GB/T 21796-2022 English PDF

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GB/T 21796-2022: Chemicals - Activated sludge respiration inhibition test
Status: Valid

GB/T 21796: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 21796-2022	349	Add to Cart	4 days	Chemicals - Activated sludge respiration inhibition test	Valid
GB/T 21796-2008	274	Add to Cart	3 days	Testing of chemicals -- Activated sludge, respiration inhibition test	Obsolete

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Basic data

Standard ID: GB/T 21796-2022 (GB/T21796-2022)
Description (Translated English): Chemicals - Activated sludge respiration inhibition test
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: A80
Word Count Estimation: 17,139
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 21796-2008: Testing of chemicals -- Activated sludge, respiration inhibition 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.
Testing of chemicals. Activated sludge, respiration inhibition test ICS 13.300; 13.020.40 A80 National Standards of People's Republic of China Chemicals Activated sludge respiration inhibition 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. 209 (1984), "activated sludge respiratory depression System Test "(in English). This standard made the following editorial changes. --- The units of measurement to our legal units of measurement. 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. Ministry of Environmental Protection, Nanjing Institute of Environmental Sciences, Chinese Academy of Inspection and Quarantine, Guangdong Province microbial graduate School. The main drafters of this standard. the new Liu Chun, Lu Ling, Shen Ying baby, Liu Jining, Zhou Junying, Falls Apart, Mei Chengfang. Chemicals Activated sludge respiration inhibition test

1 Scope

This standard specifies the chemical Activated Sludge Respiration Inhibition Test method overview, test preparation, test procedures, quality assurance and quality control System, data and reporting. This standard applies to most of the water-soluble, low volatility, easy to stay in the material body of water; do not apply to phosphoric acid may occur in the role of oxygen The decomposition of the material. For a limited water-soluble test substance, may not be measured half-effect concentration. This standard provides a rapid screening method to identify substances which may adversely affect aerobic microbial sewage treatment plant, and for the Biodegradability tests provide no inhibition test concentration.

2 Terms and definitions

The following terms and definitions apply to this standard. 2.1 Oxygen sludge unit time or the amount of oxygen consumed by aerobic microorganisms in wastewater, usually consumed per liter per hour or sewage sludge cents Expressed as grams [mg/(L · h)]. 2.2 Compared with the control group, caused by microbial respiration rate decreased by 50% of the test concentration.

3 test substance information

a) structural formula; b) purity; c) solubility in water; d) vapor pressure.

4 Summary of Method

4.1 Principle Was added in an amount of activated sludge sewage synthesis, or touching 30min 3h, measuring aerobic microbial respiration rate. In the same article Under parts, respiration rate was measured after the test system by adding various concentrations of the test substance the same activated sludge. Two control groups were accounted for using the Respiratory Rate Percentage value indicates the inhibitory effect of a particular concentration of the test substance. Measurement results of different concentrations calculated from EC50 values. 4.2 reference material The standard recommended 3,5-dichloro-phenol as a reference material. 4.3 Considerations Activated sludge may contain potentially pathogenic organisms and should be handled with care.

5 Test preparation

5.1 instruments and equipment a) measuring device, shown in Figure 1 (including magnetic stirrer, flat-bottomed flask); b) aeration device; ......

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