Abstract
The gauze collecting methods were investigated which are regulated by JIS and/or ISO for salinity measurement. The ratios of Cl- to Na+ collected on the exposed gauze were 3 times(JIS) or 5 times(ISO) excess of Cl- present in the average more than the composition of sea salts. The large Cl- was detectd on the gauzes of JIS and/or ISO methods covered with Teflon filters. The relation between the concentration of coarseCl- particles ( >2.1 μm) and Cl- on the exposed gauze was not correlative . It was found that the dry and wet gauzes collect gaseous HCl at high efficiency . Under a high wind, the gauze method regulated by JIS collected some fine Cl- particles( <2 .1 μm) too. One by ISO collected a little. The relation between the concentration of coarse Nay particles and Na+ on the exposed gauze showed a relatively good linear correla tion. Consequently, the gauze collection methos were influenced considerably by gaseous HCl and fine Cl- particles. It is more proper to estimate the amount of NaCI from Na+ instead of Cl- collected on the gauze. The amount of salinity in the atmosphere tended to decrese almost exponentially with increasing distance and reduced by a half at 6-8 km distance from the seashore in south Osaka.
