美国豁免氯化胆碱残留限量要求（Choline Chloride; Exemption From the Requirement of a Tolerance）

Final Rule.

SUMMARY

This regulation establishes an exemption from the requirement of a tolerance for residues of the Choline Chloride (Acetyl Choline) in or on all food commodities when applied/used pre-harvest and used in accordance with label directions and good agricultural practices. CP Bio, Inc., submitted a petition to EPA under the Federal Food, Drug, and Cosmetic Act (FFDCA), requesting an exemption from the requirement of a tolerance. This regulation eliminates the need to establish a maximum permissible level for residues of Choline Chloride.

TABLE OF CONTENTS

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DATES:

ADDRESSES:

FOR FURTHER INFORMATION CONTACT:

SUPPLEMENTARY INFORMATION:

I. General Information

A. Does this action apply to me?

B. How can I get electro nic access to other related information?

C. How can I file an objection or hearing request?

II. Background and Statutory Findings

III. Toxicological Profile

A. Overview of Choline Chloride

B. Biochemical Pesticide Toxicology Data Requirements

C. EPA's Safety Determination

IV. Aggregate Exposures

A. Dietary Exposure

B. Other Non-Occupatio nal Exposure

V. Cumulative Effects From Substances With a Common Mechanism of Toxicity

VI. Determination of Safety for U.S. Population, Infants and Children

VII. Other Considerations

A. Analytical Enforcement Methodology

B. Internatio nal Residue Limits

VIII. Conclusions

IX. Statutory and Executive Order Reviews

X. Co ngressional Review Act

List of Subjects in 40 CFR Part 180

PART 180—[AMENDED]

DATES:

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This regulation is effective December 16, 2015. Objections and requests for hearings must be received on or before February 16, 2016, and must be filed in accordance with the instructions provided in 40 CFR part 178 (see also Unit I.C. of the SUPPLEMENTARY INFORMATION).

ADDRESSES:

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The docket for this action, identified by docket identification (ID) number EPA-HQ-OPP-2015-0023, is available at http://www.regulations.gov or at the Office of Pesticide Programs Regulatory Public Docket (OPP Docket) in the Enviro nmental Protection Agency Docket Center (EPA/DC), West William Jefferson Clinton Bldg., Rm. 3334, 1301 Co nstitution Ave. NW., Washington, DC 20460-0001. The Public Reading Room is open from 8:30 a.m. to 4:30 p.m., Mo nday through Friday, excluding legal holidays. The telephone number for the Public Reading Room is (202) 566-1744, and the telephone number for the OPP Docket is (703) 305-5805. Please review the visitor instructions and additio nal information a bout the docket available at http://www.epa.gov/dockets.

FOR FURTHER INFORMATION CONTACT:

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Robert McNally, Biopesticides and Pollution Prevention Division (7511P), Office of Pesticide Programs, Enviro nmental Protection Agency, 1200 Pennsylvania Ave. NW., Washington, DC 20460-0001; main telephone number: (703) 305-7090; email address: BPPDFRNotices@epa.gov.

SUPPLEMENTARY INFORMATION:

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I. General Information

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A. Does this action apply to me?

You may be potentially affected by this action if you are an agricultural producer, food manufacturer, or pesticide manufacturer. The following list of North American Industrial Classification System (NAICS) codes is not intended to be exhaustive, but rather provides a guide to help readers determine whether this docu ment applies to them. Potentially affected entities may include:

Crop production (NAICS code 111).

Animal production (NAICS code 112).

Food manufacturing (NAICS code 311).

Pesticide manufacturing (NAICS code 32532).

B. How can I get electro nic access to other related information?

You may access a frequently updat ed electro nic version of 40 CFR part 180 through the Government Printing Office's e-CFR site at http://www.ecfr.gov/cgi-bin/text-idx?&c=ecfr&tpl=/ecfrbrowse/Title40/40tab_02.tpl.

C. How can I file an objection or hearing request?

Under FFDCA section 408(g), 21 U.S.C. 346a, any person may file an objection to any aspect of this regulation and may also request a hearing on those objections. You must file your objection or request a hearing on this regulation in accordance with the instructions provided in 40 CFR part 178. To ensure proper receipt by EPA, you must identify docket ID number EPA-HQ-OPP-2015-0023 in the subject line on the first page of your submission. All objections and requests for a hearing must be in writing, and must be received by the Hearing Clerk on or before February 16, 2016. Addresses for mail and hand delivery of objections and hearing requests are provided in 40 CFR 178.25(b).

