能性物質 1) に分類している。スチレンに関する室内 濃度指針値として世界保健機関 (WHO) は2 6 0 ・ g / m 3 (0. 0 6 p p m) 2) ，厚生労働省は2 2 0 ・ g / m 3 (0. 0 5 p p m) 3) を勧

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Standard gases are often prepared using high-pressure gas cylinders. However, it is difficult to accurately prepare a known concentration of hydrogen chloride (HCl) gas using this method because HCl is highly corrosive and adsorptive. In this study, a simple method for the continuous generation of HCl gas was developed using a diffusion tube containing hydrochloric acid and a nitrogen carrier gas. The concentration of HCl produced from this system was almost unstable, but constant gas generation was realized for several hours when azeotropic hydrochloric acid (20.6% HCl in water) and a temperature near the azeotropic point (108.5 °C) were used, resulting in the generation of 103.6 ppm (mean, n = 5) of HCl gas with a relative standard deviation (RSD) of 2.34%. In this case, the percentage of HCl present in the entire gas mixture of HCl and water vapor was 22.5%, which is almost equivalent to the HCl content in the azeotropic hydrochloric acid (20.6%). The HCl concentration could also be controlled by changing the flow rate of the carrier gas. This work demonstrates a simple technique based on the diffusion theory that allows for the constant, controllable generation of a known concentration of HCl gas using an azeotropic hydrochloric acid system.

De v e l o p me n t o f d e t e r mi n a t i o nme t h o df o rn i t r o g e nd i o x i d ei ni n d o o ra i r u s i n gh i g hp e r f o r ma n c el i q u i dc h r o ma t o g r a p h y Ko u s u k eB AB A 1) Ai NAKAMUR A 2) , T o s h i r oMAT S UMUR A 1) , Yu k i t o k i MOR I T A 1) , Ku n i t o s h i MAT S UNOB U 2) a n dT o mo mi YOS HI NO 2) 1) De p a r t me n t o f Ma t e r i a l sa n dAp p l i e dC h e mi s t r y , C o l l e g eo f S c i e n c ea n dT e c h n o l o g y , Ni h o nUn i v e r s i t y , 1-5-1 , Ka n d a s u r u g a d a i , C h i y o d a-k u , T o k y o , 1 0 1-8 3 0 8J a p a n 2) Ga s t e cC o r p o r a t i o n , 8-8-6 , F u k a y a n a k a , Ay a s e , Ka n a g a wa , 2 5 2-1 1 9 5J a p a n Ke ywo r d s :二酸化窒素 (Ni t r o g e nd i o x i d e) ,室内空気 (I n d o o ra i r) ,アクティブサンプラー