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ASTM D 6317 Document Information:
Title
Standard Test Method for Low Level Determination of Total Carbon, Inorganic Carbon and Organic Carbon in Water by Ultraviolet, Persulfate Oxidation, and Membrane Conductivity Detection
ASTM International
Publication Date:
Sep 10, 1998
Scope:
This test method covers the determination of total carbon (TC),
inorganic carbon (IC), and total
organic carbon (TOC) in water in the range from 10 to 1000 µg/L
of carbon. This method is for
laboratory or grab sample applications and has been subjected to an
interlaboratory study under the
guidelines of D 2777. Test Method D 5997 can be used for on-line
determinations. The test method
utilizes persulfate or ultraviolet oxidation of organic carbon, or
both coupled with a CO2
selective membrane to recover the CO2 into deionized water. The change
in conductivity of the
deionized water is measured and related to carbon concentration in the
oxidized sample. Inorganic
carbon is determined in a similar manner without the oxidation step.
In both cases, the sample is
acidified to facilitate CO2 recovery through the membrane. The
relationship between the
conductivity measurement and carbon concentration is described by a
set of chemometric equations
for the chemical equilibrium of CO2, HCO3−, and H+,
and the relationship between
the ionic concentrations and the conductivity. The chemometric model
includes the temperature
dependence of the equilibrium constants and the specific conductances
resulting in linear response
of the method over the stated range of TOC. See Test Method D 4519 for
a discussion of the
measurement of CO2 by conductivity.
This test method has the advantage of a very high sensitivity detector
that allows very low
detection levels on relatively small volumes of sample. Also, use of
two measurement channels
allows determination of CO2 in the sample independently of organic
carbon. Isolation of the
conductivity detector from the sample by the CO2 selective membrane
results in a very stable
calibration, with minimal interferences.
This test method was used successfully with reagent water spiked with
various organic materials. It
is the user's responsibility to ensure the validity of this test
method for waters of untested
matrices.
In addition to laboratory analyses, this test method may be adapted to
on line monitoring. See Test
Method D 5997.
This standard does not purport to address all of the safety concerns,
if any, associated with its
use. It is the responsibility of the user of this standard to
establish appropriate safety and
health practices and determine the applicability of regulatory
limitations prior to use.
Keywords:
- carbon
- carbon dioxide
- high-purity water
- inorganic carbon
- low temperature oxidation
- membrane conductivity detection
- organic carbon
- total carbon
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