Low level chlorine measurement.

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Low level chlorine measurement.

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01630545

Posted 4/17/2008 3:44:38 PM

Junior Member

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We chlorinate (Cl2 gas) and dechlorinate (SO2) seasonally for fecal control and we have a discharge permit limit of no more than 0.05 mg/L chlorine. Currently we measure the chlorine with an ORION residual chlorine ISE probe (replaced yearly) that always gives us calibration fits. The calibration is per CFR40 part136 with 0.2, 1.0, and 5.0 mg/L chlorine standards. The calibration takes forever, slope is nearly always 30 or above. The permit limit is way outside the calibration standards. Is there a better way to measure a next-to-nothing chlorine residual in dechlorinated effluent?

Thanks,

Gregg

Post #8926

rwhitworth52

Posted 4/17/2008 4:01:53 PM

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Amperometric titration (foreward or backward). Hach has an auto-cad 9000 that's nice but expensive (5K). Gives good repeatable results.

Bob Whitworth

Post #8930

Dvant

Posted 4/17/2008 5:04:49 PM

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Hach has an ultra low method that is EPA approved and is easy to use, Hach method 10014.

We figured there would be less error between operators with this method.

Mark

Post #8933

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