ASTM G140-02

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Designation:G140–02
Standard Test Method for
Determining Atmospheric Chloride Deposition Rate by Wet
1
Candle Method
This standard is issued under the fixed designation G140; the number immediately following the designation indicates the year of
original adoption or, in the case of revision, the year of last revision.Anumber in parentheses indicates the year of last reapproval.A
superscript epsilon (e) indicates an editorial change since the last revision or reapproval.
NOTE 1—Chlorides in the atmosphere exist as a suspension of liquid
1. Scope
droplets or solid particles. They are transported to solid surfaces by
1.1 This test method describes a wet candle device and its
gravity, wind, or brownian motions. These transport mechanisms are
use in measuring atmospheric chloride deposition (amount of
direction-sensitive so that a vertical cylinder will not necessarily receive
chloride salts deposited from the atmosphere on a given area
the same flux as a horizontal plate, or objects with different sizes and
per unit time). orientations. Therefore, the use of this approach to provide an indication
ofthedepositionofchloridesonobjectsinatmosphericexposuresmaynot
1.2 Data on atmospheric chloride deposition can be useful
be quantitatively accurate; however, this technique has been successful in
in classifying the corrosivity of a specific area, such as an
classifying the severity of exposure in a variety of marine locations.
atmospheric test site. Caution must be exercised, however, to
3.2 The sites where samples are to be taken and the
take into consideration the season because airborne chlorides
sampling time periods should be established. A continuous
vary widely between seasons.
program of monthly or 30-day exposures is recommended for
1.3 This standard does not purport to address all of the
sitecharacterization.Seasonalmonitoringmaybeperformedif
safety concerns, if any, associated with its use. It is the
there are specific periods of interest.
responsibility of the user of this standard to establish appro-
priate safety and health practices and determine the applica-
4. Apparatus
bility of regulatory limitations prior to use.
4.1 Components—The components needed to construct one
2. Referenced Documents
wet candle device are as follows:
4.1.1 Erlenmeyer Flask, narrow mouth, 500 mL, (glass or
2.1 ASTM Standards:
2
polypropylene). Other size flasks may be used, but dimensions
D1193 Specification for Reagent Water
D4458 Test Method for Chloride Ions in Brackish Water, in Fig. 1 will have to be adjusted accordingly.
2
Seawater, and Brines
NOTE 2—Polypropylene flasks are recommended during threat of
G92 Practice for Characterization of Atmospheric Test
freezing weather.
3
Sites
4.1.2 Glass Test Tube, general purpose, 16 by 150-mm
2.2 ISO Standard:
length.
ISO 9225 Corrosion of Metals and Alloys. Aggressivity of
4.1.3 Solid Rubber or Neoprene Stopper, No. 7, diameter
Atmospheres—Methods of Measurement of Pollution
top 38 mm, bottom 30 mm.
4
Data
4.1.4 Cotton Bandage Gauze, strip, 50 mm wide and ap-
proximately 1500 mm long.
3. Significance and Use
3.1 This test method is capable of generating quantitative NOTE 3—The overall length of the gauze may vary with installation.
values of atmospheric chloride deposition specifying milli-
4.1.5 Type IV Reagent Water, 1 L, 200 mL CHOH
grams of chloride ions per square metre per day (or other units
(CH OH ) (glycerin) and 20 drops CH (CH ) COOH (oc-
2 2 3 2 6
derived from such values).
tanoic acid) should be added to prevent freezing, if necessary
(See Specification D1193).
4.1.6 Gloves, vinyl, one pair.
1
This test method is under the jurisdiction of ASTM Committee G01 on
Corrosion of Metals and is the direct responsibility of Subcommittee G01.04 on
NOTE 4—Poly(vinylchloride)(PVC)isrecommended.Latexglovesare
Atmospheric Corrosion.
not acceptable, as their chloride content is reported to be comparable to
Current edition approved June 10, 2002. Published July 2002. Originally
that of human hands.
published as G140–96. Last previous edition G140–96.
2
Annual Book of ASTM Standards, Vol 11.01.
4.2 Support Stand—A suitable support stand shall be
3
Annual Book of ASTM Standards, Vol 03.02.
erected at the site where the atmosphere is to be sampled. A
4
Available from American National Standards Institute, 11 W. 42nd St., 13th
treatedwoodpost(100by100by2250mm)orgalvanizedpipe
Floor, New York, NY 10036.
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1

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G140
NOTE 1—Dimensions are in millimetres (mm).
FIG. 1 Wet Candle Chloride Apparatus
(42-mm diameter by 2250-mm length) with an attached plate the top, then back down the tube to the stopper, pass the gauze
on top is suitable, with 750 mm in the ground and 1500 m
...