Silica gel adsorbents for sampling tube in work environment measurements and their extraction efficiency of alcohols

Extraction efficiency of alcohols from activated carbon and silica gel sampling agents in the low concentration region

“…When measuring the extraction efficiencies of organic solvent components from adsorbent specimens, it is difficult to achieve sufficient accuracy and repeatability in the preparation and handling of rarefied organic vapors at a few ppm levels as standard samples. Therefore, as established by the Industrial Safety and Health Act in Japan, in many cases of work environment measurements, extraction efficiencies are measured by the use of only a liquid sample and solid-state adsorbents through two representative methods; direct addition and phase equilibrium methods [9,[17][18][19][20]. The schematics of both measurement methods are presented in Supplementary Fig.…”

“…In this study, we aim to clarify the difference and relative merits of each method. Previously [17][18][19], we studied the relation between the material properties and organic solvent extraction efficiency characteristics when determined by the phase equilibrium method. We collected activated carbon and silica gel adsorbents used in typical commercially available sampling tube products in Japan as samples.…”

“…We collected activated carbon and silica gel adsorbents used in typical commercially available sampling tube products in Japan as samples. Then, we investigated the physical and chemical properties of the activated carbon and silica gel specimens according to the methods described in previous reports [17][18][19]. Based on the results, this study was performed using the activated carbon and silica gel specimens, which showed the most preferable results in the previous studies (activated carbon samples F and G [17], and silica gel sample D [19]).…”

“…This method for measuring the organic vapor concentration in air using solvent extraction is called "the solid collection method." Conventional activated carbon and silica gel SiO 2 ⋅ nH 2 O adsorbents are typical sampling agents used in sampling tube products [10][11][12][13][14][15][16][17][18][19][20][21][22] for this method. In the current market, other materials for preconcentration are expensive and not effective in work environment measurements compared with these two types of adsorbents.…”

“…In the current market, other materials for preconcentration are expensive and not effective in work environment measurements compared with these two types of adsorbents. The extraction efficiency of the organic solvent components is a very important factor for the accuracy of the determination [11][12][13][14][15][16][17][18][19][20][21][22][23][24]. It is desirable to figure out the efficiency before work environment measurements by the solid collection method.…”