GB/T 9721-2006 PDF English
US$90.00 · In stock · Download in 9 secondsGB/T 9721-2006: Chemical reagent - General rules for the molecular absorption spectrophotometry (ultraviolet and visible) 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 9721: Evolution and historical versions
| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 9721-2006 | English | 90 |
Add to Cart
|
0-9 seconds. Auto-delivery
|
Chemical reagent - General rules for the molecular absorption spectrophotometry (ultraviolet and visible)
| Valid |
| GB/T 9721-1988 | English | 279 |
Add to Cart
|
3 days
|
Chemical reagent--General rules for the molecular absorption spectrophotometry (ultraviolet and visible)
| Obsolete |
Excerpted PDFs (Download full copy in 9 seconds upon purchase)PDF Preview: GB/T 9721-2006
GB/T 9721-2006: Chemical reagent - General rules for the molecular absorption spectrophotometry (ultraviolet and visible)
---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/GBT9721-2006
GB
NATIONAL STANDARD
ICS 71.040.40; 71.040.30
G 60
Replacing GB/T 9721-1988
Chemical reagent - General rules for the molecular
absorption spectrophotometry (ultraviolet and visible)
Issued on. SEPTEMBER 01, 2006
Implemented on. APRIL 01, 2007
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of the People's Republic of China;
Standardization Administration of the PRC.
Table of Contents
Foreword... 3
1 Scope... 4
2 Normative references... 4
3 Terms and definitions... 4
4 Principles of method... 6
5 Reagent... 7
6 Instruments... 8
7 Determination... 8
Foreword
This standard replaces GB/T 9721-1988 “Chemical reagent - General rules for
the molecular absorption spectrophotometry (ultraviolet and visible)”. As
compared with GB/T 9721-1988, the main changes are as follows.
- ADD the references (2 of this version);
- ADD the terms and symbols (3.4, 3.16, and 3.18 of this version);
- MODIFY the relevant contents of the “Instruments” part (6.1, 6.2 and 6.3 of
1988 version; 6 of this version);
- SUPPLEMENT the specification for the technical requirements of the
“absorption pool” (7.1.4 of 1988 version; 7.1.4 of this version);
- SUPPLEMENT the application conditions as required by the “absorbance
reading range” (7.1.6 of 1988 version; 7.1.6 of this version);
- ADD the “Determination of molar absorptivity” (7.2.4 of this version) and
the “Determination of mass absorptivity” (7.2.6 of this version);
- ELIMINATE the “precision” (8 of 1988 version).
This standard was proposed by the Chinese Petroleum and Chemical Industry
Association.
This standard shall be under the jurisdiction of the National Chemical
Standardization Technical Committee - Chemical Reagent Branch (SAC/TC
63/SC 3).
The drafting organization of this standard. Beijing Chemical Reagent Research
Institute.
The main drafters of this standard. Guan Ruibao, Qiang Jinglin.
This standard was first published in 1988.
Chemical reagent - General rules for the molecular
absorption spectrophotometry (ultraviolet and visible)
1 Scope
This standard specifies the instrument requirements and determination
methods of chemical reagent molecular absorption spectrophotometry
(ultraviolet and visible).
This standard applies to the determination of the impurity contents in the
chemical reagent of the absorption wavelength between 200 nm ~ 850 nm
AND the qualitative and quantitative analysis of the organic chemical reagents,
indicators, and special reagents.
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 6682-1992 Water for laboratory use; Specifications (eqv ISO
3696.1987)
GB/T 14666 Terms for analytical chemistry
JJG 178-1996 Visible spectrophotometer
JJG 682-1990 Dual-beam ultraviolet visible spectrophotometer
JJG 689-1990 Ultraviolet, visible, near-infrared spectrophotometer
3 Terms and definitions
The terms and definitions as defined in GB/T 14666 AND the following terms
and definitions apply to this standard.
3.1
Absorption peak
It refers to the wavelength of the absorption spectrum at the maximum
absorbance value, in the unit of nm.
3.2
Absorption spectrum
It refers to, when the concentration of the substance to be determined and
the thickness of the absorption pool are constant, the curve of the
absorbance (or any function of the absorbance) corresponding to the
wavelength (or any function of the wavelength).
