EPA-540/1-86-016
                                                                Office of Research and Development
                                                                Office of Health and Environmental
                                                                Assessment
                                                                Environmental Criteria and
                                                                Assessment Office
                                                                Cincinnati OH 45268
                      Superfund
vvEPA
                       HEALTH  EFFECTS ASSESSMENT
                       FOR  ACETONE

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                                           EPA/540/1-86-016
                                           September 1984
       HEALTH  EFFECTS  ASSESSMENT
                FOR ACETONE
    U.S. Environmental Protection  Agency
     Office of Research and  Development
Office of Health  and  Environmental Assessment
Environmental Criteria and Assessment Office
            Cincinnati,  OH  45268
    U.S. Environmental  Protection Agency
  Office of  Emergency and Remedial Response
Office of Solid Waste and  Emergency Response
            Washington, DC  20460

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                                  DISCLAIMER

    This  report  has  been funded  wholly  or  In  part by  the  United  States
Environmental  Protection  Agency under  Contract  No.  68-03-3112  to  Syracuse
Research Corporation.  It has been  subject  to  the Agency's peer and adminis-
trative review, and  It has been  approved  for  publication as an EPA document.
Mention of  trade  names or commercial  products  does  not  constitute  endorse-
ment or recommendation for use.
                                      11

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                                    PREFACE
    This report  summarizes  and evaluates Information  relevant  to a prelimi-
nary  Interim  assessment of  adverse  health  effects associated  with acetone.
All  estimates  of  acceptable Intakes and  carcinogenic potency  presented  1n
this  document  should  be   considered   as  preliminary and  reflect  limited
resources   allocated   to   this   project.     Pertinent   toxlcologlc   and
environmental data  were located  through  on-line literature searches  of the
Chemical  Abstracts,  TOXLINE,   CANCERLINE   and  the   CHEMFATE/DATALOG  data
bases.  The basic  literature  searched supporting  this  document  1s current up
to September, 1984.   Secondary sources  of Information have  also been relied
upon  1n the  preparation of  this  report  and  represent  large-scale  health
assessment  efforts  that  entail   extensive   peer  and Agency   review.   The
following Office  of  Health and Environmental Assessment  (OHEA)  sources  have
been extensively utilized:


    U.S.  EPA.    1981.   Criteria  Document for  Acetone.   Environmental
    Criteria and Assessment Office, Cincinnati,  OH.  Internal Draft.

    U.S. EPA.  1983b.   Disposition  of Comments  on  Criteria Document for
    Acetone.  Environmental  Criteria and  Assessment  Office,  Cincinnati,
    OH.  Internal Draft.
    The Intent In these assessments  1s  to  suggest  acceptable exposure levels
whenever sufficient data  were  available.   Values were not  derived  or larger.
uncertainty  factors  were  employed  when the  variable data  were limited  1n
scope tending  to  generate conservative  (I.e.,  protective)  estimates.  Never-
theless, the  Interim  values  presented reflect the relative  degree  of hazard
associated with exposure or risk to the chemlcal(s) addressed.

    Whenever possible, two categories of values  have  been  estimated for  sys-
temic toxicants (toxicants for which  cancer  1s  not the endpolnt of  concern).
The  first,  the AIS  or acceptable  Intake  subchronlc, 1s  an estimate of  an
exposure  level  that  would not  be  expected  to cause  adverse  effects  when
exposure occurs during a  limited  time  Interval  (I.e., for  an  Interval  that
does not  constitute a  significant  portion of  the Hfespan).   This  type  of
exposure estimate  has not been  extensively used  or  rigorously  defined,  as
previous  risk  assessment  efforts  have  been  primarily  directed  towards
exposures from toxicants  1n  ambient air or water  where  lifetime exposure  1s
assumed.   Animal  data  used  for  AIS estimates  generally  Include  exposures
with durations of  30-90  days.  Subchronlc  human data are  rarely available.
Reported exposures are  usually  from chronic  occupational  exposure situations
or from reports of acute accidental exposure.

    The  AIC,  acceptable  Intake  chronic,   1s  similar   In  concept to  the  ADI
(acceptable  dally  Intake).   It Is  an estimate  of  an  exposure level  that
would not  be expected  to cause adverse effects when exposure  occurs for  a
significant portion of the Hfespan  [see U.S.  EPA  (1980)  for a discussion  of
this concept].  The AIC  1s route  specific and estimates  acceptable exposure
for a given route with  the Implicit  assumption  that exposure by other routes
1s Insignificant.
                                      111

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    Composite  scores   (CSs)  for  noncardnogens  have  also  been  calculated
where data permitted.   These  values  are used for  ranking  reportable quanti-
ties; the methodology for their development 1s explained 1n U.S. EPA (1983b).

