ASTM E507-98

NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
Designation: E 507 – 98
Standard Test Method for
Aluminum in Iron Ores by Atomic Absorption Spectroscopy
This standard is issued under the fixed designation E 507; 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 trained analysts capable of performing common laboratory
practices skillfully and safely. It is expected that work will be
1.1 This test method covers the determination of aluminum
performed in a properly equipped laboratory and that proper
in iron ores, concentrates, and agglomerates in the concentra-
waste disposal procedures will be followed. Follow appropriate
tion range from 0.1 to 5 %.
quality control practices such as those described in Guide
1.2 This standard does not purport to address all of the
E 882.
safety problems, if any, associated with its use. It is the
responsibility of the user of this standard to establish appro-
5. Interferences
priate safety and health practices and determine the applica-
5.1 None of the elements normally found in iron ores
bility of regulatory limitations prior to use.
interfere with this test method.
2. Referenced Documents
6. Apparatus
2.1 ASTM Standards:
6.1 Atomic Absorption Spectrometer, meeting the following
E 50 Practices for Apparatus, Reagents, and Safety Precau-
2 criteria:
tions for Chemical Analysis of Metals
6.1.1 Minimum Sensitivity—The absorbance of the highest
E 276 Test Method for Particle Size or Screen Analysis at
calibration solution (see 7.3) must be at least 0.3.
No. 4 (4.75-mm) Sieve and Finer for Metal-Bearing Ores
2 6.1.2 Curve-Linearity—The difference between the read-
and Related Materials
ings of the two highest calibration solutions (40 and 50 mL)
E 663 Practice for Flame Atomic Absorption Analysis
must be more than 1.4 times the difference between the
E 882 Guide for Accountability and Quality Control in the
readings for the zero solution and the lowest calibration
Chemical Analysis Laboratory
solution (0 and 5 mL).
3. Summary of Test Method 6.1.3 Minimum Stability—The coefficient of variation of a
number of measurements of the highest calibration solution
3.1 The sample is dissolved in hydrochloric acid with the
and of the zero calibration solution must be less than 1.5 % and
addition of a small amount of nitric acid. After evaporation and
0.5 % respectively, relative to the measurement of the highest
dehydration, any insoluble residue is filtered, treated for the
calibration solution.
recovery of aluminum, and added to the main solution. The
solution is aspirated into the flame of a nitrous oxideacetylene
NOTE 1—Use of a strip chart recorder or digital readout device, or both,
burner. The absorbed energy at the resonance line of the
is advisable.
NOTE 2—Instrument parameters will vary with each instrument. The
spectrum of aluminum is measured by atomic absorption
following parameters were successfully used in several laboratories and
spectroscopy and compared with that of the calibration solu-
they can be used as guidelines. Solutions were aspirated into a nitrous
tions.
oxide-acetylene flame of a premix burner.
Hollow cathode lamp, mA 25
4. Significance and Use
Wavelength, l, A 3961.5
4.1 This test method is intended as a referee method for
Nitrous oxide flow rate, L/min 13.8
Acetylene flow rate, L/min 6.6
compliance with compositional specifications for impurity
content. It is assumed that all who use this procedure will be
7. Reagents
7.1 Purity and Concentration of Reagents—The purity and
concentration of the common chemical reagents used shall
This test method is under the jurisdiction of ASTM Committee E-1 on
Analytical Chemistry for Metals, Ores, and Related Materials and is the direct
conform to Practices E 50. Special apparatus and reagents
responsibility of Subcommittee E01.02 on Ores, Concentrates and Related Metal-
required are located in separate sections preceding the proce-
lurgical Materials.
dure.
Current edition approved Jan. 15, 1993. Published March 1993. Originally
published as E 507 – 73. Last previous edition E 507 – 73 (1988).
Annual Book of ASTM Standards, Vol 03.05.
Annual Book of ASTM Standards, Vol 03.06.
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959, United States.
NOTICE: This standard has either been superceded and replaced by a new version or discontinued.
Contact ASTM International (www.astm.org) for the latest information.
E507–98
7.2 Aluminum, Standard Solution (1 mL = 0.5 mg Al)— burner or in a muffle furnace until a clear melt is obtained.
Dissolve 0.5000 g of high-purity aluminum in 25 mL of
Dissolve the cool melt in the reserved filtrate from 9.3, remove
hydrochloric acid (HCl, sp gr 1.19) and dilute to 1 L.
and wash the crucible and cover. Transfer the solution to a
7.3 Aluminum Calibration Solutions—Transfer 5.0, 10.0,
200-mL volumetric flask, dilute to volume, and mix. If the
20.0, 40.0, and 50.0-mL portions of the standard aluminum
solution is cloudy at this stage, indicating the presence of
solution to 200-mL volumetric flasks. Dilute to about 100 mL,
titania, filter a portion of the solution through a dry paper into
add 6 mL of HCl (sp gr 1.19) and 60 mL of the background
a dry beaker. Use this solution for the atomic absorption
solution, dilute to volume, and mix.
measurements, if the aluminum content is between 0.1 and
7.4 Iron, Background Solution (10 g/L)—Dissolve 10 g of
2.5 %. For aluminum contents greater than 2.5 %, transfer a
high-purity iron in 50 mL of HCl (sp gr 1.19) and oxidize by
40-mL aliquot to a 200-mL volumetric flask, add 50 mL of
the dropwise addition of nitric acid (HNO , sp gr 1.42).
background solution and 4 mL of HCl. Dilute to volume and
Evaporate to a syrupy consistency. Add 20 mL of HCl (sp gr
mix.
1.19) and dilute to 200 mL with water. Add 20 g of sodium
9.5 Adjustment of Atomic Absorption Spectrometer—In ac-
chloride (NaCl) dissolved in 200 mL water and dilute to 1 L
cordance with Practice E 663, set the initial instrument param-
with water.
eters to the values in Note 2. Light the burner and aspirate
7.5 Zero Calibration Solution—Transfer 60 mL of the
water until the instrument comes to thermal equilibrium.
background solution to a 200-mL volumetric flask, add 6 mL of
Optimize instrument response by adjusting the wavelength,
HCl (sp gr 1.19), dilute to volume, and mix.
fuel, air, burner, and nebulizer while aspirating the highest
8. Sample Preparation
...