Determination of trace NO<sub>2</sub><sup>-</sup> in municipal sewage by catalytic spectrophotometry

Tan Cuiying, Liao Yinyu, Yin Qide

doi:10.11894/1005-829x.2005.25(7).59

Industrial Water Treatment >

2005 , Vol. 25 >Issue 7: 59 - 60

DOI: https://doi.org/10.11894/1005-829x.2005.25(7).59

Determination of trace NO₂^- in municipal sewage by catalytic spectrophotometry

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1. Changsha Municipal Drainage Center, Changsha 410008, China;
2. Changsha Sewage Treatment Educational Training Center, Changsha 410008, China;
3. Department of Chemistry andEnvironmental Engineering, Changsha University of Science and Technology, Changsha 410076, China

Received date: 2005-02-20

Online published: 2010-10-01

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Abstract

Trace NO₂^- in H₃PO₄ solution has been studied. It catalyzes the decolorization reaction of neutral red (NR) by oxidizing H₂O₂ in H₃PO₄. Its catalytic extent is linear with the contents of NO₂^-. The results show that the maxium absorption wave length of the colored solution is 530 nm. and the detection limits of this method is 0.014 μg/L. When the catalysis degree and NO₂^- content are in the range of 0-0.080 mg/L, it accords with Beer′s Law. The appending recovery rate is 96.0%-106.0%. This method has high sensibility, good selectivity, quick analytical speed. When it is applied to the fast determination of trace NO₂^- in municiple sewage, satisfactory results have been obtained.

Key words： municipal sewage; catalytic spectrophotometry; nitrite; neutral red

Cite this article

Tan Cuiying, Liao Yinyu, Yin Qide . Determination of trace NO₂^- in municipal sewage by catalytic spectrophotometry[J]. Industrial Water Treatment, 2005 , 25(7) : 59 -60 . DOI: 10.11894/1005-829x.2005.25(7).59

References

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[2] 吴湘江, 刘骏, 廖雁, 等.催化褪色光度法测定环境水样中痕量亚硝酸根[J].化学世界, 2002, (11):570-571
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