An osmium (Ⅷ) oxide solution that had been used for sample preparation for electron microscopy was processed by ozonation and then treated with a 0.1 mol/L solution of sodium hydroxide. An apparatus was assembled such that a systemic series of mechanical and chemical operations was performed to regenerate osmium (Ⅷ) oxide. By optimizing the operating parameters of the apparatus, a solution with osmium (Ⅷ) oxide content of 2.0%(w/v) or higher was produced. The generated osmium (Ⅷ) oxide was found to be reusable for sample preparation for electron microscopy.
To obtain information on chemical reagent behavior in a laboratory environment, the time and place of chemical usage was analyzed through a case study approach. A Radio Frequency Identification system and web cameras were used for collecting data from checkout logs of reagents in storage and for monitoring chemical bottle traffic. Checkout duration was generally classified into two groups: short duration (10 minutes or shorter), and long duration (longer than 30 minutes). Reagents with estimable pre-experiment amounts tend to belong to the short duration group.Refrigerated reagents or those with process-dependent amounts belong to the long duration group. Usage location refers to where reagents are used within the experiment location such as near a balance or in a fume hood. It was discovered that the lab bench often functions as a hub before and after moving to another task location. Observations suggest that each reagent is used only at one location for each checkout from storage. In addition, though the usage location is generally determined by experiment task, other factors sometimes affect reagent usage location: easy accessibility, equipment location, and shared nature of a laboratory to name a few. Some information on the behavior of chemical reagents in a real laboratory proves unobtainable by conventional chemical inventory system methods. This research not only elucidates the characteristics of reagent use in a laboratory but also provides useful knowledge for experiment setup scenarios essential for assessing risk of instability in experiments.
With the nationwide spread of tourist attractions like campgrounds, recreational fishing, and fish farming, there are concerns over environmental degradation of rivers. This research has used the AGP (Algal Growth Potential) test to conduct studies on reservoir algae (Microcystis aeruginosa) proliferation testing, caused by fish farming, and artificial fishing bait (paste bait). The following conclusions were as follows. Artificial fishing bait (paste bait) greatly associates with the proliferation of Microcystis aeruginosa. In the algae proliferation testing using river water sampling, it was thought that releasing fishing bait into reservoirs was the cause of the eutrophication phenomenon.
The several synthetic fragrance materials are widely used as personal care products. Because of its lipophilic property, they have a possibility to accumulate in living animals. There are a few reports about the information regarding their potential impacts on humans and the environment (especially the aquatic environment).In this study, we have investigated about the removing and discharge of the synthetic polycyclic musk compounds,such as 6-acetyl-1,1,2,4,4,7-hexamethyltetraline (AHTN) and 1,3,4,6,7,8-hexahydoro-4,6,6,7,8-hexamethylcyclopenta-?-2-benzopyran (HHCB), HHCB related compound (HHCB-lactone), [1,2,3,4,5,6,7,8-octahydro-2,3,8,8,-tetramethylnaphtalen2yl] ethan-1-one (OTNE) in sewage treatment plant (STP).As the results, we have identified AHTN 2.3 µg/L, HHCB 4.8 µg/L and HHCB-lactone 1.2 µg/L and OTNE 5.4 µg/L in influent water into the STP. On the other hand, the concentration of AHTN 0.7 µg/L, HHCB 0.9 µg/L and HHCB-lactone 0.9 µg/L and OTNE 0.7 µg/L were detected in effluent water from STP.Their concentrations in sewage biosolids were detected in AHTN 2.1~9.3 mg/kg, HHCB 3.9~11.7 mg/kg, HHCB-lactone 1.8~3.4 mg/kg and OTNE 2.0~9.3 mg/kg.Although the concentration of AHTN, HHCB and OTNE in sewage biosolid was decreased during their treatment process, the level of HHCB-lactone was almost same. This means that HHCB-lactone is derived from HHCB during treatment process in STP.In this study, it is revealed that the 60% of influent volume of PCMs is discharged into effluent water and adsorption by sewage biosolids, and their removal ratio by biodegradation is 40%.
Recently, the recycling on the increasing organic waste and its application such as the utilizing to resources to the green field and compost manure are great concern. The composting of sewage biosoilds must be continued to increase.On the other hand, it was reported that the higher level of synthetic fragrance materials, which are widely used as personal care products, was detected in the sewage biosoilds.The present study, we have investigated the persistent of synthetic fragrance materials, such as 7-acetyl-1,1,3,4,4,6-hexamethyl- tetrahydro naphthalene (AHTN) and 1,3,4,6,7,8-hexahydro-4,6,6,7,8,8- hexamethyl-cyclopenta-?-2-benzopyrane (HHCB), HHCB related compound (HHCB-lactone) and [1,2,3,4,5,6,7,8-octahydro-2,3,8,8- tetramethylnaphtalen 2yl] ethan -1-one (OTNE) in compost manure.As the results, we have identified ND ~ 5.3mg AHTN/kg, ND ~ 4.2mg HHCB /kg, ND ~ 14.2mg HHCB lactone /kg and ND ~ 2.1mg OTNE/kg in compost samples from sewerage biosolids.In this study, it is revealed that the higher level of synthetic fragrance materials such as AHTN, HHCB, HHCBLactone and OTNE still contained in the compost manure from sewage biosoilds.It means that the synthetic fragrance materials related compounds do not remove though-out the manufacturing process. It is concern that the recycle usage of the compost manure by sewage biosolids may cause an additional pollution of soil by the synthetic fragrance materials related compounds.
Universities keep various kinds of chemicals for their researches; therefore the fire or explosion of these chemicals would cause not only the damage of buildings but also enormous amount of anxiety and troubles to the residences around the campus. Many of current fires happened due to inadequate usage of toxic/poisonous usage in university/institute. The safety management in university is closely related to the social responsibility of the university,compliance, disclosure, social media etc. which composes of “Trust Bridge” between stakeholder and the university.Also, the education of the next generation of the student on the safety and health management is important as the social responsibility of the university. We also had serious fire/explosion accidents with color laser machine happened in this campus last year. In order to avoid such accidents, we established a new rule for the risky material management system to prevent the laboratory fire/explosion accidents. This paper focuses on the importance of the recovery of the “Trust Bridge” after the laboratory fire has occurred to the university, and describes how we can practically recover it.