GB/T 45275-2025 PDF English
US$260.00 · In stock · Download in 9 secondsGB/T 45275-2025: Determination of N, N-dimethylformamide in toys and children's products - Gas chromatography-mass spectrometry Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 45275-2025 | English | 260 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Determination of N, N-dimethylformamide in toys and children's products - Gas chromatography-mass spectrometry
| Valid |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 45275-2025
GB/T 45275-2025: Determination of N, N-dimethylformamide in toys and children's products - Gas chromatography-mass spectrometry
---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT45275-2025
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 97.200.50
CCS Y 57
Determination of N, N-dimethylformamide in toys and
children’s products -- Gas chromatography-mass
spectrometry
Issued on: FEBRUARY 28, 2025
Implemented on: MARCH 01, 2026
Issued by. State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 4
4 Principle... 4
5 Reagents and materials... 4
6 Instruments... 5
7 Test methods... 5
8 Result calculation... 8
9 Limit of quantitation... 8
10 Precision... 8
11 Test report... 8
Annex A (normative) Data of the target substance N, N-dimethylformamide determined
in this document... 10
Annex B (informative) Chromatogram and mass spectrum of N, N-dimethylformamide
... 11
Annex C (informative) Precision... 12
Bibliography... 13
Foreword
This document was drafted in accordance with the rules given in GB/T 1.1-2020
"Directives for standardization - Part 1.Rules for the structure and drafting of
standardizing documents".
Attention is drawn to the possibility that some of the elements of this document may be
the subject of patent rights. The issuing authority shall not be held responsible for
identifying any or all such patent rights.
This document was proposed by National Infant and Child Products Standardization
Working Group (SAC/SWG 18).
This document shall be under the jurisdiction of National Technical Committee on Toys
of Standardization Administration of China (SAC/TC 253) and National Infant and
Child Products Standardization Working Group (SAC/SWG 18).
The drafting organizations of this document. Guangzhou Customs Technical Center,
Huangpu Customs Technical Center, China Consumer Product Quality and Safety
Promotion Association, Shenzhen University of Technology, Zhejiang Qunying Vehicle
Industry Co., Ltd., Luohe Rover Stationery Manufacturing Co., Ltd., Hangzhou Nomo
Testing Technology Co., Ltd., Guangdong Research Institute of New Biomaterials and
High-end Medical Devices, Yike Testing and Certification Co., Ltd., Nanjing Customs
Light Industrial Products and Children's Products Testing Center, Aofei Entertainment
Co., Ltd., Mingmen (China) Children's Products Co., Ltd., Shenzhen Metrology and
Quality Inspection Institute, Shantou Customs Technical Center, Shanghai Customs
Mechanical and Electrical Products Testing Technology Center, SGS-CSTC Standards
Technical Services (Shanghai) Co., Ltd.
Main drafters of this document. Wu Shanshan, Lin Shaopeng, Guo Zongning, Fang Han,
Du Hongzhong, Li Shidong, Huang Lina, Chu Junlong, Yan Jinghui, Lin Xianzhen,
Huang Kanghui, Ji Changxin, Hong Jinqing, Lu Xuanben, Chen Zhigeng, Chen Qinxue,
Lin Xiaowei, Huang Xuehong, Fu Rao, Zhang Xiaoning.
Determination of N, N-dimethylformamide in toys and
children’s products -- Gas chromatography-mass
spectrometry
1 Scope
This document describes the determination of N, N-dimethylformamide in toys and
children's product materials by gas chromatography-mass spectrometry.
This document is applicable to the determination of N, N-dimethylformamide content
in toys and children's product materials.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
GB/T 22048-2022, Determination of certain phthalate esters in toys and children
products
3 Terms and definitions
There are no terms or definitions that require definition in this document.
4 Principle
Ethyl acetate is used as the extracting solution. Ultrasonic extraction is used to extract
N, N-dimethylformamide from toys and children's products. The extract is filtered and
then determined by gas chromatography-mass spectrometry. External standard method
is used for quantification.
5 Reagents and materials
5.1 Ethyl acetate (CAS No. 141-78-6). chromatographically pure.
5.2 N, N-Dimethylformamide standard substance (CAS No. 68-12-2). purity ≥99%, or
with certified standard certificate, as per Annex A.
5.3 N, N-dimethylformamide standard stock solution. Accurately weigh an appropriate
amount of N, N-dimethylformamide standard substance (accurate to 0.1 mg). Use ethyl
acetate (5.1) to prepare a standard stock solution with a mass concentration of 100 mg/L.
NOTE. The standard stock solution shall be stored at 0℃~8℃ away from light. The validity period
is 1 month.
5.4 N, N-dimethylformamide intermediate standard solution. Accurately pipette an
appropriate amount of N, N-dimethylformamide standard stock solution (5.3). Use
ethyl acetate (5.1) to prepare an intermediate standard solution with a mass
concentration of 20 mg/L.