In addition to filing an objection or hearing request with the Hearing Clerk as described in 40 CFR part 178, please submit a copy of the filing (excluding any Co nfidential Business Information (CBI)) for inclusion in the public docket. Information not marked co nfidential pursuant to 40 CFR part 2 may be disclosed publicly by EPA without prior notice. Submit the non-CBI copy of your objection or hearing request, identified by docket ID number EPA-HQ-OPP-2015-0023, by one of the following methods:

Federal eRulemaking Portal: http://www.regulations.gov. Follow the o nline instructions for submitting comments. Do not submit electro nically any information you co nsider to be CBI or other information whose disclosure is restricted by statute.

Mail: OPP Docket, Enviro nmental Protection Agency Docket Center (EPA/DC), (28221T), 1200 Pennsylvania Ave. NW., Washington, DC 20460-0001.

Hand Delivery: To make special arrangements for hand delivery or delivery of boxed information, please follow the instructions at http://www.epa.gov/dockets/contacts.html. Additio nal instructions on commenting or visiting the docket, along with more information a bout dockets generally, is available at http://www.epa.gov/dockets.

II. Background and Statutory Findings

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In the Federal Register of March 4, 2015 (80 FR 11611) (FRL-9922-68), EPA issued a docu ment pursuant to FFDCA section 408(d)(3), 21 U.S.C. 346a(d)(3), announcing the filing of a pesticide tolerance petition (PP 4F8287) by CP Bio, Inc., 4802 Murrieta Street, Chino, CA 91710. The petition requested that 40 CFR part 180 be amended by establishing an exemption from the requirement of a tolerance for residues of Choline Chloride in or on all food commodities (when applied pre-harvest). That docu ment referenced a summary of the petition prepared by the petitio ner CP Bio, Inc., which is available in the docket, http://www.regulations.gov. There were no substantive comments received in respo nse to the notice of filing.

Section 408(c)(2)(A)(i) of FFDCA allows EPA to establish an exemption from the requirement for a tolerance (the legal limit for a pesticide chemical residue in or on a food) o nly if EPA determines that the exemption is “safe.” Section 408(c)(2)(A)(ii) of FFDCA defines “safe” to mean that “there is a reaso nable certainty that no harm will result from aggregate exposure to the pesticide chemical residue, including all anticipated dietary exposures and all other exposures for which there is reliable information.” This includes exposure through drinking water and in residential settings, but does not include occupatio nal exposure. Pursuant to FFDCA section 408(c)(2)(B), in establishing or maintaining in effect an exemption from the requirement of a tolerance, EPA must take into account the factors set forth in FFDCA section 408(b)(2)(C), which require EPA to give special co nsideration to exposure of infants and children to the pesticide chemical residue in establishing a tolerance and to “ensure that there is a reaso nable certainty that no harm will result to infants and children from aggregate exposure to the pesticide chemical residue.-. . . ” Additionally, FFDCA section 408(b)(2)(D) requires that the Agency co nsider “available information co ncerning the cumulative effects of a particular pesticide's residues” and “other substances that have a common mechanism of toxicity.”

EPA performs a number of analyses to determine the risks from aggregate exposure to pesticide residues. First, EPA determines the toxicity of pesticides. Second, EPA examines exposure to the pesticide through food, drinking water, and through other exposures that occur as a result of pesticide use in residential settings.

III. Toxicological Profile

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Co nsistent with FFDCA section 408(b)(2)(D), EPA has reviewed the available scientific data and other relevant information in support of this action and co nsidered its validity, completeness and reliability, and the relatio nship of this information to human risk. EPA has also co nsidered available information co ncerning the variability of the sensitivities of major identifiable subgroups of consumers, including infants and children.

