Standard Test Method for
Metals in Cellulose by Atomic Absorption
Spectrophotometry1

This standard is issued under the fixed designation D 4085; 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 determination of the iron,
copper, manganese, and calcium content of cellulose pulp from
wood or cotton.

1.2 This standard does not purport to address all of the
safety concerns associated with its use if any. It is the
responsibility of the user of this standard to establish appropriate safety and health practices and determine the applicability of regulatory limitations before use.

2. Referenced Documents

2.1 ASTM Standards:
D 1193 Specification for Reagent Water2
D 1348 Test Methods for Moisture in Cellulose3
D 3516 Test Methods for Ashing Cellulose3
E 177 Practice for Use of the Terms Precision and Bias in
ASTM Test Methods4
E 691 Practice for Conducting an Interlaboratory Study to
Determine the Precision of a Test Method4

3. Summary of Test Method

3.1 The sample is ashed by Test Methods
D 3516.

3.2 This test method is dependent on the fact that metallic
elements in the ground state will absorb light of the same
wavelength they emit when excited. When radiation from a
given exciting element is passed through a flame containing
ground-state atoms of that element, the intensity of the transmitted radiation will decrease in proportion to the amount of
the ground-state element in the flame. A hollow cathode lamp
whose cathode is made of the element to be determined
provides the radiation. The metal atoms to be measured are

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