Priority Existing Chemical

c)Applicants

PO Box 285

North Sydney NSW 2059

Wynn’s Australia Pty Ltd

PO Box 6096

French’s Forest Delivery Centre NSW 1640

Nulon Products Australia Pty Ltd

114 Narabang Way

Belrose NSW 2085

d)Chemical Identity and
Composition

d.1Chemical identity

Chemical Name:	Manganese tricarbonyl [(1,2,3,4,5-eta)-1-methyl-2,4-cyclopentadien-1-yl]-
CAS No.:	12108-13-3
EINECS No.:	235-166-5
Synonyms:	MMT, Methylcyclopentadienyl manganese tricarbonyl, Methylcymantrene
Trade Names:	AK-33X, Antiknock-33, CI-2, Combustion Improver-2.
Molecular Formula:	C9H7MnO3
Structural Formula:
Molecular Weight:	218

d.2Composition of commercial products

Wynn’s Australia Pty Ltd markets two MMT-containing products. Spitfire Octane Boost and Race Formula Octane Boost both contain < 5% w/w MMT in petroleum distillate.

Nulon Products Australia Pty Ltd markets three MMT-containing products. Octane Boost and Clean and Total Fuel System Cleaner both contain < 5% w/w MMT whilst Pro Strength Octane Booster contains < 10% w/w MMT, all in petroleum distillate.

e)Physical and Chemical Properties

e.1Physical state

e.2Physical properties

Table 1. Physical properties of MMT

Property	Value	Reference
Boiling point	231.67oC	ACGIH, 1991
Melting point	2.22oC	Ethyl Submission
Density at 20oC	1390 kg/m3	ACGIH, 1991
Water solubility at 25oC	0.029 g/L	Ethyl Submission
Vapour pressure at 100oC	1.24 kPa	Zenz , 1988 Ethyl Submission
at 20oC	0.01 kPa
Henry’s law constant	<10-9 Pa m3/mol	Ethyl Submission
Partition coefficient (log Pow)	3.4	Ethyl Submission
Autoignition temperature	257oC	Ethyl Submission
Flammability Limits	Lower: 0.3% at 153oC Upper: 26% at 175oC	Ethyl Submission
Flash point (closed cup)	96oC	Zenz, 1988

e.3Chemical properties

Stability: MMT decomposes when exposed to light (Kaufman et al., 1961).

Polymerisation: MMT will not undergo hazardous polymerisation.

e.4Conversion factors (at 25^oC)

f)Methods of Detection and
Analysis

f.1Identification

f.2Atmospheric monitoring methods

A similar procedure to Coe et al. (1980) for the determination of MMT in ambient air is described by Gaind et al. (1992). Airborne MMT is collected in XAD-2 containing tubes using an air-sampling pump. Determination is made by gas chromatography with an electron capture detector. The limit of detection using this protocol is 0.001 mg/m³ from a 10 L air sample.

A procedure for the determination of organic Mn in personal air samples has been described by Albemarle Corporation (1994). Determination is achieved by adsorption onto activated charcoal, followed by desorption by nitric acid, and then atomic absorption spectrophotometry. This protocol is applicable to organic Mn concentrations below 3 g Mn/mL nitric acid. The method does not distinguish between different organic Mn species. A glass fibre filter is attached to the front of the charcoal tube to remove inorganic (particulate) Mn.

A number of methods have been described for the determination of inorganic Mn in ambient air. These include x-ray fluorescence and inductivity coupled plasma atomic emission spectrophotometry (ATSDR 2000).