ASTM E848-94(2006)
(Guide)Standard Guide for Safety and Health Requirements Relating to Occupational Exposure to Water-Insoluble Chromates
Standard Guide for Safety and Health Requirements Relating to Occupational Exposure to Water-Insoluble Chromates
SIGNIFICANCE AND USE
This guide includes chromates that are not readily soluble in water and that have water solubilities (Chromate ION) within the range of the more soluble calcium chromate and the much less soluble lead chromate. The major occupations involving potential exposure to insoluble chromates are in roasting of chromite ore, the manufacture of chromate pigments, the manufacture of coatings containing chromate pigments, and spray painting with these coatings. There is insufficient evidence to conclude that trivalent chromium compounds are carcinogenic.
SCOPE
1.1 This guide covers control procedures for the safe production, storage, transportation, and handling of only the hexavalent chromium compounds found in and their various hydrates, and mixtures of coprecipitates of the same regardless of crystalline form.
1.2 This guide is not intended to cover ( a) such "soluble" chromates as chromates of sodium, potassium, magnesium, or ammonium; (b) soluble bichromates; (c) chromic acid; (d) volatile chromyl compounds; (e) any trivalent chromium compound; or (f) elemental chromium. Omission of said compounds or classes of compounds should not be construed to mean that they may be handled without due regard to their particular physical, chemical, and toxicological hazards (, , ).
1.3 The chromate ion, CrO42, depending upon the acidity, complexes to form di-, tri-, and higher polychromates; hence, the chromates listed in may contain mixtures of polychromates, depending on the method of isolation and end use.
This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of whoever uses this standard to consult and establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use. (For more specific precautionary information see Section 5.)
General Information
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Standards Content (Sample)
Designation: E848 − 94 (Reapproved 2006)
Standard Guide for
Safety and Health Requirements Relating to Occupational
1
Exposure to Water-Insoluble Chromates
This standard is issued under the fixed designation E848; 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 (´) indicates an editorial change since the last revision or reapproval.
INTRODUCTION
Thisguideisintendedtoprovideguidanceinthesafehandlingofcertainchromatecompoundsthat
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are suspected to be carcinogenic in man (1-8). Precautions contained herein are believed to protect
against possible carcinogenicity, and will also be sufficient to obviate any acute health hazards except
where skin hypersensitivity is a factor. Other hazards are considered and discussed.
The time-weighted average (TWA) permissible exposure limit (PEL) specified in this guide are
based on studies evaluated by the American Conference of Government Industrial Hygienists
(ACGIH) (9). Epidemiological studies of the chromate producing industry have indicated that
observed adverse health effects were associated with environmental levels and hygiene procedures
considerably less exacting than those recommended here (see Appendix X1).
Hygiene controls and medical surveillance measures have been chosen to protect workers,
recognizingthatthepotentialforexposurewillvarywidelyfromindustrytoindustryandbetweenone
location and another, depending on the compounds handled, scale of operations, kind of process, and
physical conditions.
The key to maintaining chromate levels below the PELis through implementation of cost effective
engineering controls augmented as necessary by personal protective equipment, or work practice
controls, or both. The choice of methods should depend upon the factors involved in each specific
situation.
Biological monitoring is also recommended for lead chromate (see 7.4).
All applicable federal, state, county and local regulations must be complied with when this guide
is used.
1. Scope volatile chromyl compounds; (e) any trivalent chromium
compound; or (f) elemental chromium. Omission of said
1.1 This guide covers control procedures for the safe pro-
compoundsorclassesofcompoundsshouldnotbeconstruedto
duction, storage, transportation, and handling of only the
mean that they may be handled without due regard to their
hexavalent chromium compounds found in Table 1 and their
particular physical, chemical, and toxicological hazards (9, 10,
various hydrates, and mixtures of coprecipitates of the same
11).
regardless of crystalline form.
−2
1.3 The chromate ion, CrO , depending upon the acidity,
4
1.2 This guide is not intended to cover (a) such “soluble”
complexes to form di-, tri-, and higher polychromates; hence,
chromates as chromates of sodium, potassium, magnesium, or
the chromates listed in Table 1 may contain mixtures of
ammonium; (b) soluble bichromates; (c) chromic acid; (d)
polychromates, depending on the method of isolation and end
use.
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This guide is under the jurisdiction of ASTM Committee D01 on Paint and
1.4 This standard does not purport to address all of the
Related Coatings, Materials, and Applications and is the direct responsibility of
safety concerns, if any, associated with its use. It is the
Subcommittee D01.21 on Chemical Analysis of Paints and Paint Materials.
Current edition approved June 1, 2006. Published June 2006. Originally
responsibility of whoever uses this standard to consult and
approved in 1982. Last previous edition approved in 2000 as E848–94(2000).
establish appropriate safety and health practices and deter-
DOI: 10.1520/E0848-94R06.
2
mine the applicability of regulatory limitations prior to use.
The boldface numbers in parentheses refer to the references at the end of this
guide. (For more specific precautionary information see Section 5.)
Copyright © ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States
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E848 − 94 (Reapproved 2006)
TABLE 1 Examples of Some Hexavalent Chromium Compounds
4. Significance and Use
A
Chemical Name Formula Color Index Name
4.1 This guide includes chromates that are not readily
Barium chromate BaCrO Pigment Yellow 31
4
soluble in water and that have water solubilities (Chromate
Barium potassium chromate BaK (CrO ) Pigment Yellow 31
3 4 2
ION) within the range of the more soluble calcium chromate
Basic copper chromate CuCrO Not listed
4
xCu(OH)
2 and the much less soluble lead chromate. The major occupa-
Basic cadmium chromate Cd (OH) CrO Pigment Yellow 44
2 2 4
tionsinvolvingpotentialexposuretoinsolublechromatesarein
Basic lead chromate PbCrO PbO Pigment Orange 21
4
roasting of chromite ore, the manufacture of chromate pig-
Bismuth basic dichromate Bi O CrO Pigment Red 103
2 3 3
Calcium chromate CaCrO None assigned
4 ments, the man
...
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