Humidity indicators

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2005-08-09

2005-08-09

Wallenhorst, Maureen M. (Department: 1743)

Chemistry: analytical and immunological testing

Determination of water

C436S084000, C436S164000, C436S166000, C436S169000, C422S051000, C422S051000, C073S029010, C073S029040

Reexamination Certificate

active

06927063

ABSTRACT:
Silica-based carrier impregnated with iron(III) or iron(II) salts functions as a humidity indicator giving a yellow/amber to nearly colourless colour change as the carrier humidifies.

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Lopez, T. et al. “Spectroscopic study if sol-gel silica dropped with iron ions”Materials Chemicals and Physics30:3 (Jan., 1992) pp. 161-167.
Belotserkovskaya, N.G. et al. “Indicator properties of cobalt silica gels obtained by introduction of cobalt salts into silica sols and silica gels”Russian Journal of Applied Chemistry62:10(1)(Oct. 1, 1989) pp. 2030-2040.

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