NOTE. The intermediate standard solution shall be stored at 0℃~8℃ away from light. The validity
period is 1 month.
5.5 N, N-dimethylformamide standard working solution. Take appropriate amount of
N, N-dimethylformamide intermediate standard solution (5.4). Dilute with ethyl acetate
(5.1) to prepare a series of standard working solutions with mass concentrations of 0.5
mg/L, 1 mg/L, 2 mg/L, 5 mg/L, and 10 mg/L respectively.
NOTE. The standard stock solution shall be stored at 0℃~8℃ away from light. The validity period
is 1 month.
6 Instruments
6.1 Analytical balance. read to 0.1 mg.
6.2 Stoppered extraction bottle. 50 mL.
6.3 Ultrasonic extractor. with temperature control device; upper temperature limit
≥60℃; the performance of ultrasonic extractor shall be in accordance with 6.13 of GB/T
22048-2022.
6.4 Organic filter membrane. pore size is 0.22 μm.
6.5 Gas chromatography-mass spectrometry (GC-MS). equipped with EI source.
7 Test methods
7.1 Sample preparation and extraction
Obtain the single material from the sample by mechanical means. Use suitable tools to
shape the sample into a size not exceeding 5 mm.
Use an analytical balance (6.1) to weigh 1 g (accurate to 0.1 mg) of sample. Place it in
a stoppered extraction bottle (6.2). Add 20.0 mL of ethyl acetate solvent (5.1) and
tighten the bottle cap. Place the sample in an ultrasonic extractor (6.3) in a 60°C water
bath and ultrasonicate for 30 min. After cooling, filter the extract through an organic
filter membrane (6.4). Use a gas chromatograph-mass spectrometer (6.5) to measure
the extract).
7.2 Blank test
Except for not weighing the specimen, the remaining steps are the same as 7.1 to carry
out a blank test.
7.3 Instrument analysis conditions
Since the test results depend on the instrument used, it is not possible to give universal
parameters for chromatographic analysis. The parameters shall be set to ensure that the
component being measured can be separated from other components to a limited extent
during the determination. The following operating conditions have been proven to be
suitable for the test.
a) Capillary column. polar polyethylene glycol stationary phase, 30 m×0.25
mm×0.25 μm;
b) Injection volume. 1 μL;
c) Injection port temperature. 230℃;
d) Chromatographic mass spectrometer interface temperature. 250℃;
e) Transfer line temperature. 250℃;
f) Column temperature. 50℃ for 2 min; 20℃/min to 200℃, for 2 min;
g) Injection system. non-divided flow;
h) Carrier gas. helium;
i) Carrier gas flow rate. 1.2 mL/min;
j) Ionization mode. EI ionization;
k) Ionization energy. 70 eV;
l) Ion source temperature. 230℃;
m) Solvent delay. 2 min;
n) Scan mode. full scan mode and selected ion monitoring; mass scanning range is
30 amu~100 amu; quantification ion is 73; qualification ions are 44, 42, 72, 74.
7.4 Drawing of standard working curve
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
Tips & Frequently Asked QuestionsQuestion 1: How long will the true-PDF of English version of GB/T 45275-2025 be delivered?Answer: The full copy PDF of English version of GB/T 45275-2025 can be downloaded in 9 seconds, and it will also be emailed to you in 9 seconds (double mechanisms to ensure the delivery reliably), with PDF-invoice. Question 2: Can I share the purchased PDF of GB/T 45275-2025_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 45275-2025_English will be deemed to be sold to your employer/organization who actually paid for it, including your colleagues and your employer's intranet. Question 3: Does the price include tax/VAT?Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countriesQuestion 4: Do you accept my currency other than USD?Answer: Yes. www.ChineseStandard.us -- GB/T 45275-2025 -- Click this link and select your country/currency to pay, the exact amount in your currency will be printed on the invoice. Full PDF will also be downloaded/emailed in 9 seconds. How to buy and download a true PDF of English version of GB/T 45275-2025?A step-by-step guide to download PDF of GB/T 45275-2025_EnglishStep 1: Visit website https://www.ChineseStandard.net (Pay in USD), or https://www.ChineseStandard.us (Pay in any currencies such as Euro, KRW, JPY, AUD).
Step 2: Search keyword "GB/T 45275-2025".
Step 3: Click "Add to Cart". If multiple PDFs are required, repeat steps 2 and 3 to add up to 12 PDFs to cart.
Step 4: Select payment option (Via payment agents Stripe or PayPal).
Step 5: Customize Tax Invoice -- Fill up your email etc.
Step 6: Click "Checkout".
Step 7: Make payment by credit card, PayPal, Google Pay etc. After the payment is completed and in 9 seconds, you will receive 2 emails attached with the purchased PDFs and PDF-invoice, respectively.
Step 8: Optional -- Go to download PDF.
Step 9: Optional -- Click Open/Download PDF to download PDFs and invoice.
See screenshots for above steps: Steps 1~3 Steps 4~6 Step 7 Step 8 Step 9
|