3.3
Thickness (L)
It refers to the distance between the two parallel and transparent internal
surface planes of the absorption pool, in the unit of mm or cm.
3.4
Amount-of-substance concentration (c)
It refers to the ratio of the amount of substance to the volume of solution, in
the unit of mol/L.
3.5
Molar absorptivity (ε)
It refers to the absorptivity ε with the thickness expressed in cm AND the
concentration expressed in mol/L, in the unit of L/(cm•mol).
4 Principles of method
The valence electrons in the molecule of the solution can selectively absorb
ultraviolet or visible light, AND transit from the ground state to the excited state,
forming an ultraviolet-visible absorption spectrum. Qualitative analysis is
carried out based on the absorption peak and the molar absorptivity in the
UV-visible absorption spectrum.
5 Reagent
5.1 Water
The water used to prepare solution for the instrument calibration shall comply
with the level II water requirements in GB/T 6682-1992.The water used for
sample test shall be of the level II or level III water in GB/T 6682-1992 in
accordance with the requirements of the product standard.
5.2 Organic solvents
SELECT appropriate solvent based on the requirements of the product
standards, and CHECK whether the solvent used for the test complies with the
requirements in the vicinity of the determination wavelength; AND it shall be
5.3 Buffer solution
It shall be prepared in accordance with the requirements of the product
standard; AND the reagents used shall be free from interference absorption in
case of determination at the UV zone.
5.4 Standard sample solution
It shall be prepared together with the sample solution to be determined in
accordance with the requirements of the product standard.
Wavelength range / nm Absorbance A
300 above
6 Instruments
In accordance with the sample determination requirements, it shall select the
single-wavelength single-beam or single-wavelength dual-beam UV visible
spectrophotometer which complies with the requirements of JJG 178-1996,
JJG 682-1990 or JJG 689-1990.
7 Determination
7.1 Selection of determination conditions
7.1.1 Light source
SELECT the light source based on the determined wavelength; USE the
hydrogen lamp (or tritium lamp) when the determined wavelength is 200 nm ~
350 nm, AND the tungsten lamp (or iodine tungsten lamp) when the
determined wavelength is 350 nm ~ 850 nm.
7.1.3 Determined wavelength
In the development of product standards, the determined wavelength is
determined in accordance with the position of the substance to be determined,
which is generally selected from the wavelength range of the maximum
absorbance.
7.4.4 Absorption pool
In accordance with the requirements of use, it may, in accordance with the
provisions of clause 2.2 “Matching of absorption pool” in JJG 178-1996 OR the
provisions of 12 “Specification of standard substance quartz absorption pool” in
JJG 682-1990, select the absorption pool;
7.1.5 Sample solution
It shall be prepared in accordance with the provisions of product standards.
The solution shall be uniform and non-scatter, that is, there shall not be
bubbles and suspended substances that affect the absorption of light.
7.2 Determination method
7.2.1 Absorption curve method
When using the automatic recording instrument, it can automatically scan and
draw the absorption curve.
7.2.2 Working curve method
PREPARE more than 4 standard solutions with the concentrations in
appropriate proportions in accordance with the provisions of the product
standards; USE the blank solution (or solvent) as the reference solution, and
meanwhile USE the absorbance of the blank solution (or solvent) to conduct
calibration.
7.2.5 Sensitivity determination
CONDUCT determination in accordance with the specified conditions of the
product standards. Sensitivity can be expressed by the molar absorptivity.
7.2.6 Determination of mass absorptivity
CONDUCT determination in accordance with the specified conditions of the
product standards.
......
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 9721-2006 be delivered?Answer: The full copy PDF of English version of GB/T 9721-2006 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 9721-2006_English with my colleagues?Answer: Yes. The purchased PDF of GB/T 9721-2006_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 9721-2006 -- 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 9721-2006?Answer: Yes. Unless special scenarios such as technical constraints or academic study, you should always prioritize to purchase the latest version GB/T 9721-2006 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 9721-2006?A step-by-step guide to download PDF of GB/T 9721-2006_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 9721-2006".
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
|