    For compounds for which there  1s  sufficient  evidence of  carclnogenlclty,
AIS  and  AIC values  are not derived.   For a  discussion of risk  assessment
methodology  for  carcinogens refer  to  U.S.  EPA  (1980).   Since cancer  1s  a
process that 1s  not characterized by  a threshold, any  exposure  contributes
an Increment of  risk.   Consequently,  derivation of AIS  and  AIC values would
be Inappropriate.   For  carcinogens,   q-|*s  have been  computed  based on  oral
and Inhalation  data 1f available.
                                      1v

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                                   ABSTRACT
    In  order  to  place the  risk  assessment  evaluation  1n proper  context,
refer  to  the preface  of   this  document.  The  preface outlines  limitations
applicable to all documents of  this  series as  well  as the appropriate Inter-
pretation and use of the quantitative estimates presented.

    The AIC  for  acetone,  209.6 mg/day,  1s  based  on a  subchronlc  (8-week)
animal  exposure  study showing reversible  changes   following  exposure  to
19,000  ppm acetone.   Although  data are  extremely limited,  fragmentary human
data  at similar  exposure concentrations  Indicate  no adverse effects.   In
addition, this  AIC 1s  below  that which could be  calculated  from  the  most
conservative occupational  exposure guidelines  (NIOSH,  1978).   This  estimate
may  be  conservative and  reflects  the  limited  data base.  Data were  Inade-
quate to estimate an AIS  or AIC for  oral exposure and were also Insufficient
for derivation of a CS.

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                               ACKNOWLEDGEMENTS
    The  Initial  draft  of  this  report  was  prepared  by Syracuse  Research
Corporation under  Contract No.  68-03-3112  for EPA's  Environmental  Criteria
and  Assessment  Office,  Cincinnati,   OH.   Dr.  Christopher  DeRosa and  Karen
Blackburn were the Technical  Project  Monitors  and  Helen Ball  was the Project
Officer.  The final documents  1n  this series  were  prepared for the Office of
Emergency and Remedial Response, Washington, DC.

    Scientists from  the  following U.S. EPA offices  provided  review comments
for this document series:

         Environmental Criteria and Assessment Office, Cincinnati, OH
         Carcinogen Assessment Group
         Office of Air Quality Planning and Standards
         Office of Solid Haste
         Office of Toxic Substances
         Office of Drinking Water

Editorial review for the document series was provided by:

    Judith Olsen and Erma Durden
    Environmental Criteria and Assessment Office
    Cincinnati, OH

Technical support services for the document series  was provided by:

    Bette Zwayer, Pat Daunt, Karen Mann and Jacky Bohanon
    Environmental Criteria and Assessment Office
    Cincinnati, OH
                                      v1

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TABLE OF CONTENTS

1.
2.


3.










4.








5.


ENVIRONMENTAL CHEMISTRY AND FATE 	
ABSORPTION FACTORS IN HUMANS AND EXPERIMENTAL ANIMALS . . .
2.1.
2.2.
ORAL 	
INHALATION 	
TOXICITY IN HUMANS AND EXPERIMENTAL ANIMALS 	
3.1.


3.2.


3.3.


3.4.
SUBCHRONIC 	
3.1.1. Oral 	
3.1.2. Inhalation 	
CHRONIC 	
3.2.1. Oral 	
3.2.2. Inhalation 	
TERATOGENICITY AND OTHER REPRODUCTIVE EFFECTS. . . .
3.3.1. Oral 	
3.3.2. Inhalation 	
TOXICANT INTERACTIONS 	
CARCINOGENICITY 	
4.1.


4.2.


4.3.
4.4.
HUMAN DATA 	
4.1.1. Oral 	
4.1.2. Inhalation 	
BIOASSAYS 	
4.2.1. Oral 	
4.2.2. Inhalation 	
OTHER RELEVANT DATA 	
WEIGHT OF EVIDENCE 	
REGULATORY STANDARDS AND CRITERIA 	
Page
1
3
... 3
... 3
5
5
... 5
... 5
... 5
... 5
5
. , . 6
... 6
6
6
... 7
7
... 7
7
, , . 7
... 7
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                           TABLE  OF  CONTENTS  (cont.)

