CJ/T 105-1999 Determination of total potassium in municipal solid waste - Flame photometry

Municipal solid waste refers to solid waste generated in daily urban life or in activities that provide services for urban life, as well as solid waste that is deemed as municipal solid waste by laws and administrative regulations. my country's environmental sanitation industry started late, and there is a blank in the monitoring method of lead in municipal solid waste. The detection method of this standard is based on GB 9836-1988 "Determination of Total Potassium in Soil". Due to the different compositions and characteristics of soil and municipal solid waste, this standard is specially formulated to standardize the monitoring method of potassium in municipal solid waste. This standard explains and stipulates the principle, instruments and equipment, and determination steps for the determination of total potassium in municipal solid waste. This standard is applicable to the determination of the total potassium content in municipal solid waste with a determination concentration range of 0.5%~1.5%. CJ/T 105-1999 Determination of Total Potassium in Municipal Solid Waste by Flame Photometry CJ/T105-1999 Standard download decompression password: www.bzxz.net

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City Construction Industry Standard of the People's Republic of China CJ/T105—1999
Municipal domestic refuse
Determination of total potassium
Flame spectrophotometric method
Municipal domestic refuse-Determination of total potassium Flame spectrophotometric method Construction Standard
1999-11-24 Issued
2000-06-01 Implementation
Issued by the Ministry of Construction of the People's Republic of China
Engineering Construction Standard Full Text Information System
Engineering Construction Standard Full Text Information System
CJ/T105—1999
Municipal domestic refuse refers to the solid waste generated in the daily life of the city or in the activities that provide services for the city life, as well as the solid waste that is regarded as urban domestic waste according to laws and administrative regulations. my country's environmental sanitation industry started late, and the detection method of potassium in urban domestic waste is a blank. The detection method of this standard is based on GB98361988 "Soil Total Potassium Determination Method". Due to the different compositions and characteristics of soil and urban domestic waste, this standard is formulated to standardize the detection method of potassium in urban domestic waste.
This standard is proposed by the Standard and Quota Research Institute of the Ministry of Construction. This standard is under the jurisdiction of the Shanghai Municipal Environmental Sanitation Administration, the technical specification unit of the Ministry of Construction's urban environmental sanitation standards.
This standard is drafted by the Tianjin Environmental Sanitation Engineering Design Institute. The main drafters of this standard are: Zhao Zangshan and Zhang Fan. This standard is entrusted to the Tianjin Environmental Sanitation Engineering Design Institute for interpretation. Engineering Construction Standard Full-text Information System
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Town Construction Industry Standard of the People's Republic of China Municipal Domestic Refuse
Determination of total potassium
Flame photometry
Municipal domestic refuseDetermination of total potassiumFlamespectrophotometricmethod1Scope
CJ/T105—1999
This standard explains and specifies the principle, instruments and equipment, and measurement steps for the determination of total potassium in municipal domestic refuse.
This standard is applicable to the determination of total potassium content in municipal domestic waste. The determination concentration range is 0.5%~1.5%.
Cited Standards
The provisions contained in the following standards constitute the provisions of this standard through reference in this standard. When this standard is published, the versions shown are valid. All standards will be revised, and parties using this standard should explore the possibility of using the latest version of the following standards. CJ/T3039—1995 Sampling and physical analysis methods of municipal solid waste Sample collection and preparation
The collection and preparation of municipal solid waste samples, determination of moisture content and storage of samples shall be carried out in accordance with the provisions of CJ/T3039.
Approved by the Ministry of Construction of the People's Republic of China on November 24, 1999 Engineering Construction Standard Full Text Information System
Implementation on June 1, 2000
Engineering Construction Standard Full Text Information System
4 Principle
Organic matter and various minerals in the garbage are oxidized and decomposed under the action of high temperature (720℃) and molten sodium hydroxide flux. The burning product is dissolved with acid to convert potassium into potassium ions, which can be directly measured by flame photometer after appropriate dilution. 5 Reagents
Unless otherwise specified, the reagents used in this standard should use analytical reagents and distilled water or water of equivalent purity that meet national standards or professional standards. 5.1 Anhydrous ethanol (CHCH,OH).
Sodium hydroxide (NaOH), high-grade purity.
5.3 Hydrochloric acid (HC), 1+1 (v/V).
5.4 0.2 mol/L sulfuric acid (H2SO4) solution. 5.5 Sulfuric acid (H2SO4) solution, 1+3 (V/V). 5.6
Potassium standard stock solution: Accurately weigh 0.1907 g of potassium chloride (K) dried at 110°C for 2 hours, dissolve it in water and make up to 1 L, shake well and store it in a plastic bottle. This solution contains 100 mg of potassium in 1 L.
a) 30 mL silver crucible or nickel crucible;
b) Muffle furnace;
c) Flame photometer.
Operation steps
Drawing of potassium standard curve
Take 5 50mL volumetric flasks, add 0.00, 0.50, 1.00, 2.00, 4.00mL of potassium standard stock solution (5.6) respectively, add other ion components in the same amount as the test solution, so that the ion components in the standard solution are similar to those in the test solution [then when preparing the standard series solution 2
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You should add 0.2g of sodium hydroxide (5.2) respectively, and then add 0.5mL of (1+3) sulfuric acid (5.5), and dilute to 50mL with water. This series of solutions are 0.00, 1.00, 2.00, 4.00, 8.00mg/L respectively. Use a solution with a potassium concentration of zero to adjust the instrument zero point, and measure according to the instrument operation procedure to draw a standard curve. 7.2 Preparation of test solution
Weigh about 0.25 g of sample (accurate to 0.0001 g) at the bottom of a nickel crucible, add a small amount of anhydrous ethanol (5.1) to moisten the sample, then add 2 g of solid sodium hydroxide (5.2) and spread it on the surface of the sample. Place it in a high-temperature electric furnace and start heating. When the furnace temperature rises to 400°C, turn off the power for 15 minutes. To prevent the contents of the crucible from overflowing, continue to heat to 720℃ and maintain for 15 minutes. Turn off the electric furnace and wait until the furnace temperature drops below 400℃. Take out the crucible and let it cool. Add 10mL of water and heat to about 80℃. Stir gently with a small glass rod to prevent the solution from splashing. Boil for another 5 minutes. After cooling, transfer to a 50mL volumetric flask. Wash the ground several times with a small amount of 0.2mol/L sulfuric acid solution (5.4), pour it into the volumetric flask together to make the total volume about 40mL. Then add 5 drops of (1+1) hydrochloric acid (5.3) and 5mL of (1+3) sulfuric acid (5.5), make up to volume with water, place it to clarify and test, and perform a blank experiment at the same time. 7.3 Determination
Pipette 5.00mL (or appropriate amount) of the test solution into a 50mL volumetric flask, dilute to the mark with water, shake well and measure with a flame photometer. Find the potassium concentration of the test solution from the standard curve.
8 Expression of analysis results
The percentage of total potassium c in garbage is expressed by the following formula: Vi
c= m××m×10www.bzxz.net
Wherein: m—potassium concentration in the test solution obtained from the standard curve, mg/L; V—digestion solution fixed volume, mL,
Vz—digestion solution absorption amount, mL,
Vs—test solution fixed volume, mL,
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msample—sample weight, g
Precision and accuracy
Two samples were measured, and four parallel samples were made for each sample. A total of three batches of experiments were carried out. The content was 1.324%~1.248%, and the relative standard deviation was 0.64%~1.08%. When 2.0~2.5mg of standard potassium is added to 0.25g of sample, the recovery rate ranges from 90.0% to 105.0%.
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