Astm D 3861 – 91 (Reapproved 2003) pdf free download

Standard Test Method for
Quantity of Water-Extractable Matter in Membrane Filters 1

This standard is issued under the fixed designation D 3861; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of the 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

1.1 This test method covers the gravimetric determination
of the water-extractable material present in membrane filters
and is applicable over the complete concentration range of

1.2 The analyst should be aware that adequate collaborative
data for precision and bias statements as required by Practice
D 2777 is not provided. See Section 11 for details.

1.3 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.

2. Referenced Documents

2.1 ASTM Standards: 2
D 1129 Terminology Relating to Water
D 1193 Specification for Reagent Water
D 2777 Practice for Determination of Precision and Bias of
Applicable Methods of Committee D19 on Water

3. Terminology

3.1 Definitions—For definitions of terms used in this test
method, refer to Terminology D 1129.

4. Summary of Test Method

4.1 The number of water-soluble extractives present in
membrane filters is determined by immersing the preweighed
membrane in boiling reagent-grade water for an extended time,
then drying and reweighing the membrane. A control membrane is employed to eliminate weighing errors caused by
balance changes or changing moisture content of the membrane in the weighing procedures. Weight changes of the
control membrane are applied as a correction factor to the
weight change of the test membrane filters.

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