✦ LIBER ✦

Improved titanium method for determination of atmospheric H2O2

✍ Scribed by Massimiliano Possanzini; Vincenzo Di Palo

Publisher: Elsevier Science
Year: 1995
Tongue: English
Weight: 494 KB
Volume: 315
Category: Article
ISSN: 0003-2670
DOI: 10.1016/0003-2670(95)00255-x

No coin nor oath required. For personal study only.

✦ Synopsis

Gaseous H,O, is sampled on a Ti(IV)-H,SO, coated filter, where titanium peroxy complex is formed. After sampling the filter is leached in a phosphate buffer (pH 7) and the peroxide concentration analysed spectrophotometrically at 505 nm after having added 4-(2-pyridylazohesorcinol (PAR). The triple complex formed shows an extinction coefficient (3.5 X lo4 1 mol-' cm-') about 2.5 times higher than that of the [FeNCS]'+ complex, which is formed when the titanium complex is broken by addition of ferrous thiocyanate reagent. The detection limit of H,O, for l-h sampling can be lowered to 0.03 ppb when this new reagent is used.

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