[Code of Federal Regulations]
[Title 21, Volume 3]
[Revised as of April 1, 2005]
From the U.S. Government Printing Office via GPO Access
[CITE: 21CFR173.300]

[Page 135-136]
 
                        TITLE 21--FOOD AND DRUGS
 
CHAPTER I--FOOD AND DRUG ADMINISTRATION, DEPARTMENT OF HEALTH AND HUMAN 
                          SERVICES (CONTINUED)
 
PART 173_SECONDARY DIRECT FOOD ADDITIVES PERMITTED IN FOOD FOR HUMAN 
CONSUMPTION--Table of Contents
 
                   Subpart D_Specific Usage Additives
 
Sec. 173.300  Chlorine dioxide.


    Chlorine dioxide (CAS Reg. No. 10049-04-4) may be safely used in 
food in accordance with the following prescribed conditions:
    (a)(1) The additive is generated by one of the following methods:
    (i) Treating an aqueous solution of sodium chlorite with either 
chlorine gas or a mixture of sodium hypochlorite and hydrochloric acid.
    (ii) Treating an aqueous solution of sodium chlorate with hydrogen 
peroxide in the presence of sulfuric acid.

[[Page 136]]

    (iii) Treating an aqueous solution of sodium chlorite by 
electrolysis.
    (2) The generator effluent contains at least 90 percent (by weight) 
of chlorine dioxide with respect to all chlorine species as determined 
by Method 4500-ClO2 E in the ``Standard Methods for the 
Examination of Water and Wastewater,'' 20th ed., 1998, or an equivalent 
method. Method 4500-ClO2 E (``Amperometric Method II'') is 
incorporated by reference in accordance with 5 U.S.C. 552(a) and 1 CFR 
part 51. You may obtain a copy from the Center for Food Safety and 
Applied Nutrition (HFS-200), Food and Drug Administration, 5100 Paint 
Branch Pkwy., College Park, MD 20740, or the American Public Health 
Association, 800 I St. NW., Washington, DC 20001-3750. You may inspect a 
copy at the Center for Food Safety and Applied Nutrition's Library, 5100 
Paint Branch Pkwy., College Park, MD, or at the National Archives and 
Records Administration (NARA). For information on the availability of 
this material at NARA, call 202-741-6030, or go to: http://
www.archives.gov/federal--register/code--of--federal--regulations/ibr--
locations.html.
    (b)(1) The additive may be used as an antimicrobial agent in water 
used in poultry processing in an amount not to exceed 3 parts per 
million (ppm) residual chlorine dioxide as determined by Method 4500-
ClO2 E, referenced in paragraph (a)(2) of this section, or an 
equivalent method.
    (2) The additive may be used as an antimicrobial agent in water used 
to wash fruits and vegetables that are not raw agricultural commodities 
in an amount not to exceed 3 ppm residual chlorine dioxide as determined 
by Method 4500-ClO2 E, referenced in paragraph (a)(2) of this 
section, or an equivalent method. Treatment of the fruits and vegetables 
with chlorine dioxide shall be followed by a potable water rinse or by 
blanching, cooking, or canning.

[60 FR 11900, Mar. 3, 1995. Redesignated at 61 FR 14245, Apr. 1, 1996, 
as amended at 61 FR 14480, Apr. 2, 1996; 63 FR 38747, July 20, 1998; 65 
FR 34587, May 31, 2000; 70 FR 7396, Feb. 14, 2005]