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Welcome to the September issue of EVISA's Speciation Newsletter !
Chromium speciation is of particular interest due to the differing health effects of its various forms: hexavalent chromium (Cr(VI)) is classified as carcinogenic, while trivalent chromium (Cr(III)) is considered beneficial for human glucose metabolism. The toxicity of Cr(VI) has led to legislation aimed at limiting human exposure. However, analyzing chromium speciation is challenging, as Cr species can easily convert under changing pH and redox conditions, often occurring during sampling or sample extraction.
To prevent human exposure to Cr(VI), various environmental samples are tested for its presence. Industrial waste, such as electronic waste and automobiles, is monitored to prevent environmental emissions. Fertilizers are tested to avoid soil contamination. Aerosols, like welding dust, are analyzed to limit occupational exposure. Products like cement and leather are checked to prevent skin contact with Cr(VI). Drinking water and food are tested to restrict digestive uptake.
Cr(VI) is highly unstable in the presence of organic material, which can act as a reductant, making its presence in such materials transient. Reports of Cr(VI) in items like cereals, bread, milk, body fluids, or animal tissues are often questionable, typically resulting from inappropriate analytical methods (see the news below).
Conversely, Cr(III) is often cited as essential for human nutrition due to its effects on insulin action. However, recent research suggests that chromium may be beneficial only in pharmacological amounts, rather than as an essential mineral (see the news below).
At EVISA, we have never accepted contracts to perform chromium speciation analysis in body fluids or other biological materials because we knew the outcome for Cr(VI) would be none detectable. Additionally, we have critically reported on the acceptance of Cr(III) complexes with enhanced bioavailability in food supplements and vitamin preparations.
For nearly 20 years, the EVISA Newsletter has kept you informed about research results related to trace elements and their speciation. As a subscriber, you are part of a community of about 350,000 users visiting our web portal each month (see the news below). We strive to provide high-quality information on important research results and topics that warrant discussion. We encourage your participation in these discussions through the "Comments" function at the end of each news article.
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NEWS
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EVISA is keeping you updated with what is going on in speciation analysis. In this section you will find news about the most current research results, about trends, legal issues and information from manufacturers in the field of speciation analysis.
With all the links to further information and publications the News archive is a valuable collection of "hot topics" in speciation analysis. We continuously update even former news with new links and information so that all news are actual all the time.
Chromium speciation analysis for samples containing organic materials
Chromium speciation analysis is crucial because Cr(VI) is highly toxic and carcinogenic, whereas trivalent chromium (Cr(III)) is generally considered less harmful and, in some cases, beneficial for the glucose metabolism. The toxicity of Cr(VI) is the reason for legislation meant to limit the human exposure. For this reason, different kind of samples from the human environment are analyzed for the presence of Cr(VI). As it is the case with all oxidation species, these species can be easily converted by changing pH and redox conditions during sampling and sample pretreatment. Sample pretreatment is challenging for solid samples, since chromium has to be extracted for most speciation techniques calling for liquid samples.
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The Essentiality of Chomium - a Debate
The essentiality of Chromium, particularly in its trivalent form (Cr3+), is praised in most publications dealing with the speciation of chromium. Especially the ambivalence of chromium, with the trivalent form being considered essential, while the hexavalent species is classified as carcinogen, is a very strong argument to differentiate the two species by means of speciation analysis. Yet the essentiality of Cr(III) for human nutrition has been a subject of debate in more recent years.
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EVISA's user community back on growth trajectory
Yesterday, we welcomed the 22 millionth visitor to the EVISA web portal. Over the past 12 months, more than 2.3 million visitors have used the portal as an information source, viewing an average of 5 pages each. These figures are impressive indicators that the user community not only continues to appreciate EVISA's offerings after more than 20 years but is also growing.
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EVENTS
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With
a list of about 50 current entries EVISA is informing you about
interesting events and keeps you updated with their deadlines. By
consulting our list of deadlines you won't miss the opportunity for
early registration at reduced fee or the chance to submit your
contribution in time.
