# 查看完整版本 : 關於計算化學需氧量(COD)的問題

## 關於計算化學需氧量(COD)的問題

COD (as mg/L) = (A-B) x M x 8 x 1000 / sample volume

A = mL FAS used for blank
B = mL FAS used for sample
M = molarity of FAS

halola 2017-11-1 06:15 PM

8000 = milliequivalent weight of oxygen X 1000 mL/L.

[quote]原帖由 [i]halola[/i] 於 2017-11-1 06:15 PM 發表 [url=http://www.discuss.com.hk/redirect.php?goto=findpost&pid=470237244&ptid=27023009][img]http://www.discuss.com.hk/images/common/back.gif[/img][/url]
8000 = milliequivalent weight of oxygen X 1000 mL/L. [/quote]

APHA的確係咁寫，但點解係8呢?

halola 2017-11-1 10:53 PM

http://www.msdvetmanual.com/appendixes/reference-guides/milligram-milliequivalent-conversions-and-atomic-weights

[quote]原帖由 [i]halola[/i] 於 2017-11-1 10:53 PM 發表 [url=http://www.discuss.com.hk/redirect.php?goto=findpost&pid=470250917&ptid=27023009][img]http://www.discuss.com.hk/images/common/back.gif[/img][/url]
[url=http://www.msdvetmanual.com/appendixes/reference-guides/milligram-milliequivalent-conversions-and-atomic-weights]http://www.msdvetmanual.com/appendixes/reference-guides/milligram-milliequivalent-conversions-and-atomic-weights[/url] [/quote]

Thanks:victory: