ASTM E156-88

Method for Determination of Phosphorus in High-Phosphorus Brazing Alloys (Photometric Method) (Withdrawn 1993)

General Information

• Status: Withdrawn
• Withdrawal Date: 14-Jan-1993
• ICS: 25.160.50 - Brazing and soldering
• Technical Committee: E01 - Analytical Chemistry for Metals, Ores, and Related Materials

Standards Content (Sample)

ASTM E15b 88 m 0759510 00’4302’4 7
jf&Q2-. go
AMERICAN SOCIETY FOR TESTING AND MATERIALS
1916 Race SI., Philadelphia, Pa. 19103
Designation: E 156 - 88
Reprinied from the Annual Book of ASTM Standards. Copyright ASTM
If not listed in lhe current combined index, will appear in lhe next edition.
Standard Test Method for
Determination of Phosphorus in High-Phosphorus Brazing
Alloys (Photometric Method)‘
This standard is issued under the fixed designation E 156; the number immediately following the designation indicates the year of
original adoption or, in the case ofrevision, the year of last revision. A number in parentheses indicates the year of last reapproval. A
~upe~cript epsilon (c) indicatcs an editorial change since the last revision or reapproval.
procedure are referred to by number and shall conform to
1. Scope
the requirements prescribed in Practices E 50.
1.1 This test method covers the determination of phos-
phorus in alloys having chemical compositions within the
5. Hazards
following limits:
5.1 For precautions to be observed in the use of certain
Element
reagents in this test method, reference shall be made to
Concentration
Range, % Practices E 50.
80 and over
Copper
Silver oto 15 6. Sampling
410 8
Phosphorus
6.1 The sample shall be selected so as to be representative
of the material to be analyzed.
1.2 This standard may involve hazardous materials, oper-
ations, and eqiiìpmcnl. This slandaril docs not piirport io
7. Rounding Calculated Values
address all of the sufity problems associated with ils use. It is
7.1 Calculated values shall be rounded to the desired
the responsibility of the user of this standard to establish
number of places in accordance with the rounding method
appropriate safity and health practices and determine the
given in Rounding-off Procedure Section of Practice E 29.
applicabiiìiy of regiilaiory limitations prior to use. Specific
hazard statements are given in Section 5.
PHOSPHORUS BY THE VANADATE-MOLYBDATE
(PHOTOMETRIC) METHOD
2. Referenced Documents
8. Summary of Test Method
2. I ASTM Slandards:
E 29 Practice for Using Significant Digits in Test Data to 8. I A yellow-colored complex is formed when an excess of
Determine Conformance with Specifications2 molybdate solution is added to an acidified mixture of a
E 50 Practices for Apparatus, Reagents, and Safety Pre- vanadate and an ortho-phosphate. Photometric measure-
cautions for Chemical Analysis of Metals3 ment is made at approximately 470 nm.
E 60 Practice for Photometric and Spectrophotometric
9. Concentration Range
Methods for Chemical Analysis of Metals3
9.1 The recommended concentration range is from O. 15
3. Significance and Use
to 3.0 mg of phosphorus in 100 mL of solution using a cell
3.1 This test method for the chemical analysis of metals path of 2 ~m.~
and alloys is primarily intended to test such materials for
10. Stability of Color
compliance with compositional specifications. It is assumed
that all who use this test method will be trained analysts
10.1 The color of the phosphorus complex develops
capable of performing common laboratory procedures skill-
within 5 min and is stable for at least 1 h.
fully and safely. It is expected that work will be performed in
II. Interfering Elements
a properly equipped laboratory.
1 1.1 The elements ordinarily present in high-phosphorus
4. Photometric Practice, Apparatus, and Reagents
brazing alloys do not interfere. Tin interferes with the
4.1 Pfioiometers and Phoiotnetrìc Practice-Photometers
phosphorus determination by the formation of insoluble
and photometric practice prescribed in this method shall
stannic phosphate.
conform to Practice E 60.
12. Reagents
4.2 Apparatus other than photometers, standard solu-
tions, and certain other reagents used in more than one
12.1 Ammonium Molybdate Solution (100 g/L)-Dissolve
LOO g of (NH,),Mo;O2,~4H,O in 690 mL of water at 50°C
~ ~~
and dilute to 1 L. Filter before using.
This test method is under the jurisdiction of ASTM Committee E-3 on
12.2 Ammonium Vanadate Solution (2.5 g/L)-Dissolve
Chemical Analysis of hletals and is the direct responsibility of Subcommittee
E 03.05 on Nonferrous Metals.
Current edition approved Dec. 30. 1988. Published Febiuary 1989. Originally
publishcd as E 156 - 56 T. Last previous edition E 156 - 83. This procedure has bccn wntlcn for I ccll having a 2-cm light paih. Cclls
Atitiiral Book oJASTM Sfatidards, Vol 14.02.
having oilier dimensions may be used, provided suitable adjustments can be made
’ Annital Book oJASTM Standards, Vol 03.05. in the amounts of sample and reagents used.

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'ASTM ELSb 88 m 0759530 OOq3025 O
## El56
approximately 470 nm, While maintaining this photometer
2.50 g of NH4V03 in 500 mL of hot water. When solution is
adjustment, take the photometric readings of the calibration
complete, add 20 mL of HNO, (1 +i), cool, filter if
...