                                                                        Page

 6.  RISK ASSESSMENT	   10

     6.1.   ACCEPTABLE INTAKE SUBCHRONIC (AIS) 	   10

            6.1.1.    Oral	   10
            6.1.2.    Inhalation	   10

     6.2.   ACCEPTABLE INTAKE CHRONIC (AIC)	   11

            6.2.1.    Oral	   11
            6.2.2.    Inhalation	   11

     6.3.   CARCINOGENIC POTENCY (q-|*)	   12

            6.3.1.    Oral	   12
            6.3.2.    Inhalation	   12

 7.  REFERENCES	   13

APPENDIX: Summary Table for Acetone	   21

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                             LIST  OF  ABBREVIATIONS





ADI                     Acceptable dally Intake



AIC                     Acceptable Intake chronic



AIS                     Acceptable Intake subchronlc



BCF                     B1oconcentrat1on factor



CAS                     Chemical Abstract Service



CS                      Composite score



DNA                     Deoxyrlbonuclelc acid



1050                    Dose lethal to 50% of recipients



NOAEL                   No-observed-adverse-effect  level



ppm                     Parts per million



STEL                    Short-term exposure limit



TLV                     Threshold limit value



TWA                     Time-weighted average
                                      1x

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                     1.  ENVIRONMENTAL CHEMISTRY AND FATE
    The relevant  physical  and chemical properties and  environmental  fate of
acetone (CAS No. 67-64-1} are as follows:
    Molecular weight:
    Chemical class:
    Vapor pressure:
    Water solubility:
    Log octanol/water
    partition coefficient;
    BCF:
    Half-lives 1n A1r:
                Water:
58.08
aliphatic ketone
185.95 mm Hg at 20°C
mlsdble with water
-0.24
0.69 1n haddock
muscle (Melanoqrammus
aeglef1nus)
0.12 (estimated)
14 hours
10 hours to 9 days
U.S. EPA, 1981
U.S. EPA, 1981

U.S. EPA, 1981
U.S. EPA, 1981
Graedel, 1978
U.S. EPA, 1981
    The BCF  value  of 0.12 has  been  estimated  from the equation of  Veith  et
al.  (1979) and the log octanol/water partition coefficient given above.
    The value for the half-life of acetone  In  the  atmosphere 1s based on Its
photochemical reaction  and  the rate  constant for  the  photochemical  reaction
given by Graedel  (1978).   The half-life of acetone 1n water  1s  based on Its
evaporation  rate  from quiescent  to  different  aerated conditions.   The  bio-
degradation  half-life  may be  comparable  to Its evaporation  half-life  under
certain  conditions;   however,  blodegradatlon   has  not  been  considered  In
estimating the aquatic half-life  of  acetone because of the lack of available
rate constant data.
                                      -1-

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    The half-life of acetone  1n  soil  could not be  located  In  the  literature
searched;  however, evaporation 1s expected to be  the  predominant  loss  mecha-
nism from  the  soil  surface.  By  analogy  with the  blodegradatlon  studies  of
acetone 1n  other  media  (U.S.  EPA, 1981),  It  Is  likely that It will  undergo
significant blodegradatlon  1n soils  as  well.  The undecomposed   acetone  Is
expected  to  leach  from  soil  because  of  Its   high  water  solubility  and
expected weak  sorptlon on  soils.   The  detection  of acetone  in  both  soil
leachate and  groundwater  1s  evidence  for  Us soil  Teachability   (U.S.  EPA,
1981).
                                     -2-

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           2.  ABSORPTION FACTORS IN HUMANS AND EXPERIMENTAL ANIMALS
2.1.   ORAL
    Although absorption factors  were  not reported,  several  studies  Indicate
that  acetone  1s  readily  absorbed  through   the   gastrointestinal  tract  1n
humans and animals.
    Schwartz (1898)  administered  acetone either orally  or  subcutaneously  to
dogs.   For both  routes  of  exposure,  59-76%  of   the  administered dose  was
eliminated through expired air, while  1.5-4.7% was  excreted 1n the urine.
    Haggard  et  al.  (1944),  Parmegg1an1 and  Sassl  (1954),   and  Price  and
RHtenberg  (1950) also  reported that  orally administered  acetone  was  elimi-
nated through expired air  and in the urine.
2.2.   INHALATION
    Numerous reports Indicate  that  acetone is  absorbed through the pulmonary
route  of  exposure.   Dalhamn  et al.   (1968)  demonstrated that  60% of  the
Inhaled  dose  of acetone  (~1  mg in cigarette  smoke) was  absorbed  by. humans
within  2  seconds   of  contact.   Haggard et  al.  (1944)  reported  that  the
absorption  of acetone  through inhalation in rats  is  rapid and dose-related,
reaching  steady-state  after 2 days of  continuous  exposure.   Similar  results
were  obtained  with  volunteers;  however,   steady-state  was  not  achieved
because  these  Individuals were  exposed  for  only  8  hours.   Furthermore,
greater  absorption  of  acetone was  observed  1n the  volunteers  who exercised
during Inhalation.
     In an  experiment similar  to  that  of Haggard et al.  (1944), DIVIncenzo et
al.  (1973) determined  that light exercise (a  cycle  of jogging for 5 minutes
followed   by  10  minutes   of  rest)  approximately  doubled the  postexposure
levels  of  acetone   in  the  expired breath  of volunteers.   Wlgaeus  et  al.
                                      -3-

