GB/T 34500.2-2017 English PDF

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GB/T 34500.2-2017: Chemical analysis methods for rare earth residue and wastewater -- Part 2: Determination of chemical oxygen demand (COD)
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Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 34500.2-2017	279	Add to Cart	3 days	Chemical analysis methods for rare earth residue and wastewater -- Part 2: Determination of chemical oxygen demand (COD)	Valid

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Basic data

Standard ID: GB/T 34500.2-2017 (GB/T34500.2-2017)
Description (Translated English): Chemical analysis methods for rare earth residue and wastewater -- Part 2: Determination of chemical oxygen demand (COD)
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: H14
Classification of International Standard: 77.120.99
Word Count Estimation: 14,191
Date of Issue: 2017-10-14
Date of Implementation: 2018-05-01
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

GB/T 34500.2-2017: Chemical analysis methods for rare earth residue and wastewater -- Part 2: Determination of chemical oxygen demand (COD)

---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.
Chemical analysis methods for rare earth residue and waste water - Part 2. Determination of chemical oxygen demand (COD) ICS 77.120.99 H14 National Standards of People's Republic of China Rare earth waste, waste water chemical analysis methods Part 2. Determination of chemical oxygen demand (COD) Part 2.Determination of chemicaloxygendemand (COD) 2017-10-14 Published 2018-05-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China China National Standardization Administration released

Foreword

GB/T 34500 "rare earth waste, chemical analysis of waste water" is divided into 5 parts. --- Part 1. Determination of the amount of fluoride ion selective electrode method; --- Part 2. Determination of chemical oxygen demand (COD); --- Part 3. Determination of weak radioactivity (total activity of α and β); --- Part 4. Determination of copper, zinc, lead, chromium, cadmium, barium, cobalt, manganese, nickel, titanium content; Inductively coupled plasma atomic emission spectrometry; --- Part 5. Determination of ammonia nitrogen content. This section GB/T 34500 Part 2. This section drafted in accordance with GB/T 1.1-2009 given rules. This part of the National Rare Earth Standardization Technical Committee (SAC/TC229) and focal point. This part of the drafting unit.Qin East Rare Earth Group Co., Ltd. (Ganzhou Ai Rui Detection Technology Co., Ltd.), Baotou Rare Earth Research Institute, Ganzhou Institute of Nonferrous Metallurgy, China North Rare Earth (Group) High-Tech Co., Ltd., Ganzhou Chenguang Rare Earth New Materials Co., Ltd., Yiyang Hongyuan Rare Earth Co., Ltd., Tungsten and Rare Earth Products Quality Supervision and Inspection Center, Baotou Rare Earth Hi-Tech Co., Ltd., China Academy of Ecology and Environment Research Center. The main drafters of this section. Yao Nanhong, Liu Chun, Duan Guilan, Wen Bin, Wang Dan, Zhu Ni, Liu Danna, Zhang Wenxing, Zhang Meng, Guo Yu, Xu Ning, Dong Tao, Xiao Hongmei, Song Xudong, Li Jing. Rare earth waste, waste water chemical analysis methods Part 2. Determination of chemical oxygen demand (COD)

1 Scope

GB/T 34500 provisions of this part of the mining, mineral processing, smelting rare earth waste leachate and wastewater COD (Chemical Oxygen Demand) The determination method. This section applies to mining, mineral processing, smelting rare earth residue leaching solution and the determination of chemical oxygen demand (COD). Headquarters Subcategories include two methods of analysis Method 1 Potassium dichromate titration, Method 2 Chlorine calibration method. Method 1, Method 2 Determination of the range in Table 1. Table 1 method Interfering ions Chloride concentration limit / (mg/L) Fluoride-defined concentration / (mg/L) Ammonium limit concentration / (mg/L) COD measurement range / (mg/L) method 1 < 12000 < 15000 - 30.00 ~ 1000.0 12000 ~.20000 < 15000 - 50.00 ~ 1000.0 Method 2 900 ~ 35000 - < 1500 30.00 ~ 1000.0

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version applies to this article Pieces. For undated references, the latest edition (including all amendments) applies to this document. Water quality - Determination of chloride - Silver nitrate titration Solid waste extraction toxicity Toxicity method HNO3 method HJ828 Water quality - Determination of chemical oxygen demand dichromate method 3 Method 1 potassium dichromate titration When method 1 and method 2 overlap in the measurement range, method 1 is arbitration method. 3.1 method principle In strong acid solution, with a certain amount of potassium dichromate oxidation of water samples of reducing substances, with silver nitrate and bismuth nitrate masking agent to eliminate Chloride interference, excessive potassium dichromate to try ferrous spirit as an indicator, ammonium ferrous sulfate standard titration titration solution, according to ammonium ferrous sulfate Standard titration solution to calculate the amount of chemical oxygen demand in water samples. 3.2 Reagents and materials 3.2.1 ferrous ammonium sulfate. ......

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