Natural Science Forum / Chemistry / Analytical Chemistry / January 2007

anyone know what a used one of these would be worth in US$ w/ autosampler?

I would like to open a discussion on air analysis.  I am running EPA
compendium method TO-3 and TO-15r with an Entech 7100 concentrator, Entech
7500 robotic autosampler and am in the process of adding a 7032lb loop
autosampler with electronic splitting option.  On the analytical ...

I would like to buy a spectrophotometer but I don't decide:  UV or
infrared???
I have to make analysis of different samples: wine, pigments of
plants... and I don't know wich

Can any body translate this text for me
Some names are abriviated.Please let them be as such. They are only in
terms of A.B.C.D.
Synthese von AC..

hi...
  ı need some information about prufication of mercury.... could you
help me..... pleaseeeeee....

I am having trouble figuring out what the changes in volume would be on
pH.  If a 50mL of 0.25 HCl is added to a buffer of pH 10.95 (250mL).
Also, what would the effect of dilution have on the pH?  would it
decrease by the ratio of dilution?  Any help would be greatly

Hallo people, I need help to how cauculate de pH using the excell , I
need to put the pH result in a cell and the others tell to me ,  molar
concentration, n1, mass, volume. How Could I do it?

I mixed up 4.1g/L of a Copper Sulfate stock solution .  Would this be a
0.41% solution then?  I then added 60ml of this to 20L of wine.  I think
my wine now has about 12ppm.  I am right?  If not, can someone show me
the calculation?