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(1981) also  reported  that  the  absorption of  acetone  through  Inhalation  In
volunteers  Increased  with  exercise,  but added  further  that  the  relative
uptake (39-52%)  was not affected by the workload.
                                     -4-

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                3.  TOXICITY  IN  HUMANS AND  EXPERIMENTAL  ANIMALS
3.1.   SUBCHRONIC
3.1.1.   Oral.   Very  little  Information  regarding  the  subchronlc  toxldty
of  orally  administered  acetone  was  located  1n  the available  literature.
Sollman  (1921)  exposed  three rats to  2.5% acetone  In drinking water  for  18
weeks.   Upon  termination of  the experiment,  the animals  were  found  to  be
"practically  normal,"  experiencing  only weight  loss, which might  have been
due  to  decreased  food   consumption.   No  other  endpolnts  were  examined  or
reported.
3.1.2.   Inhalation.    Information  regarding  the   subchronlc  toxldty   of
Inhaled acetone  Is also  limited.   Bruckner and Peterson  (1981)  exposed rats
to vapors of  acetone  at  levels  of either 0 or 19,000 ppm  for  3  hours/day, 5
days/week for 8 weeks.   Groups  of four  rats  were  killed and examined at 2, 4
and 8 weeks  throughout  exposure  and  at 2 weeks  postexposure.   Narcosis  was
seen  1n  animals  exposed  to  acetone.   These animals,  however,  had  no changes
1n clinical  chemistry variables or hlstologlcal changes  1n the  liver,  brain,
kidneys,  lungs   or  heart  regardless  of  when  they   were  examined.   Slight
decreases 1n  organ weights  and  body  weights were  observed  In rats  killed
during exposure but not 1n rats  killed 2 weeks postexposure.
3.2.   CHRONIC
3.2.1.   Oral.   Pertinent  data  regarding  the chronic  toxldty  of  orally
administered acetone  were not located  1n the available literature.
3.2.2.   Inhalation.   In  two other  occupational   exposure studies, workers
exposed  to  vapors  of acetone at either  19-920  ppm  (Parmegglanl  and  Sassl,
1954) or >750  ppm  (Raleigh  and  McGee,  1972)  complained  of Irritation  of  the
mucosal   membranes,   Including   conjunctivitis,    pharyngitis,   Inflammatory
bronchitis and gastroduodenltls.
                                      -5-

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    Oglesby et al.  (1949)  examined  the  physical  condition,  and hematologlcal
and  urologlcal  variables  1n 800  men  exposed  occupatlonally  to  vapors  of
acetone  (600-2150  ppm).   These  men were examined  once  a year from  1931  to
1948.  There were  no  statistically  significant  differences  between these men
and a  group  of 800 controls  with  respect to any of  the  variables measured,
though  transient  eye  and nose  irritation  was  experienced by  some  of  the
exposed  workers.   This study  Indicates  that exposure  to <2150  ppm  acetone
for <8 hours/day produces no significant toxic effects.
3.3.   TERATOGENICITY AND OTHER REPRODUCTIVE EFFECTS
3.3.1.   Oral.    Pertinent data  regarding   the  teratogenlcity  of  Ingested
acetone  were  not  located  in the available  literature;  however,  acetone  1s
known to cross  the placenta (Dowty et al., 1975).
3.3.2.   Inhalation.   Pertinent   data   regarding   the  teratogenlcity   of
Inhaled acetone were not  located in the available literature.
3.4.   TOXICANT INTERACTIONS
    A  number  of  studies  indicate  that  acetone potentiates the  hepatotoxlc
effects  of carbon  tetrachloride  (Tralger and Plaa, 1973; Plaa  et al., 1975,
1982; Folland et  al.,  1976), 1,1,2-tr1chloroethane  and  1,1 ,l-tr1chloroethane
(Tralger and  Plaa, 1973;  Plaa  et  al.,  1975; MacDonald  et  al.,  1982),  and
Br-CHCl  and  trichloroethane  (Hewitt  et  al.,  1983).    Acetone  was  also
reported to  antagonize semicarbaz1de-1nduced convulsions  1n rats  (Kohli  et
al.,  1967),  but  had  an   additive  effect  upon LD™  In rats  treated  with
acetonltrile (Smyth et al., 1962).
    Glatt  et  al.  (1981)  reported  that  acetone  enhanced  the  mutagenic
activity of dlmethylnitrosamine 1n Iji vitro assays  but not J_n vivo assays.
                                      -6-

