Path:
Home >
GB/T >
Page658 > GB/T 21816-2008
Price & Delivery
US$174.00 · In stock · Download in 9 secondsGB/T 21816-2008: Chemicals -- Inherent biodegradability -- Zahn-Wellens test
Delivery: 9 seconds. True-PDF full-copy in English & invoice will be downloaded + auto-delivered via email. See
step-by-step procedureStatus: Valid
| Std ID | Version | USD | Buy | Deliver [PDF] in | Title (Description) |
| GB/T 21816-2008 | English | 174 |
Add to Cart
|
3 days [Need to translate]
|
Chemicals -- Inherent biodegradability -- Zahn-Wellens test
|
Click to Preview a similar PDF
Basic data
| Standard ID | GB/T 21816-2008 (GB/T21816-2008) |
| Description (Translated English) | Chemicals -- Inherent biodegradability -- Zahn-Wellens test |
| Sector / Industry | National Standard (Recommended) |
| Classification of Chinese Standard | A80 |
| Classification of International Standard | 13.300; 13.020.40 |
| Word Count Estimation | 9,923 |
| Date of Issue | 2008-05-12 |
| Date of Implementation | 2008-09-01 |
| Adopted Standard | OECD No.302B-1992, IDT |
| Regulation (derived from) | Announcement of Newly Approved National Standards No. 7, 2008 (No. 120 overall) |
| Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China |
| Summary | This standard specifies the inherent biodegradability of chemicals Zane Test methods outlined Florence Hui, test preparation, test procedures, quality assurance and quality control, data and reports. This standard applies to the determination of water-soluble, non- volatile, no strong adsorption, and not because of the loss of foam solution, the test concentrations no inhibition of microbial chemicals inherent biodegradability. |
GB/T 21816-2008: Chemicals -- Inherent biodegradability -- Zahn-Wellens test
---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Chemicals. Inherent biodegradability. Zahn-Wellens test
ICS 13.300; 13.020.40
A80
National Standards of People's Republic of China
Chemicals inherent biodegradability
Zahn - Wellens test
Posted 2008-05-12
2008-09-01 implementation
Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
Standardization Administration of China released
Foreword
This standard is identical with the Organisation for Economic Co-operation and Development (OECD) guidelines for testing of chemicals No. 302B (1992 Nian) "Zahn - Wellens test
Test "(in English).
This standard made the following editorial changes.
--- The units of measurement to our legal units of measurement.
Appendix A of this standard is an informative annex.
This standard is managed by the National Standardization Technical Committee chemicals dangerous (SAC/TC251) and focal points.
This standard is drafted by. Environmental Protection Department of Chemical Registration Center.
Participated in the drafting of this standard. Nanjing Institute of Environmental Sciences Department of Environmental Protection, Shenyang Research Institute of Chemical Safety Evaluation Center of Shanghai inspection
Testing center.
The main drafters of this standard. the new Liu Chun, Lu Ling, Nie Jinglei, Liu Jining, Shi Lili, Song Mei Hou, Zhao Huaqing.
Chemicals inherent biodegradability
Zahn - Wellens test
1 Scope
Chemicals inherent biodegradability Zane This standard specifies - Wellens test method overview, test preparation, test procedures, quality assurance
And quality control, data and reports.
This standard applies to the determination of water soluble (water concentration of not less than 50mg/L, with DOC dollars), non-volatile, no strong adsorption
And not because of the loss of foaming solution, the concentration of the test for inherent biological microorganisms without inhibiting chemical degradation.
2 Terms and definitions
The following terms and definitions apply to this standard.
2.1
Under optimum conditions, the test substance for a long time in contact with the exhibit inoculum potential for biodegradation.
2.2
Test substance causes chemical changes in the structure characteristic of the process of loss under biological effect.
2.3
The total amount of test medium (including solutions and suspensions) organic carbon.
2.4
Solution, organic carbon content, usually through the 0.45μm membrane filter liquid organic carbon content, or by 4000r/min transfer
Supernatant after centrifugation 15min organic carbon content.
2.5
In strong acid and heating conditions, a certain amount of dichromate oxidation of reducing substances in water samples of the amount of oxidant consumed, can be expressed as millimoles per
Oxygen milligrams (mg/mg) g of the test substance consumed.
3 test substance information
a) organic carbon content;
b) solubility in water;
c) vapor pressure;
d) foaming;
e) microbial toxicity;
f) adsorption;
g) formula.
...
