GB/T 24691-2009 English PDF (GBT24691-2009)

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GB/T 24691-2009: Cleaning agent for fruit and vegetable
GB/T 24691-2009
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.100.40
Y 43
Cleaning agent for fruit and vegetable
果蔬清洗剂
ISSUED ON: NOVEMBER 30, 2009
IMPLEMENTED ON: MAY 01, 2010
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative references ... 4 
3 Requirements ... 5 
4 Test method ... 6 
5 Inspection rules ... 8 
6 Marking, packaging, transportation, storage ... 8 
7 Shelf life ... 9 
Appendix A (Normative) Verification method of cleaning agent for fruit and
vegetable on the removal of residual pesticides ... 10 
Appendix B (Normative) Qualitative determination of residues of cleaning
agents for fruit and vegetable ... 19 
Appendix C (Normative) Determination of anionic surfactants - Methylene blue
method (Quantitative determination of residues of cleaning agent for fruit and
vegetable) ... 21 
Appendix D (Normative) Determination of ethoxy-type surfactants - Cobalt
thiocyanate method (Quantitative determination of residues of cleaning agent
for fruit and vegetable) ... 24 
Appendix E (Normative) Determination of zwitterionic surfactants -- Gold
orange - method 2 (Quantitative determination of residues of cleaning agent for
fruit and vegetable) ... 27 
Appendix F (Normative) Determination of alkyl glycoside surfactants --
Anthrone method (Quantitative determination of residues of cleaning agent for
fruit and vegetable) ... 30 
References ... 32 
Cleaning agent for fruit and vegetable
1 Scope
This standard specifies the technical requirements, test methods, inspection
rules, markings, packaging, transportation, storage requirements for cleaning
agents for fruit and vegetable.
This standard applies to cleaning agents, that are mainly formulated with
surfactants and additives, for the purpose of cleaning fruits and vegetables.
2 Normative references
The provisions in following documents become the provisions of this Standard
through reference in this Standard. For the dated references, the subsequent
amendments (excluding corrections) or revisions do not apply to this Standard;
however, parties who reach an agreement based on this Standard are
encouraged to study if the latest versions of these documents are applicable.
For undated references, the latest edition of the referenced document applies.
GB/T 4789.2 Microbiological examination of food hygiene - Aerobic plate
count
GB/T 4789.3 Microbiological examination of food hygiene - Detection of
Coliform bacteria
GB/T 6368 Surface active agents - Determination of pH of aqueous solution
- Potentiometric method (GB/T 6368-2008, ISO 4316:1977, IDT)
GB 9985-2000 Detergents for hand dishwashing
GB/T 13173-2008 Surface active agents - Detergents - Testing methods
GB 14930.1 Hygienic standard for detergent for food tools and installations
GB/T 15818 Test method for biodegradability of surfactants
QB/T 2951 Inspecting rules for detergent products
QB/T 2952 Requirements for detergent marks and packaging
JJF1070 Rules of metrological testing for net quantity of products in
prepackages with fixed content
content shall be carried out, according to the provisions of Chapter 7 (Method
B) in GB/T 13173-2008.
4.4 Determination of pH value
It is carried out in accordance with the provisions of GB/T 6368.
4.5 Determination of methanol content (for liquid products)
After preparing the standard solution, according to the provisions of Appendix
D of GB 9985-2000, carry out the determination.
4.6 Determination of formaldehyde content (for liquid products)
It is carried out in accordance with the provisions of Appendix E of GB 9985-
2000.
4.7 Determination of arsenic content
It is carried out in accordance with the provisions of Appendix F of GB 9985-
2000.
4.8 Determination of heavy metal content
It is carried out in accordance with the provisions of Appendix G of GB 9985-
2000.
4.9 Determination of fluorescent brightener
It is carried out in accordance with the provisions of Appendix C of GB 9985-
2000.
4.10 Microbiological examination
For the total number of bacteria AND the coliform group, they are respectively
examined, in accordance with GB/T 4789.2 and GB/T 4789.3.
4.11 Determination of the biodegradability of surfactants
For the biodegradability of the surfactant, which is used in the product
formulation of the cleaning agent for fruit and vegetable, it shall be carried out
in accordance with the provisions of GB/T 15818.
4.12 Determination of net content
For the inspection, sampling method and determination rules of the net content
of the sales package of cleaning agent for fruit and vegetable, they shall be
carried out in accordance with the provisions of JJF 1070.
Appendix A
(Normative)
Verification method of cleaning agent for fruit and vegetable on the
removal of residual pesticides
A.1 Scope
This method specifies the preparation methods of pesticide emulsions AND
samples containing pesticides on the surface of vegetables; the cleaning
methods of samples, which contain pesticides on the surfaces of vegetables;
the determination method of pesticide removal rate.
This method is suitable for the determination of the removal rate of cypermethrin
and propoxur pesticides, by a cleaning agent for fruit and vegetable, which is
compounded with surfactants and additives.
The detection range of this method is 4.3 µg/mL ~ 430.0 µg/mL for cypermethrin,
1.5 µg/mL ~ 150.0 µg/mL for propoxur.
A.2 Normative references
GB/T 13174 Determination of detergency and cycle of washing property for
laundry detergents.
A.3 Principles of the method
Prepare vegetable samples with pesticides several times exceeding the limit.
Simulate actual washing conditions. After cleaning with a 0.2% cleaning agent
for fruit and vegetable solution, use the extraction and concentration method to
obtain the residual pesticides. Use high performance liquid chromatography, to
determine the amount of pesticide residues, on the surface of the vegetables
before and after cleaning. Calculate the removal rate of residual pesticides.
Compare it with the removal rate of the residual pesticides, after washing by
the water of certain hardness. The ratio is the evaluation result of the cleaning
effect of the cleaning agent for fruit and vegetable, on the residual pesticides.
A.4 Reagents
Unless otherwise specified, it only uses the confirmed analytical reagents AND
distilled or deionized water or water of equivalent purity, in the analysis
(applicable to all appendixes of this standard).
A.4.1 Anhydrous ethanol;
Weigh 5.00 g of cypermethrin and 2.50 g of propoxur. Dissolve it in 500 g of
absolute ethanol solution. After stirring evenly, use 250 mg/kg of hard water to
make its mass reach to 5000 g. Mix well. Prepare for use. The concentration of
the pesticide emulsion is: 0.1% cypermethrin and 0.05% propoxur.
A.6.3 Preparation of vegetables containing pesticides
Completely immerse the sweet beans in the pesticide emulsion for 20 minutes.
Take them out. Shake off the residual liquid droplets from the surface. Place
them in a cool place, at room temperature, for 24 hours. Divide the prepared
vegetable samples into 3 groups: one group is unwashed (the amount of
pesticides on the surface of unwashed vegetable samples is preferably 140
mg/...