A. Overview of Choline Chloride

Choline Chloride is an ammo nium salt that readily dissociates into two constituents—Choline and Chloride. It presents as a white crystalline solid that is odorless. Each co nstituent is ubiquitous in the environment, co nstitutes a regular part of the human diet, and serves many critical functions in the human body. Choline is found in such foods as egg yolk, vegetables and animal fat. It is a precursor of a vital neurotransmitter; and it is critical for the structural integrity of cell membranes and various me tabolic functions. Chloride is also a regular part of the human diet, particularly as a co nstituent of edible salt, and serves many functions in human biology. Chiefly, Chloride is an essential electrolyte respo nsible for maintaining acid/ba se balance, transmitting nerve impulses and regulating fluid in and out of cells.

Choline Chloride is already approved for use by EPA as an inert ingredient in pesticide products without numerical limitation for pre-harvest use (40 CFR 180.920). Additionally, Choline Chloride is designated as GRAS (Generally Recognized as Safe) and is approved by the Food and Drug Administration (FDA) as a human nutrient under 21 CFR 182.8252 and as a nutrient in animal feeds under 21 CFR 582.5252.

As a biopesticide, Choline Chloride is co nsidered a plant growth regulator (PGR) intended for use to increase growth and decrease stress in growing crops. It has a non-toxic mode of action; and as with most PGRs, it is applied at low co ncentrations because use at high co ncentrations result in detrimental effects to the plant.

B. Biochemical Pesticide Toxicology Data Requirements

All applicable mammalian toxicology data requirements supporting the petition to establish an exemption from the requirement of a tolerance for the use of Choline Chloride as an active ingredient for use as a PGR on food crops have been fulfilled. All acute toxicology data requirements were fulfilled through guideline studies. The Acute Oral Toxicity Category is III; all other categories are IV. Additionally, the information submitted in support of the application indicate that Choline Chloride is non-mutagenic and that it is not subchro nically or developmentally toxic. Subchro nic oral toxicity, mutagenicity and developmental toxicity data requirements were satisfied through scientific literature. Subchro nic dermal and inhalation requirements were waived for lack of exposure. (A complete assessment of the toxicology submission for Choline Chloride can be found in the docket.)

C. EPA's Safety Determination

EPA e valuated the available toxicity and exposure data on Choline Chloride and co nsidered its validity, completeness, and reliability, as well as the relatio nship of this information to human risk. A full explanation of the data upon which EPA relied and its risk assessment ba sed on that data can be found within the August 11, 2015, docu ment entitled “Federal Food, Drug, and Cosmetic Act (FFDCA) Co nsiderations for Choline Chloride.” This docu ment, as well as other relevant information, is available in the docket for this action as described under ADDRESSES. ba sed upon its e valuation, EPA co ncludes that there is a reaso nable certainty that no harm will result to the U.S. population, including infants and children, from aggregate exposure to residues of Choline Chloride. Therefore, an exemption from the requirement of a tolerance is established for residues of Choline Chloride in or on all food commodities when applied pre-harvest and used in accordance with label directions and good agricultural practices.

IV. Aggregate Exposures

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In examining aggregate exposure, FFDCA section 408 directs EPA to co nsider available information co ncerning exposures from the pesticide residue in food and all other non-occupatio nal exposures, including drinking water from ground water or surface water and exposure through pesticide use in gardens, lawns, or buildings (residential and other indoor uses).

A. Dietary Exposure

Food Exposure. Dietary exposure to the pesticidal residues of Choline Chloride is expected to be negligible. (1) Choline Chloride is a PGR and is necessarily applied at low concentrations. (High co ncentrations result in detrimental effects to the plant). (2) Choline Chloride biodegrades rapidly. A MITI-I test demo nstrated that Choline Chloride is 93% degraded within 14 days. (3) As a salt, Choline Chloride dissociates readily when in co ntact with water, making its persistence as a residue even more unlikely.

Should exposure occur, however, minimal to no risk is expected for the general population, including infants and children. Notably, humans are already dietarily exposed to Choline Chloride. It is produced endogenously, and is found naturally in foods in the human diet. Indeed, it is co nsidered an essential human dietary component, serving critical functions in nerve transmission, cell membrane integrity and lipid me tabolism.

Drinking Water Exposure. No significant residues of Choline Chloride are expected in drinking water when products are used according to label instructions. The active ingredient is applied terrestrially at low concentrations; it is very soluble in water; and it biodegrades rapidly, o nce applied. As such, any residues of Choline Chloride in drinking water are anticipated to be negligible.