5th ToFCON
Date: November 19,2024 - November 19,2024
Location: Berlin, BAM, Adlershof
October 14,2024 Submission of abstracts
ANAKON 2025
Date: March 10, 2025 - March 13,2025
Location: Leipzig, Germany
November 15, 2024 Notification of acceptance
December 1, 2024 Early registration at reduced fee
Please do not hesitate to inform us in case that your conference related to speciation analysis is missing in our Agenda.
IAP 2024: Interfaces against Pollution 2024
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Location:
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Torino, Italy
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Date:
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15.09.2024 - 18.09.2024
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ISSS 2024: 28th International Symposium on Separation Sciences
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Location:
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Messina, Italy
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Date:
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22.09.2024 - 25.09.2024
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ISC 2024: 34th International Symposium on Chromatography
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Location:
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Liverpool, UK
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Date:
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06.10.2024 - 10.10.2024
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SciX 2024
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Location:
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Raleigh Convention Center | Raleigh, NC
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Date:
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20.10.2024 - 25.10.2024
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11th RAFA: Recent Advances in Food Analysis
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Location:
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Prague, Czech Republic
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Date:
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05.11.2024 - 08.11.2024
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UFDIM 2024: Ultrafast Dynamic Imaging of Matter Conference 2024
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Location:
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DESY Hamburg
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Date:
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18.11.2024 - 20.11.2024
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VACANCIES
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EVISA provides information about open positions for Ph.D. students, PostDocs and permanent staff in the field of speciation. Looking to fill a vacancy or needing a new career challenge? Either way this service is FREE. Many laboratories and research facilities (from Greenland to Crete) have already found their highly educated stuff through this service by EVISA. If you would like to post an open position here, please contact us at info@speciation.net !
Doctorates
PTB Braunschweig: Doctoral candidate in chemistry or biochemistry
At their Braunschweig site, PTB is looking to fill the following position in Department 3.2 (Biochemistry):
Doctoral candidate in chemistry or biochemistry
Remuneration Group 13 TVöD Bund ○ Three-year fixed term ○ Part-time (33.15 hours/week)
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Postdoctoral
Other
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DIRECTORY
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EVISA's directory of scientist is a versatile tool to facilitate contact with scientists in the field of speciation and related sciences. The directory is fully searchable for names, addresses, research topics etc. You should bookmark this directory as an always up-to-date address book. (In order to hinder SPAM robots for collecting the E-mail accounts, we hide them in a special format).
More than 300 active scientists in the field of speciation analysis already joined the directory. Join this great directory that is extensively linked to all type of other information on this site, such as homepages, conferences and literature.
If your entry is still missing in this directory, please contact us at info@speciation.net.
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LINKS
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EVISA provides an easy access to external information. Our database contains more than 2800 links to relevant information from numerous top scientific resources spread over the whole Web. The database is searchable both via full-text and categories such as elements, type of species and type of information. We are permanently updating our links section.
If your web site is missing here, please e-mail your link information to info@speciation.net.
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This issue of evisa's Speciation Newsletter has been sent to you by EVISA, because you have registered for this service. If you would like to modify your user account, please log-in on EVISA's web portal at https://speciation.net with your username and password and edit your user account.
Please feel free to pass this Speciation Newsletter to others who may benefit from EVISA. If you have any contributions or suggestions, please send these to editors@speciation.net.
This is a post-only e-mail. Please do not reply to this message. For all inquiries, problems or suggestions regarding this service, please visit https://speciation.net or contact info@speciation.net
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Copyright 2024 EVISA
All rights reserved. Any unauthorized use, reproduction, or transfer of this message or its contents, in any medium, is strictly prohibited. No part of this publication may be reproduced, stored in a retrieval system or transmitted in any form or by any means, electronic, mechanical, photocopying, recording or otherwise, without the prior written permission of EVISA.
Disclaimer
No responsibility is assumed by the publisher for any injury and/or damage to persons or property as a matter of products liability, negligence or otherwise, or from any use or operation of any methods, products, instructions or ideas contained in the material herein. The Newsletter represents only the opinion of the authors and does not necessarily reflect the opinion of the European Community. The European Community is not responsible for any use that might be made of the information provided.
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