my.chemeurope.com
With an accout for my.chemeurope.com you can always see everything at a glance – and you can configure your own website and individual newsletter.
Water content variation of candidate p-n-heptylphenol (HP) reference material (ampoule form) for preparation of a primary standard solution based on the Japan Calibration Service System, a national standards dissemination system, under the Measurement Law of Japan, was examined by a Karl-Fischer water content meter. As prepared samples, liquid-phase HP and upper, middle, and lower layers of solid-phase HP were measured since characteristic phase transition occurs near room temperature (melting point: 28.98 °C). As a result of water content in liquid- and solid-phase HP, water content variation among three layers of solid-phase is found in within ampoules, though water content variation of liquid-phase is not found. Between-ampoule variation of water content is also found using total ampoules of liquid-phase HP used to eliminate within-ampoule variation. Moreover, water content variation is secondarily confirmed by the results of the amount-of-substance fraction of HP based on a differential scanning calorimeter. From these results in this study, it is concluded that within- and between-ampoule variations of water content may depend on phase transition and water loss during ampouling of candidate reference material, respectively.
| Authors: | Nobuyasu Hanari, Ryoko Iwasawa, Satoko Otsuka, Naomi Fujiki, Ayako Matsumoto, Toshihide Ihara, Keiichiro Ishikawa, Takashi Yarita | |
| Journal: | Accreditation and Quality Assurance: Journal for Quality, Comparability and Reliability in Chemical Measurement | |
| Year: | 2010 | |
| DOI: | 10.1007/s00769-010-0714-5 | |
| Publication date: | 20-Nov-2010 |
Nematicidal activity of essential oils: a review
Plant parasitic nematodes are the most destructive group of plant pathogens worldwide and their control is extremely challenging. Plant Essential oils (EOs) and their constituents have a great potential in nematode control since they can be developed for use as nematicides themselves or can ... more
For over a century, ulcer has been a major cause of morbidity and mortality. Its treatment has progressed from vagotomy to proton pump inhibitors. However, the drugs used produce many adverse effects and are less effective than they ought to be. Therefore, there is a growing interest in alt ... more
Endophytic fungi from medicinal plants: a treasure hunt for bioactive metabolites
Endophytic fungi are ubiquitous organisms found in the plants, residing intercellular or intracellular, at least for a portion of their lives without causing apparent symptoms of infection. Almost all plants are known to harbor endophytes. The choice of the plant to be used for exploring en ... more
First machine-generated chemistry book published
Springer Nature published its first machine-generated book, compiled using an algorithm developed by researchers from Goethe University. This collaboration broke new ground with the first machine-generated book to be published by a scholarly publisher. The book is available as a free downl ... more
Is there something up with stinky inflatable pool toys?
Inflatable toys and swimming aids, like bathing rings and arm bands, often have a distinctive smell which could indicate that they contain a range of potentially hazardous substances. Some of these compounds, which include carbonyl compounds, cyclohexanone, phenol and isophorone, might be c ... more
The secrets of vibration-enhanced conductivity in graphene
Graphene, the one-atom-thick material made of carbon atoms, still holds some unexplained qualities, which are important in connection with electronic applications where high-conductivity matters, ranging from smart materials that collectively respond to external stimuli in a coherent, tunab ... more
Springer is a leading global scientific, technical and medical portfolio, providing researchers in academia, scientific institutions and corporate R&D departments with quality content through innovative information, products and services. more
Read what you need to know about our industry portal chemeurope.com.
© 1997-2022 LUMITOS AG, All rights reserved
