Determination of gaseous hydrogen peroxide at parts per trillion levels a Nafion membrane scrubber and a single-line flow-injection system
✍ Scribed by Genfa Zhang; Purnendu K. Dasgupta; Andreas Sigg
- Publisher
- Elsevier Science
- Year
- 1992
- Tongue
- English
- Weight
- 672 KB
- Volume
- 260
- Category
- Article
- ISSN
- 0003-2670
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✦ Synopsis
AbStNCt
Gaseous hydrogen peroxide was collected continuously with a high efficiency Nafion membrane diffusion scrubber. An ammoniacal solution of a peroxidase-like catalyst, hematin, was pumped through a porous hydrophob membrane reactor that allowed the introduction of a substrate, p-cresol. The mixed hematin-p-cresol solution w J then pumped through the scrubber. The HsO, reaction product, 2,2'-dihydroxy-4,4'-dimethylbiphenyl, was monitored fluorimetrically, with a detection limit of 5 X 10-r' atm H,O,(g). The system response exhibited excellent linearity over the range of ambient concentrations, 0-10-s atm. Reproducibility at typical ambient concentrations was ca. 2% in R.S.D.