Do’s and Don’ts in Providing for Storage of Chemical Wastes in the Laboratory

2018 ◽  
pp. 69-74
Author(s):  
Peter Ashbrook
Keyword(s):  
Chemical Wastes

Scanning Electron Microscopy and x-ray analysis of microparticles and early hydration effects

1995 ◽  
Vol 53 ◽  
pp. 692-693
Author(s):  
Yun Lu ◽  
David C. Joy
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
High Resolution ◽  
Morphological Development ◽  
Early Hydration ◽  
X Ray ◽  
Blended Cements ◽  
Powder Particles ◽  
Chemical Wastes ◽  
Scanning Electron

High resolution scanning electron microscopy (SEM) and energy dispersive x-ray analysis (EDXA) were performed to investigate microparticles in blended cements and their hydration products containing sodium-rich chemical wastes. The physical appearance of powder particles and the morphological development at different hydration stages were characterized by using high resolution SEM Hitachi S-900 and by SEM S-800 with a EDX spectrometer. Microparticles were dispersed on the sample holder and glued by 1% palomino solution. Hydrated bulk samples were dehydrated by acetone and mounted on the holder by silver paste. Both fracture surfaces and flat cutting sections of hydrating samples were prepared and examined. Some specimens were coated with an 3 nm thick Au-Pd or Cr layer to provide good conducting surfaces. For high resolution SEM S-900 observations the accelerating voltage of electrons was 1-2 KeV to protect the electron charging. Microchemical analyses were carried out by S800/EDS equipped with a LINK detector of take-off angle =40°.

Tested disposal methods for chemical wastes from academic laboratories

1985 ◽  
Vol 62 (3) ◽  
pp. A93 ◽  
Author(s):  
M. A. Armour ◽  
L. M. Browne ◽  
G. L. Weir
Keyword(s):  
Chemical Wastes

scholarly journals Anthropic Radioactive Pollution in Romania

2019 ◽  
Vol 25 (3) ◽  
pp. 185-189
Author(s):  
Ioan Zaharie ◽  
Mircea Goloşie
Keyword(s):  
Heavy Metals ◽  
Radioactive Waste ◽  
Food Contamination ◽  
Abandoned Mines ◽  
Contaminated Sites ◽  
Radioactive Pollution ◽  
Radioactive Materials ◽  
Mining Areas ◽  
Industrial Buildings ◽  
Chemical Wastes

Abstract The paper presents some conclusions regarding the identification, processing and monitoring of sites contaminated with heavy and radioactive metals. The following categories of sites have been researched: abandoned mining areas, industrial perimeters for the processing of alloys containing radioactive metals, chemical wastes from the chemical fertilizer industry, railways and run- ways that serve to locate radioactive ores, military sites with forgotten radioactive waste, abandoned mines in which chemical and radioactive materials have been deposited, civil and industrial buildings where radioactive materials were used, tourist resorts affected by anthropic and entropic pollution, cases of radioactive floods and heavy metals from food, contamination of external geographic causes. The research includes the results related to the identification, processing and monitoring of the data of more than 350 contaminated sites.

scholarly journals A short review of titania-graphene oxide based composites as a photocatalysts

2021 ◽  
Vol 10 (2) ◽  
pp. 51-60
Author(s):  
Katarina Stepić ◽  
Radomir Ljupković ◽  
Jovana Ickovski ◽  
Aleksandra Zarubica
Keyword(s):  
Graphene Oxide ◽  
Water Purification ◽  
Organic Contaminants ◽  
Environmental Pollutants ◽  
Short Review ◽  
Sorption Process ◽  
Water Disinfection ◽  
Co Catalysts ◽  
Photocatalytic Reactions ◽  
Chemical Wastes

New and effective methods of water purification are necessary to minimize pollution. Many methods have been used in wastewater treatment, but sorption is considered as an easy and economic process. The efficiency of any sorption process mainly depends on the physicochemical properties of the used adsorbent. Since photocatalysts can initiate reactions of decomposition organic contaminants under ultraviolet or sunlight irradiation without using chemicals or producing chemical wastes, photocatalytic reactions are considered a sustainable way to remove a variety of environmental pollutants. Ultraviolet water purification became the most effective method of water disinfection and purification. Heterogeneous semiconductor photocatalysts have recently emerged as an efficient material for purifying water. The crystal structure is crucial for photocatalytic activity and efficiency of semiconductors, thus optimal parameters must be provided during the preparation of photocatalysts. To overcome problems with semiconductors usage, the use of co-catalysts and photocatalyst carriers is one of the solutions. Recently, much emphasis has been placed on using graphene oxide (GO) supported semiconductor photocatalysts. In this paper, a short review of composites of titanium dioxide and graphene oxide-based materials is given.

scholarly journals Toxic Chemical Wastes

1980 ◽  
Vol 8 (4) ◽  
pp. 15-15 ◽  
Author(s):  
Gregory T. Halbert
Keyword(s):  
Toxic Chemical ◽  
Chemical Wastes

Minimizing laboratory waste and improving material reuse through chemical waste exchange: Case of a Brazilian institution

2020 ◽  
Vol 38 (9) ◽  
pp. 1064-1072
Author(s):  
Fabiana Cristina Lima Barbosa ◽  
Marcos Paulo Gomes Mol ◽  
Raphael Tobias de Vasconcelos Barros
Keyword(s):  
Raw Material ◽  
Added Value ◽  
Chemical Waste ◽  
Waste Reuse ◽  
Final Destination ◽  
Chemical Reagents ◽  
Significant Difference ◽  
Waste Exchange ◽  
Laboratory Waste ◽  
Chemical Wastes

Concern over the management of chemical wastes from laboratories has been gaining importance since the 1990s. For a good management of chemical wastes generated from laboratories, it is recommended that managers encourage an environment of cooperation and exchange, thus reusing chemical reagents. The institution under study implemented the Chemical Waste Exchange, whose objective is to capture reagents past their expiry dates that would be discarded and make them available internally to other areas or even to other institutions. A total of 1075 reagents were reused internally and 4382 items were donated for external institutions. As for financial data, between 2011 and 2018, the internal economy was US$16,700.70 and for external institutions it was US$62,633.11. When comparing the waste reuse according to the destination, an internal address showed a significant difference when compared with the external use. Some categories of reagents have greater added value and provide even greater benefits when reused. The strategy of capturing and making available expired reagents through the Chemical Waste Exchange is positive; it helps the management of the waste generated; the economic benefit will depend on the market value of the material; the adopted strategy avoids the need to remove raw material from nature for the production of new reagents and reduces the costs related to treatment and environmentally appropriate final destination.

Sign in / Sign up

Export Citation Format

Share Document