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GB/T 12687.2-2010 English PDF

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GB/T 12687.2-2010: Chemical analysis methods of rare earth nitrate for growth regulator for plant -- Part 2: Determination of chlorine content
Status: Obsolete

GB/T 12687.2: Evolution and historical versions

Standard IDContents [version]USDSTEP2[PDF] delivered inStandard Title (Description)StatusPDF
GB/T 12687.2-2010English359 Add to Cart 3 days [Need to translate] Chemical analysis methods of rare earth nitrate for growth regulator for plant -- Part 2: Determination of chlorine content Obsolete GB/T 12687.2-2010
GB/T 12687.2-1990English199 Add to Cart 2 days [Need to translate] Chemical analysis of nitrate of rare earth for agriculture--Determination of chlorine content--Mercurimetric method Obsolete GB/T 12687.2-1990

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Basic data

Standard ID GB/T 12687.2-2010 (GB/T12687.2-2010)
Description (Translated English) Chemical analysis methods of rare earth nitrate for growth regulator for plant -- Part 2: Determination of chlorine content
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard H14
Classification of International Standard 77.120.99
Word Count Estimation 9,957
Date of Issue 2011-01-14
Date of Implementation 2011-11-01
Older Standard (superseded by this standard) GB/T 12687.2-1990
Regulation (derived from) National Standard Approval Announcement 2011 No.2; National Standard Announcement 2012 No.37
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 rare earth nitrate plant growth regulator Determination of the amount of chlorine agent. This section applies to the determination of rare earth nitrate plant growth regulator agent chlorine content.

GB/T 12687.2-2010: Chemical analysis methods of rare earth nitrate for growth regulator for plant -- Part 2: Determination of chlorine content


---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 of rare earth nitrate for growth regulator for plant Part 2. Determination of chlorine content ICS 77.120.99 H14 National Standards of People's Republic of China Replacing GB/T 12687.2-1990 Rare earth nitrate plant growth regulator chemical analysis Part 2. Determination of chlorine content Part 2. Determinationofchlorinecontent Issued on. 2011-01-14 2011-11-01 implementation Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China Standardization Administration of China released

Foreword

GB/T 12687 "analysis of rare earth nitrate plant growth regulator chemical" is divided into three parts. --- Part 1. arsenic, mercury, lead, cadmium, chromium content - Inductively Coupled Plasma Mass Spectrometry; --- Part 2. Determination of chlorine content; --- Part 3. Determination of the amount of water insoluble gravimetric method. This is Part 2. This Part replaces GB/T 12687.2-1990 "Determination of chlorine content of agricultural chemical analysis of rare earth nitrate Mercurimetric method." This section compared with the GB/T 12678.2-1990, the main changes are as follows. --- Silver nitrate turbidimetric method and potentiometric titration method instead of the amount of mercury; --- Measured by the scope of 0.10 percent to 5.00 percent to 0.0050% - 10.00%; --- Increasing the precision of the terms; --- Increased quality assurance and control provisions. This part of the National Standardization Technical Committee of rare earth (SAC/TC229) centralized. This part by the Beijing Nonferrous Metal Research Institute, China Nonferrous Metals Industry Institute of Standards Metrology and Quality is responsible for drafting. Part 1 was drafted by the Beijing Nonferrous Metal Research Institute. Method 1 of this section by the Ganzhou Qiandong Rare Earth Group Co., Ltd., Yixing Willy into the new Rare Earth Co., Ltd. participated in the drafting. The main drafters of this Part 1. Yang Ping, Chen Yun red. Method 1 of this section participate drafters. Nam Hung Yao, Chen Jie, Xin Ming dragon, Gu Guojun. Method 2 This part was drafted by the Beijing Nonferrous Metal Research Institute. Method 2 of this section by the Ganzhou Qiandong Rare Earth Group Co., Ltd., Baotou Rare Earth Research Institute participated in the drafting. The main drafters of this section Method 2. Tong Jian, Li Yanfen. Method 2 of this section participate drafters. Nam Hung Yao, Chen Jie, Zhang Huizhen, Wang Dongjie. This part of the alternative criteria previously issued as follows. --- GB/T 12687.2-1990. Rare earth nitrate plant growth regulator chemical analysis Part 2. Determination of chlorine content

1 Scope

GB/T 12687 provisions of this part of the rare earth nitrate plant growth regulator agents Determination of chlorine content. This section applies to the determination of rare earth nitrate plant growth regulator agent chlorine content. Method 1 Measurement range. 0.0050% to 0.50%; Method 2 Measurement range. > 0.50% to 10.00%.

1 silver nitrate turbidimetry

2 principle of the method

Sample dilute nitric acid dissolved in dilute nitric acid medium, chloride ions to form silver chloride and silver colloids in the presence of a stabilizer glycerol, Measured at 430nm wavelength spectrophotometer. Richard on the working curve corresponding amount of chlorine.

3 Reagents and materials

3.1 nitric acid (11). 3.2 nitric acid (13). 3.3 silver nitrate (5g/L). Glycerin 3.4 (11). Secondary ion exchanged water to 3.5. before use chlorine ion (of Cl-) test. Amount of water in 20mL colorimetric tube, add 2mL nitrate Silver acid (3.3), shaking gently, incubated at 60 ℃ water bath 10min, without visual turbidity before use. 3.6 Storage chlorine standard solution. Weigh 1.6485g by 400 ℃ ~ 450 ℃ calcined and cooled to room temperature in the dryer sodium chloride (preferably Grade pure) in 500mL beaker, add 200mL water dissolved. Moved into 1000mL volumetric flask and dilute to volume, and mix. This solution 1mL 1mg containing chlorine. 3.7 chlorine standard solution. Pipette 10.00mL chlorine standard stock solution (3.6) in 500mL flask, diluted with water to the mark. This solution 1mL 20.00μg containing chlorine.

4 Instrument

Spectrophotometer.

5 Sample

Weighing the sample immediately after the opening. Step 6 Analysis 6.1 Sample Table 1. Weigh the sample (5), accurate to 0.0001g. Table 1 Chlorine content /% Sample volume/g total volume of solution/mL volumetric dispensing/mL supplemented with nitric acid (3.1) Volume/mL 0.0050 to 0.010 10.00 2.00 50 - > 0.010 to 0.050 1.00 5.00 50 1 > 0.050 - 0.20 0.50 5.00 100 2

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