GB/T 21817-2008 English PDF

US$154.00 · In stock
Delivery: <= 3 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 21817-2008: Chemicals -- Inherent biodegradability -- Modified SCAS test
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 21817-2008	154	Add to Cart	3 days	Chemicals -- Inherent biodegradability -- Modified SCAS test	Valid

Similar standards

GB/T 21617   GB 23350   GB/T 21622   GB/T 21809   GB/T 21810   GB/T 21807   

Basic data

Standard ID: GB/T 21817-2008 (GB/T21817-2008)
Description (Translated English): Chemicals -- Inherent biodegradability -- Modified SCAS test
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: A80
Classification of International Standard: 13.300; 13.020.40
Word Count Estimation: 8,891
Date of Issue: 2008-05-12
Date of Implementation: 2008-09-01
Adopted Standard: OECD No.302A-1981, 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 improved semi- continuous activated sludge test method overview, test preparation, test procedures, quality assurance and quality control, data and reports. This standard applies to test water soluble, the test concentration test concentration of microorganisms without inhibition, and then test the surface of the glass container without significant adsorption, not because of the loss of organic foaming solution inherent biodegradability.

GB/T 21817-2008: Chemicals -- Inherent biodegradability -- Modified SCAS 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. Modified SCAS test ICS 13.300; 13.020.40 A80 National Standards of People's Republic of China Chemicals inherent biodegradability Improved semi-continuous activated sludge 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. 302A (1981 Nian) "inherent biodegradability . The modified semi-continuous activated sludge 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, Sun Jin industry, reflect a new high, Shi Lili, Liu Jining, Zhang Yanan Yang Jing. Chemicals inherent biodegradability Improved semi-continuous activated sludge test

1 Scope

This standard specifies the chemical inherent biodegradability improved semi-continuous activated sludge test methods outlined, test preparation, test drive Order, quality assurance and quality control, data and reports. Under this standard applies to test water-soluble (DOC concentration in water of not less than 20mg/L), a non-volatile, micro test concentration No biological inhibition, the test surfaces of glass containers no adsorption, not because of inherent biodegradable foaming solution and loss of organic matter Equations.

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 Solution, organic carbon content, usually after filtration through 0.45μm membrane liquid organic carbon content, or by speed 4000r/min 15min supernatant after centrifugation of the organic carbon content.

3 test substance information

a) organic carbon content; b) solubility in water; c) microbial toxicity; d) the main component of the composition ratio.

4 Summary of Method

4.1 Objective Improved semi-continuous activated sludge test by the American Society of soap and detergent (SDA) semi-continuous activated sludge (referred to SCAS, which is mainly used to evaluate alkylbenzenesulfonates primary biodegradability) adapted from, which is characterized by chemical substances in longer Each room (probably a few months) and a higher concentration of microorganisms in contact, in the meantime, to which was added a day to stand treated wastewater to maintain the micro Biological vitality. Because of the long residence time (36h), and intermittently added nutrients, so this test does not simulate the actual operation of the sewage treatment plant Article Member. The test results were obtained with test substance indicate that it has high biodegradation potential, and therefore, this method is most useful for inherent biodegradability Solutions of test methods. Since the conditions of this trial provides very beneficial to select and/or domesticated microbes capable of degrading the test substance, so this method also works for other It provides the required test domesticated species. 4.2 Principle The activated sludge from the sewage treatment plant is placed in the aeration device, and the test substance was added after precipitation of sewage and mix thoroughly after exposure ......

Image     

Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 21817-2008_English be delivered?

Answer: Upon your order, we will start to translate GB/T 21817-2008_English as soon as possible, and keep you informed of the progress. The lead time is typically 1 ~ 3 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB/T 21817-2008_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 21817-2008_English will be deemed to be sold to your employer/organization who actually pays 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+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.