[neal_mcg]

Hi everyone,

I'm part of a laboratory that has just purchased a Sievers 900 Total Organic Carbon (TOC) analyzer. Just wondering if anyone has any experience using this instrument?

Specifically what kind of values you may have successfully used in the manual reagent configuration. The operation manual gives limits of oxidizer to use with certain concentrations of samples, but these are huge ranges.
For Example:

25 - 50 ppm Carbon uses oxidizer in the range 2.8 - 13.5 μl/min

As part of our in house calibration checks we would like to have an upper calibration value of 40ppm Carbon, but i am unsure how much oxidizer this will require, a calculation from this range would suggest somewhere around the 10.8 μl/min mark but in practice this provides a low TOC value (~37.3ppm).
Does anyone have an accurate way of working out the amount of oxidizer needed without hours of trial and error sample runs?

Thanks in advance!

[marquis]

The Sievers tech people are pretty good.  They can give you a good idea of the amount to use.

For most of routine testing purified water, we could get by without using oxidizer.  The dissolved
oxygen in the water took care of everything we needed.

Good luck.