UNITED STATES ENVIRONMENTAL PROTECTION AGENCY

WASHINGTON, DC 20460

OFFICE OF PREVENTION, PESTICIDES, AND TOXIC SUBSTANCES

 

						

October 24, 2007

MEMORANDUM

SUBJECT:	Product Chemistry Chapter for the Organic Acid Esters of
Phosphoric Acid Reregistration Eligibility Decision Document (RED).

TO:	Diane Isbell, Team Leader

	Regulatory Management Branch II

	Antimicrobials Division (7510P)

		

FROM:	Talia Lindheimer, Chemist, Team II

	Risk Assessment and Science Support Branch (RASSB)

Antimicrobials Division (7510P)

THRU:	Norm Cook, Branch Chief

Risk Assessment and Science Support Branch (RASSB)

Antimicrobials Division (7510P)

Case No.: 	Not Available

CAS #’s: 	 1070-03-7, 68649-38-7, 120579-32-0

DP Barcode:	347016

PC Codes:	111286, 129079, 129080	

Executive Summary

	There are three organic acid esters of phosphoric acid registered with
the USEPA as either a fungicide, disinfectant, bacteriostat and
microbiocide.  Despite the fact that each chemical is identified by an
individual CAS number there is only information available in the
literature as well as on the internet for the chemical identified by CAS
# 1070-03-7.    As a result, the chemical information summarized below
is assumed to be representative for all three CAS #’s included in this
case.  There is product chemistry information that had been previously
submitted to the Agency to support a label (EPA Registration Number
#2693-RTG) whcih been withdrawn and is no longer registered with the
USEPA.  Ultimately the best available data resulting from executing
EPA’s EPI Suite model was utilized.  These values provided can be
further refined with input from the registrants involved in this RED
case.

Chemical Identification for CAS # 1070-03-7 

Common Name:		Phosphoric acid, mono (2-ethylhexyl) exter

Chemical Names:		Phosphoric acid, bis(2-ethylhexyl) ester with
2,2’-(cocoalkylimino)bis(ethanol), Phosphoric acid,
mono(2-ethylhexyl)ester with diethanolamine N-coco-alkyl derivatives
(1:1).

Synonyms:			Intersept, Intersept PC-20

OPP Chemical Code:	111286, 129079, 129080

Molecular Formula: 	 C8H19O4P (provided in EPI Suite for CAS #
1070-03-7)

Figure 1:  Phosphoric Acid, mono (2-ethylhexyl) ester

The values reported in Table 1 have been obtained from EPI Suite .

Table 1: Physical/Chemical Properties for Phosphoric Acid

Parameter	Value

Molecular Weight	210.21 g/mol

Boiling Point	354.51 oC

Melting Point	81.3 oC

Vapor Pressure	5.34 x 10-07 mm Hg @ 25 oC

Log Kow	2.65

Log Koc	2.112

Solubility in Water	2192.2 mg/L

Henry’s Law Constant	6.99 x 10-10 atm m3/mol

Half Life	0.325 days



 PAGE   

Page   PAGE  1  of   NUMPAGES  4 

 Volume I –Product chemistry, PORTERSEPT HVAC with INTERSEPT Acrylic
Primer/Finish, White 3830 (EPA Registration Number #2693-RTG).  MRID
#432658-01.

 Also assumed to be representative of the physical/chemical properties
for CAS #’s 68649-38-7 and 120579-32-0

 The Estimation Programs Interface (EPI) Suite.  Windows based suite of
physical/chemical properties and environmental estimation models
developed by the US EPA’s Office of Prevention, Pesticides, and Toxic
Substances (OPPTS) and Syracuse Research Institute (SRC).    HYPERLINK
http://www.epa.gov/opptintr/exposure/docs/EPISuitedl.htm 
http://www.epa.gov/opptintr/exposure/docs/EPISuitedl.htm 

