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Chapter 23

Proposed Revisions to Product Chemistry Data Requirements for Registration of Pesticide Chemicals

Downloaded by SUFFOLK UNIV on January 18, 2018 | http://pubs.acs.org Publication Date: August 1, 2002 | doi: 10.1021/bk-2002-0824.ch023

Sami Malak and Deborah McCall Office of Pesticide Programs, U.S. Environmental Protection Agency, Mail Stop 7505C, Ariel Rios Building, 1200 Pennsylvania Avenue, N. W., Washington, DC 20460

This chapter focuses on product chemistry data requirements for registration ofpesticide chemicals. The table ofrequirements on page18ofthe Harmonized OPPTS Test Guidelines, Series 830, Product Properties (1996) is discussed. The table groupes all requirements into Group "A" pertaining to product's identity, composition, and analysis; and group "B" pertaining to the physical/chemical properties. The table lists the new OPPTS Harmonized Test Guidelines, Series 830 Reference Numbers (GRNs) and the old OPP numbers of 1982. One column in the table lists the requirements for registration of a technical grade active ingredients (TGAI), whereas the last two columns list what appears to be the requirements for non-integrated manufacturing-use (MP) and end-use (EP) products. Revisions to the table of requirements and the guidelines are proposed including definitions, classification and data requirements for integrated products, and assertion of the self-certification program stipulated in PR Notice 98-1.

174

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Introduction The congressional mandate of The Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA) and the Federal Food, Drug, and Cosmetic Act (FFDCA) as amended by the Food Quality Protection Act (FQPA) of August 3,1996 (1) gives the Office of Pesticide Programs (OPP) of the Environmental Protection Agency (EPA) the authority to regulate pesticide, uses, storage, disposal, and transportation in the United States, FIFRA was enacted in 1947 and was last amended by the FPQA in 1996, which added the FFDCA. Since 1947 pesticide regulations and tolerances were administered by the United States Department ofAgriculture (USDA) and the Food & Drug Administration (FDA) until this authority was transferred to the recently created EPA in 1970. The EPA has modified the Code ofFederal Regulations (CFR) Titles 21 and 40 (2, 3, 4) and published several series of guidelines with the last revision in 1996 entitled "OPPTS Test Guidelines"(5, 6, 7, 8). The Guidelines are augmented by Pesticide Registration Notices (PR), Federal Register Notices (FR), The Blue Book (9), The Label Review Manual/Consumer Labeling Initiative (10), Standard Operating Procedures (SOPs),and Standard Evaluation Procedures (SEPs). OPPTS Test Guidelines, Series 830, Product Properties (6), was developed through a process of harmonization that blended the testing guidance of the Office of Pollution Prevention and Toxics (OPPTS) and the Organization for Economic Cooperation and Development (OECD). All EPA publications can be downloadedfromthe internet at: http://www.epa.gov/pesticides.

What Is Product Chemistiy? Product chemistry is the science that elucidates the chemistry, identity, composition, analysis and properties of pesticide products. Pesticides can be classified into conventional (including antimicrobials), biochemical and microbial pesticide products, which are reviewed by the following divisions: (a) Registration Division (RD) - Registration of conventional pesticides intended for food and non-food uses; (b) Antimicrobials Division (AD) - Registration of antimicrobial pesticides; (c) Biological and Pollution Prevention Division (BPPD) - Registration of biochemical and microbial pesticides; (d) Special Review and Reregistration Division (SRRD) - Reregistration of pesticides registered prior to November 1, 1984, also pesticides older than 15 years after expiration of the exclusive use period: and (e) Health Effects Division (HED) Reviews submissions of technical grade active ingredients (TGAI) undergoing reregistration.


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Why Is Product Chemistry Needed? The regulatory data requirements for product chemistry are outlined in 40 CFR §158.150 to §158.190 for chemical pesticides, §158.690 for biochemical pesticides, and §158.740 for microbial pesticides. Detailed guidance on how to conduct these studies are outlined in OPPTS Test Guidelines Series 830, Product Properties (6); OPPTS Test Guidelines, Series 880, Biochemical Test Guidelines (7); OPPTS Test Guidelines, Series 885, Microbial Pesticides Test Guidelines, Overview of Microbial Pest Control Agents (8), and OPPTS Test Guidelines, Series 810, Product Efficacy (5). Listed below are some of the regulatory requirements surrounding the need for product chemistry: 1. 2. 3. 4. 5. 6. 7. 8. 9.