It should be additio nally noted that both Choline and Chloride, the co nstituents of Choline Chloride, are ubiquitous in the environment; and there is a long history of incidental, but minor, exposure through drinking water.

B. Other Non-Occupatio nal Exposure

Non-occupatio nal exposure to Choline Chloride residues are not expected. Choline Chloride is not intended for use in residential settings; it is intended for agricultural use only. Nonetheless, even in the event of incidental exposure, minimal to no risk is expected due to the low toxicity of the chemical as explained in the risk assessment found in the docket.

V. Cumulative Effects From Substances With a Common Mechanism of Toxicity

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Section 408(b)(2)(D)(v) of FFDCA requires that, when co nsidering whether to establish, modify, or revoke a tolerance, the Agency co nsider “available information” co ncerning the cumulative effects of a particular pesticide's residues and “other substances that have a common mechanism of toxicity.”

EPA has not found Choline Chloride to share a common mechanism of toxicity with any other substances, and Choline Chloride does not appear to produce a toxic me tabolite produced by other substances. For the purposes of this tolerance action, therefore, EPA has assumed that Choline Chloride does not have a common mechanism of toxicity with other substances. For information regarding EPA's efforts to determine which chemicals have a common mechanism of toxicity and to e valuate the cumulative effects of such chemicals, see EPA's Web site at http://www.epa.gov/pesticides/cumulative.

VI. Determination of Safety for U.S. Population, Infants and Children

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FFDCA section 408(b)(2)(C) provides that, in co nsidering the establishment of a tolerance or tolerance exemption for a pesticide chemical residue, the EPA shall assess the available information a bout co nsumption patterns among infants and children, special susceptibility of infants and children to pesticide chemical residues, and the cumulative effects on infants and children of the residues and other substances with a common mechanism of toxicity. In addition, FFDCA section 408(b)(2)(C) provides that the EPA shall apply an additio nal tenfold (10X) margin of safety for infants and children in the case of threshold effects to account for prenatal and postnatal toxicity and the completeness of the databa se on toxicity and exposure, unless the EPA determines that a different margin of safety will be safe for infants and children. This additio nal margin of safety is commo nly referred to as the Food Quality Protection Act Safety Factor. In applying this provision, the EPA either retains the default value of 10X, or uses a different additio nal or no safety factor when reliable data are available to support a different additio nal or no safety factor.

Because there are no threshold effects associated with this biochemical, an additio nal margin of safety for infants and children is not necessary.

EPA has determined that there are no foreseeable dietary risks to the U.S. population, including infants and children, from the pesticidal use of Choline Chloride. Exposure to the residues of Choline Chloride is expected to be negligible due to the low co ncentrations associated with its use as a PGR, its high solubility and its rapid biodegradability. Moreover, any exposure to Choline Chloride residues are not expected to pose a risk. No toxic endpoints have been identified for Choline Chloride. There has been a long history of significant human dietary and endogenous exposure without docu mented incident. And the co nstituents of Choline Chloride are known to be readily me tabolized.

VII. Other Considerations

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A. Analytical Enforcement Methodology

An analytical method is not required for enforcement purposes since the Agency is establishing an exemption from the requirement of a tolerance without any numerical limitation.

B. Internatio nal Residue Limits

In making its tolerance decisions, EPA seeks to harmo nize U.S. tolerances with internatio nal standards whenever possible, co nsistent with U.S. food safety standards and agricultural practices. EPA co nsiders the internatio nal maximum residue limits (MRLs) established by the Codex Alimentarius Commission (Codex), as required by FFDCA section 408(b)(4). The Codex Alimentarius is a joint United Nations Food and Agriculture Organization/World Health Organization food standards program, and it is recognized as an internatio nal food safety standards-setting organization in trade agreements to which the United States is a party. EPA may establish a tolerance that is different from a Codex MRL; however, FFDCA section 408(b)(4) requires that EPA explain the reasons for departing from the Codex level.

The Codex has not established a MRL for Choline Chloride.

VIII. Conclusions

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ba sed on its assessment of Choline Chloride, EPA co ncludes that there is a reaso nable certainty that no harm will result to the general population, or to infants and children, from aggregate exposure to Choline Chloride. EPA is therefore establishing an exemption from the requirement of a tolerance for residues of Choline Chloride in or on all food commodities when applied pre-harvest in accordance with label directions and good agricultural practices.