酸洗排水中硝酸イオン濃度の連続測定システム

抄録

A new system for continuous measurement of concentration of NO₃^- in the waste water discharged when stainless steel sheets are treated in pickling bath has been developed. This system is based on the principle that NO₃^- is measured at 302 nm in the ultra violet region after the co-existing iron ion is eliminated as iron hydroxide. The measurement of NO₃^-in the proposed system is performed as follows: The waste water sample from the neutralization treatment bath is continuously filtered by a newly developed device and some hydroxide precipitates like iron hydroxide are removed. Then the sample is constantly passed through a debubbling device to flow-cell of an ultra violet monitor, and the absorbance of the sample is continuously measured at 302nm. Accuracy and responsibility of this system were good. This system was found to be suitable to continuous measueement of NO₃^- in pickling waste water.