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                             4.  CARCINOGENICITY
4.1.   HUMAN DATA
4.1.1.   Oral.    Pertinent  data  regarding  the  cardnogenlcHy  of  Ingested
acetone were not located In  the available literature.
4.1.2.   Inhalation.    Pertinent  data  regarding   the   cardnogenlcHy  of
Inhaled acetone were  not located 1n  the  available  literature.
4.2.   BIOASSAYS
4.2.1.   Oral.    Pertinent   data  regarding   the   cardnogenlcHy  of  orally
administered acetone  were not located  1n the  available literature.
4.2.2.   Inhalation.    Pertinent  data  regarding   the   cardnogenlcHy  of
Inhaled acetone were  not located 1n  the  available  literature.
4.3.   OTHER RELEVANT DATA
    Acetone did  not  show mutagenlc  activity when  tested  1n microblal  assay
systems (McCann et a!.,  1975;  Abbondandolo et a!.,  1980; Maron et al.,  1981;
Haellstrom et  al., 1981)  or  1n cell transformation systems (Freeman et al.,
1973;  Rh1m et  al.,  1974;  Quarles  et  al.,  1979a,b).   Furthermore, acetone
gave  negative  results  In assays that  tested  for chromosomal aberrations and
sister  chromatld exchange  (Norppa  et  al.,  1981;  Norppa,  1981;  Tates and
KMek,  1981),  DNA cell  binding (Kublnskl  et al.,  1981),  point  mutation 1n
mouse  lymphoma  cells  (Amacher  et al.,  1980)  and  transfectlon (Vasavada and
Padayatty,  1981).   In one  study,  however,  acetone was  reported to produce
chomosomal  aberrations  but   not  sister  chromatld  exchange  (Kawachl et al.,
1980).
4.4.   WEIGHT OF EVIDENCE
    Pertinent  data regarding the  cardnogenlcHy  of acetone In humans  or 1n
experimental  animals  were  not  located 1n  the  available  literature.   The
evidence  for  the cardnogenlcHy  of  acetone  In  humans  1s appropriately
                                      -7-

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designated as  Inadequate.   Using the  scheme  for  the  classification of  the
cardnogenlcHy of chemicals  to  humans proposed by the Carcinogenic  Assess-
ment Group of  the  U.S.  EPA (Federal Register,  1984), acetone  is most appro-
priately designated a Class D  - Not  Classified chemical.
                                     -8-

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                     5.   REGULATORY STANDARDS AND CRITERIA







    ACGIH (1983) has recommended a TLV-TWA of  750  ppm and  a STEL of 1000 ppm



for occupational exposure  to acetone.  These  values  were  chosen  to  prevent



nose  and eye  Irritation  (ACGIH,  1980).   NIOSH  (1978)   has  recommended  a



criterion of  250  ppm for  exposure  to acetone  1n  the workplace,  while  OSHA



