Hygienic chemical Studies on Public Nuisance by Injurious Gases. (VII) : Methods for Evaluation of Detector Tubes. (No. 3) Nitrogen Dioxide, Sulfur Dioxide, Hydrogen Sulfide, Chlorine, Ammonia and Carbon Dioxide.

Abstract

This report deals with the methods of preparation and standard evaluation of some sample of gases, such as NO₂, SO₂, H₂S, Cl₂, NH₃ and CO₂ that can not be prepared by use of their vapor pressure. As the standard method, diazotizing method for NO₂, p-rosaniline formaldehyde method for SO₂, methyleneblue method for H₂S, o-tolidine method for Cl₂, Nessler method for NH₃ and barium hydroxide method for CO₂ were adopted. The results obtained from the present standard evaluation method were in good accordance with those obtained from the experiment using Kitagawa's detector tubes, and the evaluated values did not vary with the lot number of detector tubes.