A new standard for chemical testinghas been developed for a carcinogenic chromium salt. US scientist at the National Institute of Standards and Technology have issued a new reference material that will help envionmental scientists detect the cancer causing pollutant more accurately in soil samples. This new eference will provide a benchmark for high qualit chemical measurnments needed to guide cleanup efforts. Reprocessed chromium waste contians compounds of both trivalent and hexavalent forms of Chromium. In the 40's and 50's this waste was dumped on sites all over the US. They now all require cleanup. Cleanup efforts are confused by the ambiguous chemistr of chromium. Its ions interact with organic carbon and iron in the soil and are affected by soil pH. The result of this is that the higher VI or lower III oxidation state may be present at different levels. This may pose significent threas to health do to leaking into ground water through environmental exposure. To aid in reducing uncertainty surrounding these important measurements. Scientist have prepared and assigned certified values for standard reference material. The standard reference material will allow investigators to calibrate their analytical equipment and so identify safe or contaminated sites much more precisely.
http://www.intute.ac.uk/sciences/spotlight/issue69/testing_times_chameleon_ch.html
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9 comments:
3 The article review was well written
The artcile was also greatly analysized and written interestingly
The artcile was written very clearly making it easy to understand
2 He should have explained how scientists were able to find these types of salts
Also why people were dumping these salts
1 I learned that certain types of Chromium salts can have devastating effects on our health
The article explained the whole entire process/problem from start to finish. He established a problem and thoroughly explained how they plan on fixing it. The article was well written.
He could have explained every word he used, because i do not know what carcinogenic chromium salt is. Also, he could have written it in a more easy way to understand because it is written very officially.
The 40s and 50s were a big time that waste products being thrown into the ground.
1. The article explained the process very well and in details
2. well written
3. he told us how they would solve the problem that was created
1. could have explained some of the scientific terms
2. why were salts being put there by humans
3. I learned how chromium salts can affect our health negatively
3
- very well written
- interesting topic (enviroment)
- explained the problem and with examples
2
-you could explain better the carcinogenic chromium
- you could explain the difference between the trivalent and hexavalent forms of chromium
1
- I learned that with the standard reference material, scientists are going to be able to identify safe or contaminated sites much more precisely.
3 Easy to understand
2 Well written
1 Many things were well explained
2 Explain carcinogenic chromium salt
1 Explain the discovery
1 Learned more about carcinogenic chromium salt
1. This article was on a unique topic
2. It was well written
3. Really had a lot of depth
1. Make the article a little easier to understand
2. What is carcinogenic chromium salt?
1. In the and 40's and 50's Chromium waste was dumped all over the U.S.
3. He wrote the article very clearly making it easy to understand
He explained the article very well analyzing it very deeply
He wrote about a very interesting and heated topic now, the environment
2. He could have made it a little easier to understand
He could have explained what chromium salt is
1. Previous decades were a big time when waste was just thrown into the ground.
1- good length - not too long not too short
2-well put summary
3- nice topic chosen
1- spelling errors/typos
2- how did these scientists find these salts? explain
1- I learned that this discovery will help lead to a cleaner environment
This article summary was very well written. Also, Ryan picked a very interesting topic to write about. Finally, everything was explained very thoroughly.
Something I didn't understand was what carcinogenic chromium salt was. Also, what is the new reference material. Its is a little confusing.
From this article I learned that the standard reference material will allow investigators to calibrate their analytical equipment and so identify safe or contaminates site much more precisely.
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