A field and laboratory based experiment conducted to assess the effects of different pH ranges of simulated acid rain (2.5, 3.5, 4.5 and 5.5) was studied on chlorophyll and ascorbic acid contents in two cultivars (cv. Himalaya and cv.Kaushik) of a medicinal herb Mentha piperita. Chlorophyll and ascorbic acid contents of leaves were adversely affected at pH 2.5 and 3.5. The effects of simulated ...

Number 10 — In Part 1 of th~ essay, I I defined the problem of acid rain and briefly reviewed some of the voluminous scienM[c literature on the subject. In this part, I will examine the worldwide nature of the acid-rain problem, public perceptions of it, and some possible solutions. Many of the studies to date have indk cated that acid rain is rapidly becoming a worldwide problem. The portrayal...

While pure rain is naturally slightly acidic, the higher level of acidity in acid rain makes it a threat to plant and aquatic life and to some manmade materials and structures. The slight natural acidity of pure rain is the result of carbon dioxide in the air dissolving in water to produce a weak carbonic acid solution. This natural acid in rainfall and snowmelt is partly responsible for the lo...

Many issues of concern to scientists have a significant impact on the general public. Political, economic, and social issues often revolve around questions that can be resolved only through seienttitc inquiry. Such questions frequently arise from man’s use of technology. In previous essays we have reviewed issues in which th~ is the case, such as indoor workplace pollution and the benefhs and r...

Once the acidic gases have been emitted to the atmosphere they can be transported over large distances. Hydrogen chloride is highly soluble and is deposited close to source areas, whereas sulphur dioxide and nitrogen oxides are relatively insoluble (at atmospheric concentrations) and are therefore usually transported much further from the source before being deposited. For example, around 90% o...

The papers in this issue of Environmental Health Perspectives EHP on potential health effects from acid rain are from the Conference on Health Effects of Acid Precipitation held at the National Institute of Environmental Health Sciences, Research Triangle Park, North Carolina, in November 1984. The planning began about a year earlier as an outcome of a small workshop to discuss whether or not t...

Once the acidic gases have been emitted to the atmosphere they can be transported over large distances. Hydrogen chloride is highly soluble and is deposited close to source areas, whereas sulphur dioxide and nitrogen oxides are relatively insoluble (at atmospheric concentrations) and are therefore usually transported much further from the source before being deposited. For example, around 90% o...

Acid rain still poses a global problem today, exerting many adverse effects on man, animal, and materials. As its research question, the present study tries to find out whether or not acid rains exist in Akure, Nigeria. For so doing, it determines physico-chemical properties of rain water samples, namely pH, temp, Electrical Conductivity (EC), TDS, acidity, SO4-, NO2-, Cl-, and Free CO2. Accord...

Acid rain still poses a global problem today, exerting many adverse effects on man, animal, and materials. As its research question, the present study tries to find out whether or not acid rains exist in Akure, Nigeria. For so doing, it determines physico-chemical properties of rain water samples, namely pH, temp, Electrical Conductivity (EC), TDS, acidity, SO4-, NO2-, Cl-, and Free CO2. Accord...