COD(chemical oxygen demand)
  • HDCuHDCu July 2012
    Posts: 1,117
    As a backgrounder from wiki pedia

    In environmental chemistry, the chemical oxygen demand (COD) test is commonly used to indirectly measure the amount of organic compounds in water. Most applications of COD determine the amount of organic pollutants found in surface water (e.g. lakes and rivers) or wastewater, making COD a useful measure of water quality. It is expressed in milligrams per liter (mg/L), which indicates the mass of oxygen consumed per liter of solution. Older references may express the units as parts per million (ppm).

    I have been reading lately and encountered this statement,

    ‘It is known fact (among ZNA members in Japan) that COD (chemical oxygen demand) higher than 5 ppm cause not only typical diseases such as gill disease but also Hikui. the more higher COD rate, the more outbreak of Hikui.’

    My questions are:
    1. How true do you think is this statement?
    2. How can a hobbyist effective and affordably test a COD levels in their pond?

    Your thoughts??

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