GB/T 14571.4-2022 PDF English
US$185.00 · In stock · Download in 9 secondsGB/T 14571.4-2022: Test method of ethylene glycol for industrial use - Part 4: Determination of ultraviolet transmittance - Ultraviolet spectrophotometric method Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See step-by-step procedureStatus: Valid GB/T 14571.4: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 14571.4-2022 | English | 185 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Test method of ethylene glycol for industrial use - Part 4: Determination of ultraviolet transmittance - Ultraviolet spectrophotometric method
| Valid |
| GB/T 14571.4-2008 | English | 145 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Ethylene glycol for industrial use -- Determination of ultraviolet transmittance -- Ultraviolet spectrophotometric method
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 14571.4-2022
GB/T 14571.4-2022: Test method of ethylene glycol for industrial use - Part 4: Determination of ultraviolet transmittance - Ultraviolet spectrophotometric method
---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/GBT14571.4-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 71.080.60
CCS G 16
Replacing GB/T 14571.4-2008
Test method of ethylene glycol for industrial use - Part 4.
Determination of ultraviolet transmittance - Ultraviolet
spectrophotometric method
Issued on. APRIL 15, 2022
Implemented on. NOVEMBER 01, 2022
Issued by. State Administration for Market Regulation;
Standardization Administration of the People's Republic of China.
Table of Contents
Foreword... 3
Introduction... 5
1 Scope... 6
2 Normative references... 6
3 Terms and definitions... 6
4 Method summary... 7
5 Reagents or materials... 7
6 Instruments... 7
7 Sampling... 8
8 Test steps... 8
9 Test data processing... 11
10 Precision... 11
11 Quality control and assurance... 12
12 Report... 12
Annex A (normative) Method for determination of absorbance of reference water... 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".
This document is Part 4 of GB/T 14571 "Test method of ethylene glycol for industrial
use". The following parts of GB/T 14571 have been issued.
-- Part 1.Determination of acidity - Titration method;
-- Part 2.Determination of purity and impurities - Gas chromatography;
-- Part 3.Determination of content of aldehydes;
-- Part 4.Determination of ultraviolet transmittance - Ultraviolet spectrophotometric
method;
-- Part 5.Determination of chloride ion - Ion chromatography.
This document replaces GB/T 14571.4-2008 "Ethylene glycol for industrial use -
Determination of ultraviolet transmittance - Ultraviolet spectrophotometric method".
Compared with GB/T 14571.4-2008, in addition to the structural adjustments and
editorial changes, the main technical changes in this document are as follows.
a) The provisions for directly measuring and reporting the UV transmittance at each
wavelength are added (see Chapter 4, 8.3.1, 9.1 of this Edition);
b) The preparation basis of "holmium oxide standard solution, potassium dichromate
standard solution, sodium iodide standard solution" is changed (see 5.7, 5.8, 5.9
of this Edition; 4.2, 4.4, 4.6 of Edition 2008);
c) The instrument performance requirements for "ultraviolet spectrophotometer" are
changed (see 6.1 of this Edition; 5.1 of Edition 2008);
d) The chapter "Instruments" is changed (see Chapter 6 of this Edition; Chapter 7 of
Edition 2008);
e) The pairing requirements for "quartz absorption cell" are added (see 6.2 of this
Edition);
f) The nitrogen purge flow rate and time are changed (see 8.2.2 of this Edition; 8.2
of Edition 2008);
g) The steps for directly measuring the UV transmittance of the specimen are added
(see 8.3.1 of this Edition);
h) The expression of "test data processing" is changed (see Chapter 9 of this Edition;
Chapter 10 of Edition 2008);
i) The precision is changed (see Chapter 10 of this Edition; Chapter 11 of Edition
2008);
j) "Quality control and assurance" is added (see Chapter 11 of this Edition);
k) "Method for determination of absorbance of reference water" is changed (see
Annex A of this Edition; Annex B of Edition 2008).
Attention is drawn to the possibility that some 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 China Petroleum and Chemical Industry Federation.
This document shall be under the jurisdiction of National Technical Committee on
Chemical of Standardization Administration of China (SAC/TC 63).
The drafting organizations of this document. Sinopec Shanghai Petrochemical Research
Institute.
Main drafters of this document. Xu Jingzao, Zhang Yuhong, Wang Chuan, Peng Zhenlei,
Li Chengwei.
This document was issued in 2008 for the first time. This is the first revision.
1 Scope
This document specifies the method for determination of the UV light transmittance of
ethylene glycol for industrial use in the wavelength range of 200nm~350nm.
This document is applicable to the determination of the UV light transmittance of
ethylene glycol for industrial use.