has adopted  1000  ppm  as  a standard  for occupational  exposure  to  acetone



(Code  of Federal Regulations, 1981).
                                     -9-

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                             6.  RISK ASSESSMENT
6.1.   ACCEPTABLE INTAKE SUBCHRONIC (AIS)
6.1.1.   Oral.   The  only  subchronlc  oral  study  located  1n  the  available
literature was that  of  Sollman  (1921).   Data from  this  study  cannot  be used
to  derive  an  AIS or  a  CS  because  small  numbers of animals were  used;  there
was only one  level of exposure; and hlstologlcal  endpolnts  were not examined
and control animals were not maintained.
6.1.2.   Inhalation.    Bruckner  and  Peterson   (1981)   reported   that   rats
experienced  narcosis  during  the   3-hour  exposure  periods  to  19,000  ppm
acetone.   In  addition,  body  weight was slightly decreased  1n  rats during the
8  weeks  of treatment;  however, body  weight  returned to control  values  by  2
weeks after cessation of exposure  (Bruckner  and Peterson,  1981).   A NOAEL of
19,000  ppm can  be established  on the basis  of reversible changes  In  organ
and body weights 1n rats.
    Using  the- NOAEL  of  19,000  ppm  (45,134  mg/m3),   the  animal  dose  1n
mg/kg/day  can be  calculated  by   assuming  a  rat  breathes  0.26  mVday  and
weighs  0.35   kg, and by expanding  the  exposure from  a 3-hour,  5  days/week
Intermittent  exposure to a continuous  exposure as follows:

                   mg/kg/day = 45,134 mg/m3 x 0.26 mVday x
                     3/24 x 5/7  *  0.35 kg  =  2994 mg/kg/day

    To  calculate  the  AIS,  this  animal   dose   Is  multiplied  by  the  assumed
average  human body weight of  70  kg and  divided by an  uncertainty  factor of
100  (a  factor 10 for converting an animal NOAEL to a human NOAEL and another
factor  of 10 to protect  the  more sensitive  Individuals  of  a population).
The AIS  thus  derived for acetone Is 2096 mg/day.
                                     -10-

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    Although exposure duration  was  only 3 hours/day,  the  extrapolation to a
24-hour  day,  7 days/week  exposure  actually  reduced  the  exposure concentra-
tion by  more  than  a  factor of  10  before uncertainty  factors  were applied.
The extrapolation 1s acceptable  because  this  compound does not accumulate In
tissues,  Including  fat, and  H 1s  rapidly  excreted  In  expired air  and 1n
urine.    Furthermore, there  appear to  be  no major  systemic effects other than
narcosis even  at unusually  high  exposure levels.   The estimate of an AIS for
Inhalation  1n  mg/kg  Implicitly assumes  that  the exposure  will  be  spread
uniformly over a day.
6.2.   ACCEPTABLE INTAKE CHRONIC (AIC)
6.2.1.    Oral.  Data are  Insufficient to calculate  an AIC for  chronic oral
1ngest1on of acetone.   Data from which  a CS  for oral exposure to acetone can
be calculated have not  been located 1n the available literature.
6.2.2.    Inhalation.  The  study by Oglesby et  al. (1949)  suggested  a NOAEL
at  <21,500  ppm  for  workers exposed  to  acetone,  but  the lack  of  properly
matched  controls and uncertainties  about  levels of exposure preclude the use
of this  study 1n quantitative risk assessment.
    An  Interim chronic  Inhalation AOI  can be derived  from the Interim sub-
chronic  Inhalation ADI  of  2096  mg/day by applying an additional uncertainty
factor  of 10  to  convert subchronlc to chronic  exposure.   This  results 1n an
AIC of 209.6 mg/day  for a  70 kg human.   This estimate  1s  1n  the same range,
but more conservative than  an  estimate that  could be derived  using the most
conservative criterion  for occupational  exposure  [NIOSH,  1978  (250  ppm)].
The estimate of  an  AIC  for Inhalation In units of mg/day Implicitly assumes
that the exposure will  be  uniformly spread over  the  day.   Data from which a
CS  for  Inhalation  exposure  to  acetone can  be  calculated  have  not  been
located 1n the available literature.
                                     -11-

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6.3.   CARCINOGENIC POTENCY (q.,*)
6.3.1.   Oral.   Data   are   Insufficient  to   calculate   a   q  *   for  oral
exposure to acetone.
6.3.2.   Inhalation.   Data  are  Insufficient  to  calculate  a  q  *  for  expo-
sure to acetone by Inhalation.
                                     -12-

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                                     -20-

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                                                       APPENDIX



                                              Summary Table  for Acetone
i
ro
Species Experimental Effect
Dose/Exposure
Inhalation
AIS rat 19,000 ppm transient decrease
In body weight
AIC rat 19,000 ppm transient decrease
In body weight
Maximum
composite
score
Oral
AIS NA NA NA
AIC NA NA NA
Maximum
composite
score
Acceptable Intake
(AIS or AIC)

2096 mg/day
209.6 mg/day
ND

ND
ND
ND
Reference

Bruckner and
Peterson, 1981
Bruckner and
Peterson, 1981


NA
NA

     ND = Not derived; NA = not applicable

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