Included are procedures for establishing continuous monitoring of ozonation systems for reliable and cost-effective operation of ozone disinfection. (CS)

Reviewed are a number of factors important in the formation of trihalomethanes (THM) including the nature of aquatic humus and the influences of preozonation, bromide, pH, and chlorine. A brief investigation is also conducted into the kinetics of the THM reaction. Several major research needs are represented. (CS)

This paper is concerned with problems in assessing the behavior of trace substances introduced into natural systems, sampling models of five classes that might be used in the study of contaminants are reviewed. Adaptation of an industrial experimentation method and techniques used in economic geology to ecological sampling is recommended.…

Extensive study affirms that vinyl chloride is a potent animal carcinogen. Epidemiological studies show elevated rates of human cancers in association with extended contact with the compound. (Author/RE)

Those who have chosen environmental health as a career should be prepared to assume leadership roles. New progress in awareness of environmental problems, public commitment to clean environment, and reduced occupational hazards have created the need for dedicated professionals in this field. (RE)

Turbidity problems which originate in water treatment plants and the use of control turbidimeters to reduce health hazards from water-borne diseases are considered. (CS)

Discussed is the currently known information relating to naturally occurring cancer-causing substances. Examples include: moldy grains, false morsel, coltsfoot, senecio plants, and bracken fern. (CS)

Fluorine, selenium, tin, and arsenic are among the trace elements occurring in the environment which are considered. Emphasis is given to developing a qualitative survey of the extent and kinds of metal transformations and their resultant effects. (CS)

A vexing modern conundrum is to be solved. The use of oil, gas, and coal is extremely short-lived as a historical phenomenon: a mere blink of an eye at a little more than 1% of total urban history of 10,000 years to-date. Yet current urban civilization is almost entirely based on it. And the fossil-fuel economy poses not only a massive security…

Although designated a long term environmental hazard, polychlorinated biphenyls are still finding their way to certain streams, lakes, stream and lake sediments and fresh-water biota. Useful though they may be, the Environmental Protection Agency will seek a halt to all polychlorinated biphenyls production and use in the United States. (BT)

Deals with water pollution in the following categories: a global view, self purification, local pollution, difficulties in chemical analysis, and remedies for water pollution. Emphasizes the extent to which man's activities have modified the cycles of certain elements. (GS)