GB/T 23993-2009 PDF English
US$135.00 · In stock · Download in 9 secondsGB/T 23993-2009: Determination of formaldehyde content of waterborne coatings - Spectrophotometric method with acetylacetone 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 23993-2009 | English | 135 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Determination of formaldehyde content of waterborne coatings - Spectrophotometric method with acetylacetone
| Valid |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 23993-2009
GB/T 23993-2009: Determination of formaldehyde content of waterborne coatings - Spectrophotometric method with acetylacetone
---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/GBT23993-2009
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 87.040
G 50
Determination of formaldehyde content of waterborne
coatings - Spectrophotometric method with
acetylacetone
Issued on. JUNE 02, 2009
Implemented on. FEBRUARY 01, 2010
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the PRC;
Standardization Administration of the PRC.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Principle... 4
4 Reagents and materials... 5
5 Instruments and equipment... 6
6 Sampling... 7
7 Test procedure... 7
8 Expression of results... 8
9 Precision... 9
10 Test report... 9
Foreword
This Standard was proposed by China Petroleum and Chemical Industry
Federation.
This Standard shall be under the jurisdiction of National Technical Committee 5
on Paints & Pigments of Standardization Administration of China.
Drafting organization of this Standard. CNOOC Changzhou Paint and Coatings
Industry Research Institute.
Main drafters of this Standard. Peng Jufang, Cui Jianfa, Ji Junhong.
Determination of formaldehyde content of waterborne
coatings - Spectrophotometric method with
acetylacetone
1 Scope
This Standard specifies the method for determination of formaldehyde content
of waterborne coatings.
This Standard applies to the test of waterborne coatings and their raw materials
with a formaldehyde content of not less than 5 mg/kg.
2 Normative references
The following documents contain provisions which, through reference in this
Standard, constitute provisions of this Standard. For the dated references, their
subsequent amendments (excluding corrections) or revisions do not apply to
this Standard. However, the parties who enter into agreement based on this
Standard are encouraged to investigate whether the latest editions of these
documents are applicable. For undated reference documents, the latest
editions apply to this Standard.
GB/T 601 Chemical reagent - Preparations of reference titration solutions
GB/T 3186 Paints, varnishes and raw materials for paints and varnishes -
Sampling (GB/T 3186-2006, ISO 15528.2000, IDT)
GB/T 6682 Water for analytical laboratory use - Specification and test
methods (GB/T 6682-2008, ISO 3696.1987, MOD)
3 Principle
Distill the formaldehyde out of the sample. In the acetic acid-ammonium acetate
buffer solution with pH=6, the formaldehyde in the fraction reacts with
acetylacetone under heating to form a stable yellow complex.
4 Reagents and materials
In the analytical testing, only reagents that have been confirmed to be
analytically pure are used; the water used shall meet the requirements of grade
3 water in GB/T 6682.
4.1 Ammonium acetate;
4.2 Glacial acetic acid. ρ=1.055 g/mL;
4.3 Acetylacetone. ρ=0.975 g/mL;
4.5 Iodine solution. c(1/2I2)=0.1 mol/L;
4.6 Sodium hydroxide solution. 1 mol/L;
4.7 Hydrochloric acid solution. 1 mol/L;
4.8 Sodium thiosulfate standard solution. c(Na2S2O3)=0.1 mol/L. And calibrate
in accordance with GB/T 601;
4.9 Starch solution. 1 g/100 mL. Weigh 1 g of starch; use a small amount of
water to mix it into a paste; pour it into 100 mL of boiling water; make it a
transparent solution. Prepare it just before use;
4.10 Formaldehyde solution. About 37% (mass fraction);
5 Instruments and equipment
5.1 Distillation device. 100 mL distillation flask, serpentine condenser, distillate
receiver;
5.2 Graduation tube with stopper. 50 mL (the same container as the distillate
receiver in 5.1);
6 Sampling
In accordance with the provisions of GB/T 3186, take a representative sample
of the product under test.
7 Test procedure
7.1 Drawing of standard working curve
Take several graduation tubes with stopper (5.2); pipette 0.00 mL, 0.20 mL,
0.50 mL, 1.00 mL, 3.00 mL, 5.00 mL, and 8.00 mL of formaldehyde standard
diluent (4.12) into them, respectively.
7.2 Test of formaldehyde content
Weigh about 2 g (accurate to 1 mg) of the well-stirred specimen; place it in a 50
mL volumetric flask; add water and shake well, and dilute to the mark. Then use
the pipette to transfer the specimen aqueous solution in the 10 mL volumetric
flask; place it in the distillation flask (5.1) which has been pre-filled with 10 mL
of water.
8 Expression of results
8.1 Calculation
Use formula (2) to calculate the formaldehyde content.
8.2 Detection limit of test method. 5 mg/kg.
9 Precision
9.1 Repeatability
Under repeatability conditions, when the test result is not greater than 100
mg/kg, the difference between the two test results of the same operator is not
greater than 10 mg/kg.
9.2 Reproducibility
When the test result is not greater than 100 mg/kg, the difference between the
test results of different laboratories is not greater than 20 mg/kg.
10 Test report
The test report shall include at least the following contents.
......
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 23993-2009 be delivered?Answer: The full copy PDF of English version of GB/T 23993-2009 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 23993-2009_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 23993-2009_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 23993-2009 -- 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 23993-2009?A step-by-step guide to download PDF of GB/T 23993-2009_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 23993-2009".
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
|