Constituent Mineral and Water-Soluble Components of Volcanic Ash from the 2018 Eruption of Mt. Motoshirane of Kusatsu-Shirane Volcano, Japan

Constituent minerals and water-soluble components of the volcanic ash discharged from the eruption of Mt. Motoshirane on January 23, 2018, were analyzed to investigate the source environment of this eruption. The ash sample included quartz, plagioclase, cristobalite, pyrite, alunite, kaolinite, and pyrophyllite; its mineral assemblage suggests that a high-temperature acid alteration zone had been formed in the volcanic edifice of Mt. Motoshirane. The presence of pyrophyllite in the ash sample indicates that the explosion of this eruption took place at a depth reaching the basement rocks of Mt. Motoshirane. Further, the adhesion amount of water-soluble components detected from the ash sample is smaller than that in the ashes from the 1982 eruption of Mt. Shirane, indicating that the ash discharge of the 2018 eruption of Mt. Motoshirane took place in a condition in which the degree of involvement of the liquid phase was relatively small.

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Air-Fall Ash from the Main Crater of Asama Volcano on August 7, 2019, and its Water-Soluble Components

Journal of Disaster Research ◽

10.20965/jdr.2020.p0053 ◽

2020 ◽

Vol 15 (1) ◽

pp. 53-56

Author(s):

Muga Yaguchi ◽

Akihiko Terada ◽

Yasuo Ogawa ◽

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Keyword(s):

Volcanic Ash ◽

Volcanic Edifice ◽

Water Soluble ◽

Asama Volcano ◽

Phreatic Explosion ◽

Main Crater ◽

Soluble Components

We collected volcanic ash immediately following the eruption of Mt. Asama on August 7, 2019, observed the characteristics of ash particles, and analyzed the water-soluble components. The volcanic ash consisted mostly of altered fragments, and no clear evidence of essential materials was found. The volcanic ash contained large amounts of water-soluble components, Cl and SO4 at concentrations of 8,710 mg/kg and 49,100 mg/kg, respectively. These results indicate that this eruption was caused by the phreatic explosion and that part of the volcanic edifice of Mt. Asama was fractured and emitted.

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Temporal variations in the constituents of volcanic ash and adherent water-soluble components in the Unzen Fugendake eruption during 1990–1991

Earth Planets and Space ◽

10.1186/bf03352400 ◽

2001 ◽

Vol 53 (7) ◽

pp. 723-730 ◽

Cited By ~ 13

Author(s):

Kenji Nogami ◽

Jun-ichi Hirabayashi ◽

Takeshi Ohba ◽

Joyo Ossaka ◽

Masahiro Yamamoto ◽

...

Keyword(s):

Volcanic Ash ◽

Temporal Variations ◽

Water Soluble ◽

Soluble Components

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INFLUENCE OF FORCED CONVECTION IN LIQUID INSIDE THE TIN ON DURATION OF STERILIZATION IN THE COURSE OF FISH PROCESSING

VESTNIK OF ASTRAKHAN STATE TECHNICAL UNIVERSITY SERIES FISHING INDUSTRY ◽

10.24143/2073-5529-2017-1-137-144 ◽

2017 ◽

pp. 137-144

Author(s):

Gennadiy Valentinovich Alexeev ◽

Elena Igorevna Verboloz

Keyword(s):

High Temperature ◽

Liquid Phase ◽

Forced Convection ◽

Thermal Process ◽

Processing Time ◽

Fish Processing ◽

Study Results ◽

Equipment Modernization ◽

Bottom To Top

The article focuses on the process of intensive mixing of liquid phase in the tin during high-temperature sterilization, i.e. sterilization when temperature of the heat carrier reaches 150-160°C. It has been stated that for intensification of the thermal process during sterilization of tinned fish with liquid filling it is preferable to turn a tin from bottom to top. This operation helps to increase the driving power of the process and to shorten warming time. Besides, high-temperature sterilization carried out according to experimental modes, where the number of tin turnovers is calculated, greatly shortens processing time and improves quality of the product. In this case there is no superheating, all tins are evenly heated. The study results will contribute to equipment modernization and to preserving valuable food qualities.

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The Potential Migrated Mechanism of Water-Soluble Components in Pellets Prepared by Wet Extrusion/Spheronization: Effect of Drying Rate

Current Drug Delivery ◽

10.2174/1567201817666201124113741 ◽

2020 ◽

Vol 17 ◽

Author(s):

Bingwei Wang ◽

Jianping Liu ◽

Zhenghua Li ◽

Yulong Xia ◽

Shuangshuang Zhang ◽

...

Keyword(s):

Relative Humidity ◽

Water Soluble ◽

In Vitro Dissolution ◽

Drying Rate ◽

Scanning Calorimetry ◽

Drying Temperature ◽

Wet Extrusion ◽

Extrusion Spheronization ◽

Soluble Components

Background: At present, there were numerous researches on the migration of components in tablets and granules, the investigation in the pharmaceutical literatrue concerning the effect of drying rate on the migration of water-soluble components of pellets was limited. Temperature and relative humidity (RH) were crucial parameters during the drying process which was an essential step in the preparation of pellets via wet extrusion/spheronization. To quantify these variables, the water loss percentage of pellets per minute was defined as drying rate. Objective: The study aimed to investigate the influence of drying rate on the migration of water-soluble components in wet pellets and the potential migrated mechanism. Methods: The pellets containing tartrazine as a water-soluble model drug and microcrystalline cellulose as a matrix former were prepared by extrusion/spheronization and dried at four different drying temperature and relative humidity. Afterward, the extent of migrated tartrazine was assessed regarding appearance, in-vitro dissolution test, Differential Scanning Calorimetry, X-Ray Powder Diffraction, Attenuated total reflectance Fourier transform infrared spectroscopy and Confocal Raman Mapping. Results: Results demonstrated that red spots of tartrazine appeared on the surface of pellets and more than 40% tartrazine were burst released within 5 minutes when pellets dried at 60℃/RH 10%. While pellets dried at 40℃/RH 80%, none of these aforementioned phenomena was observed. Conclusion: In conclusion, the faster drying rate was, the more tartrazine migrated to the exterior of pellets. Adjusting drying temperature and relative humidity appropriately could inhibit the migration of water-soluble components within wet extrusion/spheronization pellets.

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