Identification and characterization of each ingredient in pesticide products. Risk assessment. Environmental Fate assessment. Reentry determination and labeling precautions pertaining to worker protection. Labeling directions pertaining to tank mixes and spray applications. Labeling ingredient statement, precautionary statements, the physical or chemical hazards statement, and storage and disposal statement. Expressing product's composition and some properties on the Confidential Statements of Formula (CSF). Developing the Reregistration Eligibility Documents (REDs). Public inquiry: chemical spills, injuries to the flora and fauna, uses, contamination to various compartments of the environment, still birth, drift, degradation, efficacy,fishkill, leaching, runoff, marketing, storage, disposal, transportation, analytical methods, flammability, corrosivity, and explodability.

Product Chemistry Data Requirements for Registration of Pesticide Chemicals OPPTS Test Guidelines, Series 830 (6) groups product chemistry data requirements into Group "A", which pertains to product identity, composition, and analysis; and Group "B", which pertains to physical/chemical properties. The table of requirements cited on page 18 of the guidelines lists OPPTS Harmonized Series-830 Guideline Reference Numbers (GRNs) and the old OPP numbers. One column in the table lists the requirements for registration of a technical grade active ingredient (TGAI), whereas the last two columns list what



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appears to be the requirements for non-integrated manufacturing-use (MP) products and end-use (EP) products. With the exception of TGAIs, the table of requirements, however, does not address specific requirements for the remaining integrated products, which are: pure active ingredients (PAI), MP/EP technicals, MP/EP manufactured from registered or non-registered sources or sources of an unknown composition to the EPA, MP/EP formulated from non-registered sources or sources of an unknown composition to the EPA, and MP/EP formulated from registered sources in which a chemical reaction took place resulting in the formation of new ingredients. Further, the table cites three methods under different GRNs on partition coefficient and two on water solubility as if they are three and two requirements, respectively. Also, the table cites two requirements from the Environmental Fate Guidelines, Series 835 (UV/VIS absorption and particle size,fiberlength, and diameter distribution), where particle size is not listed in the index and inadvertently omitted the requirement for solubility in organic solvents. Future upgrades to the table of requirements and the guidelines are proposed in this chapter.

Proposed Upgrades to the Table of Requirements These proposed revisions would make it easier for the regulated pesticide industry to follow regulations and comply with the specific requirements. The proposed revisions are intended to address the many issues cited in this chapter, the answer to which cannot be found in the regulations. Examples: what are the requirements for a product manufactured or formulated from non-registered sources or sources of an unknown composition to the EPA? Similarly, what are the requirements for a pure active ingredient (PAI) and MP/EP technicals? The proposed revisions were developed while working on the self-certification program and the release of PR Notice 98-1 on "self-certification of product chemistry data." In that notice, the agency introduced a new term, "nonintegrated pesticide products", defined as "manufacturing-use and end-use products formulated from registered sources with no intended chemical reaction." The agency regards this as a step in the right direction toward classifying all products into two major classes: "non-integrated" accounting for approximately two thirds of all pesticides, and "integrated" accounting for the other one-third. This classification will focus our attention on re-structuring the table of requirements and propose a definition, classification, and requirements for integrated products as shown in Table I. The proposed revisions to the table of requirements are as follows:


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Table I. Proposed Classification and Product Chemistry Data Requirements for Integrated Pesticide Products


Number and Type of Each Class

Data Requirements

1

TGAI

Listed in the table of requirements

2

PAI

Same as for the TGAI using the PAI as the test substance

3 & 4

MP/EP that are TGAIs

All the requirements where applicable

5& 6

MP/EP manufactured from registered sources

All the requirements where applicable

7& 8

MP/EP manufactured from non-registered sources

A l l the requirements where applicable . Carryover impurities must be identified on all the CSFs of the data owner

9& 10

MP/EP manufactured from sources of an unknown composition to the EPA (that does not permit its inspection by the Agency under FIFRA sec.9(a) prior to its use in the process)

