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GB 14936-2012 English PDF (GB14936-2012)
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GB 14936-2012: National Food Safety Standard -- Food Additives -- Diatomaceous Earth
GB 14936-2012
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
National Food Safety Standard -
Food Additives - Diatomaceous Earth
食品添加剂 硅藻土
ISSUED ON: DECEMBER 25, 2012
IMPLEMENTED ON: JANUARY 25, 2013
Issued by: Ministry of Health of the PRC
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Technical requirements ... 4
Appendix A Inspection methods ... 5
National Food Safety Standard -
Food Additives - Diatomaceous Earth
1 Scope
This Standard is applicable to the food additives diatomaceous earth of
diatomaceous earth dry products, pickling products, roasting products, fluxing
roasting products prepared by processes such as drying, roasting, pickling,
classification and with natural diatomaceous earth as raw materials.
2 Technical requirements
2.1 Sensory requirements: It shall meet the requirements of Table 1.
Table 1 -- Sensory requirements
Appendix A
Inspection methods
A.1 Warning
Some of the reagents used in the inspection methods of this Standard are toxic
or corrosive. During operation, it shall take appropriate safety and protective
measures.
A.2 General
The reagents and water used in this Standard, when no other requirements are
specified, refer to the analytical reagents and the Grade 3 water specified in
GB/T 6682-2008. Standard solutions, preparations, and products for the
determination of impurities used in the test, when no other requirements are
specified, shall be prepared in accordance with the provisions of GB/T 602 and
GB/T 603. The solution used, when no solvent is specified, refers to the
aqueous solution.
A.3 Identification test
A.3.1 Instrument and equipment
Microscope: 10 times or more than 10 times (objective lens) ×10 (eyepiece).
A.3.2 Identification method
DROP 1 drop of water on the slide; then ADD a small amount of the sample;
COVER with a cover glass; observe under a microscope. A typical diatom
shape may be observed.
A.4 Determination of arsenic (As)
A.4.1 Preparation of sample solution A
WEIGH 10.00 g±0.01 g of the sample; PLACE it in a 250 mL beaker; ADD 50
mL of hydrochloric acid solution; USE a glass watch glass to cover the beaker;
HEAT at 70 °C for 15 min. COOL; USE a slow qualitative filter paper to filter the
supernatant into a 100 mL volumetric flask. USE three portions of 10 mL of hot
water to wash the filter pulp; USE 15 mL of hot water to wash the filter paper.
USE water to dilute to the mark; SHAKE well. Retain this sample solution A, for
use in A.5, determination of lead.
solution and mix. USE 20 mL of trichloromethane to extract twice respectively;
COLLECT the extracts in a 50 mL beaker; evaporate in a steam bath to dryness
(This must be done in a fume hood); ADD 3 mL of nitric acid to the residue;
continue to evaporate to near dryness. ADD 0.5 mL of nitric acid and 10 mL of
water; HEAT to a solution volume of approximately 3 mL~5 mL. TRANSFER to
a 10 mL volumetric flask; USE water to dilute to the mark; SHAKE well.
A.5.3.3 Preparation of standard solution
PIPETTE 1.00 mL of lead standard solution into a 150 mL beaker; ADD 30 mL
of water; ADD 1 mL of hydrochloric acid. HEAT to boil for a few minutes; COOL;
DILUTE to 100 mL. USE sodium hydroxide solution to adjust the pH of solution
to 1.0~1.5 (USE precision test paper with pH 0.5~5.0 to detect). The
subsequent procedure is the same as that in A.5.3.2 “TRANSFER this solution
to a 250 mL separating funnel…TRANSFER to a 10 mL volumetric flask; USE
water to dilute to the mark; SHAKE well”.
A.5.3.4 Determination
USE an air-acetylene flame; at a wavelength of 283.3 nm, USE water to set to
zero; determine the absorbance of sample solution B. The absorbance of
sample solution B shall not exceed that of the standard solution.
A.6 Determination of loss on drying
A.6.1 Instrument and equipment
A.6.1.1 Weighing bottle: φ40 mm×25 mm.
A.6.1.2 Electrothermal constant-temperature drying oven: The temperature
may be controlled at 105 °C±2 °C.
A.6.2 Analytical procedures
WEIGH approximately 2 g of sample, accurate to 0.0002 g; PLACE it in a
weighing bottle which has been previously dried at 105 °C±2 °C to a constant
mass. DRY in an electrothermal constant-temperature drying oven at
105 °C±2 °C for 2 h; TAKE out; COOL to room temperature and weigh. This is
sample A, for use in A.7 determination of loss on ignition and A.8 determination
of non-silicon substance.
