Search results
Results from the WOW.Com Content Network
Dioscorides noted lead's effect on the mind in the first century AD. Roman lead water pipes with taps. Lead poisoning was among the first known and most widely studied work-related environmental hazards. [186] One of the first metals to be smelted and used, [121] lead is thought to have been discovered and first mined in Anatolia around 6500 BC ...
Lead (Pb) is a heavy trace element and is formed by the radioactive decay of uranium and thorium. In crustal rocks, it is present as the lead sulfide mineral galena. [1] Natural sources of lead in the lead cycle include wind borne dust, volcanic outgassing, and forest fires. [2]
Lead can accumulate in soils, especially those with a high organic content, where it remains for hundreds to thousands of years. Environmental lead can compete with other metals found in and on plant surfaces potentially inhibiting photosynthesis and at high enough concentrations, negatively affecting plant growth and survival. Contamination of ...
The World Health Organization (WHO) specifically notes that there is "no known safe blood lead concentration," and that even blood lead concentrations as low as 3.5 µg/dL (micrograms per ...
The effect of pesticides on soil microorganisms is impacted by the persistence, concentration, and toxicity of the applied pesticide, in addition to various environmental factors. [70] This complex interaction of factors makes it difficult to draw definitive conclusions about the interaction of pesticides with the soil ecosystem .
Lead, mercury and other pollutants could be affecting the ratio of boys to girls born each year, according to a new study published Thursday. Lead, mercury, other pollutants could affect birth ...
An indicator reflecting the loss of nitrate to groundwater would be effect-based. [51] The environmental impact of agriculture involves a variety of factors from the soil, to water, the air, animal and soil diversity, plants, and the food itself.
For premium support please call: 800-290-4726 more ways to reach us