Determination of BOD is very important in assessing water excellent mainly because it provides facts regarding the pollution in water by organic make a difference. Higher BOD values display the higher organic issue dissolved in water that decreases the dissolved oxygen value within the water human body and harms the aquatic existence.
採水により水とともに当然採取されるその水域の微生物の活動による酸素消費を計測することで、一定時間外部から酸素供給がなされない場合に、その河川水の溶存酸素がどこまで減少するかを指標化した。
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After this time, the 2nd bottle is tested for dissolved oxygen using the similar method that was useful for the 1st bottle. The BOD i s expressed in milligrams per liter of DO utilizing the following equation:
Your sample really should be within just 0.5 mg/L. If It's not necessarily, repeat the Verify and if there is still an error, Verify the meter's batteries and Adhere to the troubleshooting procedures while in the manufacturer's manual.
DO amounts fluctuate seasonally and about a 24-hour interval. They vary with water temperature and altitude. Chilly water holds additional oxygen than heat water (Desk 5.3) and water holds much less oxygen at higher altitudes. Thermal discharges, for instance water accustomed to interesting machinery within a production plant or an influence plant, raise the temperature of water and lessen its oxygen content material.
Việc thử nghiệm chỉ số BOD là phép đo tốc độ hấp thụ hết oxy của vi sinh vật có trong mẫu nước thử ở nhiệt độ cố định (20 °C - mẫu thử nghiệm được đặt trong tủ read more ủ giống như tủ lạnh) và trong một khoảng thời gian chọn trước (thường là five ngày) trong bóng tối. Để đảm bảo mọi điều kiện là tương đương, một lượng rất nhỏ vi sinh vật mầm mống được thêm vào trong mỗi mẫu cần thử nghiệm cũng như trong một mẫu đối chứng chỉ chứa nước cất.
This signifies the quantity of oxygen eaten by microorganisms to break down the organic make a difference existing while in the sample through the incubation interval.
A test is used to measure the amount of oxygen eaten by these organisms for the duration of a specified length of time (normally 5 days here at twenty C). The rate of oxygen usage within a stream is afflicted by several variables: temperature, pH, the existence of particular varieties of microorganisms, and the type of natural and inorganic product from the water.
Few substances have an impact on the BOD of drinking water. Just one of such is phosphate, which boosts the BOD of water when present in significant concentrations.
Transfer the sample right into a 250-mL Erlenmeyer flask, and area the flask on the magnetic stirrer having a stir bar. If you are in the sphere, you'll be able to manually swirl the flask to mix.
BOD về chức năng là tương tự như nhu cầu oxy hóa học (COD) ở chỗ cả hai đều đo lượng các chất hữu cơ có trong nước.
Notice the burette reading through soon after instantly titrating with 0.025N sodium thiosulfate Remedy utilizing a starch indicator until eventually the blue hue fades.
圧力法：二酸化炭素吸収剤を設置した密閉容器を使用する。圧力変化から酸素消費を測定するため、途中経過から分解速度を知ることもできる