Determination of gaseous and particulate chloride and fluoride in the atmosphere

Abstract

The measurement of gaseous and particulate chloride and fluoride in the atmosphere was accomplished using a combination of a Millipore filter and a sodium carbonate impregnated filter. The sampling flow rate was about 201 min-1, and the Millipore pre-filter was heated during the sampling. The measurements in many places in Japan and Manila, Philippines, indicate that the gaseous chloride concentration is high at the coast and on mountains, but the sources of gaseous chloride still remain obscure. The samplings of fluoride revealed that near and in an aluminum refining plant the precentage of particulate component is higher than that of the gaseous component. © 1974.