Development of a Chromium-free Gas Detector Tube for Alcohols.

Chromium oxide(VI), (Cr(VI)) has been used in gas detector tubes as an indicator to detect alcohols. However, it is toxic and regulated to prevent environmental pollution. In this report, potassium manganate(VII) was chosen instead of Cr(VI).

Development of a measurement method to determine the ceiling exposure concentration of ortho-phthalaldehyde handling workers.

Objectives: The purpose of this research was to develop and validate an analytical method for rapid determination of the exposure of workers to ortho-phthalaldehyde (OPA) at the ceiling threshold concentration.

Methods: A 2,4-dinitrophenylhydrazine (DNPH)-silica cartridge was chosen as a sampler. OPA collected by the DNPH-silica cartridge was subsequently extracted with 5 mL of acetonitrile.