A.6.3 Result calculation
The mass fraction w1 of loss on drying is calculated according to the formula
(A.1):
Get QUOTATION in 1-minute: Click GB 14936-2012
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GB 14936-2012: National Food Safety Standard -- Food Additives -- Diatomaceous Earth
GB 14936-2012
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
National Food Safety Standard -
Food Additives - Diatomaceous Earth
食品添加剂 硅藻土
ISSUED ON: DECEMBER 25, 2012
IMPLEMENTED ON: JANUARY 25, 2013
Issued by: Ministry of Health of the PRC
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Technical requirements ... 4
Appendix A Inspection methods ... 5
National Food Safety Standard -
Food Additives - Diatomaceous Earth
1 Scope
This Standard is applicable to the food additives diatomaceous earth of
diatomaceous earth dry products, pickling products, roasting products, fluxing
roasting products prepared by processes such as drying, roasting, pickling,
classification and with natural diatomaceous earth as raw materials.
2 Technical requirements
2.1 Sensory requirements: It shall meet the requirements of Table 1.
Table 1 -- Sensory requirements
Appendix A
Inspection methods
A.1 Warning
Some of the reagents used in the inspection methods of this Standard are toxic
or corrosive. During operation, it shall take appropriate safety and protective
measures.
A.2 General
The reagents and water used in this Standard, when no other requirements are
specified, refer to the analytical reagents and the Grade 3 water specified in
GB/T 6682-2008. Standard solutions, preparations, and products for the
determination of impurities used in the test, when no other requirements are
specified, shall be prepared in accordance with the provisions of GB/T 602 and
GB/T 603. The solution used, when no solvent is specified, refers to the
aqueous solution.
A.3 Identification test
A.3.1 Instrument and equipment
Microscope: 10 times or more than 10 times (objective lens) ×10 (eyepiece).
A.3.2 Identification method
DROP 1 drop of water on the slide; then ADD a small amount of the sample;
COVER with a cover glass; observe under a microscope. A typical diatom
shape may be observed.
A.4 Determination of arsenic (As)
A.4.1 Preparation of sample solution A
WEIGH 10.00 g±0.01 g of the sample; PLACE it in a 250 mL beaker; ADD 50
mL of hydrochloric acid solution; USE a glass watch glass to cover the beaker;
HEAT at 70 °C for 15 min. COOL; USE a slow qualitative filter paper to filter the
supernatant into a 100 mL volumetric flask. USE three portions of 10 mL of hot
water to wash the filter pulp; USE 15 mL of hot water to wash the filter paper.
USE water to dilute to the mark; SHAKE well. Retain this sample solution A, for
use in A.5, determination of lead.
solution and mix. USE 20 mL of trichloromethane to extract twice respectively;
COLLECT the extracts in a 50 mL beaker; evaporate in a steam bath to dryness
(This must be done in a fume hood); ADD 3 mL of nitric acid to the residue;
continue to evaporate to near dryness. ADD 0.5 mL of nitric acid and 10 mL of
water; HEAT to a solution volume of approximately 3 mL~5 mL. TRANSFER to
a 10 mL volumetric flask; USE water to dilute to the mark; SHAKE well.
A.5.3.3 Preparation of standard solution
PIPETTE 1.00 mL of lead standard solution into a 150 mL beaker; ADD 30 mL
of water; ADD 1 mL of hydrochloric acid. HEAT to boil for a few minutes; COOL;
DILUTE to 100 mL. USE sodium hydroxide solution to adjust the pH of solution
to 1.0~1.5 (USE precision test paper with pH 0.5~5.0 to detect). The
subsequent procedure is the same as that in A.5.3.2 “TRANSFER this solution
to a 250 mL separating funnel…TRANSFER to a 10 mL volumetric flask; USE
water to dilute to the mark; SHAKE well”.
A.5.3.4 Determination
USE an air-acetylene flame; at a wavelength of 283.3 nm, USE water to set to
zero; determine the absorbance of sample solution B. The absorbance of
sample solution B shall not exceed that of the standard solution.
A.6 Determination of loss on drying
A.6.1 Instrument and equipment
A.6.1.1 Weighing bottle: φ40 mm×25 mm.
A.6.1.2 Electrothermal constant-temperature drying oven: The temperature
may be controlled at 105 °C±2 °C.
A.6.2 Analytical procedures
WEIGH approximately 2 g of sample, accurate to 0.0002 g; PLACE it in a
weighing bottle which has been previously dried at 105 °C±2 °C to a constant
mass. DRY in an electrothermal constant-temperature drying oven at
105 °C±2 °C for 2 h; TAKE out; COOL to room temperature and weigh. This is
sample A, for use in A.7 determination of loss on ignition and A.8 determination
of non-silicon substance.
A.6.3 Result calculation
The mass fraction w1 of loss on drying is calculated according to the formula
(A.1):
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