Chemicals Under Review for November 2017

Michigan Department of Environment, Great Lakes, and Energy sent this bulletin at 11/08/2017 08:05 AM EST
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Five new chemicals were added to the Chemicals Under Review list this past month.

 

CAS No.

Chemical

91-08-7

2,6-Toluene diisocyanate

431-03-8

Diacetyl

584-84-9

2,4-Toluene diisocyanate

25265-71-8

Dipropylene glycol

26471-62-5

Dipropylene glycol

 

Two chemicals were added and twelve chemicals were updated in the ITSL/IRSL database this past month with the following screening levels.

 

CAS No.

Chemical

ITSL

(μg/m³)

IRSL

(μg/m³)

SRSL

(μg/m³)

Averaging

Time

105-46-4

sec-Butyl acetate

2,400

 

 

8-hour

107-21-1

Ethylene glycol

4,700

 

 

1-hour

107-98-2

Propylene glycol monomethyl ether

3,700

 

 

1-hour

108-10-1

Methyl isobutyl ketone (MIBK)

 

2

20

annual

108-65-6

Propylene glycol monomethyl ether acetate

5,400

 

 

1-hour

110-19-0

iso-Butyl acetate

2,400

 

 

8-hour

118-74-1

Hexachlorobenzene

0.35

 

 

24-hour

123-86-4

n-Butyl acetate

2,400

 

 

8-hour

540-88-5

tert-Butyl acetate

2,400

 

 

8-hour

872-50-4

n-Methylpyrrolidone

5,600

 

 

24-hour

25498-49-1

Tripropylene glycol methyl ether

20

 

 

annual

29911-27-1

Dipropylene glycol

180

 

 

annual

29911-28-2

Dipropylene glycol n-butyl ether

800

 

 

24-hour

57018-52-7

Propylene glycol tert-butyl ether (PGTBE)

 

0.7

7

annual

 

The initial threshold screening level (ITSL) for all isomers of butyl acetate (n-butyl acetate [CAS No. 123-86-4], iso-butyl acetate [CAS No. 110-19-0], sec-butyl acetate [CAS No. 105-46-4], and tert-butyl acetate [CAS No. 540-88-5]) is 2,400 µg/m3 with an eight-hour averaging time.

 

The ethylene glycol (CAS No. 107-21-1) ITSL changed from 1,000 µg/m3 (one-hour averaging time) to 4,700 µg/m3 (one-hour averaging time).

 

The propylene glycol monomethyl ether (CAS No. 107-98-2) ITSL changed from 2,000 µg/m3 (annual averaging time) to 3,700 µg/m3 (one-hour averaging time).

 

The propylene glycol monomethyl ether acetate (CAS No. 108-65-6) ITSL changed from 3,000 µg/m3 (annual averaging time) to 5,400 µg/m3 (one-hour averaging time).

 

The tripropylene glycol monomethyl ether (CAS No. 25498-49-1) ITSL changed from 11 µg/m3 (annual averaging time) to 20 µg/m3 (annual averaging time).

 

The dipropylene glycol monobutyl ether (CAS No. 29911-28-2) ITSL changed from 11 µg/m3 (annual averaging time) to 800 µg/m3 (twenty-four hour averaging time).

 

There is an updated screening level for methyl isobutyl ketone (MIBK) (CAS No. 108-10-1). The previous initial risk screening level (IRSL) and secondary risk screening level (SRSL) were 1.3 and 13 µg/m3 respectively, were updated to an IRSL of 2 µg/m3 and SRSL of 20 µg/m3 (annual averaging time) based on an updated literature search.

 

The hexachlorobenzene (CAS No. 118-74-1) ITSL changed from 0.035 µg/m3 (twenty-four-hour averaging time) to 0.35 µg/m3 (twenty-four-hour averaging time).

 

The n-Methylpyrrolidone (CAS No. 872-50-4) ITSL changed from 700 µg/m3 (annual averaging time) to 5,600 µg/m3 (twenty-four-hour averaging time) based on an updated literature review.

 

The IRSL for propylene glycol tert-butyl ether (PGTBE) (CAS No. 57018-52-7) is 0.7 µg/m3 with an annual averaging time and the SRSL is 7 µg/m3 with an annual averaging time. The previous ITSL for PGTBE of 329 µg/m3 with an annual averaging time is being rescinded.

 

The ITSL for FC-247 (CAS No. 136797-56-3) was revoked because it was very dated an no longer considered appropriate.

 

To view the “Chemicals Under Review” list for November 2017, please visit the DEQ Air Quality Web page. Click on the ‘Permits’ tab, followed by the ‘Air Toxics Screening Levels’ tab located on the bottom left side of the page. The “Chemicals Under Review” list is the last item in this category.

 

Along with the new formal public review, we will continue our past practice of inviting and addressing questions or concerns about any screening levels, at any time. If you have any questions, please contact Doreen Lehner, Air Quality Division, at 517-284-6753.