Results from searches on:
With the public outrage and tough laws against water pollution caused by
industrial waste water, all factories are now strictly controlling discharge of waste. Currently, each local government designates water-quality standards and enforces restrictions. The pH of discharged water is one of the most measured items under water-quality regulations. Although pH does not necessarily indicate a particular kind of pollution, it is closely related with the survival of aquatic life. Abnormal pH can cause settling of halomorphic compounds and pollution of water. Also, each factory is required to treat its waste water to conform to the quality standard for waste water. Measuring pH is important in this process, too. For example, at a plating plant, treatment efficiency is greatly affected by pH of the processing solution when removing cyanide or chromium from waste water.
The pH is a measure of the acidity or alkalinity of water. Pure water has a
pH of 7, which is neutral; under 7 is acidic, above 7 is alkaline or basic.
Values of pH are based on the logarithmic scale, meaning that for each 1.0
change of pH, acidity changes by a factor of 10. Most marine organisms
prefer conditions with pH values ranging from about 6.5 to 8.5. Many species have trouble surviving if pH drops under 5.0 or rises above 9.0. The pH is affected by the level of bacterial activity, DO level, water turbulence and various chemicals in runoff flowing into the water.
Is Imbalanced pH Really Dangerous?
- Photo Finishing