Kmno4

KMnO4 and cesium fluoride were purchased from Kanto Chemical (Tokyo). Alumina sol-200 and quartz sand were purchased from Nissan Chemical (Tokyo) and Tatsumori (Tokyo), respectively.
The detecting reagent in the detector tube was prepared as follows. One thousand grams of quartz sand (particle size 150 -180 μm) and 50 g of alumina sol-200 were mixed in a flask and heated in a hot water bath at 100°C and dried for 3 h under reduced pressure with a vacuum pump. After drying, the quartz sand and alumina sol-200 were heated in a furnace at 650°C for 4 h to activate the alumina and coat the quartz sand.
The quartz sand coated with activated alumina was mixed with 48 mg of KMnO4 that was dissolved in 35 mL of deionized water in a flask. The mix was heated in a hot water bath at 80°C and dried under reduced pressure with a vacuum pump for several hours. After leaving the flask at room temperature to cool, the purple colored detecting reagent was formed.
The dehumidifying reagent was prepared by mixing 1500 g quartz sand (particle size 180 -250 μm) and 300 g cesium fluoride, which had been dissolved in 150 mL of deionized water, in a flask. It was heated on a mantle heater at 250°C. After leaving the flask at room temperature, it was dried under reduced pressure with a vacuum pump for 30 min. After that, the white colored dehumidifying reagent was formed.