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Science Forum Index » Chemistry Forum » Wet Chemistry going going gone?...
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| steve... |
 Posted: Thu Jun 12, 2008 11:04 am |
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Are there any commercial labs that still do wet chemical analysis? If
so who? Perhaps wet chemistry is too time intensive and everything can
be done by instruments? I know this is the trend. Perhaps I’m showing
my age/ignorance but I believe that for some things traditional wet
chemical techniques are more accurate – CO2, Carbonate, silica
oxidation states?
Thanks for any thoughts
Steve |
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| Bill Penrose... |
| Posted: Fri Jun 13, 2008 4:24 pm |
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On Jun 13, 11:46 am, Marvin <physc... at (no spam) verizon.net> wrote:
...> But one thing has been lost. The textbooks and courses
Quote: taught a lot about sampling and preparing samples. Students
learn a lot less now about this.
Eventually, I recaptured the interest of my students by making the
analytical course about error generation, detection and tracking, and
about sampling and notekeeping. It was a lot harder to rationalize
their way out of that. Even buret and gravimetric methods made sense
when put into that context.
DB |
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| number6... |
| Posted: Sat Jun 14, 2008 3:24 pm |
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On Jun 12, 4:04 pm, steve <SJgerdem... at (no spam) yahoo.com> wrote:
Quote: Are there any commercial labs that still do wet chemical analysis? If
so who? Perhaps wet chemistry is too time intensive and everything can
be done by instruments? I know this is the trend. Perhaps I’m showing
my age/ignorance but I believe that for some things traditional wet
chemical techniques are more accurate – CO2, Carbonate, silica
oxidation states?
Thanks for any thoughts
Sure there are plenty ... Those popular and certified are the
compliance labs ... so there are lots more there ... 90 % of what
people need outside labs for ...
But there are many labs that follow ASTM/FCC/USP procedures ... where
no approved instrumental procedure exists ...
Also ... Precious metals ... You'd be hard pressed to find refiners
happy with anything other than a fire assay/wet chemistry assay ...
They like to hold the silver gold etc. in their hands rather than have
money dependent on a computerized screen ...
Both those type labs will also do referee work for settlement or
specifications by the approved wet chemical technique ...
But you are right ... that asking an environmental lab for wet
chemical work will get you only strange looks and head scratching ... |
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| Fred Kasner... |
| Posted: Sat Jun 14, 2008 5:28 pm |
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steve wrote:
Quote: Are there any commercial labs that still do wet chemical analysis? If
so who? Perhaps wet chemistry is too time intensive and everything can
be done by instruments? I know this is the trend. Perhaps I’m showing
my age/ignorance but I believe that for some things traditional wet
chemical techniques are more accurate – CO2, Carbonate, silica
oxidation states?
Thanks for any thoughts
Steve
My friend's commercial lab has been instrumental for a very long time.
About the only stuff they do that is wet is Karl Fisher water analysis.
And in many cases the samples they are sent to analyze are themselves
liquids. And only rarely do they seem to have clients who want more than
a couple of significant figures from the results.
FK |
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| Fred Kasner... |
| Posted: Sat Jun 14, 2008 5:30 pm |
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dlzc wrote:
Quote: Dear steve:
On Jun 12, 2:04 pm, steve <SJgerdem... at (no spam) yahoo.com> wrote:
Are there any commercial labs that still do wet
chemical analysis? If so who? Perhaps wet
chemistry is too time intensive and everything
can be done by instruments?
UNLV had to do "Parr bomb calorimetry" to (more) accurately determine
how much perchlorate had been adsorbed to ion exchange media. Does
that count?
David A. Smith
Parr bomb calorimetry is not really wet chemistry but a physical
chemistry measurement.
FK |
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