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 3723, Sampling of chemical products for industrial use - Safety in sampling
GB/T 6680, General rules for sampling liquid chemical products
GB/T 6682, Water for analytical laboratory use - Specification and test methods
GB/T 8170, Rules of rounding off for numerical values and expression and
judgement of limiting values
JJG 178-2007, Verification Regulation of Ultraviolet, Visible, Near-Infrared
Spectrophotometers
3 Terms and definitions
This document does not have terms and definitions that need to be defined.
4 Method summary
Place the specimen in a 10mm quartz absorption cell. Use water as a reference. Directly
determine the UV transmittance at 220nm, 250nm, 275nm and 350nm.
5 Reagents or materials
5.1 Unless otherwise specified, all reagents used are analytically pure.
5.2 Holmium oxide wavelength calibration filter. qualified after calibration.
5.3 Transmittance filter in the ultraviolet region. qualified after calibration.
5.4 Cut-off filter.
5.5 Isooctane. spectrally pure.
5.6 Naphthalene solution (1mg/L). commercially available or dissolve 1mg of
naphthalene in 1000mL of spectroscopically pure isooctane.
5.9 Sodium iodide standard solution (10g/L). prepare according to C.1 in JJG 178-2007.
5.10 Nitrogen. purity ≥ 99.99% (volume fraction); without oil.
5.11 Reference water. grade one water in compliance with GB/T 6682; the absorbance
at 220nm is not greater than 0.01.The absorbance of water shall be tested in accordance
with Annex A.
6 Instruments
6.1 UV spectrophotometer
Double beam. Determination wavelength is 200nm~400nm. The absorbance accuracy
is better than 0.001.The working wavelength of the instrument is divided into two
sections, namely section A (190nm~340nm) and section B (340nm~400nm).
6.2 Quartz absorption cell
A quartz absorption cell with an optical path of 10mm±0.01mm and a quartz absorption
cell with an optical path of 20mm±0.01mm.
6.3 Nitrogen stripping device
Fix the oil-free pressure reducing valve on the nitrogen cylinder or nitrogen pipeline.
Connect with the flow control valve and the closed glass tube (6.6) inserted into the
25mL volumetric flask or Erlenmeyer flask through a pipeline of appropriate material
(such as a polyethylene tube). All parts need to be clean and free from pollution.
Specimen shall avoid contact with plastic products containing plasticizers.
6.4 Reagent bottles
The capacity is at least 500mL. It is equipped with a bottle cap with good sealing.
6.5 Volumetric flasks or Erlenmeyer flasks
Capacity is 25mL.
6.6 Closed glass tube
Glass part of plastic head dropper.
7 Sampling
According to the provisions of GB/T 3723 and GB/T 6680, take samples at a gentle
flow rate. When the distance between the liquid level and the bottle mouth is less than
10mm, stop sampling. Immediately cover to store sample. Avoid violent shaking of
samples. Analyze as soon as possible.
8 Test steps
8.1 Test preparation
8.1.1 Start-up preparation
The instrument starts up and enters the hardware self-inspection. After a period of
stability, set the instrument parameters. A bandwidth of 2.0nm is used.
8.1.2 Instrument verification
8.1.2.3 Stray light
Use sodium iodide standard solution (5.9), or cut-off filter (5.4) to measure the
transmittance of the photometer at 220nm (i.e., stray light), which shall meet the
requirements of 6.1.
8.1.3 Glassware preparation
Use hydrochloric acid-water-methanol solution (1.3.4, volume ratio) or chromic acid
washing solution to thoroughly clean the absorption cell and other glassware.
8.2 Specimen pretreatment
8.3 Specimen analysis
8.3.1 Direct method
Fill the reference water (5.11) into two paired 10mm quartz absorption cells. Place the
absorption cell in the cell holder of the photometer.
8.3.2 Absorbance method
Fill the reference water (5.11) into two paired 10mm quartz absorption cells. Place the
absorption cell in the cell holder of the photometer. Pay attention to the direction of the
absorption cell. Measure the absorbance at the wavelengths of 220nm, 250nm, 275nm
and 350nm.
9 Test data processing
9.1 If it is determined by 8.3.1, directly report the light transmittance of the specimen
at the relevant wavelength.
9.2 If it is determined by 8.3.2, calculate the net absorbance (Aλ) of the specimen at
each wavelength under the 10mm optical path according to formula (1).
9.3 Analysis results
Take the arithmetic mean of the two repeated measurement results. Report the light
transmittance of the specimen at the relevant wavelength.
......
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 14571.4-2022 be delivered?Answer: The full copy PDF of English version of GB/T 14571.4-2022 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 14571.4-2022_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 14571.4-2022_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 14571.4-2022 -- 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. Question 5: Should I purchase the latest version GB/T 14571.4-2022?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 14571.4-2022 even if the enforcement date is in future. Complying with the latest version means that, by default, it also complies with all the earlier versions, technically. How to buy and download a true PDF of English version of GB/T 14571.4-2022?A step-by-step guide to download PDF of GB/T 14571.4-2022_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 14571.4-2022".
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
|