular Formula Index * Each chapter contains lists of chemicals and data compilations, summary tables, QSPR plots, and references

Handbook of Physical-Chemical Properties and Environmental Fate for Organic Chemicals

Lead isotopes in environmental sciences: a review.

Prediction of drug solubility from structure.

Airborne particulte matter was collected at urban sites in six Asian countries (Japan, Korea, China, Thailand, Sri Lanka, and Indonesia), and the stable lead isotope ratios were measured. Some source-related materials, such as coal and leaded gasoline, were also analyzed and compared to the ratios observed in airborne lead. Airborne lead isotope ratios differed considerably from each other, and these differences corresponded to differences in the regional source of lead. Leaded gasoline was still the primary source of lead in some cities in Asia, and the lead isotope ratios were strongly influenced by those of leaded gasoline

Characterization of sources of lead in the urban air of Asia using ratios of stable lead isotopes

rn Selenium was determined by neutron activation in 22 samples of snow and rain collected during the 1964-1965 winter and in seven air samples collected during the following spring in Cambridge, Mass. Sulfate was determined gravimetrically or turbidimetrically in most of the samples. In these samples and in well water and Cambridge tap water analyzed for comparison, the selenium concentration averaged 0.2 Mg. per liter of water or per 200 cu. meters of air, and the average value of the weight ratio Se/S = 1 X loT4. Approximately the same ratio is commonly found in igneous and sedimentary rocks, sulfide ores, and fossil fuels, but the sea water ratio is one thousandth as large. This information implies mainly a terrestrial, including pollution, source for selenium as well as sulfur in the atmosphere of the city of Cambridge.

Selenium in the atmosphere.

Prediction of seawater solubility of aromatic compounds

Atmospheric fingerprints of East Asia, 1986–1991. An urgent record of aerosol analysis by the jack network

A new method of generation of gases a t parts per million (ppm) levels for gas standards was developed. This method enables generation of many sorts of gases including Son, NO, (NO and N&), H2S, HCN, and NH3 by a simple apparatus and simple operations. The rate of gas generation depends on pH, Concentration, and temperature of the solution for gas generation, which contains a specific solute and buffer agents. This method possesses precision and-accuracy equal to those of the permeation tube, and the variation of the concentration of generated gas was less than 3%. Gases generated by this method can be utilized for calibration of the measuring instruments, biological and medical experiments, and studies on chemical reactions in ambient air.

Yoshikazu Hashimoto

Papers

Characterization of sources of lead in the urban air of Asia using ratios of stable lead isotopes

Selenium in the atmosphere.

Prediction of seawater solubility of aromatic compounds

Atmospheric fingerprints of East Asia, 1986–1991. An urgent record of aerosol analysis by the jack network

A new method of generation of gases at parts per million levels for preparation of standard gases.