Natural Science Forum / Chemistry / Electrochemistry / July 2006

I am trying to measure low-level of fluoride (hopefully below 0.01 ppm)
in a defined bacterial medium with about 400 ppm of chloride and 1000
ppm of phosphates. I would like to get some opinions about which method
is better. So far I didn't have success with either of the method.

I am after a bit of advice on selecting a battery chemistry for a helmet
camera system we are developing. The system consists of a compact flash
recorder, bullet camera, microphone and battery pack. The battery pack
must supply between 8 and 15 vdc at 375 mA for up to 3 hours. ...

I've seen some announcement of these.  Where could I find more detailed
specs?
Ted

Can you tell me if changes in electrode rotation rate have any
influence on cathodic reaction - evolution of hydrogen? Is it possible
that with increasing the rotation rate of disc electrode cathodic
current density become higher? The working electrode is Al disc

I just bought some 3500mAh NiMh rechargables and a 120mAh charger. The
battery pack says normal charge time: 16 hours with a 350 mA charge, and
2.5 hours with a 1750 mA charge. Neither of these add up to 3500 mAh.
How long do I charge the batteries with my 120 mAh charger? I know ...

A science museum is using zinc plates to show students how to make simple
wet-cell batteries.  The commercial zinc they are using is corroded and
needs to be cleaned before it can be used.  Any suggestions for chemicals
to remove the corrosion?  (Their current method is steel ...

There is a recipe for plating Cu with Zn. You dissolve some
ZZZZZn metal in hot KOH or NaOH, leaving some undissolved.
Then touch the Zn metal with the Cu, and Zn will deposit on it.
Does anybody here know what the reaction is? Clearly, the

I am new in EIS and I am studying about lacquer coated (two
lacquer----> Primer and Top)Aluminium.
Please tell me What I know it's Correct or not???
Please Click This Link!!!

Hi
I have a NiCd battery from a Jet Ranger Helicopter containing 19 cell
units to give a 24V 13Ah rated unit. However, 85% seem to show
negative response when tested with a multi meter. Do I take it they

Greetings All
Looking for Digital Thermometer without auto shut off tia sal2
I'm looking for a digital thermometer without the auto shutoff something
like this http://www.amazon.com/gp/product/B00009WE45/103-9704723-5279065?

I just bought some 3500mAh NiMh rechargables and a 120mAh charger. The
battery pack says normal charge time: 16 hours with a 350 mA charge, and
2.5 hours with a 1750 mA charge. Neither of these add up to 3500 mAh.
How long do I charge the batteries with my 120 mAh charger? I know ...

AIXD Model CRD 202  (as reported) used in an ACER laptop.  Acer has no
data.
Described as a 130 mAh cell.
The AIXD Model CRD 202 was read from the battery label.

Europositron makes some very intriguing claims for a new aluminum battery,
but I have not been able to find any scientific information.   Is there some
information available on the SCIENCE of this battery?
http://www.europositron.com/en/background.html

Li-Ion or NiCd, of course just temporarily-I heard the trick with
regular non-rechargable ones is to heat them up for a few minutes..