ASTM D3375-95a

NOTICE: This standard has either been superseded and replaced by a new version or
withdrawn. Contact ASTM International (www.astm.org) for the latest information.
Designation: D 3375 – 95a
AMERICAN SOCIETY FOR TESTING AND MATERIALS
100 Barr Harbor Dr., West Conshohocken, PA 19428
Reprinted from the Annual Book of ASTM Standards. Copyright ASTM
Standard Test Method for
Column Capacity of Particulate Mixed Bed Ion
1
Exchange Materials
This standard is issued under the fixed designation D 3375; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
1. Scope bed ion exchange materials for conformance to specifications.
When a representative sample of the mixed bed can be
1.1 This test method covers the determination of the perfor-
obtained from an operating unit, this test method can be used
mance of particulate mixed bed ion exchange materials in the
to evaluate the regeneration efficiency by comparison with the
regenerated form when used for deionization. It is intended for
same data obtained with new material from the same manu-
use in testing unused mixed bed materials and samples of
factured lots, or retained samples of the in-place products.
regenerated mixed beds from operating units.
5.2 This test method provides for the calculation of capacity
1.2 This standard does not purport to address all of the
in terms of the volume of water treated to a conductivity end
safety concerns, if any, associated with its use. It is the
point.
responsibility of whoever uses this standard to consult and
establish appropriate safety and health practices and deter- 5.3 The test method as written assumes that the cation
mine the applicability of regulatory limitations prior to use. exchange material has been regenerated to the hydrogen form
with acid and the anion exchange material has been regener-
2. Referenced Documents
ated with alkali to the hydroxide or free-base form. In certain
2.1 ASTM Standards:
applications a cation exchange material in the potassium,
D 1125 Test Methods for Electrical Conductivity and Re-
ammonium, or other monovalent form may be encountered.
2
sistivity of Water
Such materials may be tested following this procedure using
2
D 1129 Terminology Relating to Water
Test Water A (Test Methods D 1782) as the influent and
2
D 1193 Specification for Reagent Water
substituting the hardness end point (Test Methods D 1782) for
2
D 1293 Test Methods for pH of Water
the end points prescribed herein.
D 1782 Test Methods for Operating Performance of Par-
5.4 In most cases the product tested will be properly mixed
3
ticulate Cation-Exchange Materials
and will contain the correct proportions of anion and cation
D 2687 Practices for Sampling Particulate Ion-Exchange
exchange materials. However, if the pH as well as the
3
Materials
conductivity of the effluent is measured, the test method will
D 2777 Practice for Determination of Precision and Bias of
indicate which of the components is present in excess; an acid
2
Applicable Methods of Committee D-19 on Water
effluent at breakthrough indicating an excess of regenerated
cation exchange groups and an alkaline effluent an excess of
3. Terminology
regenerated anion exchange groups. In such cases the volumes
3.1 Definitions—For definitions of terms related to water,
of the two components obtained in the final backwash will
refer to Terminology D 1129.
indicate whether this imbalance arises from improper regen-
4. Summary of Test Method
eration or from an improper ratio of the two components. It
should be noted, however, that not all units are charged with a
4.1 This test method consists of exhausting a column of
balanced ratio of anion-exchanging and cation-exchanging
regenerated mixed bed ion exchange material to a specific end
groups. Hence, wherever possible, a field sample should be
point with an influent solution of known composition and
evaluated in comparison with a retained sample of the original
volume.
charge.
5. Significance and Use
5.5 This test method provides for the calculation of capacity
5.1 This test method can be used to evaluate unused mixed
on either a wet weight basis or a volume basis. Although such
materials are normally bought and sold in terms of cubic feet,
they are actually packaged in wet pounds. Therefore, it is the
1
This test method is under the jurisdiction of ASTM Committee D-19 on Water
capacity on a wet weight basis that is directly correlatable to
and is the direct responsibility of Subcommittee D19.08 on Membranes and Ion
Exchange Materials. the amount of material in a given shipment.
Current edition approved Sept. 10, 1995. Published November 1995. Originally
5.6 Calculation of a volume capacity is based on the
published as D 3375 – 75. Last previous edition D 3375 – 95.
2 exhausted, separated vo
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