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[ Last edited by y-23 on 2011-6-14 at 21:03 ]
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kanavaro11(½ð±Ò+1): »ý¼« 2011-06-16 20:06:11
y-23(½ð±Ò+1): 2011-06-16 21:47:48
I doubt your COD machine's accuracy at high COD level.
You can calibrate it by using standard COD solutions around 500 ppm.
The Standard COD solution can be made by white sugar. Since sugar is a kind of carbohydrate, so 1 gram of sugar equals 12/(12+18)=0.4 gram carbon. One carbon needs 2 oxygen to oxidize. Thus on gram white sugar equals 0.4*32/12 = 1.07 gram COD.

So if you dissolve 0.5 gram white sugar into distilled water, you can get a 504 ppm standard COD solution.
9Â¥2011-06-16 19:59:07
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kanavaro11(½ð±Ò+1): »ý¼« 2011-06-14 21:44:31
y-23(½ð±Ò+1): 2011-06-14 23:15:37
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2Â¥2011-06-14 21:38:41
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y-23(½ð±Ò+1): 2011-06-14 23:17:59
stormxuhao(½ð±Ò+1): »ý¼«Ó¦Öú 2011-06-15 08:54:32
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stormxuhao(½ð±Ò+1): »ý¼«Ó¦Öú 2011-06-15 08:54:42
y-23(½ð±Ò+1): 2011-06-16 21:48:02
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