All the requirements where applicable on each MP/EP and on each source in the product prior to manufacturing or by isolating each source. If the sources can not be isolated, data are required on the practical equivalent to the TGAI of each source. Carryover impurities must be identified on all CSFs of the data owner

11 & 12

MP/EP formulated from non-registered sources

Same as for non-integrated products only if the full data on each source were submitted to the Agency and found adequate. Carryover impurities must be identified on all the CSFs of the data owner

1

1

1

1


179 Table I. Continued 13

&


14

15

& 16

MP/EP formulated from sources of an unknown composition to the EPA

Same as for non-integrated products plus the full data requirements on each source in the product prior to formulation or by isolating each source. If the sources can not be isolated, data are required on the practical equivalent to the TGAI of each source. If known, carryover impurities must be identified on all CSFs of the data owner

MP/EP formulated from A l l the requirements registered sources in which a applicable chemical reaction took place resulting in the formation of new ingredients

where

1

l

GRNs 830.1550 to 830.7950 using the test substances recommended in the table of requirements, also refer to the conditional requirements listed as footnotes to the Table in 40 CFR §158.190.



180 1. Delete the column citing outdated OPP guideline numbers. 2. Combine three methods for partition coefficient in one requirement (GRNs 8570.7550, 830.7560 & 830.7570). 3. Combine two methods for water solubility in one requirement (GRNs 830. 7840 & 830.7850). 4. Include a test for solubility in organic solvents (GRN-xxxx). 5. GRNs 830.7050 (UV/VIS absorption) and 830.7520 (Particle size, fiber length, and diameter distribution) should be moved to Environmental Fate Guidelines, Series 835. The former pertains to photodegradation and the latter pertains to drift to non-target organisms, both are Environmental Fate requirements. GRN 830.7520 was inadvertently omittedfromthe table of requirements. 6. Designate the last two columns for non-integrated products. The case-by case for submittal of samples (GRN 830.1900) can be explained as such: "in situations of interference and/or chemical reaction resulting in the formation of new ingredients" to include: preliminary analysis (GRNs 830.1700), and modified or new enforcement analytical methods (GRN 830.1800). 7. Delete the requirement for GRN 830.1650 (formulation process) for manufactured products. 8. Delete the requirement for GRN 830.1620 (production process) for formulated products. 9. Delete the requirement for GRN 830.1670 (discussion of formation of impurities) for non-integrated products.

Proposed Upgradestothe Guidelines 1. Integrate the self-certification program stipulated in PR Notice 98-1 :

This program is voluntary and is intended to simplify and accelerate the processing of applications for registration and reregistration and saves paperwork and manpower to the agency and the regulated pesticide industry while maintaining protection of public health and the environment. The PR Notice directed registrants/applicants to submit an abstract summary of the physical and chemical properties ofnon-integrated pesticide products on EPA Form 8570-36 (Attachment-1 to PR Notice 98-1). The full data can be retained in their files to be submitted upon request. A self-certification statement, EPA Form 8570-37, must be signed and dated by the applicant/registrant certifying that the submitted information was conducted in full compliance with the regulations (Attachment-2 to PR Notice 98-1). The PR Notice applies to applications for registration and reregistration of manufacturing-use and end-use products of chemical, biochemical and



