GB/T 15456-2019 English PDF

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GB/T 15456-2019: Determination of the chemical oxygen demand in industrial circulating cooling water - Permanganate index method
Status: Valid

GB/T 15456: Historical versions

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 15456-2019	119	Add to Cart	3 days	Determination of the chemical oxygen demand in industrial circulating cooling water - Permanganate index method	Valid
GB/T 15456-2008	199	Add to Cart	2 days	Industrial circulating cooling water -- Determination of the chemical oxygen demand -- Potassium permanganate method	Obsolete
GB/T 15456-1995	199	Add to Cart	2 days	Industrial circulating cooling water Determination of the chemical oxygen demand Potassium permanganate method	Obsolete

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Basic data

Standard ID: GB/T 15456-2019 (GB/T15456-2019)
Description (Translated English): Determination of the chemical oxygen demand in industrial circulating cooling water - Permanganate index method
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: G76
Classification of International Standard: 71.040.40
Word Count Estimation: 6,631
Date of Issue: 2019-08-30
Date of Implementation: 2020-07-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 15456-2019: Determination of the chemical oxygen demand in industrial circulating cooling water - Permanganate index method

---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.
Determination of the chemical oxygen demand in industrial circulating cooling water - Permanganate index method ICS 71.040.40 G76 National Standards of People's Republic of China Replace GB/T 15456-2008 Determination of Chemical Oxygen Demand (COD) in Industrial Circulating Cooling Water Permanganate index method (ISO 8467.1993, Waterquality-Determination of permanganateindex, NEQ) Published on.2019-08-30 2020-07-01 implementation State market supervision and administration China National Standardization Administration issued

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard replaces GB/T 15456-2008 "Determination of Chemical Oxygen Demand (COD) in Industrial Circulating Cooling Water by Potassium Permanganate Method," Compared with GB/T 15456-2008, the main technical changes except editorial changes are as follows. --- Revised the scope of application of the standard (see Chapter 1, Chapter 1 of the.2008 edition); --- Revised the expression of the method summary (see 3.1, Chapter 3 of the.2008 edition); --- Replace the silver sulfate saturated solution with silver nitrate solution and modify the test procedure (see Chapter 3.3 of the.2008 edition); --- Increased potentiometric titration (see Chapter 4). This standard is prepared using the redrafting method with reference to ISO 8467.1993 "Determination of water quality permanganate index", and ISO 8467.1993 The degree of consistency is non-equivalent. This standard was proposed by the China Petroleum and Chemical Industry Federation. This standard is under the jurisdiction of the National Chemical Standardization Technical Committee (SAC/TC63). This standard was drafted. Jiyuan Qingyuan Water Treatment Co., Ltd., Jiangsu Special Equipment Safety Supervision and Inspection Institute Changzhou Branch, Guang State Special Pressure Equipment Testing and Research Institute, Shenzhen Junnuo Testing Co., Ltd., Xiamen Huajian Testing Technology Co., Ltd., CNOOC Tianjin Chemical Research and Design Institute Co., Ltd., Metrohm China Ltd., Shanghai Light Industry Research Institute Co., Ltd., Guangdong Petroleum and Fine Chemical Research Research Institute, METTLER TOLEDO Instrument (Shanghai) Co., Ltd., Zhejiang Shuizhiyin Environmental Protection Technology Co., Ltd. The main drafters of this standard. He Yuxi, Wu Xunzhen, Lin Jinmei, Wen Zongxun, Chen Guilin, Wang Wei, Wang Zhongguang, Che Chengdan, Huang Linjia, Fu Dan, Chen Jianxia, Li Junfei, Zhu Chunlian. The previous versions of the standards replaced by this standard are. ---GB/T 15456-1995, GB/T 15456-2008. Determination of Chemical Oxygen Demand (COD) in Industrial Circulating Cooling Water Permanganate index method

1 Scope

This standard specifies the method for determining chemical oxygen demand (COD) using the permanganate index method in industrial circulating cooling water. This standard applies to industrial circulating cooling water chemical oxygen demand (CODMn) content of 0.5mg/L ~ 10mg/L (in O2) Determination. Among them, the volumetric method is applicable to the determination of CODMn of 2mg/L~10mg/L (in O2); potentiometric titration is applicable to CODMn It is a measurement of 0.5 mg/L to 10 mg/L (in terms of O2). When the concentration exceeds the upper limit of the range, it can be diluted and measured. This standard also applies to the determination of chemical oxygen demand (CODMn) in raw water, boiler water and reclaimed water.

2 Normative references

The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article. Pieces. For undated references, the latest edition (including all amendments) applies to this document. Preparation of GB/T 601 chemical reagent standard titration solution Preparation of preparations and products used in GB/T 603 chemical reagent test method GB/T 6682 Analytical laboratory water specifications and test methods

3 volume method

3.1 Method summary After the water sample is acidified, accurately add a known amount of potassium permanganate standard solution, heat it to fully oxidize, and add excess oxalic acid. The sodium standard solution is used to reduce the remaining potassium permanganate, and then the potassium permanganate standard titration solution is used to drop excess sodium oxalate until the redox reaction At the end point, the amount of potassium permanganate consumed is converted into the mass concentration of oxygen consumed. MnO4- 8H 5e= Mn2 4H2O 2MnO4- 5C2O42- 16H =2Mn2 10CO2↑ 8H2O 3.2 Reagents or materials Caution - The strong acid used in this standard is corrosive and should be avoided when inhaled or in contact with the skin. Splash on the body should be used immediately Rinse with water, seek medical attention if it is serious. 3.2.1 Reagents and water used in this standard, unless otherwise specified, should be used with analytically pure reagents and in accordance with GB/T 6682 Class III water. 3.2.2 Standard titration solutions, preparations and products used in the test shall be in accordance with GB/T 601 and GB/T 603 when no other requirements are specified. Provision is made. 3.2.3 Sulfuric acid solution. 1 3. 3.2.4 Silver nitrate solution..200g/L, stored in a brown bottle. 3.2.5 sodium oxalate standard solution. c (1/2Na2C2O4) about 0.01mol/L, the use concentration should be greater than the potassium permanganate standard titration solution. 3.2.6 Potassium permanganate standard titration solution. c (1/5KMnO4) about 0.01mol/L. ......

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