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manufacturing-use and end-use products of chemical, biochemical and microbial pesticide products produced by a "non-integrated formulation system." To be eligible for self-certification, a product must be formulated from registered sources(s) with no intended chemical reaction. The definition "non-integrated products" has promoted our re-thinking on "the nature and the specific requirements for integrated products" as proposed in this chapter (Table I). Applicants/registrants not complying with PR Notice 98-1 must submit the full data requirements of the physical/chemical properties of all products. 2. Add a definition for non-integrated products,firstdefined in PRN 98-1 (/1): "formulated productsfromregistered sources with no intended chemical reaction." 3. A definition for pure active ingredient (PAI): equals to or more than 99% pure? 4. A definition for insolubility in water: less than 1.00 ppm? 5. Allow ranges for the pH (within 2 units, e.g., 7-9) and density (not to exceed 25% of the lower value, e.g., 40 to 50 lb/ft ). 6. A definition and guidance on repacks: "no data except when diluted." 7. Explanation of the nominal concentration (see explanations in this chapter). 8. Specificity in the following terms: integrated vs. non-integrated products, manufactured vs. formulated products; TGAI vs. PAI; and nominal concentration vs. percentage by weight. 9. Chemical formula change: a change in manufacturing and/or site data requirements; and a change in formulation and/or site data requirements. 10. Method accountability for manufactured products *98% (12). 11. Concentrations for inert ingredients to be expressed as percentage by weight (no nominals because each is composed of multiple ingredients). 12. Wider limits for the ingredients can be accepted if explained as per the regulations of 40 CFR §158.175(c). 13. For consistency with the regulations in 40 CFR §158.150, delete the requirements for lower limits for impurities. 14. Specific guidance to the GLP requirements: [a] six studies require full compliance with the GLP standards of 40 CFR §160.135(a) which are: preliminary analysis, stability, partition coefficient, aqueous and nonaqueous solubility, storage stability, and vapor pressure - GLP and quality assurance statements are required; [b] the remaining studies in Group "B"require partial compliance with the GLP standards of40 CFR §160.135(b) - a GLP and quality assurance statements are required; [c] except for the enforcement analytical method, the remaining studies in Group "A" are descriptive studies, erroneously included as requiring partial compliance, require no compliance with the GLP standards; and [d] proposed 3


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15.

16. 17.

18.

the guidelines: method validation, accuracy, and precision must be conducted by a GLP laboratory pa-forming any or all of the following three studies: preliminary analysis, stability, storage stability. It should be noted that analytical methods are required for all integrated products and on a case-by-case situation for non-integrated products (where there is interference and/or chemical reaction resulting in the formation of new ingredients. No requirements for validated published methods. Aged and number of samples needed for analysis ofhalogenated dibenzodioxins, dibenzofiirans; hexa & penta chlorobenzene; anilines; hydrazines; sodium nitrite; list 1 inerts; and others of toxicological concern similar to the recommendations for nitrosamines on page 9 of the guidelines. Low level of quantitation (LOQ ), similar to those in 40 CFR 766.27 (5), level of acceptability for ingredients of toxicological concern and what should be listed on pesticide labels? Upgrade GRN 830.1700 (preliminary analysis) to explain (a) What is required for non-integrated products?; (b) What is meant by "a statement of the composition of the practical equivalent to the TGAIT' Does it mean the acid equivalent? How about production processes that do not involve an acid/base neutralization?; and (c) if the statement of composition is satisfied, should we ignore the remaining requirements? Furthermore, the statement of composition submitted by a formulator using a source of an unknown composition to the EPA is not adequate as that submitted by the manufacturer. It is the manufacturer who knows the exact composition of his/her product, particularly where components of toxicological concern may be present. Re-define integrated products: "all products except non-integrated."

Highlighting the Differences Between TGAIs, PAIs, MPs, and EPs Technical Grade of Active Ingredient

• • •

A material containing an active ingredient that will prevent, destroy, repel, or mitigate any pest or act as a plant growth regulator, defoliant, desiccant or nitrogen stabilizer. TGAI can be MP or EP; Produced on a commercial or pilot-plant production scale; and Contains no inerts, except those used for purification. Products involving chemical reaction can be represented by the following equation: reactants A +Β TGAI, composed of PAI (nominal concentration) + residuals from the starting materials + impurities + contaminants + side reactions +


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degradation products + residuals of solvents used for purification (must be claimed on the CSF as residual solvents). Pure Active Ingredient


•

It is the purestformof a pesticide with a purity equals to or more than 99%.

Manufacturing-Use Product

• • •

Any pesticide product other than an end-use product; A labeling stating "for use in formulating other products"; and May contain solvents and/or stabilizers.

End-Use Product

• •

Pesticide product whose labeling includes directions for use; and Labeling does not state that it be used in formulating or manufacturing other products.

HowtoExpress Nominal Concentrations and Upper/Lower Certified Limits on the Labels and CSFs According to the "Standard Certified Limits" of 40CFR§ 158.175(b)(2), where Ν = percentage nominal concentration for manufactured products, and percentage by weight for formulated products: Ν sl.0% ±10.0%; 1.0% < Ν

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